// File: contracts/CelAuction.sol



pragma solidity ^0.8.13;

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

interface IHH {
    function collectFromGateway(uint256 _id, address _owner) external;
}

interface IDR {
    function getPoints(address _owner) external view returns (uint256);
}

contract CelAuction is Ownable {
    using SafeMath for uint256;
    IHH private HH;
    IDR private DR;

    uint256 public bidHeader;
    mapping(uint256 => address) public biddersHistory;
    mapping(uint256 => uint256) public bidHistory;
    uint256 public reservePrice;
    uint256 public percBidIncrement;
    uint256 public auctionEndTime;
    mapping(address => bool) public biddersRedeemed;
    uint256 mintCounter = 10002;
    bool public opened;

    uint256 public constant EXTENSION = 10 minutes;

    event NewHighestBid(address indexed bidder, uint256 amount);

    function bid() external payable {
        require(opened, "Auction is closed.");
        require(block.timestamp < auctionEndTime, "Auction ended.");
        require(DR.getPoints(msg.sender) >= 1, "Not enough Steaks");
        require(msg.value >= getMinBid(), "Bid too low");
        // send previous bid
        if (bidHeader > 0) {
            require(
                payable(biddersHistory[bidHeader]).send(bidHistory[bidHeader])
            );
        }
        bidHeader++;
        bidHistory[bidHeader] = msg.value;
        biddersHistory[bidHeader] = msg.sender;

        if (auctionEndTime.sub(block.timestamp) <= EXTENSION) {
            auctionEndTime = block.timestamp.add(EXTENSION);
        }

        emit NewHighestBid(msg.sender, msg.value);
    }

    function mint() external {
        require(block.timestamp > auctionEndTime, "Auction still going on.");
        require(!biddersRedeemed[msg.sender], "Already redeemed.");
        if (msg.sender == biddersHistory[bidHeader]) {
            require(
                msg.sender == biddersHistory[bidHeader],
                "You are not the winner."
            );
            HH.collectFromGateway((10001), msg.sender);
            biddersRedeemed[msg.sender] = true;
        } else {
            bool eligible;
            for (uint i = 0; i < bidHeader + 1; i++) {
                if (msg.sender == biddersHistory[i]) {
                    eligible = true;
                    break;
                }
            }
            require(eligible, "You are not a bidder.");
            HH.collectFromGateway(mintCounter, msg.sender);
            mintCounter++;
            biddersRedeemed[msg.sender] = true;
        }
    }

    function getMinBid() public view returns (uint256) {
        if (bidHistory[bidHeader] < reservePrice) return reservePrice;
        return
            bidHistory[bidHeader] +
            bidHistory[bidHeader].mul(percBidIncrement).div(100);
    }

    function getBidHistory()
        public
        view
        returns (uint256[] memory _bids, address[] memory _bidders)
    {
        uint256[] memory bids = new uint256[](bidHeader + 1);
        address[] memory bidders = new address[](bidHeader + 1);
        for (uint i = 0; i <= bidHeader; i++) {
            bids[i] = bidHistory[i];
            bidders[i] = biddersHistory[i];
        }
        return (bids, bidders);
    }

    function canMint(address _toCheck) external view returns (uint256) {
        if (block.timestamp > auctionEndTime && !biddersRedeemed[_toCheck]) {
            if (_toCheck == biddersHistory[bidHeader]) {
                if (_toCheck == biddersHistory[bidHeader]) {
                    return 1;
                }
            } else {
                bool eligible;
                for (uint i = 0; i < bidHeader + 1; i++) {
                    if (_toCheck == biddersHistory[i]) {
                        eligible = true;
                        break;
                    }
                }
                if (eligible) {
                    return 2;
                }
            }
        }

        return 0;
    }

    function startAuction(
        address _hhGallery,
        address _deathrow,
        uint256 _timeLength,
        uint256 _reservePrice,
        uint256 _percIncrement
    ) external onlyOwner {
        HH = IHH(_hhGallery);
        DR = IDR(_deathrow);
        auctionEndTime = block.timestamp.add(_timeLength);
        reservePrice = _reservePrice;
        percBidIncrement = _percIncrement;
    }

    function setOpened(bool _flag) external onlyOwner {
        opened = _flag;
    }

    function withdraw() external onlyOwner {
        require(payable(owner()).send(address(this).balance));
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * 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 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 {
        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: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// 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;
    }
}