//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
import "./../core/CoreRewarder.sol";
contract ThePixelsIncRewarder is CoreRewarder {
    constructor(
        address targetAddress,
        address rewardAddress,
        uint256 rewardRate,
        uint256 rewardFrequency,
        uint256 initialReward,
        uint256 boostRate
    )
        CoreRewarder(
            targetAddress,
            rewardAddress,
            rewardRate,
            rewardFrequency,
            initialReward,
            boostRate
        )
    {}
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "./CoreStaking.sol";
import "./../../common/interfaces/ICoreRewarder.sol";
import "./../../common/interfaces/ICollection.sol";
import "./../../common/interfaces/IINT.sol";
contract CoreRewarder is ICoreRewarder, CoreStaking, Ownable {
    struct TokenStatus {
        uint128 lastClaimTime;
        uint128 pendingReward;
    }
    bool public isStakingEnabled;
    bool public isClaimingEnabled;
    address public immutable rewardAddress;
    uint256 public immutable rewardRate;
    uint256 public immutable rewardFrequency;
    uint256 public immutable initialReward;
    uint256 public startTime;
    uint256 public finishTime;
    mapping(uint256 => TokenStatus) public tokenStatusses;
    constructor(
        address _targetAddress,
        address _rewardAddress,
        uint256 _rewardRate,
        uint256 _rewardFrequency,
        uint256 _initialReward,
        uint256 _boostRate
    ) CoreStaking(_targetAddress, _boostRate) {
        rewardAddress = _rewardAddress;
        rewardRate = _rewardRate;
        rewardFrequency = _rewardFrequency;
        initialReward = _initialReward;
    }
    // OWNER CONTROLS
    function setStartTime(uint256 _startTime) external onlyOwner {
        require(startTime == 0, "Start time is already set");
        startTime = _startTime;
    }
    function start() external onlyOwner {
        require(startTime == 0, "Start time is already set");
        startTime = block.timestamp;
    }
    function setFinishTime(uint256 _finishTime) external onlyOwner {
        finishTime = _finishTime;
    }
    function finish() external onlyOwner {
        finishTime = block.timestamp;
    }
    function setIsStakingEnabled(bool _isStakingEnabled) external onlyOwner {
        isStakingEnabled = _isStakingEnabled;
    }
    function setIsClaimingEnabled(bool _isClaimingEnabled) external onlyOwner {
        isClaimingEnabled = _isClaimingEnabled;
    }
    // PUBLIC - CONTROLS
    function stake(uint256[] calldata tokenIds) external override {
        require(isStakingEnabled, "Stakig is not enabled");
        if (_isRewardingStarted(startTime)) {
            _updatePendingRewards(msg.sender, tokenIds);
        }
        _stake(msg.sender, tokenIds);
    }
    function withdraw(uint256[] calldata tokenIds) external override {
        if (_isRewardingStarted(startTime)) {
            _updatePendingRewards(msg.sender, tokenIds);
        }
        _withdraw(msg.sender, tokenIds);
    }
    function claim(uint256[] calldata tokenIds) external override {
        require(isClaimingEnabled, "Claiming is not enabled");
        _claim(msg.sender, tokenIds);
    }
    function earned(uint256[] calldata tokenIds)
        external
        view
        override
        returns (uint256)
    {
        if (!_isRewardingStarted(startTime)) {
            return initialReward * tokenIds.length;
        }
        return _earnedRewards(tokenIds);
    }
    // PUBLIC - UTILITY
    function lastClaimTimesOfTokens(uint256[] memory tokenIds)
        external
        view
        override
        returns (uint256[] memory)
    {
        uint256[] memory _lastClaimTimesOfTokens = new uint256[](
            tokenIds.length
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            _lastClaimTimesOfTokens[i] = tokenStatusses[tokenIds[i]]
                .lastClaimTime;
        }
        return _lastClaimTimesOfTokens;
    }
    function isOwner(address owner, uint256 tokenId)
        external
        view
        override
        returns (bool)
    {
        return _isOwner(owner, tokenId);
    }
    function stakedTokensOfOwner(address owner)
        external
        view
        override
        returns (uint256[] memory)
    {
        return _stakedTokensOfOwner[owner];
    }
    function tokensOfOwner(address owner)
        external
        view
        override
        returns (uint256[] memory)
    {
        uint256[] memory tokenIds = ICollection(targetAddress).tokensOfOwner(
            owner
        );
        uint256[] memory stakedTokensIds = _stakedTokensOfOwner[owner];
        uint256[] memory mergedTokenIds = new uint256[](
            tokenIds.length + stakedTokensIds.length
        );
        for (uint256 i = 0; i < tokenIds.length; i++) {
            mergedTokenIds[i] = tokenIds[i];
        }
        for (uint256 i = 0; i < stakedTokensIds.length; i++) {
            mergedTokenIds[i + tokenIds.length] = stakedTokensIds[i];
        }
        return mergedTokenIds;
    }
    // INTERNAL
    function _claim(address _owner, uint256[] memory _tokenIds) internal {
        uint256 rewardAmount = _earnedRewards(_tokenIds);
        _resetPendingRewards(_owner, _tokenIds);
        require(rewardAmount != 0, "Can't claim 0 rewards");
        emit RewardClaimed(_owner, rewardAmount);
