// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "./interfaces/IAdventureEventProxyV1.sol";
import "./interfaces/IAdventureV1.sol";
import "../interfaces/IWithdrawableV1.sol";
import "../interfaces/IRewardsReceiver.sol";

/// @dev Not super efficient yet because implementation is redeployed every time, could be
///      improved by using a proxy contract. Ok on Nova for now.
contract AdventureV1 is IAdventureV1, IERC721Receiver, IWithdrawableV1 {
    struct Participant {
        address owner;
        uint256 enteredAt;
    }

    /****************************
     * VARIABLES *
     ***************************/

    IAdventureV1.AdventureConfig public config;
    IERC721 public monsters;

    IAdventureEventProxyV1 public eventProxy; // Contract that emits events (makes processing from outside easier)
    IRewardsReceiver public rewardsReceiver; // Contract that receives the rewards (or splits to more contracts)
    IERC721 public monsterCollection; // Operator that is allowed to transfer monsters from this contract

    address public configurator; // Address that can update the config of the adventure
    uint256 public finalizationRandomness; // Will decide on adventure rewards
    uint256[] public participants; // Participants of the adventure (monster tokenIds)

    uint256 public lastMonsterJoined; // Flag to indicate if the last monster has joined the adventure
    uint256 public firstMonsterWithdrawn; // Flag to indicate if the first monster has withdrawn

    /****************************
     * MAPPINGS *
     ***************************/

    mapping(uint256 => Participant) public participantsByTokenId; // Mapping of tokenId to participant

    /****************************
     * ERRORS *
     ***************************/
    error AdventureAlreadyStarted();
    error AdventureInTheFuture();
    error AdventureNotOver();
    error AlreadyInitialized();
    error AlreadyParticipated();
    error InvalidPmonAmount();
    error Unauthorized();
    error Unexpected();

    /****************************
     * MODIFIERS *
     ***************************/
    modifier onlyConfigurator() {
        if (msg.sender != configurator) {
            revert Unauthorized();
        }
        _;
    }

    function initialize(
        address _pmon,
        address _monsters,
        address _rewardsReceiver,
        address _eventProxy,
        address _configurator,
        IAdventureV1.AdventureConfig memory _config
    ) external override {
        if (address(monsterCollection) != address(0)) {
            revert AlreadyInitialized();
        }

        monsters = IERC721(_monsters);
        rewardsReceiver = IRewardsReceiver(_rewardsReceiver);
        eventProxy = IAdventureEventProxyV1(_eventProxy);
        configurator = _configurator;
        config = _config;

        IERC20(_pmon).approve(address(_rewardsReceiver), type(uint256).max);
    }

    // Function to receive ERC721 tokens
    function onERC721Received(
        address,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4) {
        // we only accept ERC721 tokens from the monster collection
        if (msg.sender != address(monsters)) {
            revert Unauthorized();
        }

        // check if we really have the token
        if (monsters.ownerOf(tokenId) != address(this)) {
            revert Unexpected();
        }

        if (block.number >= config.startBlock) {
            if (lastMonsterJoined != 0) {
                revert AdventureAlreadyStarted();
            }

            uint256 pseudoRandomness = uint256(
                keccak256(
                    abi.encodePacked(blockhash(block.number - 1), address(this))
                )
            );

            uint256 adventureDuration = (pseudoRandomness %
                (config.durationUpperBound - config.durationLowerBound)) +
                config.durationLowerBound;

            uint256 endBlock = config.startBlock + adventureDuration;

            config.endBlock = endBlock;

            eventProxy.emitEvent(
                IAdventureEventProxyV1.AdventureEventType.AdventureEndDateSet,
                abi.encode(endBlock),
                "",
                "",
                ""
            );

            lastMonsterJoined = tokenId;
        }

        /// @dev we could also verify the exact pmon balance in this contract but we rely on the
        ///      functionality of the operator for now
        uint256 pmonAmount = abi.decode(data, (uint256));
        if (pmonAmount != config.pmonFee) {
            revert InvalidPmonAmount();
        }

        /// @dev The reward receiver will potentially also crash if no actual pmon are sent
        rewardsReceiver.addRewards(pmonAmount);

        if (participantsByTokenId[tokenId].owner != address(0)) {
            revert AlreadyParticipated();
        }

        participantsByTokenId[tokenId] = Participant(from, block.timestamp);
        participants.push(tokenId);

        if (participants.length != monsters.balanceOf(address(this))) {
            revert Unexpected();
        }

        return this.onERC721Received.selector;
    }

    function withdrawMonster(address to, uint256 tokenId) external override {
        if (config.endBlock == 0) {
            revert AdventureInTheFuture();
        }

        if (block.number < config.endBlock) {
            revert AdventureNotOver();
        }

        // check the NFT actually belongs to the user
        if (participantsByTokenId[tokenId].owner != to) {
            revert Unauthorized();
        }

        if (firstMonsterWithdrawn == 0) {
            firstMonsterWithdrawn = tokenId;

            eventProxy.emitEvent(
                IAdventureEventProxyV1
                    .AdventureEventType
                    .AdventureFinalizationRequested,
                abi.encode(tokenId),
                "",
                "",
                ""
            );
        } else {
            monsters.transferFrom(address(this), to, tokenId);
        }
    }

