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// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

import "./Common.sol";

/**
 * @title Coin Flip game, players predict if outcome will be heads or tails
 */

contract CoinFlip is Common {
    using SafeERC20 for IERC20;

    constructor(address _bankroll, address _vrf, address link_eth_feed) {
        Bankroll = IBankRoll(_bankroll);
        IChainLinkVRF = IVRFCoordinatorV2(_vrf);
        LINK_ETH_FEED = AggregatorV3Interface(link_eth_feed);
        ChainLinkVRF = _vrf;
    }

    struct CoinFlipGame {
        uint256 wager;
        uint256 stopGain;
        uint256 stopLoss;
        uint256 requestID;
        address tokenAddress;
        uint64 blockNumber;
        uint32 numBets;
        bool isHeads;
    }

    mapping(address => CoinFlipGame) coinFlipGames;
    mapping(uint256 => address) coinIDs;

    /**
     * @dev event emitted by the VRF callback with the bet results
     * @param playerAddress address of the player that made the bet
     * @param wager wager amount
     * @param payout total payout transfered to the player
     * @param tokenAddress address of token the wager was made and payout, 0 address is considered the native coin
     * @param coinOutcomes results of coinFlip, 1-> Heads, 0 ->Tails
     * @param payouts individual payouts for each bet
     * @param numGames number of games performed
     */
    event CoinFlip_Outcome_Event(
        address indexed playerAddress,
        uint256 wager,
        uint256 payout,
        address tokenAddress,
        uint8[] coinOutcomes,
        uint256[] payouts,
        uint32 numGames
    );

    /**
     * @dev event emitted when a refund is done in coin flip
     * @param player address of the player reciving the refund
     * @param wager amount of wager that was refunded
     * @param tokenAddress address of token the refund was made in
     */
    event CoinFlip_Refund_Event(
        address indexed player,
        uint256 wager,
        address tokenAddress
    );

    error WagerAboveLimit(uint256 wager, uint256 maxWager);
    error AwaitingVRF(uint256 requestID);
    error InvalidNumBets(uint256 maxNumBets);
    error NotAwaitingVRF();
    error BlockNumberTooLow(uint256 have, uint256 want);
    error OnlyCoordinatorCanFulfill(address have, address want);

    /**
     * @dev function to get current request player is await from VRF, returns 0 if none
     * @param player address of the player to get the state
     */
    function CoinFlip_GetState(
        address player
    ) external view returns (CoinFlipGame memory) {
        return (coinFlipGames[player]);
    }

    /**
     * @dev Function to play Coin Flip, takes the user wager saves bet parameters and makes a request to the VRF
     * @param wager wager amount
     * @param tokenAddress address of token to bet, 0 address is considered the native coin
     * @param numBets number of bets to make, and amount of random numbers to request
     * @param stopGain treshold value at which the bets stop if a certain profit is obtained
     * @param stopLoss treshold value at which the bets stop if a certain loss is obtained
     * @param isHeads if bet selected heads or Tails
     */
    function CoinFlip_Play(
        uint256 wager,
        address tokenAddress,
        bool isHeads,
        uint32 numBets,
        uint256 stopGain,
        uint256 stopLoss
    ) external payable nonReentrant {
        if (coinFlipGames[msg.sender].requestID != 0) {
            revert AwaitingVRF(coinFlipGames[msg.sender].requestID);
        }
        if (!(numBets > 0 && numBets <= 100)) {
            revert InvalidNumBets(100);
        }

        _kellyWager(wager, tokenAddress);
        _transferWager(tokenAddress, wager * numBets, 1000000);
        uint256 id = _requestRandomWords(numBets);

        coinFlipGames[msg.sender] = CoinFlipGame(
            wager,
            stopGain,
            stopLoss,
            id,
            tokenAddress,
            uint64(block.number),
            numBets,
            isHeads
        );
        coinIDs[id] = msg.sender;
    }

    /**
     * @dev Function to refund user in case of VRF request failling
     */
    function CoinFlip_Refund() external nonReentrant {
        CoinFlipGame storage game = coinFlipGames[msg.sender];
        if (game.requestID == 0) {
            revert NotAwaitingVRF();
        }
        if (game.blockNumber + 200 > block.number) {
            revert BlockNumberTooLow(block.number, game.blockNumber + 200);
        }

        uint256 wager = game.wager * game.numBets;
        address tokenAddress = game.tokenAddress;

        delete (coinIDs[game.requestID]);
        delete (coinFlipGames[msg.sender]);

        if (tokenAddress == address(0)) {
            (bool success, ) = payable(msg.sender).call{value: wager}("");
            if (!success) {
                revert TransferFailed();
            }
        } else {
            IERC20(tokenAddress).safeTransfer(msg.sender, wager);
        }
        emit CoinFlip_Refund_Event(msg.sender, wager, tokenAddress);
    }

