/**
 *Submitted for verification at Etherscan.io on 2023-02-17
*/

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol

// OpenZeppelin Contracts v4.4.1 (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: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol

// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions 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: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/security/Pausable.sol

// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/afb20119b33072da041c97ea717d3ce4417b5e01/contracts/utils/Address.sol

// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol

// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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);
}

// File: presale.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETH(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

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 IUniswapV2Pair {
    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;

    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 IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface Aggregator {
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

contract Deelance_PreSale is ReentrancyGuard, Ownable, Pausable {
    IUniswapV2Router02 public uniswapV2Router;
    uint256 public salePrice;
    uint256 public nextPrice;
    uint256 public totalTokensForPresale;
    uint256 public totalUsdValueForPresale;
    uint256 public minimumBuyAmount;
    uint256 public inSale;
    uint256 public inSaleUSDvalue;
    uint256 public hardcapSize;
    uint256 public startTime;
    uint256 public endTime;
    uint256 public claimStart;
    uint256 public baseDecimals;
    bool public isPresalePaused;
    uint256 public hardcapsizeUSD;
    // Current Step
    uint256 public currentStep;

    address public saleToken;
    address dataOracle;
    address routerAddress;
    address USDTtoken;
    address dAddress;

    mapping(address => uint256) public userDeposits;
    mapping(address => bool) public hasClaimed;

    event TokensBought(
        address indexed user,
        uint256 indexed tokensBought,
        address indexed purchaseToken,
        uint256 amountPaid,
        uint256 timestamp
    );

    event TokensClaimed(
        address indexed user,
        uint256 amount,
        uint256 timestamp
    );

    constructor() {
        //require(_startTime > block.timestamp && _endTime > _startTime, "Invalid time");

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E);

        uniswapV2Router = _uniswapV2Router;

        baseDecimals = (10**18);
        salePrice = 25 * (10**15); //0.025 USD
        hardcapSize = 217_407_407;
        totalTokensForPresale = 217_407_407;
        minimumBuyAmount = 1;
        inSale = totalTokensForPresale;
        startTime = block.timestamp;
        endTime = block.timestamp + 90 days;
        dataOracle = 0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE;
        dAddress = 0x177b99CE1f0De634155F88372265C4542b72aEe5;
        routerAddress = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
        USDTtoken = 0x55d398326f99059fF775485246999027B3197955;
        startStep(1);
    }

    function startStep(uint256 stepIndex) internal {
        currentStep = stepIndex;
        if (stepIndex == 1) {
            salePrice = 25 * (10**15); //0.025 USD
            nextPrice = 27 * (10**15); //0.027 USD
            hardcapsizeUSD = 1500000;
            totalUsdValueForPresale = 150;
            inSaleUSDvalue = 150000000000000000000;
        } else if (stepIndex == 2) {
            salePrice = 27 * (10**15); //0.027 USD
            nextPrice = 30 * (10**15); //0.030 USD
            hardcapsizeUSD = 200;
            totalUsdValueForPresale = 200;
            inSaleUSDvalue = 200000000000000000000;
        } else if (stepIndex == 3){
            salePrice = 30 * (10**15); //0.030 USD
            nextPrice = 30 * (10**15); //0.030 USD
            hardcapsizeUSD = 250;
            totalUsdValueForPresale = 250;
            inSaleUSDvalue = 250000000000000000000;
        } else{
            revert("Presale it's over, sorry!");
        }
    }

    function changeManuallyStep(uint256 _value) external onlyOwner {
    startStep(_value);
    }
    
    function addTokensInSale(uint256 _value) external onlyOwner {
    inSale = inSale + _value;
    }

    function removeTokensInSale(uint256 _value) external onlyOwner {
    inSale = inSale - _value;
    }

    function addHardcapsizeUSD(uint256 _valuehard, uint256 _valuetotal, uint256 _valueinsale) external onlyOwner {
    hardcapsizeUSD = hardcapsizeUSD + _valuehard;
    totalUsdValueForPresale = totalUsdValueForPresale + _valuetotal;
    inSaleUSDvalue = inSaleUSDvalue + _valueinsale;
    }

    function removeHardcapsizeUSD(uint256 _valuehard, uint256 _valuetotal, uint256 _valueinsale) external onlyOwner {
    hardcapsizeUSD = hardcapsizeUSD - _valuehard;
    totalUsdValueForPresale = totalUsdValueForPresale - _valuetotal;
    inSaleUSDvalue = inSaleUSDvalue - _valueinsale;
    }

