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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "VRFConsumerBase.sol";
import "TerminusFacet.sol";
import "ERC20Burnable.sol";
import "IERC721.sol";
import "IERC721Receiver.sol";
import "Ownable.sol";
import "ReentrancyGuard.sol";
import "IStatsFacet.sol";

contract DarkForest is
    Ownable,
    IERC721Receiver,
    VRFConsumerBase,
    ReentrancyGuard
{
    struct Sacrifice {
        // Statuses:
        // 1 -> offered
        // 2 -> randomness fulfilled
        // 3 -> completed
        uint32 status;
        address sacrificer;
        // threshold is an index into UnicornMilkThresholds - determined when the sacrifice is offered
        uint256 threshold;
        uint256 randomness;
    }

    address CryptoUnicornsAddress;
    address UnicornMilkTokenAddress;
    address TerminusAddress;
    uint256 UnicornMilkStakingReward;
    uint256 StakePeriodSeconds;
    mapping(uint256 => address) Staker;
    mapping(uint256 => uint256) UnstakesAt;
    mapping(address => uint256[]) TokensStaked;
    mapping(uint256 => uint256) StakedTokenIndexInStakerArray;
    uint256[3] UnicornMilkThresholds;
    uint256[3] ShadowcornPoolIds;
    uint256[3] LootboxPoolIds;
    uint256 ChainlinkVRFFee;
    bytes32 ChainlinkVRFKeyhash;
    uint256[3] ShadowcornEggBonusesToUnicornMilk;
    mapping(bytes32 => Sacrifice) ActiveSacrifices;
    mapping(address => bytes32) CurrentSacrificeForSacrificer;

    event EnteredForest(uint256 indexed tokenId, address indexed staker);
    event ExitedForest(
        uint256 indexed tokenId,
        address indexed staker,
        uint256 reward
    );
    event SacrificeOffered(address indexed sacrificer, uint256 amount);
    event SacrificeCompleted(
        address indexed sacrificer,
        uint256 indexed terminusPoolId,
        bytes32 requestId
    );

    constructor(
        address _CryptoUnicornsAddress,
        address _UnicornMilkTokenAddress,
        address _TerminusAddress,
        uint256 _UnicornMilkStakingReward,
        uint256 _StakePeriodSeconds,
        address _VRFCoordinatorAddress,
        address _LinkTokenAddress,
        uint256 _ChainlinkVRFFee,
        bytes32 _ChainlinkVRFKeyhash
    ) VRFConsumerBase(_VRFCoordinatorAddress, _LinkTokenAddress) {
        transferOwnership(_msgSender());
        CryptoUnicornsAddress = _CryptoUnicornsAddress;
        UnicornMilkTokenAddress = _UnicornMilkTokenAddress;
        TerminusAddress = _TerminusAddress;
        UnicornMilkStakingReward = _UnicornMilkStakingReward;
        StakePeriodSeconds = _StakePeriodSeconds;
        ChainlinkVRFFee = _ChainlinkVRFFee;
        ChainlinkVRFKeyhash = _ChainlinkVRFKeyhash;
    }

    function setCryptoUnicornsAddress(address _CryptoUnicornsAddress)
        external
        onlyOwner
    {
        CryptoUnicornsAddress = _CryptoUnicornsAddress;
    }

    function cryptoUnicornsAddress() external view returns (address) {
        return CryptoUnicornsAddress;
    }

    function setUnicornMilkTokenAddress(address _UnicornMilkTokenAddress)
        external
        onlyOwner
    {
        UnicornMilkTokenAddress = _UnicornMilkTokenAddress;
    }

    function unicornMilkTokenAddress() external view returns (address) {
        return UnicornMilkTokenAddress;
    }

    function setTerminusAddress(address _TerminusAddress) external onlyOwner {
        TerminusAddress = _TerminusAddress;
    }

    function terminusAddress() external view returns (address) {
        return TerminusAddress;
    }

    function setUnicornMilkStakingReward(uint256 _UnicornMilkStakingReward)
        external
        onlyOwner
    {
        UnicornMilkStakingReward = _UnicornMilkStakingReward;
    }

    function unicornMilkStakingReward() external view returns (uint256) {
        return UnicornMilkStakingReward;
    }

    function setStakePeriodSeconds(uint256 _StakePeriodSeconds)
        external
        onlyOwner
    {
        StakePeriodSeconds = _StakePeriodSeconds;
    }

    function stakePeriodSeconds() external view returns (uint256) {
        return StakePeriodSeconds;
    }

    function setUnicornMilkThresholds(uint256[3] memory _UnicornMilkThresholds)
        external
        onlyOwner
    {
        UnicornMilkThresholds = _UnicornMilkThresholds;
    }

    function unicornMilkThresholds() external view returns (uint256[3] memory) {
        return UnicornMilkThresholds;
    }

    function setShadowcornPoolIds(uint256[3] memory _ShadowcornPoolIds)
        external
        onlyOwner
    {
        ShadowcornPoolIds = _ShadowcornPoolIds;
    }

    function shadowcornPoolIds() external view returns (uint256[3] memory) {
        return ShadowcornPoolIds;
    }

    function setLootboxPoolIds(uint256[3] memory _LootboxPoolIds)
        external
        onlyOwner
    {
        LootboxPoolIds = _LootboxPoolIds;
    }

    function lootboxPoolIds() external view returns (uint256[3] memory) {
        return LootboxPoolIds;
    }

    function setShadowcornEggBonusesToUnicornMilk(uint256[3] memory _bonuses)
        external
        onlyOwner
    {
        ShadowcornEggBonusesToUnicornMilk = _bonuses;
    }

    function shadowcornEggBonusesToUnicornMilk()
        external
        view
        returns (uint256[3] memory)
    {
        return ShadowcornEggBonusesToUnicornMilk;
    }

    function contractIsInitialized() public view returns (bool) {
        return
            UnicornMilkThresholds[0] > 0 &&
            ShadowcornPoolIds[0] > 0 &&
            LootboxPoolIds[0] > 0;
    }