    /**
     * @dev function called by Chainlink VRF with random numbers
     * @param requestId id provided when the request was made
     * @param randomWords array of random numbers
     */
    function rawFulfillRandomWords(
        uint256 requestId,
        uint256[] memory randomWords
    ) external {
        if (msg.sender != ChainLinkVRF) {
            revert OnlyCoordinatorCanFulfill(msg.sender, ChainLinkVRF);
        }
        fulfillRandomWords(requestId, randomWords);
    }

    function fulfillRandomWords(
        uint256 requestId,
        uint256[] memory randomWords
    ) internal {
        address playerAddress = coinIDs[requestId];
        if (playerAddress == address(0)) revert();
        CoinFlipGame storage game = coinFlipGames[playerAddress];

        int256 totalValue;
        uint256 payout;
        uint32 i;
        uint8[] memory coinFlip = new uint8[](game.numBets);
        uint256[] memory payouts = new uint256[](game.numBets);

        address tokenAddress = game.tokenAddress;

        for (i = 0; i < game.numBets; i++) {
            if (totalValue >= int256(game.stopGain)) {
                break;
            }
            if (totalValue <= -int256(game.stopLoss)) {
                break;
            }

            coinFlip[i] = uint8(randomWords[i] % 2);

            if (coinFlip[i] == 1 && game.isHeads == true) {
                totalValue += int256((game.wager * 9800) / 10000);
                payout += (game.wager * 19800) / 10000;
                payouts[i] = (game.wager * 19800) / 10000;
                continue;
            }
            if (coinFlip[i] == 0 && game.isHeads == false) {
                totalValue += int256((game.wager * 9800) / 10000);
                payout += (game.wager * 19800) / 10000;
                payouts[i] = (game.wager * 19800) / 10000;
                continue;
            }

            totalValue -= int256(game.wager);
        }

        payout += (game.numBets - i) * game.wager;

        emit CoinFlip_Outcome_Event(
            playerAddress,
            game.wager,
            payout,
            tokenAddress,
            coinFlip,
            payouts,
            i
        );
        _transferToBankroll(tokenAddress, game.wager * game.numBets);
        delete (coinIDs[requestId]);
        delete (coinFlipGames[playerAddress]);
        if (payout != 0) {
            _transferPayout(playerAddress, payout, tokenAddress);
        }
    }

    /**
     * @dev calculates the maximum wager allowed based on the bankroll size
     */
    function _kellyWager(uint256 wager, address tokenAddress) internal view {
        uint256 balance;
        if (tokenAddress == address(0)) {
            balance = address(Bankroll).balance;
        } else {
            balance = IERC20(tokenAddress).balanceOf(address(Bankroll));
        }
        uint256 maxWager = (balance * 1122448) / 100000000;
        if (wager > maxWager) {
            revert WagerAboveLimit(wager, maxWager);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

import "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {SafeERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

interface IBankRoll {
    function getIsGame(address game) external view returns (bool);

    function getIsValidWager(
        address game,
        address tokenAddress
    ) external view returns (bool);

    function transferPayout(
        address player,
        uint256 payout,
        address token
    ) external;

    function getOwner() external view returns (address);

    function isPlayerSuspended(
        address player
    ) external view returns (bool, uint256);
}

interface IVRFCoordinatorV2 is VRFCoordinatorV2Interface {
    function getFeeConfig()
        external
        view
        returns (
            uint32,
            uint32,
            uint32,
            uint32,
            uint32,
            uint24,
            uint24,
            uint24,
            uint24
        );
}

contract Common is ReentrancyGuard {
    using SafeERC20 for IERC20;

    uint256 public VRFFees;
    address public ChainLinkVRF;

    AggregatorV3Interface public LINK_ETH_FEED;
    IVRFCoordinatorV2 public IChainLinkVRF;
    IBankRoll public Bankroll;

    error NotApprovedBankroll();
    error InvalidValue(uint256 required, uint256 sent);
    error TransferFailed();
    error RefundFailed();
    error NotOwner(address want, address have);
    error ZeroWager();
    error PlayerSuspended(uint256 suspensionTime);

