// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @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 {
        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);
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @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.zeppelin.solutions/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 Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - 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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    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);
    }

    /** @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 {
        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);
    }

    /**
     * @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 {
        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);
    }

    /**
     * @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 {
        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);
    }

    /**
     * @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 {}
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @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);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// File: @openzeppelin/contracts/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    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);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol



pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    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(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol



pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint 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 (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    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 (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol



pragma solidity >=0.6.2;

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);
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

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;
}

// File: contracts/Ever.sol



/**

* All Time High - algorithmic ERC20 token with constant growth formula

Website: https://athprotocol.com/
Twitter : https://twitter.com/ATHprotocol
Telegram: https://t.me/ATH_Protocol

*/

pragma solidity 0.8.10;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";

interface Hodl {
    function getBalance() external view returns (uint256);
    function sendReward(address to, uint256 amount) external returns (bool result);
}

contract Ever is ERC20, Ownable {
    using SafeMath for uint256;
    Hodl private _hodler;
    IUniswapV2Router02 private _uniswapV2Router;
    address private _uniswapV2Pair;
    address public _usdc = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
    address public _router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address public _uniswapV3Router = 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45;
    address public _feeWallet;

    uint256 public _supportLevel;
    uint256 public _floorSellFee;
    uint256 public _marketingFee;
    uint256 public _liquidityFee;
    uint256 public _tokensForLiquidity;
    uint256 public _supportPercentBelowATH;
    uint256 public _addLiquidityAtAmount;
    uint256 public _maxWallet;

    bool public _tradingActive;
    bool public _limitsInEffect;
    bool private _isSwappingBack;

    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) private _isExcludedFromMaxWallet;
    mapping(address => bool) private _isNonUniswapExchange;
    mapping(address => bool) private _isBlackListedSender;
    mapping(address => bool) private _isBlackListed;

    event IsBuy(address indexed msgSender, address from, address to, uint256 tokensAmount, uint256 newUsdcBalance);
    event IsSell(address indexed msgSender, address from, address to, uint256 tokensAmount, uint256 newUsdcBalance);
    event IsLiquidityOperation(address indexed msgSender, address from, address to, uint256 tokensAmount, uint256 newUsdcBalance);
    event LiquidityAdded(uint256 usdcAmount, uint256 tokenAmount);
    event ExcludeFromFees(address indexed account, bool isExcluded);

    constructor() ERC20("ATH Protocol", "ATH") {
        _uniswapV2Router = IUniswapV2Router02(_router);
        _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _usdc);
        _supportLevel = 0;
        _supportPercentBelowATH = 5;
        _floorSellFee = 30;
        _marketingFee = 2;
        _liquidityFee = 1;
        _addLiquidityAtAmount = 1000e18;
    }

    function init(address hodler, address owner) public onlyOwner {
        require(owner != address(0), "Address doesn't exist");

        _hodler = Hodl(hodler);
        _feeWallet = address(owner);
        excludeFromFees(address(owner), true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);

        uint256 totalSupply = 21e6 * 1e18;
        _maxWallet = totalSupply * 3 / 100;

        _mint(owner, totalSupply);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(!_isBlackListed[to] || !_isBlackListed[from], "Address is blacklisted");
        require(!_isBlackListedSender[msg.sender], "msg.sender is blacklisted");

        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        (bool isSell, bool isBuy, bool isLiquidityOperation) = getTransactionType(from, to, amount);

        if (isLiquidityOperation || _isSwappingBack) {
            super._transfer(from, to, amount);
            return;
        }

        bool isSwap = isBuy || isSell;
        bool isExcludedFromFee = _isExcludedFromFees[from] || _isExcludedFromFees[to];

        if(!_tradingActive && !isExcludedFromFee && isSwap) require(false, "Trading is not yet active");

        bool shouldTakeFee = _tradingActive && isSwap;
        if (isExcludedFromFee) shouldTakeFee = false;

        (uint buyerRewardInUSDC, uint sellFeeInUSDC, uint tokensForLiquidity, uint tokensForMarketing) = calculateNewLevel(amount, isBuy);

        uint transferableAmount = amount;
        uint tokensToSellForRewards = 0;
        if (shouldTakeFee) {
            if (tokensForMarketing > 0 || tokensForLiquidity > 0) {
                super._transfer(from, _feeWallet, tokensForMarketing);
                super._transfer(from, address(this), tokensForLiquidity);
                _tokensForLiquidity += tokensForLiquidity;
                transferableAmount -= tokensForMarketing.add(tokensForLiquidity);
            }
            if (sellFeeInUSDC > 0) {
                tokensToSellForRewards = getAmountOutForUsdcSell(sellFeeInUSDC);
                super._transfer(from, address(this), tokensToSellForRewards);
                transferableAmount -= tokensToSellForRewards;
            }
        }