    // This function surrenders control of Terminus pools back to the contract owner. This is so that,
    // in case this contract is deprecated, the owner can still perform operations on the shadowcorn
    // eggs and lootboxes.
    function surrenderTerminusPools() external onlyOwner {
        address _owner = owner();
        TerminusFacet terminusContract = TerminusFacet(TerminusAddress);
        for (uint256 i = 0; i < 3; i++) {
            terminusContract.setPoolController(ShadowcornPoolIds[i], _owner);
            terminusContract.setPoolController(LootboxPoolIds[i], _owner);
        }
    }

    function numStaked(address _staker) public view returns (uint256) {
        return TokensStaked[_staker].length;
    }

    function tokenOfStakerByIndex(address _staker, uint256 index)
        public
        view
        returns (uint256)
    {
        require(
            index < numStaked(_staker),
            "DarkForest: tokenOfStakerByIndex -- staker index out of bounds"
        );
        return TokensStaked[_staker][index];
    }

    function _addTokenToStakerEnumeration(address _staker, uint256 _tokenId)
        private
    {
        uint256 numPreviouslyStaked = numStaked(_staker);
        TokensStaked[_staker].push(_tokenId);
        StakedTokenIndexInStakerArray[_tokenId] = numPreviouslyStaked;
    }

    function _removeTokenFromStakerEnumeration(
        address _staker,
        uint256 _tokenId
    ) private {
        // Swap to last index (if necessary), then pop.
        uint256 lastIndex = numStaked(_staker) - 1;
        uint256 tokenIndex = StakedTokenIndexInStakerArray[_tokenId];
        require(
            TokensStaked[_staker][tokenIndex] == _tokenId,
            "DarkForest: _removeTokenFromStakerEnumeration -- token was not found where expected in TokensStaked array"
        );
        if (tokenIndex != lastIndex) {
            uint256 lastId = TokensStaked[_staker][lastIndex];
            TokensStaked[_staker][tokenIndex] = lastId;
            StakedTokenIndexInStakerArray[lastId] = tokenIndex;
        }

        TokensStaked[_staker].pop();
        delete StakedTokenIndexInStakerArray[_tokenId];
    }

    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4) {
        require(
            _msgSender() == CryptoUnicornsAddress,
            "DarkForest: onERC721Received -- Only Crypto Unicorns may enter the Dark Forest (nice try, my friend)"
        );
        IStatsFacet CUContract = IStatsFacet(CryptoUnicornsAddress);
        (, bool gameLocked, , uint256 lifecycleStage, , , ) = CUContract
            .getUnicornMetadata(tokenId);
        require(
            !gameLocked,
            "DarkForest: onERC721Received -- Cannot enter the Dark Forest while the Crypto Unicorns game has locked your token"
        );
        require(
            lifecycleStage == 2,
            "DarkForest: onERC721Received -- Only adult unicorns can enter the dark forest"
        );
        Staker[tokenId] = from;
        UnstakesAt[tokenId] = block.timestamp + StakePeriodSeconds;
        _addTokenToStakerEnumeration(from, tokenId);
        emit EnteredForest(tokenId, from);
        return IERC721Receiver.onERC721Received.selector;
    }

    function exitForest(uint256 tokenId)
        external
        nonReentrant
        returns (uint256)
    {
        require(
            _msgSender() == Staker[tokenId],
            "DarkForest: exitForest -- only the address which staked the token can make it exit the dark forest"
        );
        require(
            block.timestamp >= UnstakesAt[tokenId],
            "DarkForest: exitForest -- unicorn cannot find the exit yet"
        );
        IERC721(CryptoUnicornsAddress).safeTransferFrom(
            address(this),
            _msgSender(),
            tokenId
        );
        ERC20Burnable unimContract = ERC20Burnable(UnicornMilkTokenAddress);
        uint256 darkForestUnicornMilkBalance = unimContract.balanceOf(
            address(this)
        );
        uint256 reward = UnicornMilkStakingReward;
        TerminusFacet terminusContract = TerminusFacet(TerminusAddress);
        for (uint256 i = 0; i < 3; i++) {
            reward += (ShadowcornEggBonusesToUnicornMilk[i] *
                terminusContract.balanceOf(_msgSender(), ShadowcornPoolIds[i]));
        }
        if (darkForestUnicornMilkBalance < reward) {
            reward = UnicornMilkStakingReward;
        }
        if (darkForestUnicornMilkBalance >= reward) {
            unimContract.transfer(_msgSender(), reward);
        } else {
            reward = 0;
        }
        _removeTokenFromStakerEnumeration(_msgSender(), tokenId);
        Staker[tokenId] = address(0);
        UnstakesAt[tokenId] = 0;
        emit ExitedForest(tokenId, _msgSender(), reward);
        return reward;
    }

    function remainingShadowcornEggs()
        public
        view
        returns (uint256[3] memory, uint256)
    {
        TerminusFacet terminusContract = TerminusFacet(TerminusAddress);

        uint256[3] memory remainingShadowcornEggsByType;
        uint256 totalRemainingShadowcornEggs;
        for (uint256 i = 0; i < 3; i++) {
            uint256 availableCapacity = terminusContract.terminusPoolCapacity(
                ShadowcornPoolIds[i]
            ) - terminusContract.terminusPoolSupply(ShadowcornPoolIds[i]);
            totalRemainingShadowcornEggs += availableCapacity;
            remainingShadowcornEggsByType[i] = availableCapacity;
        }

        return (remainingShadowcornEggsByType, totalRemainingShadowcornEggs);
    }

    function offerSacrifice(uint256 amount) external nonReentrant {
        require(
            contractIsInitialized(),
            "DarkForest: offerSacrifice -- The altar is in ruins"
        );
        require(
            CurrentSacrificeForSacrificer[_msgSender()] == 0,
            "DarkForest: offerSacrifice -- Sender already has a sacrifice in progress"
        );

        uint256 totalRemainingShadowcornEggs;
        (, totalRemainingShadowcornEggs) = remainingShadowcornEggs();
        require(
            totalRemainingShadowcornEggs > 0,
            "DarkForest: offerSacrifice -- The altar seems lifeless and without energy"
        );

        emit SacrificeOffered(_msgSender(), amount);

        ERC20Burnable unimContract = ERC20Burnable(UnicornMilkTokenAddress);

        // Determine how generous of a sacrifice the caller is making. This is stored in the threshold
        // variable. 0 means low, 1 means medium, 2 means high.
        require(
            amount >= UnicornMilkThresholds[0],
            "DarkForest: offerSacrifice -- The altar rejects your paltry sacrifice"
        );
        uint256 threshold = 0;
        if (amount >= UnicornMilkThresholds[2]) {
            threshold = 2;
        } else if (amount >= UnicornMilkThresholds[1]) {
            threshold = 1;
        }
        uint256 sacrificeAmount = UnicornMilkThresholds[threshold];
        require(
            unimContract.allowance(_msgSender(), address(this)) >=
                sacrificeAmount,
            "DarkForest: offerSacrifice -- Insufficient allowance on Unicorm Milk token"
        );
        unimContract.burnFrom(_msgSender(), sacrificeAmount);

