// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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`.
     *
     * 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;

    /**
     * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * 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 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 the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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);
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// 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);
}

// File: contracts/IClaimer.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

interface IClaimer {
    function registerToken(uint256 tokenId) external;
}

// File: contracts/KEYSClaimer.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

//import "hardhat/console.sol";

import "contracts/lib/IMintableNft.sol";
import "contracts/IClaimer.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "contracts/lib/Ownable.sol";

struct NftData {
    uint256 reward;
    bool claimed;
}

contract KEYSClaimer is Ownable, IClaimer {
    IMintableNft public nft;
    IERC20 public erc20;
    uint256 public rewardPool;
    uint256 public totalRewarded;
    uint256 constant maxRewardShare = 100; // maximum reward share of rewardPool in 1/maxRewardShareDecimals
    uint256 constant maxRewardShareDecimals = 150000;

    int256 _zeroValue;
    mapping(uint256 => NftData) _data;

    constructor(address nftAddress, address erc20Address) {
        nft = IMintableNft(nftAddress);
        erc20 = IERC20(erc20Address);
    }

    function claim(uint256 tokenId) external {
        require(
            nft.ownerOf(tokenId) == msg.sender,
            "only owner of token can claim"
        );
        require(
            nft.ownerOf(tokenId) == msg.sender,
            "only owner of nft can claim"
        );
        require(!_data[tokenId].claimed, "already claimed");

        _data[tokenId].claimed = true;

        erc20.transfer(msg.sender, this.reward(tokenId));
    }

    function registerToken(uint256 tokenId) external {
        require(msg.sender == address(nft), "only for nft");
        require(rewardPool > 0, "not started");

        _data[tokenId].reward = (block.timestamp * tokenId) % maxRewardShare;

        totalRewarded += this.reward(tokenId);
    }

    function start() external onlyOwner {
        rewardPool = erc20.balanceOf(address(this));
        _zeroValue = int256(rewardPool / nft.maxMintCount());
    }

    function zeroValue() external view returns (uint256) {
        return uint256(_zeroValue);
    }

    function lapsedReward() external view returns (uint256) {
        return rewardPool - totalRewarded;
    }

    function isClaimed(uint256 tokenId) external view returns (bool) {
        return _data[tokenId].claimed;
    }

    function reward(uint256 tokenId) external view returns (uint256) {
        return (rewardPool * _data[tokenId].reward) / maxRewardShareDecimals;
    }

    function rewardShare(uint256 tokenId) external view returns (uint256) {
        return _data[tokenId].reward;
    }

    function withdraw() external onlyOwner {
        erc20.transfer(msg.sender, erc20.balanceOf(address(this)));
    }
}

// File: contracts/lib/IMintableNft.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

interface IMintableNft is IERC721 {
    function mint(address to) external;

    function maxMintCount() external pure returns (uint256);
}

// File: contracts/lib/IOwnable.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

interface IOwnable {
    function owner() external view returns (address);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function transferOwnership(address newOwner) external;
}

// File: contracts/lib/Ownable.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import "./IOwnable.sol";

contract Ownable is IOwnable {
    address _owner;

    constructor() {
        _owner = msg.sender;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "caller is not the owner");
        _;
    }

    function owner() external view virtual returns (address) {
        return _owner;
    }

    function transferOwnership(address newOwner) external onlyOwner {
        address lastOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(lastOwner, newOwner);
    }

    function removeOwner() external onlyOwner {
        address lastOwner = _owner;
        _owner = address(0);
        emit OwnershipTransferred(lastOwner, _owner);
    }
}