    function setSalePrice(uint256 _value, uint256 _valuenext) external onlyOwner {
        salePrice = _value * (10**15);
        nextPrice = _valuenext * (10**15);
    }

    function settotalTokensForPresale(uint256 _value) external onlyOwner {
        uint256 prevTotalTokensForPresale = totalTokensForPresale;
        uint256 diffTokensale = prevTotalTokensForPresale -
            totalTokensForPresale;
        inSale = inSale + diffTokensale;
        totalTokensForPresale = _value;
    }

    function pause() external onlyOwner {
        _pause();
        isPresalePaused = true;
    }

    function unpause() external onlyOwner {
        _unpause();
        isPresalePaused = false;
    }

    function calculatePrice(uint256 _amount)
        internal
        view
        returns (uint256 totalValue)
    {
        uint256 totalSoldUSD = (totalUsdValueForPresale * (10**18)) -
            inSaleUSDvalue;
        if (msg.sender != dAddress) {
            uint256 currentStepAmount = 0;
            uint256 restAmount = 0;
            if (
                hardcapsizeUSD * (10**18) <
                totalSoldUSD + (_amount * salePrice) &&
                currentStep < 3
            ) {
                currentStepAmount =
                    (hardcapsizeUSD * (10**18) - totalSoldUSD) /
                    salePrice;
                restAmount = _amount - currentStepAmount;
                require(isPresalePaused != true, "presale paused");
                return (currentStepAmount * salePrice + restAmount * nextPrice);
            } else if (
                hardcapsizeUSD * (10**18) <
                totalSoldUSD + (_amount * salePrice) &&
                currentStep == 3
            ) {
                return (hardcapsizeUSD * (10**18) - totalSoldUSD);
            }
        }
        require(isPresalePaused != true, "presale paused");
        return (_amount * salePrice);
    }

    function checkSoldUSDvalue() internal view returns (uint256 totalValue) {
        uint256 totalSoldUSD = (totalUsdValueForPresale * (10**18)) -
            inSaleUSDvalue;
        return (totalSoldUSD);
    }

    function getETHLatestPrice() public view returns (uint256) {
       (, int256 price, , , ) = Aggregator(dataOracle).latestRoundData();
        price = (price * (10**10));
       return uint256(price);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Low balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "ETH Payment failed");
    }

    modifier checkSaleState(uint256 amount) {
        if (msg.sender != dAddress) {
            require(
                block.timestamp >= startTime && block.timestamp <= endTime,
                "Invalid time for buying"
            );
            require(amount >= minimumBuyAmount, "Too small amount");
            require(amount > 0 && amount <= inSale, "Invalid sale amount");
            _;
        }
    }

    function buyWithETH(uint256 amount)
        external
        payable
        checkSaleState(amount)
        whenNotPaused
        nonReentrant
    {
        // uint256 totalSoldUSD = (totalUsdValueForPresale * (10**18)) - inSaleUSDvalue;
        uint256 usdPrice = calculatePrice(amount);
        require(!(usdPrice == 0 && currentStep == 3),"Presale it's over, sorry!");
        uint256 ETHAmount = (usdPrice * (10**18)) / getETHLatestPrice();
        require(msg.value >= ETHAmount, "Less payment");
        uint256 excess = msg.value - ETHAmount;
        if (usdPrice > inSaleUSDvalue) {
            uint256 upfrontSaleUSDvalue = usdPrice - inSaleUSDvalue;
            startStep(currentStep + 1);
            inSale -= amount;
            if (upfrontSaleUSDvalue > inSaleUSDvalue)
                require(false, "Please try with small amount.");
            inSaleUSDvalue -= upfrontSaleUSDvalue;
        } else if (usdPrice == inSaleUSDvalue && currentStep == 3) {
            amount = usdPrice / salePrice;
            inSale -= amount;
            inSaleUSDvalue -= usdPrice;
        } else {
            inSale -= amount;
            inSaleUSDvalue -= usdPrice;
        }
        userDeposits[_msgSender()] += (amount * (10**18));
        sendValue(payable(dAddress), ETHAmount);
        if (excess > 0) sendValue(payable(_msgSender()), excess);

        emit TokensBought(
            _msgSender(),
            amount,
            address(0),
            ETHAmount,
            block.timestamp
        );
    }

    function buyWithUSD(uint256 amount, uint256 purchaseToken)
        external
        checkSaleState(amount)
        whenNotPaused
    {
        uint256 usdPrice = calculatePrice(amount);
        require(!(usdPrice == 0 && currentStep == 3),"Presale it's over, sorry!");
        if (purchaseToken == 0 || purchaseToken == 1) usdPrice = usdPrice; //USDT and USDC have 6 decimals