        Sacrifice memory currentSacrifice;
        currentSacrifice.status = 1;
        currentSacrifice.sacrificer = _msgSender();
        currentSacrifice.threshold = threshold;

        bytes32 requestId = requestRandomness(
            ChainlinkVRFKeyhash,
            ChainlinkVRFFee
        );
        ActiveSacrifices[requestId] = currentSacrifice;
        CurrentSacrificeForSacrificer[_msgSender()] = requestId;
    }

    function fulfillRandomness(bytes32 requestId, uint256 randomness)
        internal
        override
    {
        Sacrifice storage currentSacrifice = ActiveSacrifices[requestId];
        if (currentSacrifice.status != 1) {
            return;
        }
        currentSacrifice.status = 2;
        currentSacrifice.randomness = randomness;
    }

    function completeSacrifice() external nonReentrant {
        bytes32 requestId = CurrentSacrificeForSacrificer[_msgSender()];
        require(
            requestId != 0,
            "DarkForest: completeSacrifice -- Sender has no sacrifice in progress"
        );
        Sacrifice storage currentSacrifice = ActiveSacrifices[requestId];

        TerminusFacet terminusContract = TerminusFacet(TerminusAddress);

        uint256[3] memory remainingShadowcornEggsByType;
        uint256 totalRemainingShadowcornEggs;

        (
            remainingShadowcornEggsByType,
            totalRemainingShadowcornEggs
        ) = remainingShadowcornEggs();

        uint256 terminusPoolId = 0;
        if (totalRemainingShadowcornEggs > 0) {
            require(
                currentSacrifice.status == 2,
                "DarkForest: completeSacrifice -- Ritual cannot be completed at this time"
            );

            // The following extraction of randomness assumes maximal entropy (256 bits worth) in the random number returned by
            // Chainlink VRF. This was confirmed by Max Melcher from Chainlink.
            // There will be a slight bias introduced by how we use this randomness.
            // The first random number we are selecting is being selected modulo 100, which has factors prime to 2.
            // The second random number will be reduced modulo the number of remaining shadowcorn eggs, which may or may not be a power of 2.
            // Either way, the bias will be very small because 2^(256-m)/N is very large for m = 0, N = 100 or m = 7, N = number of remaining shadowcorn eggs.
            // The bias amounts to a difference between probabilities of outcomes closer to 0 compared to those of outcomes closer to N and is
            // 1/[floor(2^(256-m)/N)*(floor(2^(256-m)/N) + 1)].
            // Even at the largest number of available shadowcorn eggs (3000), this bias is a difference in probabilities of: 1.0997770908598577e-143
            uint256 initialRandomness = currentSacrifice.randomness % 100;
            uint256 secondaryRandomness = currentSacrifice.randomness >> 7;

            terminusPoolId = LootboxPoolIds[currentSacrifice.threshold];
            bool selectShadowcornEgg = (currentSacrifice.threshold == 0 &&
                initialRandomness < 10) ||
                (currentSacrifice.threshold == 1 && initialRandomness < 50) ||
                (currentSacrifice.threshold == 2);
            if (selectShadowcornEgg) {
                uint256 eggNumber = secondaryRandomness %
                    totalRemainingShadowcornEggs;
                if (eggNumber < remainingShadowcornEggsByType[0]) {
                    terminusPoolId = ShadowcornPoolIds[0];
                } else if (
                    eggNumber <
                    remainingShadowcornEggsByType[0] +
                        remainingShadowcornEggsByType[1]
                ) {
                    terminusPoolId = ShadowcornPoolIds[1];
                } else {
                    terminusPoolId = ShadowcornPoolIds[2];
                }
            }
            if (terminusPoolId > 0) {
                terminusContract.mint(_msgSender(), terminusPoolId, 1, "");
            }
        }
        currentSacrifice.status = 3;
        delete CurrentSacrificeForSacrificer[_msgSender()];
        emit SacrificeCompleted(_msgSender(), terminusPoolId, requestId);
    }

    function staker(uint256 tokenId) external view returns (address) {
        return Staker[tokenId];
    }

    function unstakesAt(uint256 tokenId) external view returns (uint256) {
        return UnstakesAt[tokenId];
    }

    function setChainlinkVRFFee(uint256 _fee) external onlyOwner {
        ChainlinkVRFFee = _fee;
    }

    function chainlinkVRFFee() external view returns (uint256) {
        return ChainlinkVRFFee;
    }

    function setChainlinkVRFKeyhash(bytes32 _keyhash) external onlyOwner {
        ChainlinkVRFKeyhash = _keyhash;
    }

    function chainlinkVRFKeyhash() external view returns (bytes32) {
        return ChainlinkVRFKeyhash;
    }

    function viewSacrifice(bytes32 _requestId)
        external
        view
        returns (Sacrifice memory)
    {
        Sacrifice memory requestedSacrifice = ActiveSacrifices[_requestId];
        return requestedSacrifice;
    }

    function currentSacrificeId(address sacrificer)
        external
        view
        returns (bytes32)
    {
        return CurrentSacrificeForSacrificer[sacrificer];
    }

    function withdrawERC20(address tokenAddress, uint256 amount)
        external
        onlyOwner
    {
        ERC20Burnable erc20Contract = ERC20Burnable(tokenAddress);
        erc20Contract.transfer(_msgSender(), amount);
    }

    function drainERC20(address tokenAddress) external onlyOwner {
        ERC20Burnable erc20Contract = ERC20Burnable(tokenAddress);
        uint256 darkForestUnicornMilkBalance = erc20Contract.balanceOf(
            address(this)
        );
        erc20Contract.transfer(_msgSender(), darkForestUnicornMilkBalance);
    }

    function rescueUnicorn(uint256 tokenId) external onlyOwner {
        IERC721 cryptoUnicornsContract = IERC721(CryptoUnicornsAddress);
        require(
            cryptoUnicornsContract.ownerOf(tokenId) == address(this),
            "DarkForest: recoverUnicorn -- That unicorn is not in the Dark Forest"
        );
        address _staker = Staker[tokenId];
        _removeTokenFromStakerEnumeration(_staker, tokenId);
        delete Staker[tokenId];
        delete UnstakesAt[tokenId];
        IERC721(CryptoUnicornsAddress).transferFrom(
            address(this),
            _msgSender(),
            tokenId
        );
    }

    function resetSacrificeForSacrificer(address sacrificer)
        external
        onlyOwner
    {
        delete CurrentSacrificeForSacrificer[sacrificer];
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "LinkTokenInterface.sol";

import "VRFRequestIDBase.sol";

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.)
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBase expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomness the VRF output
   */
  function fulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    internal
    virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 constant private USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(
    bytes32 _keyHash,
    uint256 _fee
  )
    internal
    returns (
      bytes32 requestId
    )
  {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed  = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface immutable internal LINK;
  address immutable private vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(
    address _vrfCoordinator,
    address _link
  ) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    external
  {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface LinkTokenInterface {

  function allowance(
    address owner,
    address spender
  )
    external
    view
    returns (
      uint256 remaining
    );

  function approve(
    address spender,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function balanceOf(
    address owner
  )
    external
    view
    returns (
      uint256 balance
    );

