// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;


/// @notice Interface for contracts that can receive token approvals and execute logic
/// @dev This abstract contract defines the callback function that spender contracts must implement
/// @dev Used in conjunction with approveAndCall to enable atomic approve + call transactions
abstract contract ApproveAndCallFallBack {
    /// @notice Callback function called when tokens are approved via approveAndCall
    /// @dev This function should contain the logic to execute after receiving token approval
    /// @param from The address that approved the tokens
    /// @param tokens The amount of tokens approved
    /// @param token The address of the token contract that called this function
    /// @param data Additional data passed from the approveAndCall function    
    function receiveApproval(address from, uint256 tokens, address token, bytes calldata data) public virtual;
}
/// @notice Main contract for Test0xBitcoin token
contract Test0xBTC {
    /// @notice Token name identifier
    string public name = "Test0xBitcoin";
    /// @notice Token symbol for trading/display purposes  
    string public symbol = "T0XBTC";
    /// @notice Number of decimal places for token precision
    uint8 public decimals = 8;
   // uint256 public totalSupply;
    /// @notice Mapping to track balance of each address
    mapping(address => uint256) public balanceOf;
    /// @notice Nested mapping for allowances (owner -> spender -> amount)
    mapping(address => mapping(address => uint256)) public allowance;
    /// @notice Event emitted when tokens are transferred
    event Transfer(address indexed from, address indexed to, uint256 value);
    /// @notice Event emitted when allowance is set/approved
    event Approval(address indexed owner, address indexed spender, uint256 value);
    
    /// @notice Constructor to initialize the contract with initial token supply
    constructor() {
        /// @notice Initial token supply calculation variable
        uint256 initialSupply = 11000000 * 10 ** uint256(decimals); // 21 million tokens
        balanceOf[msg.sender] = initialSupply;
      //  totalSupply = initialSupply;
        emit Transfer(address(0), msg.sender, initialSupply);
    }
    
    /// @notice Faucet function to distribute test tokens
    function getFaucetTokens_Testnet_0xBTC() public {
        /// @notice Amount of tokens to distribute from faucet
        uint sendz = 10* 10 ** decimals; //10 tokens
        balanceOf[msg.sender] += sendz;
      //  totalSupply += sendz;
        emit Transfer(address(0), msg.sender, sendz);
    }
    
    /// @notice Standard ERC20 transfer function for sending tokens
    /// @param to recipient address for the token transfer
    /// @param value amount of tokens to transfer
    /// @return bool returns true if transfer is successful
    function transfer(address to, uint256 value) public returns (bool) {
        require(balanceOf[msg.sender] >= value, "Insufficient balance");
        _transfer(msg.sender, to, value);
        return true;
    }
    
    /// @notice Standard ERC20 approve function for setting allowances
    /// @param spender address that will be allowed to spend tokens
    /// @param value amount of tokens that can be spent
    /// @return bool returns true if approval is successful
    function approve(address spender, uint256 value) public returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }
    
    /// @notice Standard ERC20 transferFrom function for spending approved tokens
    /// @param from address to transfer tokens from
    /// @param to address to transfer tokens to
    /// @param value amount of tokens to transfer
    /// @return bool returns true if transfer is successful
    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        require(balanceOf[from] >= value, "Insufficient balance");
        require(allowance[from][msg.sender] >= value, "Allowance exceeded");
        allowance[from][msg.sender] -= value;
        _transfer(from, to, value);
        return true;
    }
    
    /// @notice Internal helper function to handle token transfers
    /// @param from address to transfer tokens from
    /// @param to address to transfer tokens to
    /// @param value amount of tokens to transfer
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0), "Transfer to zero address");
        balanceOf[from] -= value;
        balanceOf[to] += value;
        emit Transfer(from, to, value);
    }
    
    
    /// @notice Approve tokens for spending and call a contract function in one transaction
    /// @dev This function combines approval and contract call to avoid the need for separate transactions
    /// @dev The spender contract must implement ApproveAndCallFallBack interface with receiveApproval function
    /// @param spender The address authorized to spend the tokens
    /// @param tokens The amount of tokens to approve for spending
    /// @param data Additional data to pass to the spender contract's receiveApproval function
    /// @return success Returns true if the approval and call were successful
    function approveAndCall(address spender, uint tokens, bytes calldata data) public returns (bool success) {
        allowance[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
        return true;
    }



}

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

[{"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"},{"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":"spender","type":"address"},{"internalType":"uint256","name":"tokens","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"approveAndCall","outputs":[{"internalType":"bool","name":"success","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":"getFaucetTokens_Testnet_0xBTC","outputs":[],"stateMutability":"nonpayable","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":[{"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"}]

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