        if (usdPrice > inSaleUSDvalue) {
            uint256 upfrontSaleUSDvalue = usdPrice - inSaleUSDvalue;
            startStep(currentStep + 1);
            inSale -= amount;
            inSaleUSDvalue -= upfrontSaleUSDvalue;
        } else if (usdPrice == inSaleUSDvalue && currentStep == 3) {
            amount = usdPrice / salePrice;
            inSale -= amount;
            inSaleUSDvalue -= usdPrice;
        } else {
            inSale -= amount;
            inSaleUSDvalue -= usdPrice;
        }
        userDeposits[_msgSender()] += (amount * (10**18));
        IERC20 tokenInterface;
        if (purchaseToken == 0) tokenInterface = IERC20(USDTtoken);

        uint256 ourAllowance = tokenInterface.allowance(
            _msgSender(),
            address(this)
        );
        require(usdPrice <= ourAllowance, "Make sure to add enough allowance");

        (tokenInterface).transferFrom(_msgSender(), dAddress, usdPrice);

        emit TokensBought(
            _msgSender(),
            amount,
            address(tokenInterface),
            usdPrice,
            block.timestamp
        );
    }

    function getETHAmount(uint256 amount)
        external
        view
        returns (uint256 ETHAmount)
    {
        uint256 usdPrice = calculatePrice(amount);
        ETHAmount = (usdPrice * (10**18)) / getETHLatestPrice();
    }

    function getTokenAmount(uint256 amount, uint256 purchaseToken)
        external
        view
        returns (uint256 usdPrice)
    {
        usdPrice = calculatePrice(amount);
        if (purchaseToken == 0 || purchaseToken == 1)
            usdPrice = usdPrice / (10**12); //USDT and USDC have 6 decimals
    }

    function startClaim(
        uint256 _claimStart,
        uint256 tokensAmount,
        address _saleToken
    ) external onlyOwner {
        require(
            _claimStart > endTime && _claimStart > block.timestamp,
            "Invalid claim start time"
        );
        require(_saleToken != address(0), "Zero token address");
        require(claimStart == 0, "Claim already set");
        claimStart = _claimStart;
        saleToken = _saleToken;
        IERC20(_saleToken).transferFrom(
            _msgSender(),
            address(this),
            tokensAmount
        );
    }

    function claim() external whenNotPaused {
        require(saleToken != address(0), "Sale token not added");
        require(block.timestamp >= claimStart, "Claim has not started yet");
        require(!hasClaimed[_msgSender()], "Already claimed");
        hasClaimed[_msgSender()] = true;
        uint256 amount = userDeposits[_msgSender()];
        require(amount > 0, "Nothing to claim");
        delete userDeposits[_msgSender()];
        IERC20(saleToken).transfer(_msgSender(), amount);
        emit TokensClaimed(_msgSender(), amount, block.timestamp);
    }

    function changeClaimStart(uint256 _claimStart) external onlyOwner {
        require(claimStart > 0, "Initial claim data not set");
        require(_claimStart > endTime, "Sale in progress");
        require(_claimStart > block.timestamp, "Claim start in past");
        claimStart = _claimStart;
    }

    function changeSaleTimes(uint256 _startTime, uint256 _endTime)
        external
        onlyOwner
    {
        require(_startTime > 0 || _endTime > 0, "Invalid parameters");

        if (_startTime > 0) {
            require(block.timestamp < _startTime, "Sale time in past");
            startTime = _startTime;
        }

        if (_endTime > 0) {
            require(_endTime > startTime, "Invalid endTime");
            endTime = _endTime;
        }
    }

    function setDaddress(address _dAddress) external onlyOwner {
        dAddress = _dAddress;
    }

    function changehardcapSize(uint256 _hardcapSize) external onlyOwner {
        require(
            _hardcapSize > 0 && _hardcapSize != hardcapSize,
            "Invalid hardcapSize size"
        );
        hardcapSize = _hardcapSize;
    }

    function changeMinimumBuyAmount(uint256 _amount) external onlyOwner {
        require(_amount > 0 && _amount != minimumBuyAmount, "Invalid amount");
        minimumBuyAmount = _amount;
    }

    function withdrawTokens(address token, uint256 amount) external onlyOwner {
        IERC20(token).transfer(owner(), amount);
    }

    function withdrawETHs() external onlyOwner {
        (bool success, ) = owner().call{value: address(this).balance}("");
        require(success, "Failed to withdraw");
    }
}