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

  function transfer(
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract VRFRequestIDBase {

  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  )
    internal
    pure
    returns (
      uint256
    )
  {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(
    bytes32 _keyHash,
    uint256 _vRFInputSeed
  )
    internal
    pure
    returns (
      bytes32
    )
  {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}

// SPDX-License-Identifier: Apache-2.0

/**
 * Authors: Moonstream Engineering ([email protected])
 * GitHub: https://github.com/bugout-dev/dao
 *
 * This is an implementation of the Terminus decentralized authorization contract.
 *
 * Terminus users can create authorization pools. Each authorization pool has the following properties:
 * 1. Controller: The address that controls the pool. Initially set to be the address of the pool creator.
 * 2. Pool URI: Metadata URI for the authorization pool.
 * 3. Pool capacity: The total number of tokens that can be minted in that authorization pool.
 * 4. Pool supply: The number of tokens that have actually been minted in that authorization pool.
 * 5. Transferable: A boolean value which denotes whether or not tokens from that pool can be transfered
 *    between addresses. (Note: Implemented by TerminusStorage.poolNotTransferable since we expect most
 *    pools to be transferable. This negation is better for storage + gas since false is default value
 *    in map to bool.)
 * 6. Burnable: A boolean value which denotes whether or not tokens from that pool can be burned.
 */

pragma solidity ^0.8.0;

import "IERC20.sol";
import "ERC1155WithTerminusStorage.sol";
import "LibTerminus.sol";
import "LibDiamond.sol";

contract TerminusFacet is ERC1155WithTerminusStorage {
    constructor() {
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.controller = msg.sender;
    }

    event PoolMintBatch(
        uint256 indexed id,
        address indexed operator,
        address from,
        address[] toAddresses,
        uint256[] amounts
    );

    function poolMintBatch(
        uint256 id,
        address[] memory toAddresses,
        uint256[] memory amounts
    ) public {
        address operator = _msgSender();
        LibTerminus.enforcePoolIsController(id, operator);
        require(
            toAddresses.length == amounts.length,
            "TerminusFacet: _poolMintBatch -- toAddresses and amounts length mismatch"
        );

        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();

        uint256 i = 0;
        uint256 totalAmount = 0;

        for (i = 0; i < toAddresses.length; i++) {
            address to = toAddresses[i];
            uint256 amount = amounts[i];
            require(
                to != address(0),
                "TerminusFacet: _poolMintBatch -- cannot mint to zero address"
            );
            totalAmount += amount;
            ts.poolBalances[id][to] += amount;
            emit TransferSingle(operator, address(0), to, id, amount);
        }

        require(
            ts.poolSupply[id] + totalAmount <= ts.poolCapacity[id],
            "TerminusFacet: _poolMintBatch -- Minted tokens would exceed pool capacity"
        );
        ts.poolSupply[id] += totalAmount;

        emit PoolMintBatch(id, operator, address(0), toAddresses, amounts);
    }

    function terminusController() external view returns (address) {
        return LibTerminus.terminusStorage().controller;
    }

    function paymentToken() external view returns (address) {
        return LibTerminus.terminusStorage().paymentToken;
    }

    function setPaymentToken(address newPaymentToken) external {
        LibTerminus.enforceIsController();
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.paymentToken = newPaymentToken;
    }

    function poolBasePrice() external view returns (uint256) {
        return LibTerminus.terminusStorage().poolBasePrice;
    }

    function setPoolBasePrice(uint256 newBasePrice) external {
        LibTerminus.enforceIsController();
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.poolBasePrice = newBasePrice;
    }

    function _paymentTokenContract() internal view returns (IERC20) {
        address paymentTokenAddress = LibTerminus
            .terminusStorage()
            .paymentToken;
        require(
            paymentTokenAddress != address(0),
            "TerminusFacet: Payment token has not been set"
        );
        return IERC20(paymentTokenAddress);
    }

    function withdrawPayments(address toAddress, uint256 amount) external {
        LibTerminus.enforceIsController();
        require(
            _msgSender() == toAddress,
            "TerminusFacet: withdrawPayments -- Controller can only withdraw to self"
        );
        IERC20 paymentTokenContract = _paymentTokenContract();
        paymentTokenContract.transfer(toAddress, amount);
    }

    function setURI(uint256 poolID, string memory poolURI) external {
        LibTerminus.enforcePoolIsController(poolID, _msgSender());
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.poolURI[poolID] = poolURI;
    }

    function totalPools() external view returns (uint256) {
        return LibTerminus.terminusStorage().currentPoolID;
    }

    function setPoolController(uint256 poolID, address newController) external {
        LibTerminus.enforcePoolIsController(poolID, msg.sender);
        LibTerminus.setPoolController(poolID, newController);
    }

    function terminusPoolController(uint256 poolID)
        external
        view
        returns (address)
    {
        return LibTerminus.terminusStorage().poolController[poolID];
    }

    function terminusPoolCapacity(uint256 poolID)
        external
        view
        returns (uint256)
    {
        return LibTerminus.terminusStorage().poolCapacity[poolID];
    }

    function terminusPoolSupply(uint256 poolID)
        external
        view
        returns (uint256)
    {
        return LibTerminus.terminusStorage().poolSupply[poolID];
    }

    function createSimplePool(uint256 _capacity) external returns (uint256) {
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        uint256 requiredPayment = ts.poolBasePrice;
        IERC20 paymentTokenContract = _paymentTokenContract();
        require(
            paymentTokenContract.allowance(_msgSender(), address(this)) >=
                requiredPayment,
            "TerminusFacet: createSimplePool -- Insufficient allowance on payment token"
        );
        paymentTokenContract.transferFrom(
            msg.sender,
            address(this),
            requiredPayment
        );
        return LibTerminus.createSimplePool(_capacity);
    }

    function createPoolV1(
        uint256 _capacity,
        bool _transferable,
        bool _burnable
    ) external returns (uint256) {
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        // TODO(zomglings): Implement requiredPayment update based on pool features.
        uint256 requiredPayment = ts.poolBasePrice;
        IERC20 paymentTokenContract = _paymentTokenContract();
        require(
            paymentTokenContract.allowance(_msgSender(), address(this)) >=
                requiredPayment,
            "TerminusFacet: createPoolV1 -- Insufficient allowance on payment token"
        );
        paymentTokenContract.transferFrom(
            msg.sender,
            address(this),
            requiredPayment
        );
        uint256 poolID = LibTerminus.createSimplePool(_capacity);
        if (!_transferable) {
            ts.poolNotTransferable[poolID] = true;
        }
        if (_burnable) {
            ts.poolBurnable[poolID] = true;
        }
        return poolID;
    }

