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// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";

///̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶//
//                                                                   //
//    ┌───────────────┐                       ┌────────────────┐     //
//    │               │                       │                │     //
//    │               │      safeTransfer     │                │     //
//    │      NFT      │  ──────────────────►  │    AUCTIONS    │     //
//    │               │                       │                │     //
//    │               │                       │                │     //
//    └───────────────┘                       └────────────────┘     //
//                                                                   //
//  ───────────────────────────────────────────────────────────────  //
//                                                                   //
//                         24 Hour Auction                           //
//                      5 Minute Grace Period                        //
//                  min(+10%, 1 Ether) Bid Increase                  //
//                                                                   //
///̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶/̶//

/// @notice You are free to transact.
/// @author Visualize Value
contract Auctions is ERC721Holder, ERC1155Holder {

    /// @notice The data struct for a given auction.
    struct Auction {
        address tokenContract;
        uint256 tokenId;
        uint80  tokenAmount;
        uint16  tokenStandard;
        uint40  endTimestamp;
        bool    settled;
        uint112 latestBid;
        address latestBidder;
        address payable beneficiary;
    }

    /// @notice The auctions are all one day (+ variable bid grace period increments).
    uint40 public immutable AUCTION_DURATION = 24 hours;

    /// @notice Minimum auction duration after a bid in seconds (5 minutes).
    uint40 public immutable BIDDING_GRACE_PERIOD = 5 minutes;

    /// @notice Each bid has to increase by at least 10%
    uint256 public immutable BID_PERCENTAGE_INCREASE = 10;

    /// @notice Mininum bid increases should be capped at 1 Ether.
    uint256 public immutable MAX_BID_INCREASE = 1 ether;

    /// @notice The next auction ID
    uint256 public auctionId;

    /// @dev Each auction is identified by an ID
    mapping(uint256 => Auction) public auctions;

    /// @dev When the automatic refunds of previous bids fail, they are stored in here
    mapping(address => uint256) public balances;

    /// @dev Emitted when an NFT is sent to the contract.
    event AuctionInitialised(
        uint256 indexed auctionId,
        address indexed tokenContract,
        uint256 indexed tokenId,
        uint16  tokenERCStandard,
        uint40  endTimestamp,
        address beneficiary
    );

    /// @dev Emitted when a new bid is entered.
    event Bid(uint256 indexed auctionId, uint256 indexed bid, address indexed from);

    /// @dev Emitted when a new bid is entered within the BIDDING_GRACE_PERIOD.
    event AuctionExtended(uint256 indexed auctionId, uint256 indexed endTimestamp);

    /// @dev Emitted when an auction is settled, the NFT is sent
    //       to the winner and the funds sent to the beneficiary.
    event AuctionSettled(
        uint256 indexed auctionId,
        address indexed winner,
        address indexed beneficiary,
        uint256 amount
    );

    error AuctionNotActive();
    error AuctionAlreadySettled();
    error AuctionDoesNotExist();
    error AuctionNotComplete();
    error FailedWithdrawal();
    error MinimumBidNotMet();
    error NoBalanceToWithdraw();
    error TooManyTokens();

    /// @dev Hook for `safeTransferFrom` of ERC721 tokens to this contract
    /// @param from The address which previously owned the token
    /// @param tokenId The ID of the token being transferred
    /// @param data The auction parameters encoded as: address beneficiary (20 bytes)
    function onERC721Received(
        address, // The (approved) address which initiated the transfer
        address from,
        uint256 tokenId,
        bytes memory data
    ) public override returns (bytes4) {
        address tokenContract = msg.sender;

        _initializeAuction(
            tokenContract,
            tokenId,
            721,
            1,
            _getBeneficiary(data, from)
        );

        return this.onERC721Received.selector;
    }

    /// @dev Hook for `safeTransferFrom` of ERC1155 tokens to this contract
    /// @param from The address which previously owned the token
    /// @param id The ID of the token being transferred
    /// @param value The amount of tokens being transferred
    /// @param data The auction parameters encoded as: address beneficiary (20 bytes)
    function onERC1155Received(
        address, // The (approved) address which initiated the transfer
        address from,
        uint256 id,
        uint256 value,
        bytes memory data
    ) public override returns (bytes4) {
        if (value >= type(uint80).max) revert TooManyTokens();

        address tokenContract = msg.sender;

        _initializeAuction(
            tokenContract,
            id,
            1155,
            uint80(value),
            _getBeneficiary(data, from)
        );

        return this.onERC1155Received.selector;
    }

    /// @dev The minimum value of the next bid for an auction.
    function currentBidPrice(uint256 id) external view returns (uint256) {
        return _currentBidPrice(auctions[id]);
    }

