// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

interface IUniswapV2ERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
}

interface IUniswapV2Pair is IUniswapV2ERC20 {
    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to);
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint256);
    function price1CumulativeLast() external view returns (uint256);
    function kLast() external view returns (uint256);
    function mint(address to) external returns (uint256 liquidity);
    function burn(address to) external returns (uint256 amount0, uint256 amount1);
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;
    function initialize(address, address) external;
}

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
    external
    payable
    returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
    external
    returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
    external
    returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
    external
    payable
    returns (uint[] memory amounts);
    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    error DecreasedAllowanceBelowZero();
    error ERC20TransferFromZeroAddress();
    error ERC20TransferToZeroAddress();
    error TransferAmountExceedsBalance();
    error MintToZeroAddress();
    error BurnFromZeroAddress();
    error BurnAmountExceedsBalance();
    error ApproveFromZeroAddress();
    error ApproveToZeroAddress();
    error InsufficientAllowance();

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = msg.sender;
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = msg.sender;
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = msg.sender;
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = msg.sender;
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = msg.sender;
        uint256 currentAllowance = allowance(owner, spender);
        if(currentAllowance < subtractedValue) revert DecreasedAllowanceBelowZero();
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        // ERC20: transfer from the zero address
        if(from == address(0)) revert ERC20TransferFromZeroAddress();
        // ERC20: transfer to the zero address
        if(to == address(0)) revert ERC20TransferToZeroAddress();

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        // ERC20: transfer amount exceeds balance
        if(fromBalance < amount) revert TransferAmountExceedsBalance();
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        // ERC20: mint to the zero address
        if(account == address(0)) revert MintToZeroAddress();

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        // ERC20: burn from the zero address
        if(account == address(0)) revert BurnFromZeroAddress();

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        // ERC20: burn amount exceeds balance
        if(accountBalance < amount) revert BurnAmountExceedsBalance();
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        // ERC20: approve from the zero address
        if(owner == address(0)) revert ApproveFromZeroAddress();
        // ERC20: approve to the zero address
        if(spender == address(0)) revert ApproveToZeroAddress();

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            // ERC20: insufficient allowance
            if(currentAllowance < amount) revert InsufficientAllowance();
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

/**
 * @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 {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    error CallerNotOwner();
    error NewOwnerIsZeroAddress();

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(msg.sender);
    }

    /**
     * @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 {
        // Ownable: caller is not the owner
        if(_owner != msg.sender) revert CallerNotOwner();
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 {
        // Ownable: new owner is the zero address
        if(newOwner == address(0)) revert NewOwnerIsZeroAddress();
        _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);
    }
}

contract Evian is ERC20, Ownable {
    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    address public constant DEAD_ADDRESS = address(0xdead);
    address constant ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    // uncomment and replace for mainnet
    address constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    uint256 constant MAX_BUY_FEE_PERCENT = 1100; // 11%
    uint256 constant MAX_SELL_FEE_PERCENT = 1100; // 11%
    address public marketingWallet = 0xBe17D086b8429230De1afFF2aEbeaa5ddb965f3F;
    address public devWallet = 0xd71243fAE774BD0B25b74d0F8BB5bA5a399259ec;
    uint256 public maxTransactionAmount = 20_000_000 * 1e18;
    uint256 public swapTokensAtAmount;
    uint256 public maxWallet = 20_000_000 * 1e18;
    uint256 public percentForLPBurn = 25;
    bool private swapping;
    bool public lpBurnEnabled = true;
    uint256 public lpBurnFrequency = 3600 seconds; // min is 600 seconds
    uint256 public lastLpBurnTime;
    uint256 public manualBurnFrequency = 30 minutes;
    uint256 public lastManualLpBurnTime;
    bool public limitsInEffect = true;
    bool public tradingActive;
    bool public swapEnabled;
    mapping(address => uint256) private _holderLastTransferTimestamp;
    bool public transferDelayEnabled = true;
    uint256 public buyTotalFees = 200; // 2%. must be sum of all buy fee
    uint256 public buyMarketingFee = 150; // 1.5%
    uint256 public buyLiquidityFee;
    uint256 public buyDevFee = 50; // 0.5%
    uint256 public sellTotalFees = 200; // 2%. must be sum of all sell fee
    uint256 public sellMarketingFee = 150; // 1.5%
    uint256 public sellLiquidityFee;
    uint256 public sellDevFee = 50; // 0.5%
    uint256 public tokensForMarketing;
    uint256 public tokensForLiquidity;
    uint256 public tokensForDev;
    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) public _isExcludedMaxTransactionAmount;
    mapping(address => bool) public automatedMarketMakerPairs;
    address public operator;