    function mint(
        address to,
        uint256 poolID,
        uint256 amount,
        bytes memory data
    ) external {
        LibTerminus.enforcePoolIsController(poolID, msg.sender);
        _mint(to, poolID, amount, data);
    }

    function mintBatch(
        address to,
        uint256[] memory poolIDs,
        uint256[] memory amounts,
        bytes memory data
    ) external {
        for (uint256 i = 0; i < poolIDs.length; i++) {
            LibTerminus.enforcePoolIsController(poolIDs[i], _msgSender());
        }
        _mintBatch(to, poolIDs, amounts, data);
    }

    function burn(
        address from,
        uint256 poolID,
        uint256 amount
    ) external {
        address operator = _msgSender();
        require(
            operator == from || isApprovedForPool(poolID, operator),
            "TerminusFacet: burn -- caller is neither owner nor approved"
        );
        _burn(from, poolID, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: Apache-2.0

/**
 * Authors: Moonstream Engineering ([email protected])
 * GitHub: https://github.com/bugout-dev/dao
 *
 * An ERC1155 implementation which uses the Moonstream DAO common storage structure for proxies.
 * EIP1155: https://eips.ethereum.org/EIPS/eip-1155
 *
 * The Moonstream contract is used to delegate calls from an EIP2535 Diamond proxy.
 *
 * This implementation is adapted from the OpenZeppelin ERC1155 implementation:
 * https://github.com/OpenZeppelin/openzeppelin-contracts/tree/6bd6b76d1156e20e45d1016f355d154141c7e5b9/contracts/token/ERC1155
 */

pragma solidity ^0.8.9;

import "IERC1155.sol";
import "IERC1155Receiver.sol";
import "IERC1155MetadataURI.sol";
import "Address.sol";
import "Context.sol";
import "ERC165.sol";
import "LibTerminus.sol";

contract ERC1155WithTerminusStorage is
    Context,
    ERC165,
    IERC1155,
    IERC1155MetadataURI
{
    using Address for address;

    constructor() {}

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC165, IERC165)
        returns (bool)
    {
        return
            interfaceId == type(IERC1155).interfaceId ||
            interfaceId == type(IERC1155MetadataURI).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    function uri(uint256 poolID)
        public
        view
        virtual
        override
        returns (string memory)
    {
        return LibTerminus.terminusStorage().poolURI[poolID];
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id)
        public
        view
        virtual
        override
        returns (uint256)
    {
        require(
            account != address(0),
            "ERC1155WithTerminusStorage: balance query for the zero address"
        );
        return LibTerminus.terminusStorage().poolBalances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(
            accounts.length == ids.length,
            "ERC1155WithTerminusStorage: accounts and ids length mismatch"
        );

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved)
        public
        virtual
        override
    {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            LibTerminus.terminusStorage().globalOperatorApprovals[account][
                operator
            ];
    }

    function isApprovedForPool(uint256 poolID, address operator)
        public
        view
        returns (bool)
    {
        return LibTerminus._isApprovedForPool(poolID, operator);
    }

    function approveForPool(uint256 poolID, address operator) external {
        LibTerminus.enforcePoolIsController(poolID, _msgSender());
        LibTerminus._approveForPool(poolID, operator);
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() ||
                isApprovedForAll(from, _msgSender()) ||
                isApprovedForPool(id, _msgSender()),
            "ERC1155WithTerminusStorage: caller is not owner nor approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155WithTerminusStorage: transfer caller is not owner nor approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(
            to != address(0),
            "ERC1155WithTerminusStorage: transfer to the zero address"
        );
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        require(
            !ts.poolNotTransferable[id],
            "ERC1155WithTerminusStorage: _safeTransferFrom -- pool is not transferable"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(
            operator,
            from,
            to,
            _asSingletonArray(id),
            _asSingletonArray(amount),
            data
        );

        uint256 fromBalance = ts.poolBalances[id][from];
        require(
            fromBalance >= amount,
            "ERC1155WithTerminusStorage: insufficient balance for transfer"
        );
        unchecked {
            ts.poolBalances[id][from] = fromBalance - amount;
        }
        ts.poolBalances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(
            ids.length == amounts.length,
            "ERC1155WithTerminusStorage: ids and amounts length mismatch"
        );
        require(
            to != address(0),
            "ERC1155WithTerminusStorage: transfer to the zero address"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = ts.poolBalances[id][from];
            require(
                fromBalance >= amount,
                "ERC1155WithTerminusStorage: insufficient balance for transfer"
            );
            unchecked {
                ts.poolBalances[id][from] = fromBalance - amount;
            }
            ts.poolBalances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(
            operator,
            from,
            to,
            ids,
            amounts,
            data
        );
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(
            to != address(0),
            "ERC1155WithTerminusStorage: mint to the zero address"
        );
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        require(
            ts.poolSupply[id] + amount <= ts.poolCapacity[id],
            "ERC1155WithTerminusStorage: _mint -- Minted tokens would exceed pool capacity"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(
            operator,
            address(0),
            to,
            _asSingletonArray(id),
            _asSingletonArray(amount),
            data
        );

        ts.poolSupply[id] += amount;
        ts.poolBalances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _doSafeTransferAcceptanceCheck(
            operator,
            address(0),
            to,
            id,
            amount,
            data
        );
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(
            to != address(0),
            "ERC1155WithTerminusStorage: mint to the zero address"
        );
        require(
            ids.length == amounts.length,
            "ERC1155WithTerminusStorage: ids and amounts length mismatch"
        );

        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();

        for (uint256 i = 0; i < ids.length; i++) {
            require(
                ts.poolSupply[ids[i]] + amounts[i] <= ts.poolCapacity[ids[i]],
                "ERC1155WithTerminusStorage: _mintBatch -- Minted tokens would exceed pool capacity"
            );
        }

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            ts.poolSupply[ids[i]] += amounts[i];
            ts.poolBalances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(
            operator,
            address(0),
            to,
            ids,
            amounts,
            data
        );
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(
            from != address(0),
            "ERC1155WithTerminusStorage: burn from the zero address"
        );
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        require(
            ts.poolBurnable[id],
            "ERC1155WithTerminusStorage: _burn -- pool is not burnable"
        );

        address operator = _msgSender();

