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/**
 *Submitted for verification at Etherscan.io on 2022-08-24
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;


abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

abstract contract Ownable is Context {
    address private _owner;

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

    constructor() {
        _transferOwnership(_msgSender());
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

abstract contract ReentrancyGuard {

    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // 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;
    }

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


interface IERC20 {

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

interface IERC20Permit {
    
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function nonces(address owner) external view returns (uint256);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

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);
}

library Address {
    
    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;
    }

    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");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    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");
    }

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

    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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);
        }
    }
}


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));
    }

    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");
    }

    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");
        }
    }
}

interface IERC721 is IERC165 {

    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    function approve(address to, uint256 tokenId) external;
    function setApprovalForAll(address operator, bool _approved) external;
    function getApproved(uint256 tokenId) external view returns (address operator);
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}


contract ERC721Staking is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    // Interfaces for ERC20 and ERC721
    IERC20 public immutable rewardsToken;
    IERC721 public immutable nftCollection;

    uint256 public bonusEndTimestamp = 1677268800;

    event BonusEndTimestampUpdated(uint256 oldBonusEndTimestamp, uint256 newBonusEndTimestamp);
    event RewardsPerHourUpdated(uint256 oldRewardsPerHour, uint256 newRewardsPerHour);

    // Constructor function to set the rewards token and the NFT collection addresses
    constructor(IERC721 _nftCollection, IERC20 _rewardsToken) {
        nftCollection = _nftCollection;
        rewardsToken = _rewardsToken;
    }

    struct StakedToken {
        address staker;
        uint256 tokenId;
    }
    
    // Staker info
    struct Staker {
        // Amount of tokens staked by the staker
        uint256 amountStaked;

        // Staked token ids
        StakedToken[] stakedTokens;

        // Last time of the rewards were calculated for this user
        uint256 timeOfLastUpdate;

        // Calculated, but unclaimed rewards for the User. The rewards are
        // calculated each time the user writes to the Smart Contract
        uint256 unclaimedRewards;
    }

    // Rewards per hour per token deposited in wei.
    uint256 public rewardsPerHour = 613181151618000000000;

    // Mapping of User Address to Staker info
    mapping(address => Staker) public stakers;

    // Mapping of Token Id to staker. Made for the SC to remeber
    // who to send back the ERC721 Token to.
    mapping(uint256 => address) public stakerAddress;

    // If address already has ERC721 Token/s staked, calculate the rewards.
    // Increment the amountStaked and map msg.sender to the Token Id of the staked
    // Token to later send back on withdrawal. Finally give timeOfLastUpdate the
    // value of now.
    function stake(uint256 _tokenId) external nonReentrant {
        // If wallet has tokens staked, calculate the rewards before adding the new token
        if (stakers[msg.sender].amountStaked > 0) {
            uint256 rewards = calculateRewards(msg.sender);
            stakers[msg.sender].unclaimedRewards += rewards;
        }

        // Wallet must own the token they are trying to stake
        require(
            nftCollection.ownerOf(_tokenId) == msg.sender,
            "You don't own this token!"
        );

        // Transfer the token from the wallet to the Smart contract
        nftCollection.transferFrom(msg.sender, address(this), _tokenId);

        // Create StakedToken
        StakedToken memory stakedToken = StakedToken(msg.sender, _tokenId);

        // Add the token to the stakedTokens array
        stakers[msg.sender].stakedTokens.push(stakedToken);

        // Increment the amount staked for this wallet
        stakers[msg.sender].amountStaked++;

        // Update the mapping of the tokenId to the staker's address
        stakerAddress[_tokenId] = msg.sender;

        // Update the timeOfLastUpdate for the staker   
        stakers[msg.sender].timeOfLastUpdate = block.timestamp;
    }
    
    // Check if user has any ERC721 Tokens Staked and if they tried to withdraw,
    // calculate the rewards and store them in the unclaimedRewards
    // decrement the amountStaked of the user and transfer the ERC721 token back to them
    function withdraw(uint256 _tokenId) external nonReentrant {
        require(block.timestamp >= bonusEndTimestamp, "NFTs are locked");
        // Make sure the user has at least one token staked before withdrawing
        require(
            stakers[msg.sender].amountStaked > 0,
            "You have no tokens staked"
        );
        
        // Wallet must own the token they are trying to withdraw
        require(stakerAddress[_tokenId] == msg.sender, "You don't own this token!");

        // Update the rewards for this user, as the amount of rewards decreases with less tokens.
        uint256 rewards = calculateRewards(msg.sender);
        stakers[msg.sender].unclaimedRewards += rewards;