        if(_limitsInEffect && (!isExcludedFromFee || !_isExcludedFromMaxWallet[to])) {
            if(isBuy || !isSwap) require(transferableAmount + balanceOf(to) <= _maxWallet, "Max wallet exceeded");
        }

        if (isSell && !_isSwappingBack) {
            _isSwappingBack = true;
            swapBack(tokensToSellForRewards);
            _isSwappingBack = false;
        }

        if (!isSwap && !isLiquidityOperation && !isExcludedFromFee && _tokensForLiquidity >= _addLiquidityAtAmount) {
                bool added = addLiquidity(_tokensForLiquidity);
                if(added) _tokensForLiquidity = 0;
        }

        if (buyerRewardInUSDC > 0) {
            _hodler.sendReward(to, buyerRewardInUSDC);
        }

        super._transfer(from, to, transferableAmount);
    }

    function getTransactionType(address from, address to, uint256 amount) private returns (bool, bool, bool) {
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(_uniswapV2Pair).getReserves();
        uint newUsdcBalance = ERC20(_usdc).balanceOf(_uniswapV2Pair);

        bool isBuy = from == _uniswapV2Pair && to != address(_uniswapV2Router);
        bool isSell = false;
        bool isLiquidityOperation = false;

        if (_isNonUniswapExchange[msg.sender]) {
            isBuy = from == _uniswapV2Pair;
            isSell = to == _uniswapV2Pair;
        } else {
            if ((msg.sender == address(_uniswapV2Router) || msg.sender == address(_uniswapV3Router)) && to == _uniswapV2Pair) {
                if (newUsdcBalance > reserve0) isLiquidityOperation = true;
                else isSell = true;
            }

            if (newUsdcBalance < reserve0 && to != _uniswapV2Pair) {
                if (isBuy) {
                    isLiquidityOperation = true;
                    isBuy = false;
                }
            }
        }

        if (isBuy) emit IsBuy(msg.sender, from, to, amount, newUsdcBalance);
        if (isSell) emit IsSell(msg.sender, from, to, amount, newUsdcBalance);
        if (isLiquidityOperation) emit IsLiquidityOperation(msg.sender, from, to, amount, newUsdcBalance);

        return (isSell, isBuy, isLiquidityOperation);
    }

    function getAmountOutForUsdcSell(uint usdcIn) internal returns (uint tokensReceived) {
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(_uniswapV2Pair).getReserves();
        tokensReceived = getAmountIn(usdcIn, reserve1, reserve0);
    }

    function getNewPrice(bool isBuy, uint amount) internal returns (uint, uint) {
        uint newPrice = 0;
        uint usdcSpent = 0;
        uint usdcReceived = 0;
        uint usdcFee = 0;
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(_uniswapV2Pair).getReserves();
        if (isBuy) {
            usdcSpent = getAmountIn(amount, reserve0, reserve1);
            newPrice = getAmountOut(1e18, reserve1.sub(amount), reserve0.add(usdcSpent));
        } else {
            usdcReceived = getAmountOut(amount, reserve1, reserve0);
            newPrice = getAmountOut(1e18, reserve1.add(amount), reserve0.sub(usdcReceived));
            usdcFee = usdcReceived.mul(_floorSellFee).div(100);
        }
        return (newPrice, usdcFee);
    }

    function calculateNewLevel(uint amount, bool isBuy) internal returns (uint, uint, uint, uint) {
        (uint newPrice, uint usdcFee) = getNewPrice(isBuy, amount);
        uint currentPrice = getCurrentPrice();

        uint buyerRewardInUSDC = 0;
        uint sellFeeInUSDC = 0;
        uint tokensForLiquidity = 0;
        uint tokensForMarketing = 0;

        if (newPrice < _supportLevel) {
            if (isBuy) {
                uint priceMovePercentage = newPrice.sub(currentPrice).mul(100000000).div(_supportLevel.sub(currentPrice));
                uint usdcRewardsBank = _hodler.getBalance();
                if (usdcRewardsBank > 0) {
                    buyerRewardInUSDC = priceMovePercentage.mul(usdcRewardsBank).div(100000000);
                }
            } else {
                sellFeeInUSDC = usdcFee;
            }
        } else if (newPrice >= _supportLevel && currentPrice < _supportLevel) {
            buyerRewardInUSDC = _hodler.getBalance();
        } else {
            uint256 numerator = amount.div(100);
            tokensForLiquidity = numerator.mul(_liquidityFee);
            tokensForMarketing = numerator.mul(_marketingFee);
        }

        if (newPrice > _supportLevel) {
            uint tempSupport = newPrice.sub(newPrice.div(100).mul(_supportPercentBelowATH));
            if (tempSupport > _supportLevel) _supportLevel = tempSupport;
        }

        return (buyerRewardInUSDC, sellFeeInUSDC, tokensForLiquidity, tokensForMarketing);
    }

    function swapBack(uint tokenAmount) private {
        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance == 0 || tokenAmount == 0) return;

