LaunchToken

[
  {
    "inputs": [
      {
        "internalType": "string",
        "name": "name_",
        "type": "string"
      },
      {
        "internalType": "string",
        "name": "symbol_",
        "type": "string"
      },
      {
        "internalType": "string",
        "name": "tokenURI_",
        "type": "string"
      },
      {
        "internalType": "uint256",
        "name": "supply_",
        "type": "uint256"
      },
      {
        "internalType": "address",
        "name": "pairToken_",
        "type": "address"
      },
      {
        "internalType": "uint24",
        "name": "poolFee_",
        "type": "uint24"
      },
      {
        "internalType": "uint256",
        "name": "restrictionBlocks_",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "maxTxLimit_",
        "type": "uint256"
      },
      {
        "internalType": "address",
        "name": "receiver_",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "launchOrigin_",
        "type": "address"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "inputs": [],
    "name": "InsufficientAllowance",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "InsufficientBalance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "recipient",
        "type": "address"
      }
    ],
    "name": "LaunchBlockBuyBlocked",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "originator",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "attempted",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "limit",
        "type": "uint256"
      }
    ],
    "name": "MaxTxExceeded",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "account",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "balance",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "limit",
        "type": "uint256"
      }
    ],
    "name": "MaxWalletExceeded",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "Unauthorized",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "ZeroAddress",
    "type": "error"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "owner",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "Approval",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "from",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "Transfer",
    "type": "event"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "allowance",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "approve",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "balanceOf",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "boughtInBlock",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "buyBlock",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "decimals",
    "outputs": [
      {
        "internalType": "uint8",
        "name": "",
        "type": "uint8"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "launchBlock",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "launchFactory",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "launchOrigin",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "liquidityPool",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "maxTxLimit",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "maxWalletLimit",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "name",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "pairToken",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "poolFee",
    "outputs": [
      {
        "internalType": "uint24",
        "name": "",
        "type": "uint24"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "restrictionEndBlock",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "restrictionExempt",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "account",
        "type": "address"
      },
      {
        "internalType": "bool",
        "name": "enabled",
        "type": "bool"
      }
    ],
    "name": "setInitialBuyExemption",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "pool",
        "type": "address"
      }
    ],
    "name": "setPool",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "symbol",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "tokenURI",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "totalSupply",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transfer",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "from",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transferFrom",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  }
]

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

/// @notice Ordinary, non-upgradeable ERC-20 deployed for one Hooday launch.
/// @dev The complete supply is minted once to the Factory for single-sided LP.
contract LaunchToken {
    uint8 public constant decimals = 18;

    string public name;
    string public symbol;
    string public tokenURI;
    uint256 public totalSupply;
    address public immutable launchFactory;
    address public immutable launchOrigin;
    address public liquidityPool;
    address public immutable pairToken;
    uint24 public immutable poolFee;
    uint256 public immutable launchBlock;
    uint256 public immutable restrictionEndBlock;
    uint256 public immutable maxWalletLimit;
    uint256 public immutable maxTxLimit;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => bool) public restrictionExempt;
    mapping(address => uint256) public buyBlock;
    mapping(address => uint256) public boughtInBlock;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    error Unauthorized();
    error ZeroAddress();
    error InsufficientBalance();
    error InsufficientAllowance();
    error LaunchBlockBuyBlocked(address recipient);
    error MaxWalletExceeded(address account, uint256 balance, uint256 limit);
    error MaxTxExceeded(address originator, uint256 attempted, uint256 limit);

    constructor(
        string memory name_,
        string memory symbol_,
        string memory tokenURI_,
        uint256 supply_,
        address pairToken_,
        uint24 poolFee_,
        uint256 restrictionBlocks_,
        uint256 maxTxLimit_,
        address receiver_,
        address launchOrigin_
    ) {
        if (
            bytes(name_).length == 0 ||
            bytes(symbol_).length == 0 ||
            pairToken_ == address(0) ||
            receiver_ == address(0) ||
            launchOrigin_ == address(0)
        ) revert ZeroAddress();

        name = name_;
        symbol = symbol_;
        tokenURI = tokenURI_;
        totalSupply = supply_;
        launchFactory = msg.sender;
        launchOrigin = launchOrigin_;
        pairToken = pairToken_;
        poolFee = poolFee_;
        launchBlock = block.number;
        restrictionEndBlock = block.number + restrictionBlocks_;
        maxWalletLimit = supply_ * 2 / 100;
        maxTxLimit = maxTxLimit_;
        restrictionExempt[msg.sender] = true;
        restrictionExempt[receiver_] = true;
        balanceOf[receiver_] = supply_;
        emit Transfer(address(0), receiver_, supply_);
    }

    function setPool(address pool) external {
        if (msg.sender != launchFactory || liquidityPool != address(0) || pool == address(0)) {
            revert Unauthorized();
        }
        liquidityPool = pool;
    }

    /// @notice Temporarily exempts only the Factory-executed initial-buy recipient.
    function setInitialBuyExemption(address account, bool enabled) external {
        if (msg.sender != launchFactory || block.number != launchBlock) revert Unauthorized();
        restrictionExempt[account] = enabled;
    }

    function approve(address spender, uint256 value) external returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) external returns (bool) {
        uint256 approved = allowance[from][msg.sender];
        if (approved != type(uint256).max) {
            if (approved < value) revert InsufficientAllowance();
            allowance[from][msg.sender] = approved - value;
        }
        _transfer(from, to, value);
        return true;
    }

    function _transfer(address from, address to, uint256 value) private {
        if (to == address(0)) revert ZeroAddress();
        uint256 fromBalance = balanceOf[from];
        if (fromBalance < value) revert InsufficientBalance();

        if (
            from == liquidityPool &&
            block.number < restrictionEndBlock &&
            !restrictionExempt[to]
        ) {
            if (block.number == launchBlock && tx.origin != launchOrigin) {
                revert LaunchBlockBuyBlocked(to);
            }
            uint256 afterBalance = balanceOf[to] + value;
            if (afterBalance > maxWalletLimit) {
                revert MaxWalletExceeded(to, afterBalance, maxWalletLimit);
            }
            if (buyBlock[tx.origin] != block.number) {
                buyBlock[tx.origin] = block.number;
                boughtInBlock[tx.origin] = 0;
            }
            uint256 attempted = boughtInBlock[tx.origin] + value;
            if (attempted > maxTxLimit * 110 / 100) {
                revert MaxTxExceeded(tx.origin, attempted, maxTxLimit);
            }
            boughtInBlock[tx.origin] = attempted;
        }

        unchecked {
            balanceOf[from] = fromBalance - value;
            balanceOf[to] += value;
        }
        emit Transfer(from, to, value);
    }
}