        IINT(rewardAddress).mint(_owner, rewardAmount);
    }
    function _updatePendingRewards(address _owner, uint256[] memory _tokenIds)
        internal
    {
        uint256 _startTime = startTime;
        uint256 _currentTime = _fixedCurrentTime();
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            require(
                _isOwner(_owner, _tokenIds[i]),
                "You need to own this token"
            );
            TokenStatus memory status = tokenStatusses[_tokenIds[i]];
            status.pendingReward += uint128(
                _earnedTokenReward(_tokenIds[i], _startTime, _currentTime)
            );
            status.lastClaimTime = uint128(_currentTime);
            tokenStatusses[_tokenIds[i]] = status;
        }
    }
    function _resetPendingRewards(address _owner, uint256[] memory _tokenIds)
        internal
    {
        uint256 _currentTime = _fixedCurrentTime();
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            require(
                _isOwner(_owner, _tokenIds[i]),
                "You need to own this token"
            );
            TokenStatus memory status = tokenStatusses[_tokenIds[i]];
            status.pendingReward = 0;
            status.lastClaimTime = uint128(_currentTime);
            tokenStatusses[_tokenIds[i]] = status;
        }
    }
    function _earnedRewards(uint256[] memory _tokenIds)
        internal
        view
        returns (uint256)
    {
        uint256 _startTime = startTime;
        uint256 _currentTime = _fixedCurrentTime();
        uint256 rewardAmount;
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            rewardAmount += _earnedTokenReward(
                _tokenIds[i],
                _startTime,
                _currentTime
            );
            rewardAmount += tokenStatusses[_tokenIds[i]].pendingReward;
        }
        return rewardAmount;
    }
    function _earnedTokenReward(
        uint256 _tokenId,
        uint256 _startTime,
        uint256 _currentTime
    ) internal view returns (uint256) {
        uint256 _lastClaimTimeOfToken = tokenStatusses[_tokenId].lastClaimTime;
        uint256 fixedLastClaimTimeOfToken = _fixedLastClaimTimeOfToken(
            _startTime,
            _lastClaimTimeOfToken
        );
        uint256 multiplier = _stakingMultiplierForToken(_tokenId);
        uint256 amount = ((_currentTime - fixedLastClaimTimeOfToken) /
            rewardFrequency) *
            rewardRate *
            multiplier *
            1e18;
        if (_lastClaimTimeOfToken == 0) {
            return amount + initialReward;
        }
        return amount;
    }
    function _isRewardingStarted(uint256 _startTime)
        internal
        view
        returns (bool)
    {
        if (_startTime != 0 && _startTime < block.timestamp) {
            return true;
        }
        return false;
    }
    function _fixedLastClaimTimeOfToken(
        uint256 _startTime,
        uint256 _lastClaimTimeOfToken
    ) internal pure returns (uint256) {
        if (_startTime > _lastClaimTimeOfToken) {
            return _startTime;
        }
        return _lastClaimTimeOfToken;
    }
    function _fixedCurrentTime() internal view returns (uint256) {
        uint256 period = (block.timestamp - startTime) / rewardFrequency;
        uint256 currentTime = startTime + rewardFrequency * period;
        if (finishTime != 0 && finishTime < currentTime) {
            return finishTime;
        }
        return currentTime;
    }
    function _isOwner(address _owner, uint256 _tokenId)
        internal
        view
        returns (bool)
    {
        if (stakedTokenOwners[_tokenId] == _owner) {
            return true;
        }
        return IERC721(targetAddress).ownerOf(_tokenId) == _owner;
    }
    // EVENTS
    event RewardClaimed(address indexed user, uint256 reward);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/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: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
contract CoreStaking is IERC721Receiver {
    address public immutable targetAddress;
    uint256 public immutable boostRate;
    mapping(address => uint256[]) internal _stakedTokensOfOwner;
    mapping(uint256 => address) public stakedTokenOwners;
    constructor(address _targetAddress, uint256 _boostRate) {
        targetAddress = _targetAddress;
        boostRate = _boostRate;
    }
    // ERC721 Receiever
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) public pure override returns (bytes4) {
        return this.onERC721Received.selector;
    }
    // INTERNAL
    function _stake(address _owner, uint256[] calldata tokenIds) internal {
        IERC721 target = IERC721(targetAddress);
        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 tokenId = tokenIds[i];
            stakedTokenOwners[tokenId] = _owner;
            _stakedTokensOfOwner[_owner].push(tokenId);
            target.safeTransferFrom(_owner, address(this), tokenId);
        }
        emit Staked(_owner, tokenIds);
    }
    function _withdraw(address _owner, uint256[] calldata tokenIds) internal {
        IERC721 target = IERC721(targetAddress);
        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 tokenId = tokenIds[i];
            require(
                stakedTokenOwners[tokenId] == _owner,
                "You must own the token."
