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/**
 *Submitted for verification at Etherscan.io on 2021-04-20
*/

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.6.7;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // 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 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return c;
    }
    
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface IERC1155 {
    function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external;
}

contract EnglishAuction {
    using SafeMath for uint256;
    // System settings
    uint256 public id;
    address public token;
    bool public ended = false;
    
    // Current winning bid
    uint256 public lastBid;
    address payable public winning;
    
    uint256 public length;
    uint256 public startTime;
    uint256 public endTime;
    
    address payable public haus;
    address payable public seller;
    
    event Bid(address who, uint256 amount);
    event Won(address who, uint256 amount);
    
    constructor() public {
        token = address(0x13bAb10a88fc5F6c77b87878d71c9F1707D2688A);
        id = 60;
        startTime = 1618945200;
        length = 24 hours;
        endTime = startTime + length;
        lastBid = 1.5 ether;
        seller = payable(address(0x15884D7a5567725E0306A90262ee120aD8452d58));
        haus = payable(address(0x15884D7a5567725E0306A90262ee120aD8452d58));
    }
    
    function bid() public payable {
        require(msg.sender == tx.origin, "no contracts");
        require(block.timestamp >= startTime, "Auction not started");
        require(block.timestamp < endTime, "Auction ended");
        require(msg.value >= lastBid.mul(105).div(100), "Bid too small");
        
        // Give back the last bidders money
        if (winning != address(0)) {
            winning.transfer(lastBid);
        }
        
        if (endTime - block.timestamp < 15 minutes) {
            endTime += 15 minutes;
        }
        
        lastBid = msg.value;
        winning = msg.sender;
        emit Bid(msg.sender, msg.value);
    }
    
    function end() public {
        require(!ended, "end already called");
        require(winning != address(0), "no bids");
        require(!live(), "Auction live");
        // transfer erc1155 to winner
        IERC1155(token).safeTransferFrom(address(this), winning, id, 1, new bytes(0x0));
        uint256 balance = address(this).balance;
        uint256 hausFee = balance.div(20).mul(3);
        haus.transfer(hausFee);
        seller.transfer(address(this).balance);
        ended = true;
        emit Won(winning, lastBid);
    }
    
    function pull() public {
        require(!ended, "end already called");
        require(winning == address(0), "There were bids");
        require(!live(), "Auction live");
        // transfer erc1155 to seller
        IERC1155(token).safeTransferFrom(address(this), seller, id, 1, new bytes(0x0));
        ended = true;
    }
    
    function live() public view returns(bool) {
        return block.timestamp < endTime;
    }
    
    function onERC1155Received(address, address, uint256, uint256, bytes calldata) external pure returns(bytes4) {
        return bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"));
    }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"who","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Bid","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"who","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Won","type":"event"},{"inputs":[],"name":"bid","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"end","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"endTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ended","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"haus","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"id","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastBid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"length","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"live","outputs":[{"internalType":"bool","name":"","type":"bool"}],"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":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"pull","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"seller","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"winning","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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