        _beforeTokenTransfer(
            operator,
            from,
            address(0),
            _asSingletonArray(id),
            _asSingletonArray(amount),
            ""
        );

        uint256 fromBalance = ts.poolBalances[id][from];
        require(
            fromBalance >= amount,
            "ERC1155WithTerminusStorage: burn amount exceeds balance"
        );
        unchecked {
            ts.poolBalances[id][from] = fromBalance - amount;
            ts.poolSupply[id] -= amount;
        }

        emit TransferSingle(operator, from, address(0), id, amount);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(
            from != address(0),
            "ERC1155WithTerminusStorage: burn from the zero address"
        );
        require(
            ids.length == amounts.length,
            "ERC1155WithTerminusStorage: ids and amounts length mismatch"
        );

        address operator = _msgSender();

        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        for (uint256 i = 0; i < ids.length; i++) {
            require(
                ts.poolBurnable[ids[i]],
                "ERC1155WithTerminusStorage: _burnBatch -- pool is not burnable"
            );
        }

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = ts.poolBalances[id][from];
            require(
                fromBalance >= amount,
                "ERC1155WithTerminusStorage: burn amount exceeds balance"
            );
            unchecked {
                ts.poolBalances[id][from] = fromBalance - amount;
                ts.poolSupply[id] -= amount;
            }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(
            owner != operator,
            "ERC1155WithTerminusStorage: setting approval status for self"
        );
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.globalOperatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try
                IERC1155Receiver(to).onERC1155Received(
                    operator,
                    from,
                    id,
                    amount,
                    data
                )
            returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert(
                        "ERC1155WithTerminusStorage: ERC1155Receiver rejected tokens"
                    );
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert(
                    "ERC1155WithTerminusStorage: transfer to non ERC1155Receiver implementer"
                );
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try
                IERC1155Receiver(to).onERC1155BatchReceived(
                    operator,
                    from,
                    ids,
                    amounts,
                    data
                )
            returns (bytes4 response) {
                if (
                    response != IERC1155Receiver.onERC1155BatchReceived.selector
                ) {
                    revert(
                        "ERC1155WithTerminusStorage: ERC1155Receiver rejected tokens"
                    );
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert(
                    "ERC1155WithTerminusStorage: transfer to non ERC1155Receiver implementer"
                );
            }
        }
    }

    function _asSingletonArray(uint256 element)
        private
        pure
        returns (uint256[] memory)
    {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC1155.sol";

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: Apache-2.0

/**
 * Authors: Moonstream Engineering ([email protected])
 * GitHub: https://github.com/bugout-dev/dao
 *
 * Common storage structure and internal methods for Moonstream DAO Terminus contracts.
 * As Terminus is an extension of ERC1155, this library can also be used to implement bare ERC1155 contracts
 * using the common storage pattern (e.g. for use in diamond proxies).
 */

// TODO(zomglings): Should we support EIP1761 in addition to ERC1155 or roll our own scopes and feature flags?
// https://eips.ethereum.org/EIPS/eip-1761

pragma solidity ^0.8.9;

library LibTerminus {
    bytes32 constant TERMINUS_STORAGE_POSITION =
        keccak256("moonstreamdao.eth.storage.terminus");

    struct TerminusStorage {
        // Terminus administration
        address controller;
        bool isTerminusActive;
        uint256 currentPoolID;
        address paymentToken;
        uint256 poolBasePrice;
        // Terminus pools
        mapping(uint256 => address) poolController;
        mapping(uint256 => string) poolURI;
        mapping(uint256 => uint256) poolCapacity;
        mapping(uint256 => uint256) poolSupply;
        mapping(uint256 => mapping(address => uint256)) poolBalances;
        mapping(uint256 => bool) poolNotTransferable;
        mapping(uint256 => bool) poolBurnable;
        mapping(address => mapping(address => bool)) globalOperatorApprovals;
        mapping(uint256 => mapping(address => bool)) globalPoolOperatorApprovals;
    }

    function terminusStorage()
        internal
        pure
        returns (TerminusStorage storage es)
    {
        bytes32 position = TERMINUS_STORAGE_POSITION;
        assembly {
            es.slot := position
        }
    }

    event ControlTransferred(
        address indexed previousController,
        address indexed newController
    );

    event PoolControlTransferred(
        uint256 indexed poolID,
        address indexed previousController,
        address indexed newController
    );

    function setController(address newController) internal {
        TerminusStorage storage ts = terminusStorage();
        address previousController = ts.controller;
        ts.controller = newController;
        emit ControlTransferred(previousController, newController);
    }

    function enforceIsController() internal view {
        TerminusStorage storage ts = terminusStorage();
        require(msg.sender == ts.controller, "LibTerminus: Must be controller");
    }

    function setTerminusActive(bool active) internal {
        TerminusStorage storage ts = terminusStorage();
        ts.isTerminusActive = active;
    }

    function setPoolController(uint256 poolID, address newController) internal {
        TerminusStorage storage ts = terminusStorage();
        address previousController = ts.poolController[poolID];
        ts.poolController[poolID] = newController;
        emit PoolControlTransferred(poolID, previousController, newController);
    }

    function createSimplePool(uint256 _capacity) internal returns (uint256) {
        TerminusStorage storage ts = terminusStorage();
        uint256 poolID = ts.currentPoolID + 1;
        setPoolController(poolID, msg.sender);
        ts.poolCapacity[poolID] = _capacity;
        ts.currentPoolID++;
        return poolID;
    }

    function enforcePoolIsController(uint256 poolID, address maybeController)
        internal
        view
    {
        TerminusStorage storage ts = terminusStorage();
        require(
            ts.poolController[poolID] == maybeController,
            "LibTerminus: Must be pool controller"
        );
    }

    function _isApprovedForPool(uint256 poolID, address operator)
        internal
        view
        returns (bool)
    {
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        if (operator == ts.poolController[poolID]) {
            return true;
        } else if (ts.globalPoolOperatorApprovals[poolID][operator]) {
            return true;
        }
        return false;
    }

    function _approveForPool(uint256 poolID, address operator) internal {
        LibTerminus.TerminusStorage storage ts = LibTerminus.terminusStorage();
        ts.globalPoolOperatorApprovals[poolID][operator] = true;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Adapted from the Diamond 3 reference implementation by Nick Mudge:
// https://github.com/mudgen/diamond-3-hardhat

import { IDiamondCut } from "IDiamondCut.sol";

library LibDiamond {
    bytes32 constant DIAMOND_STORAGE_POSITION = keccak256("diamond.standard.diamond.storage");

    struct FacetAddressAndPosition {
        address facetAddress;
        uint96 functionSelectorPosition; // position in facetFunctionSelectors.functionSelectors array
    }

    struct FacetFunctionSelectors {
        bytes4[] functionSelectors;
        uint256 facetAddressPosition; // position of facetAddress in facetAddresses array
    }