            );
            stakedTokenOwners[tokenId] = address(0);
            // Remove tokenId from the user staked tokenId list
            uint256[] memory newStakedTokensOfOwner = _stakedTokensOfOwner[
                _owner
            ];
            for (uint256 q = 0; q < newStakedTokensOfOwner.length; q++) {
                if (newStakedTokensOfOwner[q] == tokenId) {
                    newStakedTokensOfOwner[q] = newStakedTokensOfOwner[
                        newStakedTokensOfOwner.length - 1
                    ];
                }
            }
            _stakedTokensOfOwner[_owner] = newStakedTokensOfOwner;
            _stakedTokensOfOwner[_owner].pop();
            target.safeTransferFrom(address(this), _owner, tokenId);
        }
        emit Withdrawn(_owner, tokenIds);
    }
    function _stakingMultiplierForToken(uint256 _tokenId)
        internal
        view
        returns (uint256)
    {
        return stakedTokenOwners[_tokenId] != address(0) ? boostRate : 1;
    }
    // EVENTS
    event Staked(address indexed user, uint256[] tokenIds);
    event Withdrawn(address indexed user, uint256[] tokenIds);
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
interface ICoreRewarder {
    function stake(
        uint256[] calldata tokenIds
    ) external;
    function withdraw(
        uint256[] calldata tokenIds
    ) external;
    function claim(uint256[] calldata tokenIds) external;
    function earned(uint256[] memory tokenIds)
        external
        view
        returns (uint256);
    function lastClaimTimesOfTokens(uint256[] memory tokenIds)
        external
        view
        returns (uint256[] memory);
    function isOwner(address owner, uint256 tokenId)
        external
        view
        returns (bool);
    function tokensOfOwner(address _owner)
        external
        view
        returns (uint256[] memory);
    function stakedTokensOfOwner(address owner)
        external
        view
        returns (uint256[] memory);
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
interface ICollection {
    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function tokensOfOwner(address _owner)
        external
        view
        returns (uint256[] memory);
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
interface IINT {
    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);
    function mint(address to, uint256 amount) external;
    function burnFrom(address account, uint256 amount) external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
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
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/presets/ERC20PresetMinterPauser.sol)
pragma solidity ^0.8.0;
// ______  __  __   ______       _____    __  __   _____    ______
// /\\__  _\\/\\ \\_\\ \\ /\\  ___\\     /\\  __-. /\\ \\/\\ \\ /\\  __-. /\\  ___\\
// \\/_/\\ \\/\\ \\  __ \\\\ \\  __\\     \\ \\ \\/\\ \\\\ \\ \\_\\ \\\\ \\ \\/\\ \\\\ \\  __\\
//   \\ \\_\\ \\ \\_\\ \\_\\\\ \\_____\\    \\ \\____- \\ \\_____\\\\ \\____- \\ \\_____\\
//    \\/_/  \\/_/\\/_/ \\/_____/     \\/____/  \\/_____/ \\/____/  \\/_____/
//
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
contract INT is Ownable, ERC20Burnable {
    
    mapping(address => bool) public minters;
    constructor() ERC20("interactive", "INT") {}
    function addMinter(address _minter) public onlyOwner {
        minters[_minter] = true;
        emit MinterAdded(_minter);
    }
    function removeMinter(address _minter) public onlyOwner {
        minters[_minter] = false;
        emit MinterRemoved(_minter);
    }
    function mint(address to, uint256 amount) public {
        require(minters[msg.sender], "Only minter can mint");
        _mint(to, amount);
    }
    event MinterAdded(address minter);
    event MinterRemoved(address minter);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Burnable.sol)
pragma solidity ^0.8.0;
import "../ERC20.sol";
import "../../../utils/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
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/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
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)
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: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
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);
}