Contract Source Code:

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

/**
 * @dev Provides information about the current execution context.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "./Context.sol";
import "./IERC20Metadata.sol";

/**
 * @dev Implementation of the ERC20 interface.
 */
contract ERC20 is Context, IERC20Metadata {
    mapping(address => uint256) internal _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 recipient, uint256 amount) public virtual override returns (bool) {
        address sender = _msgSender();
        _transfer(sender, 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) {
        address sender = _msgSender();
        _approve(sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        address caller = _msgSender();
        _spendAllowance(sender, caller, amount);
        _transfer(sender, recipient, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address sender = _msgSender();
        _approve(sender, spender, _allowances[sender][spender] + addedValue);
        return true;
    }

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

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

        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);
    }

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "./IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "./Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.19;

import "./ERC20.sol";
import "./Ownable.sol";

interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
}

/**
 * @dev Ubuntu Token Contract with anti-bot and vesting features
 * - Anti-bot: 99% tax on bot sells, sent to liquidity pool
 * - Vesting: Gradual token release over 18 months starting June 1, 2026
 * - Tax applies only on DEX trades (Uniswap)
 * - Regular wallet-to-wallet transfers have 0% tax
 */
contract UbuntuToken is ERC20, Ownable {
    address public liquidityWallet = address(0xa591f5Fcd9756008918259a60701b4040ff5A676);
    uint256 public buyTax = 300; // 3% (300/10000)
    uint256 public sellTax = 300; // 3% (300/10000)
    uint256 public buyBurn = 2; // 0.02% (2/10000)
    uint256 public sellBurn = 2; // 0.02% (2/10000)
    uint256 public botTax = 9900; // 99% (9900/10000) for bots
    uint256 public constant TAX_DENOMINATOR = 10000;
    
    IUniswapV2Router02 public uniswapV2Router;
    address public uniswapV2Pair;
    
    // Addresses exempt from tax
    mapping(address => bool) public isExcludedFromFees;
    
    // Anti-bot tracking
    mapping(address => bool) public isBot;
    bool public antiBotEnabled = true;
    uint256 public tradingEnabledTime;
    uint256 public botProtectionDuration = 300; // 5 minutes in seconds
    
    // Vesting structure
    struct VestingSchedule {
        uint256 totalAmount;
        uint256 released;
        uint256 startTime;
        uint256 duration;
    }
    
    mapping(address => VestingSchedule) public vestingSchedules;
    uint256 public vestingStartTime = 1748736000; // June 1, 2026 00:00:00 UTC
    uint256 public vestingDuration = 18 * 30 days; // 18 months (approximately)
    
    event BotDetected(address indexed bot);
    event BotStatusUpdated(address indexed account, bool isBot);
    event VestingScheduleCreated(address indexed beneficiary, uint256 amount);
    event TokensReleased(address indexed beneficiary, uint256 amount);
    event TaxUpdated(uint256 buyTax, uint256 sellTax, uint256 botTax);
    event BurnUpdated(uint256 buyBurn, uint256 sellBurn);
    event LiquidityWalletUpdated(address indexed newWallet);
    event VestingConfigUpdated(uint256 startTime, uint256 duration);
    event TradingEnabled(uint256 timestamp);
    
    constructor() ERC20("UbuntuCoin", "UBU") Ownable() {
        // Set up Uniswap router based on chain
        if (block.chainid == 1) {
            // Ethereum Mainnet
            uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        } else if (block.chainid == 11155111) {
            // Sepolia
            uniswapV2Router = IUniswapV2Router02(0xeE567Fe1712Faf6149d80dA1E6934E354124CfE3);
        }
        
        // Create Uniswap pair
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory())
            .createPair(address(this), uniswapV2Router.WETH());
        
        // Mint total supply
        _mint(msg.sender, 10_000_000_000 * 10 ** decimals());
        
        // Exempt owner, contract, and dead address from tax
        isExcludedFromFees[msg.sender] = true;
        isExcludedFromFees[address(this)] = true;
        isExcludedFromFees[address(0xdead)] = true;
        isExcludedFromFees[liquidityWallet] = true;
        
        // Trading will be enabled by owner
        tradingEnabledTime = 0;
    }

    function decimals() public view virtual override returns (uint8) {
        return 6;
    }
    
