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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {ERC721Holder} from "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";

/// @title Auction
/// @author VisualizeValue
/// @notice Single ERC721 auction with concierge bidding, exact 10% bid increments, and configurable time extension.
/// @dev NFT must be transferred to this contract separately after deployment.
contract Auction is Ownable, ERC721Holder {
    // ============ Errors ============

    error AuctionNotStarted();
    error AuctionEnded();
    error AuctionNotEnded();
    error AuctionAlreadySettled();
    error InvalidBidAmount(uint256 required, uint256 provided);
    error InvalidAddress();
    error NoBalanceToWithdraw();
    error WithdrawalFailed();
    error NoProceedsToWithdraw();
    error ProceedsAlreadyWithdrawn();
    error InvalidConfiguration();
    error AuctionAlreadyStarted();
    error NFTNotEscrowed();

    // ============ Events ============

    /// @dev Emitted when a bid is placed (either ETH or concierge).
    /// @param bidder The address credited as the bidder.
    /// @param amount The bid amount.
    /// @param isConcierge True if this was a concierge bid (no ETH transferred).
    event Bid(address indexed bidder, uint256 amount, bool isConcierge);

    /// @dev Emitted when auction end time is extended.
    event AuctionExtended(uint40 newEndTimestamp);

    /// @dev Emitted when auction is settled and NFT transferred.
    event AuctionSettled(address indexed winner, uint256 winningBid);

    /// @dev Emitted when a bidder withdraws their failed refund balance.
    event Withdrawal(address indexed account, uint256 amount);

    /// @dev Emitted when owner withdraws auction proceeds.
    event ProceedsWithdrawn(address indexed recipient, uint256 amount);

    /// @dev Emitted when auction is started by owner.
    event AuctionStarted(uint40 endTimestamp);

    // ============ Immutable Configuration ============

    /// @notice The ERC721 contract address.
    IERC721 public immutable nftContract;

    /// @notice The token ID being auctioned.
    uint256 public immutable tokenId;

    /// @notice Initial end timestamp (before any extensions).
    uint40 public immutable initialEndTimestamp;

    /// @notice Starting bid amount (first bid must be exactly this).
    uint128 public immutable startingBid;

    /// @notice Time extension when bid arrives within this period before end.
    uint40 public immutable bidExtensionDelay;

    /// @notice Address that can bid without sending ETH (for off-chain payments).
    address public immutable concierge;

    // ============ Mutable State ============

    /// @notice Whether the auction has been started.
    bool public started;

    /// @notice Current end timestamp (may be extended by late bids).
    uint40 public endTimestamp;

    /// @notice Current highest bid amount.
    uint128 public highestBid;

    /// @notice Current highest bidder address.
    address public highestBidder;

    /// @notice Whether the current highest bid was placed by concierge (no ETH).
    bool public highestBidIsConcierge;

    /// @notice Whether the auction has been settled.
    bool public settled;

    /// @notice Whether the proceeds have been withdrawn.
    bool public proceedsWithdrawn;

    /// @notice Fallback balances for failed refunds (DOS protection).
    mapping(address => uint256) public balances;

    // ============ Constructor ============

    /// @param _owner Contract owner (receives proceeds).
    /// @param _concierge Concierge address for off-chain payment bids.
    /// @param _nftContract ERC721 contract address.
    /// @param _tokenId Token ID to auction.
    /// @param _endTimestamp Initial auction end time (once started).
    /// @param _startingBid First bid must equal this amount.
    /// @param _bidExtensionDelay Extension period (e.g., 1 hour = 3600).
    constructor(
        address _owner,
        address _concierge,
        address _nftContract,
        uint256 _tokenId,
        uint40 _endTimestamp,
        uint128 _startingBid,
        uint40 _bidExtensionDelay
    ) Ownable(_owner) {
        if (_nftContract == address(0)) revert InvalidAddress();
        if (_concierge == address(0)) revert InvalidAddress();
        if (_endTimestamp == 0) revert InvalidConfiguration();
        if (_startingBid == 0) revert InvalidConfiguration();
        if (_bidExtensionDelay == 0) revert InvalidConfiguration();

        nftContract = IERC721(_nftContract);
        tokenId = _tokenId;
        initialEndTimestamp = _endTimestamp;
        endTimestamp = _endTimestamp;
        startingBid = _startingBid;
        bidExtensionDelay = _bidExtensionDelay;
        concierge = _concierge;
    }

    // ============ Start Function ============

    /// @notice Starts the auction. Only callable by owner.
    function start() external onlyOwner {
        if (started) revert AuctionAlreadyStarted();
        if (nftContract.ownerOf(tokenId) != address(this)) revert NFTNotEscrowed();

        started = true;

        emit AuctionStarted(endTimestamp);
    }

    // ============ Bidding Functions ============

    /// @notice Place a bid. Regular bidders must send exact ETH amount.
    ///         Concierge can bid without ETH (for off-chain payments).
    /// @dev Refunds previous bidder with 60k gas limit for DOS protection.
    function bid() external payable {
        if (!started) revert AuctionNotStarted();
        if (block.timestamp >= endTimestamp) revert AuctionEnded();
        if (settled) revert AuctionAlreadySettled();

        uint256 required = nextValidBid();
        bool isConcierge = msg.sender == concierge;

        if (!isConcierge && msg.value != required) {
            revert InvalidBidAmount(required, msg.value);
        }

        address previousBidder = highestBidder;
        uint256 previousBid = highestBid;
        bool previousWasConcierge = highestBidIsConcierge;