    /**
     * @dev function to transfer the player wager to bankroll, and charge for VRF fee
     * , reverts if bankroll doesn't approve game or token
     * @param tokenAddress address of the token the wager is made on
     * @param wager total amount wagered
     */

    function _transferWager(
        address tokenAddress,
        uint256 wager,
        uint256 gasAmount
    ) internal {
        if (!Bankroll.getIsValidWager(address(this), tokenAddress)) {
            revert NotApprovedBankroll();
        }
        if (wager == 0) {
            revert ZeroWager();
        }
        (bool suspended, uint256 suspendedTime) = Bankroll.isPlayerSuspended(
            msg.sender
        );
        if (suspended) {
            revert PlayerSuspended(suspendedTime);
        }
        uint256 VRFfee = getVRFFee(gasAmount);
        if (tokenAddress == address(0)) {
            if (msg.value < wager + VRFfee) {
                revert InvalidValue(wager + VRFfee, msg.value);
            }
            _refundExcessValue(msg.value - (VRFfee + wager));
        } else {
            if (msg.value < VRFfee) {
                revert InvalidValue(VRFfee, msg.value);
            }
            IERC20(tokenAddress).safeTransferFrom(
                msg.sender,
                address(this),
                wager
            );
            _refundExcessValue(msg.value - VRFfee);
        }
        VRFFees += VRFfee;
    }

    /**
     * @dev function to transfer the wager held by the game contract to the bankroll
     * @param tokenAddress address of the token to transfer
     * @param amount token amount to transfer
     */
    function _transferToBankroll(
        address tokenAddress,
        uint256 amount
    ) internal {
        if (tokenAddress == address(0)) {
            (bool success, ) = payable(address(Bankroll)).call{value: amount}(
                ""
            );
            if (!success) {
                revert RefundFailed();
            }
        } else {
            IERC20(tokenAddress).safeTransfer(address(Bankroll), amount);
        }
    }

    /**
     * @dev calculates in form of native token the fee charged by chainlink VRF
     * @return fee amount of fee user has to pay
     */
    function getVRFFee(uint256 gasAmount) public view returns (uint256 fee) {
        (, int256 answer, , , ) = LINK_ETH_FEED.latestRoundData();
        (uint32 fulfillmentFlatFeeLinkPPMTier1, , , , , , , , ) = IChainLinkVRF
            .getFeeConfig();

        fee =
            tx.gasprice *
            (gasAmount) +
            ((1e12 *
                uint256(fulfillmentFlatFeeLinkPPMTier1) *
                uint256(answer)) / 1e18);
    }

    /**
     * @dev returns to user the excess fee sent to pay for the VRF
     * @param refund amount to send back to user
     */
    function _refundExcessValue(uint256 refund) internal {
        if (refund == 0) {
            return;
        }
        (bool success, ) = payable(msg.sender).call{value: refund}("");
        if (!success) {
            revert RefundFailed();
        }
    }

    /**
     * @dev function to charge user for VRF
     */
    function _payVRFFee(uint256 gasAmount) internal {
        uint256 VRFfee = getVRFFee(gasAmount);
        if (msg.value < VRFfee) {
            revert InvalidValue(VRFfee, msg.value);
        }
        _refundExcessValue(msg.value - VRFfee);
        VRFFees += VRFfee;
    }

    /**
     * @dev function to transfer VRF fees acumulated in the contract to the Bankroll
     * Can only be called by owner
     */
    function transferFees(address to) external nonReentrant {
        if (msg.sender != Bankroll.getOwner()) {
            revert NotOwner(Bankroll.getOwner(), msg.sender);
        }
        uint256 fee = VRFFees;
        VRFFees = 0;
        (bool success, ) = payable(address(to)).call{value: fee}("");
        if (!success) {
            revert TransferFailed();
        }
    }

    /**
     * @dev function to transfer wager to game contract, without charging for VRF
     * @param tokenAddress tokenAddress the wager is made on
     * @param wager wager amount
     */
    function _transferWagerPvPNoVRF(
        address tokenAddress,
        uint256 wager
    ) internal {
        if (!Bankroll.getIsValidWager(address(this), tokenAddress)) {
            revert NotApprovedBankroll();
        }
        if (tokenAddress == address(0)) {
            if (!(msg.value == wager)) {
                revert InvalidValue(wager, msg.value);
            }
        } else {
            IERC20(tokenAddress).safeTransferFrom(
                msg.sender,
                address(this),
                wager
            );
        }
    }

    /**
     * @dev function to transfer wager to game contract, including charge for VRF
     * @param tokenAddress tokenAddress the wager is made on
     * @param wager wager amount
     */
    function _transferWagerPvP(
        address tokenAddress,
        uint256 wager,
        uint256 gasAmount
    ) internal {
        if (!Bankroll.getIsValidWager(address(this), tokenAddress)) {
            revert NotApprovedBankroll();
        }

        uint256 VRFfee = getVRFFee(gasAmount);
        if (tokenAddress == address(0)) {
            if (msg.value < wager + VRFfee) {
                revert InvalidValue(wager, msg.value);
            }

