// Sources flattened with hardhat v2.12.6 https://hardhat.org

// File contracts/dogemojiSale.sol

// SPDX-License-Identifier: MIT

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

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;
    }
}

// File: @openzeppelin/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: @openzeppelin/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: @openzeppelin/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: @openzeppelin/contracts/utils/Address.sol


// OpenZeppelin Contracts (last updated v4.8.0) (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 functionCallWithValue(target, data, 0, "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");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, 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) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or 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 {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // 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
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// File: @openzeppelin/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: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @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);
}


pragma solidity 0.8.9;








interface Aggregator {
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

contract dogemojiSale is Ownable, Pausable, ReentrancyGuard {

    uint256 public tokensSold;
    address public saleToken;
    uint256 public baseDecimals;
    uint256 public saleIndex;
    uint256 public totalTokens;

    bool public isActive;
    bool public claimStart;

    struct purchaseInfo {
        uint256 purchaseAmount;
        uint256 claimedAmount;
    }

    IERC20 public USDTInterface;
    Aggregator public priceFeed;
    // https://docs.chain.link/docs/ethereum-addresses/ => (ETH / USD)

    uint256[6] public tokenAmount;
    uint256[6] public tokenPrice;

    mapping(address => purchaseInfo) public userInfo;

    event SaleStateSet(bool indexed _state);

    event TokensBought(
        address indexed user,
        uint256 indexed tokensBought,
        address indexed purchaseToken,
        uint256 amountPaid,
        uint256 timestamp
    );

    event TokensAdded(
        address indexed token,
        uint256 noOfTokens,
        uint256 timestamp
    );
    event TokensClaimed(
        address indexed user,
        uint256 amount,
        uint256 timestamp
    );

    event ClaimStartUpdated(
        bool newValue,
        uint256 timestamp
    );

    constructor(address _aggregator, address _token, bool _saleState) {
        baseDecimals = (10**9);
        totalTokens = 5_000_000_000;
        tokenAmount = [1_575_931_232, 2_507_163_323, 3_223_495_701, 3_832_378_222, 4_376_790_829, 5_000_000_000];
        tokenPrice = [
            349000000000000,  // 0.000349 USD
            698000000000000,  // 0.000698 USD
            1047000000000000, // 0.001047 USD
            1396000000000000, // 0.001396 USD
            1745000000000000, // 0.001745 USD
            2094000000000000  // 0.002094 USD
        ];
        priceFeed = Aggregator(_aggregator);
        USDTInterface = IERC20(_token);
        isActive = _saleState;
        emit SaleStateSet(_saleState);
    }


    modifier saleState(uint256 amount) {
        require(isActive == true, 'Sale state Stopped');
        require(tokensSold <= totalTokens, 'Cap Reached');
        require(amount > 0, "Invalid sale amount");
        _;
    }

    // only owner && internal fuctions

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }

    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");
    }

    function changeSaleState(bool _state) external onlyOwner {
        isActive = _state;
    }

    function updateSaleIndex(uint256 _index) external onlyOwner {
        saleIndex = _index;
    }

    function initClaim(uint256 noOfTokens, address _saleToken) external onlyOwner returns (bool) {
        require(isActive == false, "sale still active");
        require(noOfTokens >= (tokensSold * baseDecimals), "Tokens less than sold");
        require(_saleToken != address(0), "Zero token address");
        saleToken = _saleToken;
        claimStart = true;
        bool success = IERC20(_saleToken).transferFrom(
            msg.sender,
            address(this),
            noOfTokens
        );
        require(success, "Token transfer failed");
        emit TokensAdded(saleToken, noOfTokens, block.timestamp);
        return true;
    }


    function changeClaimStart(bool _claimStart) external onlyOwner returns (bool) {
        claimStart = _claimStart;
        emit ClaimStartUpdated(_claimStart, block.timestamp);
        return true;
    }

    /*
    aggregator: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
    token: 0xdAC17F958D2ee523a2206206994597C13D831ec7
    */

