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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

/**
 * @title Wrapped Unicorns w🦄
 * @notice A 1:1 ERC-20 wrapper for the historic 2016 Unicorns 🦄 token, 
 *         created by Alex Van de Sande for 2.014+ ETH donors of the FoudationTipJar.
 * @dev The original token remains at 0x89205A3A3b2A69De6Dbf7f01ED13B2108B2c43e7 and must be wrapped via `approve` and then `wrap`.
*/

// Interface to the original 2016 Unicorn token 🦄
interface IUnicorns {
    function transferFrom(address from, address to, uint256 value) external;
    function transfer(address to, uint256 value) external;
    function balanceOf(address owner) external view returns (uint256);
}

contract WrappedUnicorns {
    // --- Metadata ---
    string public constant name = "Unicorns";
    string public constant symbol = unicode"w🦄";
    uint8  public constant decimals = 0;

    /// @notice Immutable reference to the original Unicorns token 🦄
    IUnicorns public immutable unicorns;

    // --- ERC-20 storage ---
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    uint256 public totalSupply;

    // --- Events ---
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Wrapped(address indexed from, uint256 amount);
    event Unwrapped(address indexed to, uint256 amount);

    constructor() {
        unicorns = IUnicorns(0x89205A3A3b2A69De6Dbf7f01ED13B2108B2c43e7);
    }

    // ----------------------------
    // Wrap / Unwrap (core logic)
    // ----------------------------

    /// @notice Lock Unicorns and mint equivalent wrapped Unicorn tokens.
    /// @dev User must first call `approve(wrapper, amount)` on the Unicorn token.
    function wrap(uint256 amount) external {
        require(amount > 0, "zero amount");
        unicorns.transferFrom(msg.sender, address(this), amount);

        balanceOf[msg.sender] += amount;
        totalSupply += amount;

        emit Transfer(address(0), msg.sender, amount);
        emit Wrapped(msg.sender, amount);
    }

    /// @notice Burn wrapped Unicorn tokens to redeem the same number of Unicorns.
    function unwrap(uint256 amount) external {
        require(amount > 0, "zero amount");
        uint256 bal = balanceOf[msg.sender];
        require(bal >= amount, "insufficient balance");

        balanceOf[msg.sender] = bal - amount;
        totalSupply -= amount;

        unicorns.transfer(msg.sender, amount);

        emit Transfer(msg.sender, address(0), amount);
        emit Unwrapped(msg.sender, amount);
    }

    // ----------------------------
    // ERC-20 functions
    // ----------------------------

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

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

    function transferFrom(address from, address to, uint256 amount) external returns (bool) {
        uint256 allowed = allowance[from][msg.sender];
        require(allowed >= amount, "allowance exceeded");
        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
        _transfer(from, to, amount);
        return true;
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(to != address(0), "transfer to zero");
        uint256 bal = balanceOf[from];
        require(bal >= amount, "insufficient balance");

        balanceOf[from] = bal - amount;
        balanceOf[to] += amount;
        emit Transfer(from, to, amount);
    }

    // ----------------------------
    // Block accidental ETH sends
    // ----------------------------
    receive() external payable { revert(); }
    fallback() external payable { revert(); }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"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"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Unwrapped","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Wrapped","type":"event"},{"stateMutability":"payable","type":"fallback"},{"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":"amount","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":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","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":"amount","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":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unicorns","outputs":[{"internalType":"contract IUnicorns","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"unwrap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"wrap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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