    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event marketingWalletUpdated(address indexed newWallet, address indexed oldWallet);
    event devWalletUpdated(address indexed newWallet, address indexed oldWallet);
    event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);
    event AutoNukeLP();
    event ManualNukeLP();

    // error codes - 0x+ first 8 characters of keccak256 of function name(). saves gas cost
    error SwapAmountTooLow();           // 0xf570cd77
    error SwapAmountTooHigh();          // 0xbfc71b96
    error MaxTransactionAmountTooLow(); // 0xc7d1448f
    error MaxWalletAmountTooLow();      // 0x24cd9f1a
    error FeeTooHigh();                 // 0xcd4e6167
    error PairNotAllowed();             // 0x6b5dedec
    error TransferFromZeroAddress();    // 0x160fca8a
    error TransferToZeroAddress();      // 0xea553b34
    error TradingNotActive();           // 0xa491421c
    error OneTransferPerBlock();        // 0xf54290c0
    error BuyAmountTooHigh();           // 0x99f6dffb
    error SellAmountTooHigh();          // 0x63d5d62e
    error MaxWalletAmount();            // 0x21ff212c
    error BuyBackTooOften();            // 0xb755e0c0
    error BurnPercentTooHigh();         // 0x2d227832
    error BurnTooSoon();                // 0x0cea97bc
    error NotAuthorized();              // 0xea8e4eb5

    constructor() ERC20("Evian", "EVIAN") {
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(ROUTER);
        excludeFromMaxTransaction(ROUTER, true);
        uniswapV2Router = _uniswapV2Router;
        address _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), WETH);
        uniswapV2Pair = _uniswapV2Pair;
        excludeFromMaxTransaction(_uniswapV2Pair, true);
        _setAutomatedMarketMakerPair(_uniswapV2Pair, true);
        uint256 totalSupply = 1_000_000_000 * 1e18;
        swapTokensAtAmount = (totalSupply * 5) / 10000;
        excludeFromFees(msg.sender, true);
        excludeFromFees(address(this), true);
        excludeFromFees(DEAD_ADDRESS, true);
        excludeFromMaxTransaction(msg.sender, true);
        excludeFromMaxTransaction(address(this), true);
        excludeFromMaxTransaction(DEAD_ADDRESS, true);
        _mint(msg.sender, totalSupply);
        operator = msg.sender;
    }

    receive() external payable {}

    modifier onlyAuthorized() {
        if(owner() != msg.sender && operator != msg.sender) revert NotAuthorized();
        _;
    }

    function setOperator(address operator_) external onlyAuthorized {
        operator = operator_;
    }

    // Disabled to prevent snipers
    function enableTrading() external onlyAuthorized {
        tradingActive = true;
        swapEnabled = true;
        lastLpBurnTime = block.timestamp;
    }

    function removeLimits() external onlyAuthorized {
        limitsInEffect = false;
    }

    // Turns off one transaction per block
    function disableTransferDelay() external onlyAuthorized {
        transferDelayEnabled = false;
    }

    function updateSwapTokensAtAmount(uint256 newAmount) external onlyAuthorized {
        // Swap amount cannot be lower than 0.001% total supply.
        if(newAmount < totalSupply() / 100000) revert SwapAmountTooLow();
        // Swap amount cannot be higher than 0.5% total supply.
        if(newAmount > (totalSupply() * 5) / 1000) revert SwapAmountTooHigh();
        swapTokensAtAmount = newAmount;
    }

    function updateMaxTxnAmount(uint256 newNum) external onlyAuthorized {
        // Cannot set maxTransactionAmount lower than 0.1%
        if(newNum < ((totalSupply()) / 1000) / 1e18) revert MaxTransactionAmountTooLow();
        maxTransactionAmount = newNum * (10**18);
    }

    function updateMaxWalletAmount(uint256 newNum) external onlyAuthorized {
        // Cannot set maxWallet lower than 0.5%
        if(newNum < ((totalSupply() * 5) / 1000) / 1e18) revert MaxWalletAmountTooLow();
        maxWallet = newNum * (10**18);
    }

    function excludeFromMaxTransaction(address updAds, bool excluded) public onlyAuthorized {
        _isExcludedMaxTransactionAmount[updAds] = excluded;
    }