    // public && external functions

    function claim() external whenNotPaused nonReentrant returns (bool) {
        require(saleToken != address(0), "Sale token not added");
        uint256 tokens = getClaimableAmount(msg.sender);
        require(tokens > 0, "No claimable tokens available");
        require(claimStart == true, 'Claim !started');
        userInfo[msg.sender].purchaseAmount = 0;
        userInfo[msg.sender].claimedAmount += tokens;

        bool success = IERC20(saleToken).transfer(
            msg.sender,
            tokens
        );
        require(success, "Token transfer failed");
        emit TokensClaimed(msg.sender, tokens, block.timestamp);
        return true;
    }


    function buyWithUSDT(uint256 amount) external saleState(amount) nonReentrant whenNotPaused returns (bool) {
        (uint256 usdPrice, uint256 tokensBought) = usdtBuyHelper(amount);
        tokensSold += tokensBought;
        uint256 formatted = usdPrice / (10**12);
        //uint256 price = formatted * (decimal);
        if (tokensSold >= tokenAmount[saleIndex]) {
            if (saleIndex + 1 < tokenPrice.length) {
                saleIndex++;
            }
        }

        uint256 ourAllowance = USDTInterface.allowance(
            msg.sender,
            address(this)
        );
        require(formatted <= ourAllowance, "Make sure to add enough allowance");
        (bool success, ) = address(USDTInterface).call(
            abi.encodeWithSignature(
                "transferFrom(address,address,uint256)",
                msg.sender,
                owner(),
                formatted
            )
        );
        require(success, "Token payment failed");
        purchaseInfo storage userDetails = userInfo[msg.sender];
        userDetails.purchaseAmount += (tokensBought * baseDecimals);
        emit TokensBought(
            msg.sender,
            amount,
            address(USDTInterface),
            usdPrice,
            block.timestamp
        );
        if(tokensSold >= tokenAmount[5]) {
         isActive = false;
       }
        return true;
    }

    function buyWithEth(uint256 amount) external payable saleState(amount) whenNotPaused nonReentrant returns (bool) {
       (uint256 ethAmount, uint256 tokensBought) = ethBuyHelper(amount);
        require(msg.value >= ethAmount, "Less payment");
        uint256 excess = msg.value - ethAmount;
        tokensSold += tokensBought;
        if (tokensSold >= tokenAmount[saleIndex]) {
            if (saleIndex + 1 < tokenPrice.length) {
                saleIndex++;
            }
        }

        sendValue(payable(owner()), ethAmount);
        if (excess > 0) sendValue(payable(msg.sender), excess);
        emit TokensBought(
            msg.sender,
            tokensBought,
            address(0),
            ethAmount,
            block.timestamp
        );

        purchaseInfo storage userDetails = userInfo[msg.sender];
        userDetails.purchaseAmount += (tokensBought * baseDecimals);
        if(tokensSold >= tokenAmount[5]) {
         isActive = false;
        }
        return true;
    }

    // read only functions

    function getLatestPrice() public view returns (uint256) {
        (, int256 price, , , ) = priceFeed.latestRoundData();
        uint256 adjustedPriceWei = uint256(price) / 1e8;
        return uint256(adjustedPriceWei);
    }

    function calculatePrice(uint256 _amount) public view returns (uint256 USDTAmount, uint256 boughtAmt) {

        if (_amount + tokensSold > tokenAmount[saleIndex]) {
            require(isActive == true, "Sale Closed.");
            uint256 tokensRemaining = tokenAmount[saleIndex] -
                tokensSold;
            USDTAmount =
                tokensRemaining *
                tokenPrice[saleIndex];
                boughtAmt = tokensRemaining;
        } else {
            USDTAmount = _amount * tokenPrice[saleIndex];
            boughtAmt = _amount;
        }
    }


    function ethBuyHelper(uint256 amount) public view returns (uint256 ethAmount, uint256 tokensBought) {
        uint256 ethWeiPrice = getLatestPrice();
        (uint256 usdPrice, uint256 tokenB) = calculatePrice(amount);
        ethAmount = (usdPrice) / ethWeiPrice;
        tokensBought = tokenB;
    }

    function usdtBuyHelper(uint256 amount) public view returns (uint256 usdPrice, uint256 tokensBought) {
        (uint256 usdP, uint256 tokenB) = calculatePrice(amount);
        usdPrice = usdP;
        tokensBought = tokenB;
    }

    function getClaimableAmount(address _user) public view returns (uint256 claimableAmount) {
        claimableAmount = userInfo[_user].purchaseAmount;

    }

    function withdraw(uint256 _withdrawalIndex) external onlyOwner{
        if(_withdrawalIndex == 0) {
        (bool success, ) = payable(owner()).call{value: address(this).balance}("");
        require(success, "ETH Withdrawal failed");
        } else {
            uint256 balance = USDTInterface.balanceOf(
            address(this)
        );
         (bool success, ) = address(USDTInterface).call(
            abi.encodeWithSignature(
                "transfer(address,uint256)",
                owner(),
                balance
            )
        );
        require(success, "Token payment failed");
        }
    }
}