// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

////////////////////////////////////////////////////////////////////////

library SafeMath {
   
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

   
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

  
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

   
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

  
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

   
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

   
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

  
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

  
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

   
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

   
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}


////////////////////////////////////////////////////////////////////////

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    
    constructor() {
        _transferOwnership(_msgSender());
    }

    
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    
    function owner() public view virtual returns (address) {
        return _owner;
    }

    
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


////////////////////////////////////////////////////////////////////////

abstract contract ReentrancyGuard {

    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        _status = _NOT_ENTERED;
    }
}
////////////////////////////////////////////////////////////////////////

interface IERC20 {
   
    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);

    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}

////////////////////////////////////////////////////////////////////////

interface IERC20Metadata is IERC20 {
    
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

////////////////////////////////////////////////////////////////////////


contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    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 to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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;
        unchecked {
            _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 _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}


////////////////////////////////////////////////////////////////////////


contract BOFA is ERC20, Ownable, ReentrancyGuard {
    using SafeMath for uint256;

    mapping(address => uint256) public deposits;
    address[] public depositors;
    address public feeReceiver;
    uint256 public totalDeposits;
    uint256 public constant maxSupply = 1_000_000_000_000 * 10 ** 18; // 1 trillion tokens with 18 decimal places
    bool public maxTransaction;
    bool public taxEnabled;
    bool public initialPoolOpen;
    

    constructor() ERC20("BOFA", "BOFA") {
        _mint(msg.sender, maxSupply);
        taxEnabled = false;
        initialPoolOpen = true;
        feeReceiver = msg.sender;
    }

    function deposit() public payable nonReentrant {
        require(initialPoolOpen, "Initial pool is not open");
        require(deposits[msg.sender] <= 0.5 ether, "You have already contributed the maximum amount");
        require(msg.value >= 0.01 ether, "Minimum deposit is 0.05 ETH");
        require(msg.value <= 0.5 ether, "Maximum deposit is 1 ETH");
        require(totalDeposits.add(msg.value) <= 25 ether, "Deposit pool limit reached");
        if (deposits[msg.sender] == 0) {
            depositors.push(msg.sender);
        }
        deposits[msg.sender] = deposits[msg.sender].add(msg.value);
        totalDeposits = totalDeposits.add(msg.value);
    }
    
    function refund() public nonReentrant {
        require(initialPoolOpen, "Initial pool is still open");
        require(deposits[msg.sender] > 0, "No deposits found");
        uint256 amount = deposits[msg.sender];
        deposits[msg.sender] = 0;
        totalDeposits = totalDeposits.sub(amount);
        (bool success,) = msg.sender.call{value: amount}("");
        require(success, "Withdraw failed");
    }

    function distributeTokens() public onlyOwner nonReentrant {
        require(!initialPoolOpen, "Initial pool is still open");
        require(totalDeposits > 0, "No deposits found");

        uint256 tokenAmount = maxSupply.div(2); // 50% of total supply
        uint256 addressCount = depositors.length;

        for (uint256 i = 0; i < addressCount; i++) {
            address recipient = depositors[i];
            uint256 depositAmount = deposits[recipient];
            uint256 tokensToSend = depositAmount.mul(tokenAmount).div(totalDeposits);
            super._transfer(address(this), recipient, tokensToSend);
            emit Transfer(address(this), recipient, tokensToSend);
        }

        for (uint256 i = 0; i < addressCount; i++) {
            delete deposits[depositors[i]];
        }
        depositors = new address[](0);
        totalDeposits = 0;
    }

    function isMaxTransaction(bool enabled) public onlyOwner {
        maxTransaction = enabled;
    }

    function isPoolOpen(bool enabled) public onlyOwner {
        initialPoolOpen = enabled;
    }

    function isTaxEnabled(bool enabled) public onlyOwner {
        taxEnabled = enabled;
    }

    function setFeeReceiver(address receiver) public onlyOwner {
        feeReceiver = receiver;
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    if (taxEnabled && msg.sender != owner() && recipient != feeReceiver) {
        uint256 taxAmount = amount.div(100);
        uint256 transferAmount = amount.sub(taxAmount);
        if (maxTransaction) {
            require(transferAmount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
        }
        super.transfer(feeReceiver, taxAmount);
        return super.transfer(recipient, transferAmount);
    } else {
        if (maxTransaction) {
            require(amount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
        }
        return super.transfer(recipient, amount);
        }
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        if (taxEnabled && sender != owner() && recipient != feeReceiver) {
            uint256 taxAmount = amount.div(100);
            uint256 transferAmount = amount.sub(taxAmount);
            if (maxTransaction) {
                require(transferAmount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
            }
            super.transferFrom(sender, feeReceiver, taxAmount);
            return super.transferFrom(sender, recipient, transferAmount);
        } else {
            if (maxTransaction) {
                require(amount <= maxSupply.div(100), "Transfer amount exceeds maximum transaction amount");
            }
            return super.transferFrom(sender, recipient, amount);
            }
        }

        function withdraw() public onlyOwner {
            uint256 balance = address(this).balance;
            payable(msg.sender).transfer(balance);
        }
}