//
//
// $$$$$$$$\                     $$\                           $$\       $$\    $$\                 $$\   $$\           $$\   $$\                     $$\        $$$$$$\    $$\                $$\                         
// $$  _____|                    $$ |                          $$ |      $$ |   $$ |                $$ |  $$ |          \__|  $$ |                    $$ |      $$  __$$\   $$ |               $$ |                        
// $$ |      $$$$$$$\   $$$$$$\  $$ | $$$$$$\  $$$$$$$\   $$$$$$$ |      $$ |   $$ | $$$$$$$\       $$ |  $$ |$$$$$$$\  $$\ $$$$$$\    $$$$$$\   $$$$$$$ |      $$ /  \__|$$$$$$\    $$$$$$\ $$$$$$\    $$$$$$\   $$$$$$$\ 
// $$$$$\    $$  __$$\ $$  __$$\ $$ | \____$$\ $$  __$$\ $$  __$$ |      \$$\  $$  |$$  _____|      $$ |  $$ |$$  __$$\ $$ |\_$$  _|  $$  __$$\ $$  __$$ |      \$$$$$$\  \_$$  _|   \____$$\\_$$  _|  $$  __$$\ $$  _____|
// $$  __|   $$ |  $$ |$$ /  $$ |$$ | $$$$$$$ |$$ |  $$ |$$ /  $$ |       \$$\$$  / \$$$$$$\        $$ |  $$ |$$ |  $$ |$$ |  $$ |    $$$$$$$$ |$$ /  $$ |       \____$$\   $$ |     $$$$$$$ | $$ |    $$$$$$$$ |\$$$$$$\  
// $$ |      $$ |  $$ |$$ |  $$ |$$ |$$  __$$ |$$ |  $$ |$$ |  $$ |        \$$$  /   \____$$\       $$ |  $$ |$$ |  $$ |$$ |  $$ |$$\ $$   ____|$$ |  $$ |      $$\   $$ |  $$ |$$\ $$  __$$ | $$ |$$\ $$   ____| \____$$\ 
// $$$$$$$$\ $$ |  $$ |\$$$$$$$ |$$ |\$$$$$$$ |$$ |  $$ |\$$$$$$$ |         \$  /   $$$$$$$  |      \$$$$$$  |$$ |  $$ |$$ |  \$$$$  |\$$$$$$$\ \$$$$$$$ |      \$$$$$$  |  \$$$$  |\$$$$$$$ | \$$$$  |\$$$$$$$\ $$$$$$$  |
// \________|\__|  \__| \____$$ |\__| \_______|\__|  \__| \_______|          \_/    \_______/        \______/ \__|  \__|\__|   \____/  \_______| \_______|       \______/    \____/  \_______|  \____/  \_______|\_______/ 
//                     $$\   $$ |                                                                                                                                                                                          
//                     \$$$$$$  |                                                                                                                                                                                          
//                      \______/                                                                                                                                                                                           
//
// $$\      $$\  $$$$$$\  $$$$$$$\                                                                                                                        
// $$ | $\  $$ |$$  __$$\ $$  __$$\                                                                                                                       
// $$ |$$$\ $$ |$$ /  \__|$$ |  $$ |                                                                                                                      
// $$ $$ $$\$$ |$$ |      $$$$$$$  |                                                                                                                      
// $$$$  _$$$$ |$$ |      $$  ____/                                                                                                                       
// $$$  / \$$$ |$$ |  $$\ $$ |                                                                                                                            
// $$  /   \$$ |\$$$$$$  |$$ |                                                                                                                            
// \__/     \__| \______/ \__|                                                                                                                            
                                                                                                                                                     
                                                                                                                                                   
// SPDX-License-Identifier: MIT

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/extensions/draft-IERC20Permit.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// 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/utils/SafeERC20.sol


// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @openzeppelin/contracts/interfaces/IERC20.sol


// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;