        // Update state BEFORE external calls (CEI pattern)
        highestBidder = msg.sender;
        highestBid = uint128(required);
        highestBidIsConcierge = isConcierge;

        // Extend auction if within extension period
        _maybeExtendAuction();

        // Refund previous bidder (only if they paid ETH)
        if (previousBidder != address(0) && !previousWasConcierge) {
            (bool success,) = payable(previousBidder).call{value: previousBid, gas: 60_000}("");
            if (!success) {
                balances[previousBidder] += previousBid;
            }
        }

        emit Bid(msg.sender, required, isConcierge);
    }

    // ============ View Functions ============

    /// @notice Returns the exact amount required for the next valid bid.
    /// @return The next valid bid amount in wei.
    function nextValidBid() public view returns (uint256) {
        if (highestBid == 0) {
            return startingBid;
        }
        // Exactly 10% increase
        return (uint256(highestBid) * 110) / 100;
    }

    /// @notice Returns current auction status.
    function auctionStatus()
        external
        view
        returns (
            bool isActive,
            bool hasStarted,
            bool hasEnded,
            uint256 currentBid,
            address currentBidder,
            uint256 nextBid,
            uint40 timeRemaining
        )
    {
        hasStarted = started;
        hasEnded = (started && block.timestamp >= endTimestamp) || settled;
        isActive = hasStarted && !hasEnded;
        currentBid = highestBid;
        currentBidder = highestBidder;
        nextBid = nextValidBid();
        timeRemaining = (started && block.timestamp < endTimestamp) ? endTimestamp - uint40(block.timestamp) : 0;
    }

    // ============ Settlement ============

    /// @notice Settles the auction after it ends. Transfers NFT to winner.
    /// @dev Anyone can call this after auction ends.
    function settle() external {
        if (settled) revert AuctionAlreadySettled();
        if (!started || block.timestamp < endTimestamp) revert AuctionNotEnded();

        settled = true;

        address winner;
        if (highestBidder != address(0)) {
            winner = highestBidder;
        } else {
            // No bids - return NFT to owner
            winner = owner();
        }

        // Transfer NFT to winner
        nftContract.safeTransferFrom(address(this), winner, tokenId);

        emit AuctionSettled(winner, highestBid);
    }

    // ============ Withdrawal Functions ============

    /// @notice Withdraw failed refund balance (pull pattern for DOS protection).
    function withdraw() external {
        uint256 amount = balances[msg.sender];
        if (amount == 0) revert NoBalanceToWithdraw();

        // Set balance to zero before external call (reentrancy guard)
        balances[msg.sender] = 0;

        (bool success,) = payable(msg.sender).call{value: amount}("");
        if (!success) revert WithdrawalFailed();

        emit Withdrawal(msg.sender, amount);
    }

    /// @notice Owner withdraws auction proceeds after settlement.
    /// @dev Only callable after settlement. Only withdraws the winning bid amount.
    function withdrawProceeds() external onlyOwner {
        if (!settled) revert AuctionNotEnded();
        if (proceedsWithdrawn) revert ProceedsAlreadyWithdrawn();

        // Only withdraw the winning bid amount (not failed refund balances)
        // Concierge bids don't have ETH to withdraw
        uint256 amount = highestBidIsConcierge ? 0 : uint256(highestBid);
        if (amount == 0) revert NoProceedsToWithdraw();

        proceedsWithdrawn = true;

        (bool success,) = payable(owner()).call{value: amount}("");
        if (!success) revert WithdrawalFailed();

        emit ProceedsWithdrawn(owner(), amount);
    }

    // ============ Internal Functions ============

    /// @dev Extends auction end time if current bid is within extension window.
    function _maybeExtendAuction() private {
        if (block.timestamp >= endTimestamp - bidExtensionDelay) {
            endTimestamp = uint40(block.timestamp) + bidExtensionDelay;
            emit AuctionExtended(endTimestamp);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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 (last updated v5.4.0) (token/ERC721/IERC721.sol)

pragma solidity >=0.6.2;

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 v5.4.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity >=0.5.0;

/**
 * @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 v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @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);
}

{
  "evmVersion": "cancun",
  "optimizer": {
    "enabled": true,
    "runs": 95000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": [
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/",
    "project/:@openzeppelin/contracts/=npm/@openzeppelin/[email protected]/"
  ]
}

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000000000000000000000000c9979381750d5325378cbe36177e7ab037d87ce1000000000000000000000000c9979381750d5325378cbe36177e7ab037d87ce1000000000000000000000000346f28614274cb868b48986454d2eb738c13dcea0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006935b290000000000000000000000000000000000000000000000000000110d9316ec0000000000000000000000000000000000000000000000000000000000000000e10

-----Decoded View---------------
Arg [0] : _owner (address): 0xC9979381750d5325378CBE36177E7aB037D87CE1
Arg [1] : _concierge (address): 0xC9979381750d5325378CBE36177E7aB037D87CE1
Arg [2] : _nftContract (address): 0x346f28614274Cb868B48986454D2EB738c13dCEa
Arg [3] : _tokenId (uint256): 0
Arg [4] : _endTimestamp (uint40): 1765126800
Arg [5] : _startingBid (uint128): 300000000000000
Arg [6] : _bidExtensionDelay (uint40): 3600

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000c9979381750d5325378cbe36177e7ab037d87ce1
Arg [1] : 000000000000000000000000c9979381750d5325378cbe36177e7ab037d87ce1
Arg [2] : 000000000000000000000000346f28614274cb868b48986454d2eb738c13dcea
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 000000000000000000000000000000000000000000000000000000006935b290
Arg [5] : 000000000000000000000000000000000000000000000000000110d9316ec000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000e10