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _usdc;

        _approve(address(this), address(_uniswapV2Router), tokenAmount);

        _uniswapV2Router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(_hodler),
            block.timestamp
        );
    }

    function getCurrentPrice() public view returns (uint price) {
        (uint256 reserve0, uint256 reserve1,) = IUniswapV2Pair(_uniswapV2Pair).getReserves();
        price = getAmountOut(1e18, reserve1, reserve0);
    }

    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

    function addLiquidity(uint256 tokenAmount) private returns (bool) {
        if (tokenAmount > balanceOf(address(this))) return false;

        uint256 tokensToBeAdded = tokenAmount.div(2);

        uint256 myUSDCBefore = ERC20(_usdc).balanceOf(address(_hodler));
        _isSwappingBack = true;
        swapBack(tokensToBeAdded);
        _isSwappingBack = false;
        uint256 myUSDCAfter = ERC20(_usdc).balanceOf(address(_hodler));
        uint256 usdcToAdd = myUSDCAfter.sub(myUSDCBefore);
        _hodler.sendReward(address(this), usdcToAdd);

        _approve(address(this), address(_uniswapV2Router), tokensToBeAdded);
        ERC20(_usdc).approve(address(_uniswapV2Router), usdcToAdd);

        _uniswapV2Router.addLiquidity(
            address(_usdc),
            address(this),
            usdcToAdd,
            tokensToBeAdded,
            0,
            0,
            _feeWallet,
            block.timestamp
        );

        emit LiquidityAdded(usdcToAdd, tokensToBeAdded);
        return true;
    }

    function enableTrading() public onlyOwner {
        _tradingActive = true;
        _limitsInEffect = true;
        _supportLevel = getCurrentPrice();
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
    }

    function excludeFromMaxWallet(address account, bool excluded) public onlyOwner {
        _isExcludedFromMaxWallet[account] = excluded;
    }

    function setLimitsInEffect(bool limitsInEffect) public onlyOwner {
        _limitsInEffect = limitsInEffect;
    }

    function setFeeWallet(address feeWallet) public onlyOwner {
        _feeWallet = feeWallet;
    }

    function setSupportLevel(uint256 supportLevel) public onlyOwner {
        _supportLevel = supportLevel;
    }

    function setNonUniswapExchange(address account, bool exists) public onlyOwner {
        _isNonUniswapExchange[account] = exists;
    }

    function setFloorSellFee(uint256 floorSellFee) public onlyOwner {
        _floorSellFee = floorSellFee;
    }

    function setSupportPercentBelowATH(uint256 supportPercentBelowATH) public onlyOwner {
        _supportPercentBelowATH = supportPercentBelowATH;
    }

    function setAddLiquidityAtAmount(uint256 addLiquidityAtAmount) public onlyOwner {
        _addLiquidityAtAmount = addLiquidityAtAmount;
    }

    function SetUniswapV3Router(address uniswapV3Router) public onlyOwner {
        _uniswapV3Router = uniswapV3Router;
    }

    function setTokensForLiquidity(uint256 tokensForLiquidity) public onlyOwner {
        _tokensForLiquidity = tokensForLiquidity;
    }

    function setBlackListed(address sender, bool exists) public onlyOwner {
        _isBlackListed[sender] = exists;
    }

    function setBlackListedSender(address sender, bool exists) public onlyOwner {
        _isBlackListedSender[sender] = exists;
    }

    function setHodler(address hodler) public onlyOwner {
        _hodler = Hodl(hodler);
    }

    function rescue(address token) public onlyOwner {
        ERC20 Token = ERC20(token);
        uint256 balance = Token.balanceOf(address(this));
        if(balance > 0) Token.transfer(_msgSender(), balance);
    }

    function setFees(uint256 marketingFee, uint256 liquidityFee) public onlyOwner {
        require(marketingFee.add(liquidityFee) <= 10, "Fees can't be greater than 10%");
        _marketingFee = marketingFee;
        _liquidityFee = liquidityFee;
    }

    function setMaxWalletAmount(uint256 maxWallet) external onlyOwner {
        require(maxWallet >= (totalSupply() * 5 / 1000) / 1e18, "Cannot set maxWallet lower than 0.5%");
        _maxWallet = maxWallet * 1e18;
    }
}