    struct DiamondStorage {
        // maps function selector to the facet address and
        // the position of the selector in the facetFunctionSelectors.selectors array
        mapping(bytes4 => FacetAddressAndPosition) selectorToFacetAndPosition;
        // maps facet addresses to function selectors
        mapping(address => FacetFunctionSelectors) facetFunctionSelectors;
        // facet addresses
        address[] facetAddresses;
        // Used to query if a contract implements an interface.
        // Used to implement ERC-165.
        mapping(bytes4 => bool) supportedInterfaces;
        // owner of the contract
        address contractOwner;
    }

    function diamondStorage() internal pure returns (DiamondStorage storage ds) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function setContractOwner(address _newOwner) internal {
        DiamondStorage storage ds = diamondStorage();
        address previousOwner = ds.contractOwner;
        ds.contractOwner = _newOwner;
        emit OwnershipTransferred(previousOwner, _newOwner);
    }

    function contractOwner() internal view returns (address contractOwner_) {
        contractOwner_ = diamondStorage().contractOwner;
    }

    function enforceIsContractOwner() internal view {
        require(msg.sender == diamondStorage().contractOwner, "LibDiamond: Must be contract owner");
    }

    event DiamondCut(IDiamondCut.FacetCut[] _diamondCut, address _init, bytes _calldata);

    // Internal function version of diamondCut
    function diamondCut(
        IDiamondCut.FacetCut[] memory _diamondCut,
        address _init,
        bytes memory _calldata
    ) internal {
        for (uint256 facetIndex; facetIndex < _diamondCut.length; facetIndex++) {
            IDiamondCut.FacetCutAction action = _diamondCut[facetIndex].action;
            if (action == IDiamondCut.FacetCutAction.Add) {
                addFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Replace) {
                replaceFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else if (action == IDiamondCut.FacetCutAction.Remove) {
                removeFunctions(_diamondCut[facetIndex].facetAddress, _diamondCut[facetIndex].functionSelectors);
            } else {
                revert("LibDiamondCut: Incorrect FacetCutAction");
            }
        }
        emit DiamondCut(_diamondCut, _init, _calldata);
        initializeDiamondCut(_init, _calldata);
    }

    function addFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        require(_functionSelectors.length > 0, "LibDiamondCut: No selectors in facet to cut");
        DiamondStorage storage ds = diamondStorage();
        require(_facetAddress != address(0), "LibDiamondCut: Add facet can't be address(0)");
        uint96 selectorPosition = uint96(ds.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            require(oldFacetAddress == address(0), "LibDiamondCut: Can't add function that already exists");
            addFunction(ds, selector, selectorPosition, _facetAddress);
            selectorPosition++;
        }
    }

    function replaceFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        require(_functionSelectors.length > 0, "LibDiamondCut: No selectors in facet to cut");
        DiamondStorage storage ds = diamondStorage();
        require(_facetAddress != address(0), "LibDiamondCut: Add facet can't be address(0)");
        uint96 selectorPosition = uint96(ds.facetFunctionSelectors[_facetAddress].functionSelectors.length);
        // add new facet address if it does not exist
        if (selectorPosition == 0) {
            addFacet(ds, _facetAddress);
        }
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            require(oldFacetAddress != _facetAddress, "LibDiamondCut: Can't replace function with same function");
            removeFunction(ds, oldFacetAddress, selector);
            addFunction(ds, selector, selectorPosition, _facetAddress);
            selectorPosition++;
        }
    }

    function removeFunctions(address _facetAddress, bytes4[] memory _functionSelectors) internal {
        require(_functionSelectors.length > 0, "LibDiamondCut: No selectors in facet to cut");
        DiamondStorage storage ds = diamondStorage();
        // if function does not exist then do nothing and return
        require(_facetAddress == address(0), "LibDiamondCut: Remove facet address must be address(0)");
        for (uint256 selectorIndex; selectorIndex < _functionSelectors.length; selectorIndex++) {
            bytes4 selector = _functionSelectors[selectorIndex];
            address oldFacetAddress = ds.selectorToFacetAndPosition[selector].facetAddress;
            removeFunction(ds, oldFacetAddress, selector);
        }
    }

    function addFacet(DiamondStorage storage ds, address _facetAddress) internal {
        enforceHasContractCode(_facetAddress, "LibDiamondCut: New facet has no code");
        ds.facetFunctionSelectors[_facetAddress].facetAddressPosition = ds.facetAddresses.length;
        ds.facetAddresses.push(_facetAddress);
    }


    function addFunction(DiamondStorage storage ds, bytes4 _selector, uint96 _selectorPosition, address _facetAddress) internal {
        ds.selectorToFacetAndPosition[_selector].functionSelectorPosition = _selectorPosition;
        ds.facetFunctionSelectors[_facetAddress].functionSelectors.push(_selector);
        ds.selectorToFacetAndPosition[_selector].facetAddress = _facetAddress;
    }

    function removeFunction(DiamondStorage storage ds, address _facetAddress, bytes4 _selector) internal {
        require(_facetAddress != address(0), "LibDiamondCut: Can't remove function that doesn't exist");
        // an immutable function is a function defined directly in a diamond
        require(_facetAddress != address(this), "LibDiamondCut: Can't remove immutable function");
        // replace selector with last selector, then delete last selector
        uint256 selectorPosition = ds.selectorToFacetAndPosition[_selector].functionSelectorPosition;
        uint256 lastSelectorPosition = ds.facetFunctionSelectors[_facetAddress].functionSelectors.length - 1;
        // if not the same then replace _selector with lastSelector
        if (selectorPosition != lastSelectorPosition) {
            bytes4 lastSelector = ds.facetFunctionSelectors[_facetAddress].functionSelectors[lastSelectorPosition];
            ds.facetFunctionSelectors[_facetAddress].functionSelectors[selectorPosition] = lastSelector;
            ds.selectorToFacetAndPosition[lastSelector].functionSelectorPosition = uint96(selectorPosition);
        }
        // delete the last selector
        ds.facetFunctionSelectors[_facetAddress].functionSelectors.pop();
        delete ds.selectorToFacetAndPosition[_selector];