        // Find the index of this token id in the stakedTokens array
        uint256 index = 0;
        for (uint256 i = 0; i < stakers[msg.sender].stakedTokens.length; i++) {
            if (
                stakers[msg.sender].stakedTokens[i].tokenId == _tokenId 
                && 
                stakers[msg.sender].stakedTokens[i].staker != address(0)
            ) {
                index = i;
                break;
            }
        }

        // Set this token's .staker to be address 0 to mark it as no longer staked
        stakers[msg.sender].stakedTokens[index].staker = address(0);

        // Decrement the amount staked for this wallet
        stakers[msg.sender].amountStaked--;

        // Update the mapping of the tokenId to the be address(0) to indicate that the token is no longer staked
        stakerAddress[_tokenId] = address(0);

        // Transfer the token back to the withdrawer
        nftCollection.transferFrom(address(this), msg.sender, _tokenId);

        // Update the timeOfLastUpdate for the withdrawer   
        stakers[msg.sender].timeOfLastUpdate = block.timestamp;
    }

    // Calculate rewards for the msg.sender, check if there are any rewards
    // claim, set unclaimedRewards to 0 and transfer the ERC20 Reward token
    // to the user.
    function claimRewards() external {
        uint256 rewards = calculateRewards(msg.sender) +
            stakers[msg.sender].unclaimedRewards;
        require(rewards > 0, "You have no rewards to claim");
        stakers[msg.sender].timeOfLastUpdate = block.timestamp;
        stakers[msg.sender].unclaimedRewards = 0;
        rewardsToken.safeTransfer(msg.sender, rewards);
    }


    //////////
    // View //
    //////////

    function availableRewards(address _staker) public view returns (uint256) {
        uint256 rewards = calculateRewards(_staker) +
            stakers[_staker].unclaimedRewards;
        return rewards;
    }

    function getStakedTokens(address _user) public view returns (uint256[] memory) {
        // Check if we know this user
        if (stakers[_user].amountStaked > 0) {
            // Return all the tokens in the stakedToken Array for this user that are not -1
            uint256[] memory _stakedTokens = new uint256[](stakers[_user].amountStaked);
            uint256 _index = 0;

            for (uint256 j = 0; j < stakers[_user].stakedTokens.length; j++) {
                if (stakers[_user].stakedTokens[j].staker != (address(0))) {
                    _stakedTokens[_index] = stakers[_user].stakedTokens[j].tokenId;
                    _index++;
                }
            }

            return _stakedTokens;
        }
        
        // Otherwise, return empty array
        else {
            return new uint256[](0);
        }
    }

    function updateBonusEndTimestamp(uint256 timestamp) external onlyOwner {
        uint256 oldBonusEndTimestamp = bonusEndTimestamp;
        bonusEndTimestamp = timestamp;

        emit BonusEndTimestampUpdated(oldBonusEndTimestamp, timestamp);
    }

    function emergencyWithdraw(IERC20 token, uint256 amount) external onlyOwner {
        token.safeTransfer(owner(), amount);
    }

    function updateRewardPerHour(uint256 newRewardsPerHour) external onlyOwner {
        uint256 oldRewardsPerHour = rewardsPerHour;
        rewardsPerHour = newRewardsPerHour;

        emit RewardsPerHourUpdated(oldRewardsPerHour, newRewardsPerHour);
    }

    /////////////
    // Internal//
    /////////////

    // Calculate rewards for param _staker by calculating the time passed
    // since last update in hours and mulitplying it to ERC721 Tokens Staked
    // and rewardsPerHour.
    function calculateRewards(address _staker)
        internal
        view
        returns (uint256 _rewards)
    {
        if (block.timestamp <= bonusEndTimestamp)
            return (((
                ((block.timestamp - stakers[_staker].timeOfLastUpdate) *
                    stakers[_staker].amountStaked)
            ) * rewardsPerHour) / 3600);
        
        else if(stakers[_staker].timeOfLastUpdate >= bonusEndTimestamp) {
            return 0;
        }
        return (((
            ((bonusEndTimestamp - stakers[_staker].timeOfLastUpdate) *
                stakers[_staker].amountStaked)
        ) * rewardsPerHour) / 3600);
    }
}

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070033

0000000000000000000000005c2644775f0ef7a23d682d03028f739f6adbcc0b00000000000000000000000057c411e9a358e2d2d0a6b058cedb709175e8fd16

-----Decoded View---------------
Arg [0] : _nftCollection (address): 0x5C2644775F0EF7a23D682D03028f739f6AdbCC0B
Arg [1] : _rewardsToken (address): 0x57c411e9a358e2d2d0a6b058cEDb709175e8fd16

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000005c2644775f0ef7a23d682d03028f739f6adbcc0b
Arg [1] : 00000000000000000000000057c411e9a358e2d2d0a6b058cedb709175e8fd16

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