    /****************************
     * CONFIGURATOR FUNCTIONS *
     ***************************/

    function finalize(uint256 randomness) external override onlyConfigurator {
        if (config.endBlock == 0 || firstMonsterWithdrawn == 0) {
            /// @dev endBlock should be set first
            revert Unexpected();
        }

        finalizationRandomness = randomness;

        monsters.transferFrom(
            address(this),
            participantsByTokenId[firstMonsterWithdrawn].owner,
            firstMonsterWithdrawn
        );
    }

    function setEndBlock(uint256 endBlock) external override onlyConfigurator {
        config.endBlock = endBlock;
    }

    /****************************
     * PUBLIC VIEW FUNCTIONS *
     ***************************/

    function getConfig()
        external
        view
        override
        returns (IAdventureV1.AdventureConfig memory)
    {
        return config;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.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 (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
pragma solidity 0.8.18;

interface IAdventureEventProxyV1 {
    enum AdventureEventType {
        AdventureRevealRequested,
        AdventureFinalizationRequested,
        AdventureEndDateSet,
        AdventureRevealed
    }

    function emitEvent(
        AdventureEventType eventType,
        bytes calldata arg2,
        bytes calldata arg3,
        bytes calldata arg4,
        bytes calldata arg5
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

interface IAdventureV1 {
    struct AdventureConfig {
        uint256 gatheringBlock;
        uint256 startBlock;
        uint256 endBlock;
        uint256 pmonFee;
        uint256 durationLowerBound;
        uint256 durationUpperBound;
    }

    event MonsterReceived(uint256 indexed adventureId, uint256 indexed tokenId);

    function getConfig() external view returns (AdventureConfig memory);

    function initialize(
        address _monsters,
        address _pmon,
        address _rewardsReceiver,
        address _eventProxy,
        address _configurator,
        IAdventureV1.AdventureConfig memory _config
    ) external;

    function setEndBlock(uint256 endBlock) external;

    function finalize(uint256 randomness) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

interface IRewardsReceiver {
    function addRewards(uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

/// @dev Interface mainly for adventures, battles and other monster gamification contracts.
interface IWithdrawableV1 {
    function withdrawMonster(address to, uint256 tokenId) external;
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

[{"inputs":[],"name":"AdventureAlreadyStarted","type":"error"},{"inputs":[],"name":"AdventureInTheFuture","type":"error"},{"inputs":[],"name":"AdventureNotOver","type":"error"},{"inputs":[],"name":"AlreadyInitialized","type":"error"},{"inputs":[],"name":"AlreadyParticipated","type":"error"},{"inputs":[],"name":"InvalidPmonAmount","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"inputs":[],"name":"Unexpected","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"adventureId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"MonsterReceived","type":"event"},{"inputs":[],"name":"config","outputs":[{"internalType":"uint256","name":"gatheringBlock","type":"uint256"},{"internalType":"uint256","name":"startBlock","type":"uint256"},{"internalType":"uint256","name":"endBlock","type":"uint256"},{"internalType":"uint256","name":"pmonFee","type":"uint256"},{"internalType":"uint256","name":"durationLowerBound","type":"uint256"},{"internalType":"uint256","name":"durationUpperBound","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"configurator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"eventProxy","outputs":[{"internalType":"contract IAdventureEventProxyV1","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"finalizationRandomness","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"randomness","type":"uint256"}],"name":"finalize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"firstMonsterWithdrawn","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getConfig","outputs":[{"components":[{"internalType":"uint256","name":"gatheringBlock","type":"uint256"},{"internalType":"uint256","name":"startBlock","type":"uint256"},{"internalType":"uint256","name":"endBlock","type":"uint256"},{"internalType":"uint256","name":"pmonFee","type":"uint256"},{"internalType":"uint256","name":"durationLowerBound","type":"uint256"},{"internalType":"uint256","name":"durationUpperBound","type":"uint256"}],"internalType":"struct IAdventureV1.AdventureConfig","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_pmon","type":"address"},{"internalType":"address","name":"_monsters","type":"address"},{"internalType":"address","name":"_rewardsReceiver","type":"address"},{"internalType":"address","name":"_eventProxy","type":"address"},{"internalType":"address","name":"_configurator","type":"address"},{"components":[{"internalType":"uint256","name":"gatheringBlock","type":"uint256"},{"internalType":"uint256","name":"startBlock","type":"uint256"},{"internalType":"uint256","name":"endBlock","type":"uint256"},{"internalType":"uint256","name":"pmonFee","type":"uint256"},{"internalType":"uint256","name":"durationLowerBound","type":"uint256"},{"internalType":"uint256","name":"durationUpperBound","type":"uint256"}],"internalType":"struct IAdventureV1.AdventureConfig","name":"_config","type":"tuple"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"lastMonsterJoined","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"monsterCollection","outputs":[{"internalType":"contract IERC721","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"monsters","outputs":[{"internalType":"contract IERC721","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"participants","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"participantsByTokenId","outputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"enteredAt","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardsReceiver","outputs":[{"internalType":"contract IRewardsReceiver","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"endBlock","type":"uint256"}],"name":"setEndBlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"withdrawMonster","outputs":[],"stateMutability":"nonpayable","type":"function"}]