    // Enables fees sent to dev, marketing, and liquidity. Does not affect transfers or selling/buying
    function updateSwapEnabled(bool enabled) external onlyAuthorized {
        swapEnabled = enabled;
    }

    // Fees where 10000 = 100% and 1 = 0.01%
    function updateBuyFees(uint256 _marketingFee, uint256 _liquidityFee, uint256 _devFee) external onlyAuthorized {
        buyMarketingFee = _marketingFee;
        buyLiquidityFee = _liquidityFee;
        buyDevFee = _devFee;
        buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;
        // Must keep fees at 11% or less
        if(buyTotalFees > MAX_BUY_FEE_PERCENT) revert FeeTooHigh();
    }

    function updateSellFees(uint256 _marketingFee, uint256 _liquidityFee, uint256 _devFee) external onlyAuthorized {
        sellMarketingFee = _marketingFee;
        sellLiquidityFee = _liquidityFee;
        sellDevFee = _devFee;
        sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;
        // Must keep fees at 11% or less
        if(sellTotalFees > MAX_SELL_FEE_PERCENT) revert FeeTooHigh();
    }

    function excludeFromFees(address account, bool excluded) public onlyAuthorized {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    // This will never be used
    function setAutomatedMarketMakerPair(address pair, bool value) external onlyAuthorized {
        // The pair cannot be removed from automatedMarketMakerPairs
        if(pair == uniswapV2Pair) revert PairNotAllowed();
        _setAutomatedMarketMakerPair(pair, value);
    }

    function _setAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    // This will never be used
    function updateMarketingWallet(address newMarketingWallet) external onlyAuthorized {
        emit marketingWalletUpdated(newMarketingWallet, marketingWallet);
        marketingWallet = newMarketingWallet;
    }

    // This will never be used
    function updateDevWallet(address newWallet) external onlyAuthorized {
        emit devWalletUpdated(newWallet, devWallet);
        devWallet = newWallet;
    }

    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    function _transfer(address from, address to, uint256 amount) internal override {
        // ERC20: transfer from the zero address. This will never happen
        if(from == address(0)) revert TransferFromZeroAddress();
        // ERC20: transfer to the zero address
        if(to == address(0)) revert TransferToZeroAddress();

        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }
        if (limitsInEffect) {
            address owner_ = owner();
            address operator_ = operator;
            if (from != owner_ &&
                to != owner_ &&
                from != operator_ &&
                to != operator_ &&
                to != address(0) &&
                to != DEAD_ADDRESS &&
                !swapping) {
                if (!tradingActive) {
                    // "Trading is not active."
                    if(!_isExcludedFromFees[from] && !_isExcludedFromFees[to]) revert TradingNotActive();
                }
                if (transferDelayEnabled) {
                    if (to != owner_ &&
                        to != operator_ &&
                        to != ROUTER &&
                        to != uniswapV2Pair) {
                        // Transfer Delay enabled. Only one purchase per block allowed.
                        if(_holderLastTransferTimestamp[tx.origin] >= block.number) revert OneTransferPerBlock();
                        _holderLastTransferTimestamp[tx.origin] = block.number;
                    }
                }
                if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
                    // Buy transfer amount exceeds the maxTransactionAmount.
                    if(amount > maxTransactionAmount) revert BuyAmountTooHigh();
                    // Max wallet exceeded
                    if(amount + balanceOf(to) > maxWallet) revert MaxWalletAmount();
                } else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
                    // Sell transfer amount exceeds the maxTransactionAmount.
                    if(amount > maxTransactionAmount) revert SellAmountTooHigh();
                } else if (!_isExcludedMaxTransactionAmount[to]) {
                    // Max wallet exceeded
                    if(amount + balanceOf(to) > maxWallet) revert MaxWalletAmount();
                }
            }
        }
        uint256 contractTokenBalance = balanceOf(address(this));
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;
        if (canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
            swapping = true;
            swapBack();
            swapping = false;
        }
        if (!swapping && automatedMarketMakerPairs[to] && lpBurnEnabled && block.timestamp >= lastLpBurnTime + lpBurnFrequency && !_isExcludedFromFees[from]) {
            autoBurnLiquidityPairTokens();
        }
        bool takeFee = !swapping;
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }
        uint256 fees;
        if (takeFee) {
            if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
                fees = (amount * sellTotalFees) / 10000;
                tokensForLiquidity += (fees * sellLiquidityFee) / sellTotalFees;
                tokensForDev += (fees * sellDevFee) / sellTotalFees;
                tokensForMarketing += (fees * sellMarketingFee) / sellTotalFees;
            } else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
                fees = (amount * buyTotalFees) / 10000;
                tokensForLiquidity += (fees * buyLiquidityFee) / buyTotalFees;
                tokensForDev += (fees * buyDevFee) / buyTotalFees;
                tokensForMarketing += (fees * buyMarketingFee) / buyTotalFees;
            }
            if (fees > 0) {
                super._transfer(from, address(this), fees);
            }
            amount -= fees;
        }
        super._transfer(from, to, amount);
    }