        // if no more selectors for facet address then delete the facet address
        if (lastSelectorPosition == 0) {
            // replace facet address with last facet address and delete last facet address
            uint256 lastFacetAddressPosition = ds.facetAddresses.length - 1;
            uint256 facetAddressPosition = ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;
            if (facetAddressPosition != lastFacetAddressPosition) {
                address lastFacetAddress = ds.facetAddresses[lastFacetAddressPosition];
                ds.facetAddresses[facetAddressPosition] = lastFacetAddress;
                ds.facetFunctionSelectors[lastFacetAddress].facetAddressPosition = facetAddressPosition;
            }
            ds.facetAddresses.pop();
            delete ds.facetFunctionSelectors[_facetAddress].facetAddressPosition;
        }
    }

    function initializeDiamondCut(address _init, bytes memory _calldata) internal {
        if (_init == address(0)) {
            require(_calldata.length == 0, "LibDiamondCut: _init is address(0) but_calldata is not empty");
        } else {
            require(_calldata.length > 0, "LibDiamondCut: _calldata is empty but _init is not address(0)");
            if (_init != address(this)) {
                enforceHasContractCode(_init, "LibDiamondCut: _init address has no code");
            }
            (bool success, bytes memory error) = _init.delegatecall(_calldata);
            if (!success) {
                if (error.length > 0) {
                    // bubble up the error
                    revert(string(error));
                } else {
                    revert("LibDiamondCut: _init function reverted");
                }
            }
        }
    }

    function enforceHasContractCode(address _contract, string memory _errorMessage) internal view {
        uint256 contractSize;
        assembly {
            contractSize := extcodesize(_contract)
        }
        require(contractSize > 0, _errorMessage);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Adapted from the Diamond 3 reference implementation by Nick Mudge:
// https://github.com/mudgen/diamond-3-hardhat

interface IDiamondCut {
    enum FacetCutAction {
        Add,
        Replace,
        Remove
    }
    // Add=0, Replace=1, Remove=2

    struct FacetCut {
        address facetAddress;
        FacetCutAction action;
        bytes4[] functionSelectors;
    }

    /// @notice Add/replace/remove any number of functions and optionally execute
    ///         a function with delegatecall
    /// @param _diamondCut Contains the facet addresses and function selectors
    /// @param _init The address of the contract or facet to execute _calldata
    /// @param _calldata A function call, including function selector and arguments
    ///                  _calldata is executed with delegatecall on _init
    function diamondCut(
        FacetCut[] calldata _diamondCut,
        address _init,
        bytes calldata _calldata
    ) external;

    event DiamondCut(FacetCut[] _diamondCut, address _init, bytes _calldata);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "ERC20.sol";
import "Context.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 currentAllowance = allowance(account, _msgSender());
        require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance");
        unchecked {
            _approve(account, _msgSender(), currentAllowance - amount);
        }
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "IERC20Metadata.sol";
import "Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

interface IStatsFacet {
    function getUnicornMetadata(uint256 _tokenId)
        external
        view
        returns (
            bool origin,
            bool gameLocked,
            bool limitedEdition,
            uint256 lifecycleStage,
            uint256 breedingPoints,
            uint256 unicornClass,
            uint256 hatchBirthday
        );

    function getStats(uint256 _dna)
        external
        view
        returns (
            uint256 attack,
            uint256 accuracy,
            uint256 movementSpeed,
            uint256 attackSpeed,
            uint256 defense,
            uint256 vitality,
            uint256 resistance,
            uint256 magic
        );
}

{
  "evmVersion": "istanbul",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "DarkForest.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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"outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sacrificer","type":"address"}],"name":"resetSacrificeForSacrificer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_fee","type":"uint256"}],"name":"setChainlinkVRFFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_keyhash","type":"bytes32"}],"name":"setChainlinkVRFKeyhash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_CryptoUnicornsAddress","type":"address"}],"name":"setCryptoUnicornsAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[3]","name":"_LootboxPoolIds","type":"uint256[3]"}],"name":"setLootboxPoolIds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[3]","name":"_bonuses","type":"uint256[3]"}],"name":"setShadowcornEggBonusesToUnicornMilk","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[3]","name":"_ShadowcornPoolIds","type":"uint256[3]"}],"name":"setShadowcornPoolIds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_StakePeriodSeconds","type":"uint256"}],"name":"setStakePeriodSeconds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_TerminusAddress","type":"address"}],"name":"setTerminusAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_UnicornMilkStakingReward","type":"uint256"}],"name":"setUnicornMilkStakingReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[3]","name":"_UnicornMilkThresholds","type":"uint256[3]"}],"name":"setUnicornMilkThresholds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_UnicornMilkTokenAddress","type":"address"}],"name":"setUnicornMilkTokenAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"shadowcornEggBonusesToUnicornMilk","outputs":[{"internalType":"uint256[3]","name":"","type":"uint256[3]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"shadowcornPoolIds","outputs":[{"internalType":"uint256[3]","name":"","type":"uint256[3]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakePeriodSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"staker","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"surrenderTerminusPools","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"terminusAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_staker","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfStakerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unicornMilkStakingReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unicornMilkThresholds","outputs":[{"internalType":"uint256[3]","name":"","type":"uint256[3]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unicornMilkTokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"unstakesAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_requestId","type":"bytes32"}],"name":"viewSacrifice","outputs":[{"components":[{"internalType":"uint32","name":"status","type":"uint32"},{"internalType":"address","name":"sacrificer","type":"address"},{"internalType":"uint256","name":"threshold","type":"uint256"},{"internalType":"uint256","name":"randomness","type":"uint256"}],"internalType":"struct DarkForest.Sacrifice","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawERC20","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

-----Decoded View---------------
Arg [0] : _CryptoUnicornsAddress (address): 0xdC0479CC5BbA033B3e7De9F178607150B3AbCe1f
Arg [1] : _UnicornMilkTokenAddress (address): 0x64060aB139Feaae7f06Ca4E63189D86aDEb51691
Arg [2] : _TerminusAddress (address): 0x99A558BDBdE247C2B2716f0D4cFb0E246DFB697D
Arg [3] : _UnicornMilkStakingReward (uint256): 500000000000000000000
Arg [4] : _StakePeriodSeconds (uint256): 86400
Arg [5] : _VRFCoordinatorAddress (address): 0x3d2341ADb2D31f1c5530cDC622016af293177AE0
Arg [6] : _LinkTokenAddress (address): 0xb0897686c545045aFc77CF20eC7A532E3120E0F1
Arg [7] : _ChainlinkVRFFee (uint256): 100000000000000
Arg [8] : _ChainlinkVRFKeyhash (bytes32): 0xf86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da

-----Encoded View---------------
9 Constructor Arguments found :
Arg [0] : 000000000000000000000000dc0479cc5bba033b3e7de9f178607150b3abce1f
Arg [1] : 00000000000000000000000064060ab139feaae7f06ca4e63189d86adeb51691
Arg [2] : 00000000000000000000000099a558bdbde247c2b2716f0d4cfb0e246dfb697d
Arg [3] : 00000000000000000000000000000000000000000000001b1ae4d6e2ef500000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000015180
Arg [5] : 0000000000000000000000003d2341adb2d31f1c5530cdc622016af293177ae0
Arg [6] : 000000000000000000000000b0897686c545045afc77cf20ec7a532e3120e0f1
Arg [7] : 00000000000000000000000000000000000000000000000000005af3107a4000
Arg [8] : f86195cf7690c55907b2b611ebb7343a6f649bff128701cc542f0569e2c549da