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

contract AURAToken {
    string public name = "AURA";
    string public symbol = "AURA";
    uint8 public decimals = 18;
    uint256 public totalSupply;
    uint256 public sellTaxPercentage = 20; // 20% sell tax
    address public taxWallet; // Wallet to receive tax
    address public contractOwner;

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

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

    modifier onlyOwner() {
        require(msg.sender == contractOwner, "Caller is not the owner");
        _;
    }

    constructor() {
        totalSupply = 100_000_000 * 10**uint256(decimals); // 100 million tokens with 18 decimals
        contractOwner = msg.sender;
        taxWallet = 0xf7380c028b419525eb57C1B2A38B4Eb998C5Ef82;
        _balances[msg.sender] = totalSupply;
        _isExcludedFromTax[msg.sender] = true;
        _isExcludedFromTax[taxWallet] = true;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

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

    function allowance(address ownerAddress, address spender) public view returns (uint256) {
        return _allowances[ownerAddress][spender];
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
        return true;
    }

    function multiTransfer(address[] calldata recipients, uint256[] calldata amounts) external returns (bool) {
        require(recipients.length == amounts.length, "Recipients and amounts length mismatch");
        uint256 totalAmount = 0;

        for (uint256 i = 0; i < recipients.length; i++) {
            require(recipients[i] != address(0), "Cannot transfer to the zero address");
            require(_balances[msg.sender] >= amounts[i], "Insufficient balance for transfer");

            uint256 taxAmount = 0;

            if (!_isExcludedFromTax[msg.sender] && !_isExcludedFromTax[recipients[i]]) {
                taxAmount = (amounts[i] * sellTaxPercentage) / 100;
                require(amounts[i] > taxAmount, "Tax exceeds transfer amount");

                _balances[taxWallet] += taxAmount;
                emit Transfer(msg.sender, taxWallet, taxAmount);
            }

            uint256 transferAmount = amounts[i] - taxAmount;
            _balances[msg.sender] -= amounts[i];
            _balances[recipients[i]] += transferAmount;

            emit Transfer(msg.sender, recipients[i], transferAmount);

            totalAmount += amounts[i];
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        require(sender != address(0), "Transfer from the zero address");
        require(recipient != address(0), "Transfer to the zero address");
        require(_balances[sender] >= amount, "Transfer amount exceeds balance");

        uint256 taxAmount = 0;

        if (!_isExcludedFromTax[sender] && !_isExcludedFromTax[recipient]) {
            taxAmount = (amount * sellTaxPercentage) / 100;
            require(amount > taxAmount, "Tax exceeds transfer amount");

            _balances[taxWallet] += taxAmount;
            emit Transfer(sender, taxWallet, taxAmount);
        }

        _balances[sender] -= amount;
        _balances[recipient] += (amount - taxAmount);
        emit Transfer(sender, recipient, amount - taxAmount);
    }

    function _approve(
        address ownerAddress,
        address spender,
        uint256 amount
    ) internal {
        require(ownerAddress != address(0), "Approve from the zero address");
        require(spender != address(0), "Approve to the zero address");

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

    function setTaxWallet(address _taxWallet) external onlyOwner {
        require(_taxWallet != address(0), "Tax wallet cannot be the zero address");
        taxWallet = _taxWallet;
    }

    function setSellTaxPercentage(uint256 _sellTaxPercentage) external onlyOwner {
        require(_sellTaxPercentage <= 100, "Tax cannot exceed 100%"); // Safety check
        sellTaxPercentage = _sellTaxPercentage;
    }

    function setExcludedFromTax(address account, bool excluded) external onlyOwner {
        _isExcludedFromTax[account] = excluded;
    }

    function isExcludedFromTax(address account) external view returns (bool) {
        return _isExcludedFromTax[account];
    }
}

{
  "compilationTarget": {
    "AURAToken.sol": "AURAToken"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}