    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = WETH;
        _approve(address(this), ROUTER, tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    // this will never be used
    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), ROUTER, tokenAmount);
        uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            DEAD_ADDRESS,
            block.timestamp
        );
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = tokensForLiquidity + tokensForMarketing + tokensForDev;
        bool success;
        if (contractBalance == 0 || totalTokensToSwap == 0) {
            return;
        }
        if (contractBalance > swapTokensAtAmount * 20) {
            contractBalance = swapTokensAtAmount * 20;
        }
        uint256 liquidityTokens = (contractBalance * tokensForLiquidity) / totalTokensToSwap / 2;
        uint256 amountToSwapForETH = contractBalance - liquidityTokens;
        uint256 initialETHBalance = address(this).balance;
        swapTokensForEth(amountToSwapForETH);
        uint256 ethBalance = address(this).balance - initialETHBalance;
        uint256 ethForMarketing = (ethBalance * tokensForMarketing) / totalTokensToSwap;
        uint256 ethForDev = (ethBalance * tokensForDev) / totalTokensToSwap;
        uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForDev;
        tokensForLiquidity = 0;
        tokensForMarketing = 0;
        tokensForDev = 0;
        (success, ) = address(devWallet).call{value: ethForDev}("");
        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            addLiquidity(liquidityTokens, ethForLiquidity);
            emit SwapAndLiquify(amountToSwapForETH, ethForLiquidity, tokensForLiquidity);
        }
        (success, ) = address(marketingWallet).call{value: address(this).balance}("");
    }

    // Allow for adjustment of frequency of auto burn and auto burn percent
    function setAutoLPBurnSettings(uint256 _frequencyInSeconds, uint256 _percent, bool _enabled) external onlyAuthorized {
        // cannot set buyback more often than every 10 minutes
        if(_frequencyInSeconds < 600) revert BuyBackTooOften();
        // Must set auto LP burn percent between 0% and 10%
        if(_percent > 1000) revert BurnPercentTooHigh();
        lpBurnFrequency = _frequencyInSeconds;
        percentForLPBurn = _percent;
        lpBurnEnabled = _enabled;
    }

    // burns lp tokens
    function autoBurnLiquidityPairTokens() internal {
        lastLpBurnTime = block.timestamp;
        uint256 amountToBurn = (balanceOf(uniswapV2Pair) * percentForLPBurn) / 10000;
        if (amountToBurn > 0) {
            super._transfer(uniswapV2Pair, DEAD_ADDRESS, amountToBurn);
        }
        IUniswapV2Pair(uniswapV2Pair).sync();
        emit AutoNukeLP();
    }

    // Allow for manual burn of lp
    function manualBurnLiquidityPairTokens(uint256 percent) external onlyAuthorized {
        // Must wait for cooldown to finish
        if(block.timestamp <= lastManualLpBurnTime + manualBurnFrequency) revert BurnTooSoon();
        // May not nuke more than 10% of tokens in LP
        if(percent > 1000) revert BurnPercentTooHigh();
        lastManualLpBurnTime = block.timestamp;
        uint256 amountToBurn = (balanceOf(uniswapV2Pair) * percent) / 10000;
        if (amountToBurn > 0) {
            super._transfer(uniswapV2Pair, DEAD_ADDRESS, amountToBurn);
        }
        IUniswapV2Pair(uniswapV2Pair).sync();
        emit ManualNukeLP();
    }
}