    /**
     * @dev Override transfer to apply tax ONLY on DEX trades with anti-bot logic
     * Regular wallet-to-wallet transfers have NO tax
     */
    function _transfer(address from, address to, uint256 amount) internal virtual override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        
        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        // Check if trading is enabled (allow owner and excluded addresses to trade before launch)
        if (tradingEnabledTime == 0 && !isExcludedFromFees[from] && !isExcludedFromFees[to]) {
            require(from != uniswapV2Pair && to != uniswapV2Pair, "Trading not enabled yet");
        }
        
        // Anti-bot detection: Mark as bot if buying in first blocks after launch
        if (antiBotEnabled && tradingEnabledTime > 0 && 
            block.timestamp <= tradingEnabledTime + botProtectionDuration &&
            from == uniswapV2Pair && !isExcludedFromFees[to] && to != address(uniswapV2Router)) {
            isBot[to] = true;
            emit BotDetected(to);
        }

        uint256 senderBalance = _balances[from];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");

        // Calculate fees (only on buys/sells, NOT on wallet transfers)
        uint256 fees = 0;
        uint256 burnAmount = 0;
        
        if (!isExcludedFromFees[from] && !isExcludedFromFees[to]) {
            // Apply 99% tax to bots selling
            if (isBot[from] && to == uniswapV2Pair) {
                fees = (amount * botTax) / TAX_DENOMINATOR;
            }
            // On sell (transfer to Uniswap pair)
            else if (to == uniswapV2Pair && sellTax > 0) {
                fees = (amount * sellTax) / TAX_DENOMINATOR;
                burnAmount = (amount * sellBurn) / TAX_DENOMINATOR;
            }
            // On buy (transfer from Uniswap pair)
            else if (from == uniswapV2Pair && buyTax > 0) {
                fees = (amount * buyTax) / TAX_DENOMINATOR;
                burnAmount = (amount * buyBurn) / TAX_DENOMINATOR;
            }
        }

        // Execute transfer
        unchecked {
            _balances[from] = senderBalance - amount;
        }
        
        if (fees > 0) {
            // Transfer fees to liquidity wallet
            _balances[liquidityWallet] += fees;
            emit Transfer(from, liquidityWallet, fees);
        }
        
        if (burnAmount > 0) {
            // Burn tokens (send to dead address)
            _balances[address(0xdead)] += burnAmount;
            emit Transfer(from, address(0xdead), burnAmount);
        }

        amount -= (fees + burnAmount);
        _balances[to] += amount;
        emit Transfer(from, to, amount);
    }
    
    // ============================================
    // VESTING FUNCTIONS
    // ============================================
    
    /**
     * @dev Create a vesting schedule for a beneficiary (only owner)
     * @param beneficiary Address to receive vested tokens
     * @param amount Total amount of tokens to vest
     */
    function createVestingSchedule(address beneficiary, uint256 amount) external onlyOwner {
        require(beneficiary != address(0), "Beneficiary is zero address");
        require(amount > 0, "Amount must be greater than 0");
        require(vestingSchedules[beneficiary].totalAmount == 0, "Vesting schedule already exists");
        
        vestingSchedules[beneficiary] = VestingSchedule({
            totalAmount: amount,
            released: 0,
            startTime: vestingStartTime,
            duration: vestingDuration
        });
        
        // Transfer tokens to contract for vesting
        _transfer(msg.sender, address(this), amount);
        
        emit VestingScheduleCreated(beneficiary, amount);
    }
    
    /**
     * @dev Calculate releasable tokens for a beneficiary
     * @param beneficiary Address to check
     */
    function releasableAmount(address beneficiary) public view returns (uint256) {
        VestingSchedule memory schedule = vestingSchedules[beneficiary];
        
        if (schedule.totalAmount == 0) {
            return 0;
        }
        
        if (block.timestamp < schedule.startTime) {
            return 0;
        }
        
        if (block.timestamp >= schedule.startTime + schedule.duration) {
            return schedule.totalAmount - schedule.released;
        }
        
        uint256 timeFromStart = block.timestamp - schedule.startTime;
        uint256 vestedAmount = (schedule.totalAmount * timeFromStart) / schedule.duration;
        
        return vestedAmount - schedule.released;
    }
    
    /**
     * @dev Release vested tokens to beneficiary
     */
    function releaseVestedTokens() external {
        uint256 unreleased = releasableAmount(msg.sender);
        require(unreleased > 0, "No tokens to release");
        
        vestingSchedules[msg.sender].released += unreleased;
        
