// SPDX-License-Identifier: MIT
// Website: floppydisknft.com
//                                                                           
//                                     .:                                    
//                                ..^7?Y5?^                                  
//                             .~!?55G5YJYY?^                                
//                         .~~JYYYJ?7YPPYYYYY?^                              
//                     :^!JJJJ??5PGG5?7YPPYYYYY?^                            
//                 :^?JGGJ777YBBGGGGGBP5PG5YYYYYY?^.                         
//            ..^7JBGGGGGPJ!!7YGGGBBBBB55YYYY5YYYYY?^.                       
//         ..~YP555PBBGGGGGPJ7JYGBG55YYYYY5PPPPPYYYYY?^                      
//       .!Y5P5YYYYYYPBBGGBB#PPP5YYYYYPPPPYJ7~!JPPYYYYYJ^                    
//      ^PG55YYYYYYYYYYPGGPPYYYYY55PP5J?!!!7JJ!~!JPP5YYYYJ^.                 
//      ~BGPP55YYYYYYYYYYYYYY55PP5Y?~~!!JY5555P~^~!JPP5YYYYJ~.               
//      .^YGGPP55YYYYYYYYY5PP5Y7!!~7JY5PY55YYJ!~!J!~!JPGBPYYYJ~.             
//         ^YGGPP5YYYYYYYPPJ!~^~?YP5YPY55?7!7?J55YG7^~!JGG5YYYYJ~.           
//           ^JGGPP5YYYYYY5P57~~5555Y?7~7?Y555PY55?~^^^~!JPP555PBY.          
//             ^JGGPP55YYYYY5P57~77~~?55YP555Y??~~^^^^^^~!?GGGBBB5.          
//               ^JGGGP55YYYYY5P57~^7GYP5YJ7~~^^^^^^~!7Y5GBBBB5?!.           
//                 ^JGGGP55YYYYY5P5?~7J!!~^^^^^~~~?J5GBBBGYJ~:.              
//                   ^JGGGP55YYYYPBB5?~^^^^~~!?JPGBBBG5J^:                   
//                     ^JPGGP55YYY555P5?~77YPPBBBPP7~:                       
//                       ^?GGGP55YYYY5PBPGBBBG5!!.                           
//                         :?PGGP5PPGBBBBGJ7~..                              
//                           :?PGBBBBGJ?^:.                                  
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//  

// File @openzeppelin/contracts/utils/introspection/IERC165.sol@v4.4.1

// 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 @openzeppelin/contracts/token/ERC721/IERC721.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @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;
}


// File @openzeppelin/contracts/utils/Context.sol@v4.4.1

// 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;
    }
}


// File @openzeppelin/contracts/access/Ownable.sol@v4.4.1

// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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);
    }
}


// File contracts/interfaces/IStorageToken.sol

pragma solidity ^0.8.4;

interface IStorageToken {
  function mint(address to, uint256 amount) external;

  function consume(address spender, uint256 amount) external;
}


// File contracts/FulfillmentCenter.sol

pragma solidity ^0.8.4;



contract FulfillmentCenter is Ownable {
  IERC721 public immutable floppyDisk;
  IStorageToken public immutable storageToken;

  bool public paused;

  uint256 public currentReward; // How much storage per floppy
  uint256 public totalReward; // Current cumulative amount distributed
  uint256 public maxReward; // Max reward that will be fulfilled

  mapping(uint256 => bool) public rewardClaimed;

  constructor(
    address _floppyDisk,
    address _storageToken,
    uint256 _currentReward,
    uint256 _maxReward
  ) {
    floppyDisk = IERC721(_floppyDisk);
    storageToken = IStorageToken(_storageToken);
    currentReward = _currentReward;
    maxReward = _maxReward;
  }

  function claimRewards(uint256[] calldata tokenIds) public {
    require(!paused, "Paused");
    uint256 rewards;
    for (uint256 i = 0; i < tokenIds.length; i++) {
      uint256 tokenId = tokenIds[i];
      require(!rewardClaimed[tokenId], "Reward claimed");
      require(floppyDisk.ownerOf(tokenId) == msg.sender, "Not owner of token");
      rewardClaimed[tokenId] = true;
      rewards += currentReward;
    }
    storageToken.mint(msg.sender, rewards);
    totalReward += rewards;
    require(totalReward <= maxReward, "Exceed max reward");
  }

  function setReward(uint256 _currentReward, uint256 _maxReward)
    public
    onlyOwner
  {
    currentReward = _currentReward;
    maxReward = _maxReward;
  }

  function setPaused(bool _paused) public onlyOwner {
    paused = _paused;
  }
}