    /// @dev Enter a new bid
    /// @param id The Auction ID to bid on
    function bid(uint256 id) external payable {
        Auction storage auction = auctions[id];

        address previousBidder = auction.latestBidder;
        uint256 previousValue  = auction.latestBid;
        address bidder         = msg.sender;
        uint256 value          = msg.value;

        if (value < _currentBidPrice(auction)) revert MinimumBidNotMet();
        if (block.timestamp > auction.endTimestamp) revert AuctionNotActive();

        _maybeExtendTime(id, auction);

        // Store the bid
        auction.latestBid    = uint112(value);
        auction.latestBidder = bidder;

        // Pay back previous bidder
        if (_hasBid(auction)) {
            (bool success,) = payable(previousBidder).call{value: previousValue, gas: 60_000}("");
            if (!success) {
                balances[previousBidder] += previousValue;
            }
        }

        emit Bid(id, value, bidder);
    }

    /// @dev Settles an auction
    /// @param id The Auction ID to claim.
    function settle(uint256 id) external {
        Auction storage auction = auctions[id];

        if (auction.settled) revert AuctionAlreadySettled();
        if (auction.endTimestamp == 0) revert AuctionDoesNotExist();
        if (block.timestamp <= auction.endTimestamp) revert AuctionNotComplete();

        bool hasBid = _hasBid(auction);
        address winner = hasBid ? auction.latestBidder : auction.beneficiary;

        // Mark the auction as settled.
        auction.settled = true;

        // Send the funds to the beneficiary if there was a bid
        if (hasBid) {
            (bool success,) = auction.beneficiary.call{value: auction.latestBid, gas: 60_000}("");
            if (!success) {
                balances[auction.beneficiary] += auction.latestBid;
            }
        }

        // Transfer the NFT to the winner
        if (auction.tokenStandard == 721) {
            IERC721(auction.tokenContract).safeTransferFrom(
                address(this),
                winner,
                auction.tokenId,
                ""
            );
        } else if (auction.tokenStandard == 1155) {
            IERC1155(auction.tokenContract).safeTransferFrom(
                address(this),
                winner,
                auction.tokenId,
                auction.tokenAmount,
                ""
            );
        }

        emit AuctionSettled(id, winner, auction.beneficiary, auction.latestBid);
    }

    /// @dev Withdraw user balance in case automatic refund in bid failed.
    function withdraw() external {
        uint256 amount = balances[msg.sender];
        if (amount == 0) revert NoBalanceToWithdraw();

        // Set balance to zero because it could be called again in receive before call returns
        balances[msg.sender] = 0;
        (bool success,) = payable(msg.sender).call{value: amount}("");
        if (!success) revert FailedWithdrawal();
    }

    /// @dev Decode auction parameters from token transfer data
    /// @param data Encoded auction parameters: address beneficiary (20 bytes)
    function _getBeneficiary(bytes memory data, address defaultBeneficiary) internal pure returns (address payable) {
        if (data.length == 32) {
            address beneficiary = abi.decode(data, (address));

            if (beneficiary != address(0)) {
                return payable(beneficiary);
            }
        }

        return payable(defaultBeneficiary);
    }

    /// @dev Initializes an auction
    function _initializeAuction(
        address tokenContract,
        uint256 tokenId,
        uint16  tokenStandard,
        uint80  tokenAmount,
        address payable beneficiary
    ) internal {
        auctionId++;

        uint40 endTimestamp = uint40(block.timestamp + AUCTION_DURATION);

        Auction storage auction = auctions[auctionId];

        auction.tokenContract = tokenContract;
        auction.tokenId       = tokenId;
        auction.tokenAmount   = tokenAmount;
        auction.tokenStandard = tokenStandard;
        auction.endTimestamp  = endTimestamp;
        auction.beneficiary   = beneficiary;

        emit AuctionInitialised(
            auctionId,
            tokenContract,
            tokenId,
            tokenStandard,
            endTimestamp,
            beneficiary
        );
    }

    /// @dev Extends the end time of an auction if we are within the grace period.
    function _maybeExtendTime(uint256 id, Auction storage auction) internal {
        uint40 gracePeriodStart = auction.endTimestamp - BIDDING_GRACE_PERIOD;
        uint40 _now = uint40(block.timestamp);
        if (_now > gracePeriodStart) {
            auction.endTimestamp = _now + BIDDING_GRACE_PERIOD;
            emit AuctionExtended(id, auction.endTimestamp);
        }
    }

    /// @dev Calculates the minimum price for the next bid
    function _currentBidPrice(Auction memory auction) internal view returns (uint256) {
        if (!_hasBid(auction)) return _getMinimumBid();

        uint256 latestBid = uint256(auction.latestBid);
        uint256 percentageIncrease = latestBid * BID_PERCENTAGE_INCREASE / 100;

        uint256 increase = percentageIncrease < MAX_BID_INCREASE
            ? percentageIncrease
            : MAX_BID_INCREASE;

        return latestBid + increase;
    }

    /// @dev Whether an auction has an existing bid
    function _hasBid(Auction memory auction) internal pure returns (bool) {
        return auction.latestBid > 0;
    }