        _balances[address(this)] -= unreleased;
        _balances[msg.sender] += unreleased;
        
        emit TokensReleased(msg.sender, unreleased);
        emit Transfer(address(this), msg.sender, unreleased);
    }
    
    /**
     * @dev Get vesting schedule information
     */
    function getVestingSchedule(address beneficiary) external view returns (
        uint256 totalAmount,
        uint256 released,
        uint256 releasable,
        uint256 startTime,
        uint256 duration
    ) {
        VestingSchedule memory schedule = vestingSchedules[beneficiary];
        return (
            schedule.totalAmount,
            schedule.released,
            releasableAmount(beneficiary),
            schedule.startTime,
            schedule.duration
        );
    }
    
    // ============================================
    // ANTI-BOT FUNCTIONS
    // ============================================
    
    /**
     * @dev Enable trading (can only be called once by owner)
     */
    function enableTrading() external onlyOwner {
        require(tradingEnabledTime == 0, "Trading already enabled");
        tradingEnabledTime = block.timestamp;
        emit TradingEnabled(block.timestamp);
    }
    
    /**
     * @dev Manually mark addresses as bots
     */
    function setBotStatus(address[] calldata accounts, bool status) external onlyOwner {
        for (uint256 i = 0; i < accounts.length; i++) {
            isBot[accounts[i]] = status;
            emit BotStatusUpdated(accounts[i], status);
        }
    }
    
    /**
     * @dev Toggle anti-bot mechanism
     */
    function setAntiBotEnabled(bool enabled) external onlyOwner {
        antiBotEnabled = enabled;
    }
    
    /**
     * @dev Update bot protection duration
     */
    function setBotProtectionDuration(uint256 duration) external onlyOwner {
        botProtectionDuration = duration;
    }
    
    // ============================================
    // ADMIN FUNCTIONS
    // ============================================
    
    /**
     * @dev Update tax rates
     */
    function updateTax(uint256 _buyTax, uint256 _sellTax, uint256 _botTax) external onlyOwner {
        require(_buyTax <= 10000, "Buy tax too high"); // Max 10%
        require(_sellTax <= 10000, "Sell tax too high"); // Max 10%
        require(_botTax <= 10000, "Bot tax too high"); // Max 10%
        
        buyTax = _buyTax;
        sellTax = _sellTax;
        botTax = _botTax;
        
        emit TaxUpdated(_buyTax, _sellTax, _botTax);
    }
    
    /**
     * @dev Update burn rates
     */
    function updateBurn(uint256 _buyBurn, uint256 _sellBurn) external onlyOwner {
        require(_buyBurn <= 10000, "Buy burn too high"); // Max 1%
        require(_sellBurn <= 10000, "Sell burn too high"); // Max 1%
        
        buyBurn = _buyBurn;
        sellBurn = _sellBurn;
        
        emit BurnUpdated(_buyBurn, _sellBurn);
    }
    
    /**
     * @dev Update liquidity wallet address
     */
    function updateLiquidityWallet(address newWallet) external onlyOwner {
        require(newWallet != address(0), "Invalid wallet address");
        liquidityWallet = newWallet;
        isExcludedFromFees[newWallet] = true;
        
        emit LiquidityWalletUpdated(newWallet);
    }
    
    /**
     * @dev Update vesting configuration
     */
    function updateVestingConfig(uint256 _startTime, uint256 _duration) external onlyOwner {
        require(_startTime > block.timestamp, "Start time must be in future");
        require(_duration > 0, "Duration must be greater than 0");
        
        vestingStartTime = _startTime;
        vestingDuration = _duration;
        
        emit VestingConfigUpdated(_startTime, _duration);
    }
    
    /**
     * @dev Set fee exclusion status
     */
    function setExcludedFromFees(address account, bool excluded) external onlyOwner {
        isExcludedFromFees[account] = excluded;
    }
}