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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// adjusted, original copied from https://solidity-by-example.org/app/english-auction/

interface IERC721 {
    function safeTransferFrom(address from, address to, uint tokenId) external;

    function transferFrom(address, address, uint) external;
}

interface IERC20 {
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);
}

contract EnglishAuction {
    event Start();
    event Bid(address indexed sender, uint amount);
    event Withdraw(address indexed bidder, uint amount);
    event WithdrawFailed(address indexed bidder, uint amount);
    event End(address winner, uint amount);

    IERC721 public nft;
    uint public nftId;

    IERC20 public biddingToken;

    address public seller;
    address public beneficiary10Percent;
    address public beneficiary90Percent;
    uint public endAt;
    bool public started;
    bool public ended;

    address public highestBidder;
    uint public highestBid;
    mapping(address => uint) public failedWithdraws;

    constructor(address _nft, uint _nftId, uint _startingBid, address _biddingToken, address _beneficiary90Percent, address _beneficiary10Percent) {
        nft = IERC721(_nft);
        nftId = _nftId;

        biddingToken = IERC20(_biddingToken);

        seller = msg.sender;
        beneficiary90Percent = _beneficiary90Percent;
        beneficiary10Percent = _beneficiary10Percent;
        highestBid = _startingBid;
    }

    function start() external {
        require(!started, "started");
        require(msg.sender == seller, "not seller");

        nft.transferFrom(msg.sender, address(this), nftId);
        started = true;
        endAt = block.timestamp + 4 days + 11 hours;

        emit Start();
    }

    function bid(uint bidAmount) external {
        require(started, "not started");
        require(block.timestamp < endAt, "ended");
        require(bidAmount > highestBid, "bidAmount < highest");

        require(biddingToken.transferFrom(msg.sender, address(this), bidAmount), "transfer failed");

        // adjusted with logic that was previously in withdraw to automatically payout overbid accounts
        if (highestBidder != address(0)) {
            bool sent = biddingToken.transfer(highestBidder, highestBid); // we want to handle failures manually, failing payout shouldn't prevent bidding

            if (sent) {
                emit Withdraw(highestBidder, highestBid);
            } else {
                failedWithdraws[highestBidder] += highestBid;
                emit WithdrawFailed(highestBidder, highestBid);
            }
        }

        highestBidder = msg.sender;
        highestBid = bidAmount;

        emit Bid(msg.sender, bidAmount);
    }

    function withdrawFailed() external {
        uint bal = failedWithdraws[msg.sender];
        failedWithdraws[msg.sender] = 0;
        require(biddingToken.transfer(msg.sender, bal), "transfer failed"); // we want to revert on failures

        emit Withdraw(msg.sender, bal);
    }

    function end() external {
        require(started, "not started");
        require(block.timestamp >= endAt, "not ended");
        require(!ended, "ended");

        ended = true;
        if (highestBidder != address(0)) {
            nft.safeTransferFrom(address(this), highestBidder, nftId);

            uint highestBid10Percent = (highestBid * 10) / 100;
            require(biddingToken.transfer(beneficiary10Percent, highestBid10Percent), "transfer failed");
            require(biddingToken.transfer(beneficiary90Percent, highestBid - highestBid10Percent), "transfer failed");
        } else {
            nft.safeTransferFrom(address(this), seller, nftId);
        }

        emit End(highestBidder, highestBid);
    }

    function setEndAt(uint newEndAtTimestamp) external {
        require(msg.sender == seller, "not seller");
        require(started, "not started");
        require(!ended, "ended");
        require(newEndAtTimestamp > block.timestamp, "end at has to be in the future");
        endAt = newEndAtTimestamp;
    }
}

{
  "optimizer": {
    "enabled": false,
    "runs": 1000
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_nft","type":"address"},{"internalType":"uint256","name":"_nftId","type":"uint256"},{"internalType":"uint256","name":"_startingBid","type":"uint256"},{"internalType":"address","name":"_biddingToken","type":"address"},{"internalType":"address","name":"_beneficiary90Percent","type":"address"},{"internalType":"address","name":"_beneficiary10Percent","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Bid","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"winner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"End","type":"event"},{"anonymous":false,"inputs":[],"name":"Start","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"bidder","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"bidder","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"WithdrawFailed","type":"event"},{"inputs":[],"name":"beneficiary10Percent","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"beneficiary90Percent","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"bidAmount","type":"uint256"}],"name":"bid","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"biddingToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"end","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"endAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ended","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"failedWithdraws","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"highestBid","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"highestBidder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nft","outputs":[{"internalType":"contract IERC721","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nftId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"seller","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newEndAtTimestamp","type":"uint256"}],"name":"setEndAt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"start","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"started","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawFailed","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000a71fdf27d5e73fe22028957bb8a0dbbd3409c44f000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000017d78400000000000000000000000000003fab0bbaa03bceaf7c49e2b12877db0142be65fc000000000000000000000000f760d4b7e11b3ef9101c956f381c9a4767552d5d000000000000000000000000b970d19225ec130c747a68f602d83f9820db1bc1

-----Decoded View---------------
Arg [0] : _nft (address): 0xa71Fdf27D5e73fE22028957Bb8a0dBBd3409C44f
Arg [1] : _nftId (uint256): 1
Arg [2] : _startingBid (uint256): 102400000000
Arg [3] : _biddingToken (address): 0x3FAb0bBAa03BCEAF7C49E2b12877dB0142BE65FC
Arg [4] : _beneficiary90Percent (address): 0xF760D4b7E11b3ef9101c956f381c9a4767552D5d
Arg [5] : _beneficiary10Percent (address): 0xB970D19225ec130C747a68F602D83f9820DB1bc1

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000a71fdf27d5e73fe22028957bb8a0dbbd3409c44f
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [2] : 00000000000000000000000000000000000000000000000000000017d7840000
Arg [3] : 0000000000000000000000003fab0bbaa03bceaf7c49e2b12877db0142be65fc
Arg [4] : 000000000000000000000000f760d4b7e11b3ef9101c956f381c9a4767552d5d
Arg [5] : 000000000000000000000000b970d19225ec130c747a68f602d83f9820db1bc1