            _refundExcessValue(msg.value - (VRFfee + wager));
        } else {
            if (msg.value < VRFfee) {
                revert InvalidValue(VRFfee, msg.value);
            }

            IERC20(tokenAddress).safeTransferFrom(
                msg.sender,
                address(this),
                wager
            );
            _refundExcessValue(msg.value - VRFfee);
        }
        VRFFees += VRFfee;
    }

    /**
     * @dev transfers payout from the game contract to the players
     * @param player address of the player to transfer the payout to
     * @param payout amount of payout to transfer
     * @param tokenAddress address of the token that payout will be transfered
     */
    function _transferPayoutPvP(
        address player,
        uint256 payout,
        address tokenAddress
    ) internal {
        if (tokenAddress == address(0)) {
            (bool success, ) = payable(player).call{value: payout}("");
            if (!success) {
                revert TransferFailed();
            }
        } else {
            IERC20(tokenAddress).safeTransfer(player, payout);
        }
    }

    /**
     * @dev transfers house edge from game contract to bankroll
     * @param amount amount to transfer
     * @param tokenAddress address of token to transfer
     */
    function _transferHouseEdgePvP(
        uint256 amount,
        address tokenAddress
    ) internal {
        if (tokenAddress == address(0)) {
            (bool success, ) = payable(address(Bankroll)).call{value: amount}(
                ""
            );
            if (!success) {
                revert TransferFailed();
            }
        } else {
            IERC20(tokenAddress).safeTransfer(address(Bankroll), amount);
        }
    }

    /**
     * @dev function to request bankroll to give payout to player
     * @param player address of the player
     * @param payout amount of payout to give
     * @param tokenAddress address of the token in which to give the payout
     */
    function _transferPayout(
        address player,
        uint256 payout,
        address tokenAddress
    ) internal {
        Bankroll.transferPayout(player, payout, tokenAddress);
    }

    /**
     * @dev function to send the request for randomness to chainlink
     * @param numWords number of random numbers required
     */
    function _requestRandomWords(
        uint32 numWords
    ) internal returns (uint256 s_requestId) {
        s_requestId = VRFCoordinatorV2Interface(ChainLinkVRF)
            .requestRandomWords(
                0xd729dc84e21ae57ffb6be0053bf2b0668aa2aaf300a2a7b2ddf7dc0bb6e875a8,
                576,
                3,
                2500000,
                numWords
            );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

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 making 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: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

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

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;

  /*
   * @notice Check to see if there exists a request commitment consumers
   * for all consumers and keyhashes for a given sub.
   * @param subId - ID of the subscription
   * @return true if there exists at least one unfulfilled request for the subscription, false
   * otherwise.
   */
  function pendingRequestExists(uint64 subId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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CoinFlip.CoinFlipGame","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"wager","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"bool","name":"isHeads","type":"bool"},{"internalType":"uint32","name":"numBets","type":"uint32"},{"internalType":"uint256","name":"stopGain","type":"uint256"},{"internalType":"uint256","name":"stopLoss","type":"uint256"}],"name":"CoinFlip_Play","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"CoinFlip_Refund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"IChainLinkVRF","outputs":[{"internalType":"contract IVRFCoordinatorV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LINK_ETH_FEED","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VRFFees","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"gasAmount","type":"uint256"}],"name":"getVRFFee","outputs":[{"internalType":"uint256","name":"fee","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"requestId","type":"uint256"},{"internalType":"uint256[]","name":"randomWords","type":"uint256[]"}],"name":"rawFulfillRandomWords","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"transferFees","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000051e99a0d09eeca8d7efec3062ac024b6d0989959000000000000000000000000ae975071be8f8ee67addbc1a82488f1c248580670000000000000000000000005787befdc0ecd210dfa948264631cd53e68f7802

-----Decoded View---------------
Arg [0] : _bankroll (address): 0x51e99A0D09EeCa8d7EFEc3062AC024B6d0989959
Arg [1] : _vrf (address): 0xAE975071Be8F8eE67addBC1A82488F1C24858067
Arg [2] : link_eth_feed (address): 0x5787BefDc0ECd210Dfa948264631CD53E68F7802

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000051e99a0d09eeca8d7efec3062ac024b6d0989959
Arg [1] : 000000000000000000000000ae975071be8f8ee67addbc1a82488f1c24858067
Arg [2] : 0000000000000000000000005787befdc0ecd210dfa948264631cd53e68f7802