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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract GenesisStaker {
    address public constant CRE = 0xe81432473290F4ffCFc5E823F8069Db83e8A677B;
    address public constant CREPE = 0x5516d551Af482B4eef4B909138d5e48e05a7f50a;

    struct StakeConfig {
        uint32 start;
        uint32 end;
        uint128 exchangeRate;
        uint256 totalStaked;
        uint256 totalStaker;
    }

    mapping(uint8 => StakeConfig) public stakeConfigs;
    mapping(uint8 => mapping(address => uint256)) public userStakedAmount;

    event Stake(address indexed staker, uint8 stakeId, uint256 indexed unstakedAmount, uint256 indexed stakedAmount);
    event Unstake(address indexed staker, uint8 stakeId, uint256 indexed unstakedAmount);

    constructor(uint32[3] memory start_, uint32[3] memory end_) {
        stakeConfigs[0] =
            StakeConfig({start: start_[0], end: end_[0], exchangeRate: 104 * 1e16, totalStaked: 0, totalStaker: 0});

        stakeConfigs[1] =
            StakeConfig({start: start_[1], end: end_[1], exchangeRate: 112 * 1e16, totalStaked: 0, totalStaker: 0});

        stakeConfigs[2] =
            StakeConfig({start: start_[2], end: end_[2], exchangeRate: 136 * 1e16, totalStaked: 0, totalStaker: 0});
    }

    /// @notice burn CREPE tokens and record the balance for paying rewards in CRE tokens
    /// @param stakeId ID to identify lockup period(3, 6, 12 month)
    /// @param amount amount of CREPE token
    function stake(uint8 stakeId, uint256 amount) external {
        require(amount > 0, "GenesisStaker: invalid amount");
        require(stakeConfigs[stakeId].start > block.timestamp, "GenesisStaker: already started");

        unchecked {
            if (userStakedAmount[stakeId][msg.sender] == 0) {
                stakeConfigs[stakeId].totalStaker++;
            }

            // Since the total amount of CREPE tokens issued does not exceed the overflow range of uint256 type
            // there is no need to check overflow.
            userStakedAmount[stakeId][msg.sender] += amount;
            stakeConfigs[stakeId].totalStaked += amount;
        }

        IERC20(CREPE).transferFrom(msg.sender, 0x000000000000000000000000000000000000dEaD, amount);

        emit Stake(msg.sender, stakeId, lockedCreToken(stakeId), amount);
    }

    function lockedCreToken(uint8 stakeId) public view returns (uint256) {
        unchecked {
            return userStakedAmount[stakeId][msg.sender] * stakeConfigs[stakeId].exchangeRate / 1e18;
        }
    }

    /// @notice claim staking rewards after lockup period
    /// @param stakeId ID to identify lock-up period(3, 6, 12 month)
    function unstake(uint8 stakeId) external {
        require(stakeConfigs[stakeId].end <= block.timestamp, "GenesisStaker: not ended");

        uint256 lockedCreAmount = lockedCreToken(stakeId);

        uint256 stakedAmount = userStakedAmount[stakeId][msg.sender];
        require(stakedAmount > 0, "GenesisStaker: not enough stake amount");

        unchecked {
            userStakedAmount[stakeId][msg.sender] = 0;
            stakeConfigs[stakeId].totalStaked -= stakedAmount;
            stakeConfigs[stakeId].totalStaker -= 1;
        }

        IERC20(CRE).transfer(msg.sender, lockedCreAmount);

        emit Unstake(msg.sender, stakeId, lockedCreAmount);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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);
}

{
  "remappings": [
    "@openzeppelin-upgradeable/contracts/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/=lib/openzeppelin-contracts/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint32[3]","name":"start_","type":"uint32[3]"},{"internalType":"uint32[3]","name":"end_","type":"uint32[3]"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint8","name":"stakeId","type":"uint8"},{"indexed":true,"internalType":"uint256","name":"unstakedAmount","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"stakedAmount","type":"uint256"}],"name":"Stake","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"staker","type":"address"},{"indexed":false,"internalType":"uint8","name":"stakeId","type":"uint8"},{"indexed":true,"internalType":"uint256","name":"unstakedAmount","type":"uint256"}],"name":"Unstake","type":"event"},{"inputs":[],"name":"CRE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"CREPE","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"stakeId","type":"uint8"}],"name":"lockedCreToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"stakeId","type":"uint8"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"","type":"uint8"}],"name":"stakeConfigs","outputs":[{"internalType":"uint32","name":"start","type":"uint32"},{"internalType":"uint32","name":"end","type":"uint32"},{"internalType":"uint128","name":"exchangeRate","type":"uint128"},{"internalType":"uint256","name":"totalStaked","type":"uint256"},{"internalType":"uint256","name":"totalStaker","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"stakeId","type":"uint8"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"","type":"uint8"},{"internalType":"address","name":"","type":"address"}],"name":"userStakedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000000000000000000000000000000000000064a20f800000000000000000000000000000000000000000000000000000000064a20f800000000000000000000000000000000000000000000000000000000064a20f80000000000000000000000000000000000000000000000000000000006518b6800000000000000000000000000000000000000000000000000000000065920080000000000000000000000000000000000000000000000000000000006681f180

-----Decoded View---------------
Arg [0] : start_ (uint32[3]): 1688342400,1688342400,1688342400
Arg [1] : end_ (uint32[3]): 1696118400,1704067200,1719792000

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000064a20f80
Arg [1] : 0000000000000000000000000000000000000000000000000000000064a20f80
Arg [2] : 0000000000000000000000000000000000000000000000000000000064a20f80
Arg [3] : 000000000000000000000000000000000000000000000000000000006518b680
Arg [4] : 0000000000000000000000000000000000000000000000000000000065920080
Arg [5] : 000000000000000000000000000000000000000000000000000000006681f180