    /// @dev Calculate the minimum bid based on current network conditions (based on VV Mint prices)
    function _getMinimumBid() internal view returns (uint256) {
        return block.basefee * 60_000;
    }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC-1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[ERC].
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` amount of tokens of type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the value of tokens of token type `id` owned by `account`.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(
        address[] calldata accounts,
        uint256[] calldata ids
    ) external view returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the zero address.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers a `value` amount of tokens of type `id` from `from` to `to`.
     *
     * WARNING: This function can potentially allow a reentrancy attack when transferring tokens
     * to an untrusted contract, when invoking {onERC1155Received} on the receiver.
     * Ensure to follow the checks-effects-interactions pattern and consider employing
     * reentrancy guards when interacting with untrusted contracts.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `value` amount.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(address from, address to, uint256 id, uint256 value, bytes calldata data) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * WARNING: This function can potentially allow a reentrancy attack when transferring tokens
     * to an untrusted contract, when invoking {onERC1155BatchReceived} on the receiver.
     * Ensure to follow the checks-effects-interactions pattern and consider employing
     * reentrancy guards when interacting with untrusted contracts.
     *
     * Emits either a {TransferSingle} or a {TransferBatch} event, depending on the length of the array arguments.
     *
     * Requirements:
     *
     * - `ids` and `values` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../../utils/introspection/IERC165.sol";

/**
 * @dev Interface that must be implemented by smart contracts in order to receive
 * ERC-1155 token transfers.
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC-1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC-1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC1155/utils/ERC1155Holder.sol)

pragma solidity ^0.8.20;

import {IERC165, ERC165} from "../../../utils/introspection/ERC165.sol";
import {IERC1155Receiver} from "../IERC1155Receiver.sol";

/**
 * @dev Simple implementation of `IERC1155Receiver` that will allow a contract to hold ERC-1155 tokens.
 *
 * IMPORTANT: When inheriting this contract, you must include a way to use the received tokens, otherwise they will be
 * stuck.
 */
abstract contract ERC1155Holder is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
    }

    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(
        address,
        address,
        uint256[] memory,
        uint256[] memory,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC-721 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 ERC-721 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 ERC-721
     * 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 address zero.
     *
     * 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 v5.1.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.20;

/**
 * @title ERC-721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC-721 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 (last updated v5.0.0) (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.20;

import {IERC721Receiver} from "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or
 * {IERC721-setApprovalForAll}.
 */
abstract contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(address, address, uint256, bytes memory) public virtual returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"name":"AuctionAlreadySettled","type":"error"},{"inputs":[],"name":"AuctionDoesNotExist","type":"error"},{"inputs":[],"name":"AuctionNotActive","type":"error"},{"inputs":[],"name":"AuctionNotComplete","type":"error"},{"inputs":[],"name":"FailedWithdrawal","type":"error"},{"inputs":[],"name":"MinimumBidNotMet","type":"error"},{"inputs":[],"name":"NoBalanceToWithdraw","type":"error"},{"inputs":[],"name":"TooManyTokens","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"auctionId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"endTimestamp","type":"uint256"}],"name":"AuctionExtended","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"auctionId","type":"uint256"},{"indexed":true,"internalType":"address","name":"tokenContract","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint16","name":"tokenERCStandard","type":"uint16"},{"indexed":false,"internalType":"uint40","name":"endTimestamp","type":"uint40"},{"indexed":false,"internalType":"address","name":"beneficiary","type":"address"}],"name":"AuctionInitialised","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"auctionId","type":"uint256"},{"indexed":true,"internalType":"address","name":"winner","type":"address"},{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"AuctionSettled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"auctionId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"bid","type":"uint256"},{"indexed":true,"internalType":"address","name":"from","type":"address"}],"name":"Bid","type":"event"},{"inputs":[],"name":"AUCTION_DURATION","outputs":[{"internalType":"uint40","name":"","type":"uint40"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"BIDDING_GRACE_PERIOD","outputs":[{"internalType":"uint40","name":"","type":"uint40"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"BID_PERCENTAGE_INCREASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_BID_INCREASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"auctionId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"auctions","outputs":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint80","name":"tokenAmount","type":"uint80"},{"internalType":"uint16","name":"tokenStandard","type":"uint16"},{"internalType":"uint40","name":"endTimestamp","type":"uint40"},{"internalType":"bool","name":"settled","type":"bool"},{"internalType":"uint112","name":"latestBid","type":"uint112"},{"internalType":"address","name":"latestBidder","type":"address"},{"internalType":"address payable","name":"beneficiary","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"bid","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"name":"currentBidPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","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":"id","type":"uint256"}],"name":"settle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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