// 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: Betting.sol


pragma solidity ^0.8.9;


contract England_UnitedStates is Ownable {
    using SafeERC20 for IERC20;
    IERC20 public usdt;

    address public admin;

    uint256 public totalBetsA;
    uint256 public totalBetsB;
    uint256 public betAPerUser;
    uint256 public betBPerUser;
    uint256 public fee = 1e4; // 10%
    uint256 public finalBettingAmount;

    bool public startbet;

    mapping(address => uint256) public userBets;
    mapping(address => uint8) public userChoice;
    mapping(address => bool) public userClaimed;

    enum ResultStatus {
        NotDeclare, // 0
        WinnerA, // 1
        WinnerB, // 2
        Cancel, // 3
        Draw // 4
    }

    event VoteA(address indexed user, uint256 indexed amount);
    event VoteB(address indexed user, uint256 indexed amount);
    event Claim(address indexed user, uint256 indexed amount);
    event DeclareResult(uint256 indexed choice);

   ResultStatus resultStatus;
   
   modifier isStartbet() {
        require(startbet, "Betting not started yet");
        _;
    }

    modifier notDeclare() {
        require(resultStatus == ResultStatus.NotDeclare, "already delcare");
        _;
    }

    modifier minAmount(uint256 _amnt) {
        require(_amnt > 0, "bet value 0");
        _;
    }

    modifier declare() {
        require(resultStatus != ResultStatus.NotDeclare, "not delcare");
        _;
    }

    modifier notClaimed(address _user) {
        require(!userClaimed[_user], "claimed!");
        _;
    }

    constructor(address _admin, IERC20 _usdt) {
        admin = _admin;
        usdt = _usdt;
    }

    function voteA(uint256 _amount)
        external
        isStartbet
        notDeclare
        minAmount(_amount)
        returns (bool)
    {
        totalBetsA = totalBetsA + _amount;
        address _user = msg.sender;
        uint256 previousBet = userBets[_user];

        if (previousBet > 0) {
            require(userChoice[_user] == 1, "wrong choice");
            userBets[_user] += _amount;
        } else {
            userBets[_user] = _amount;
            userChoice[_user] = 1;
        }
        betAPerUser += 1;
        emit VoteA(_user, _amount);
        usdt.safeTransferFrom(_user, address(this), _amount);
        return true;
    }

    function voteB(uint256 _amount)
        external
        isStartbet
        notDeclare
        minAmount(_amount)
        returns (bool)
    {
        totalBetsB = totalBetsB + _amount;
        address _user = msg.sender;
        uint256 previousBet = userBets[_user];

        if (previousBet > 0) {
            require(userChoice[_user] == 2, "wrong choice");
            userBets[_user] += _amount;
        } else {
            userBets[_user] = _amount;
            userChoice[_user] = 2;
        }
        betBPerUser += 1;
        emit VoteB(_user, _amount);
        usdt.safeTransferFrom(_user, address(this), _amount);
        return true;
    }

    function declareResult(ResultStatus _result) external notDeclare onlyOwner {
        resultStatus = _result;
        emit DeclareResult(uint256(_result));
        if (
            _result != ResultStatus.Cancel && _result != ResultStatus.NotDeclare
        ) {
            uint256 totalBets = (totalBetsA + totalBetsB);
            uint256 feeAmount = (totalBets * fee) / 1e5;
            finalBettingAmount = totalBets - feeAmount;
            usdt.safeTransfer(admin, feeAmount);
        }
    }

    function claim() external declare notClaimed(msg.sender) returns (bool) {
        address _user = msg.sender;
        uint256 claimAmount = getUserClaimAmount(_user);
        userClaimed[_user] = true;
        if (claimAmount > 0) {
            emit Claim(_user, claimAmount);
            usdt.safeTransfer(_user, claimAmount);
        }
        return true;
    }

    function changeFee(uint256 _newfee)
        external
        onlyOwner
        notDeclare
        returns (bool)
    {
        fee = _newfee;
        return true;
    }

    function changeAdmin(address _admin) external onlyOwner returns (bool) {
        admin = _admin;
        return true;
    }

    function startBetting() external  onlyOwner {
        startbet = true;
    }

    function stopBetting() external  onlyOwner {
        startbet = false;
    }

    function getResultStatus() public view returns (string memory) {
        if (uint256(resultStatus) == 0) {
            return "Not Declared";
        } else if (uint256(resultStatus) == 1) {
            return "Winner A";
        } else if (uint256(resultStatus) == 2) {
            return "Winner B";
        } else if (uint256(resultStatus) == 3) {
            return "Cancel";
        } else {
            return "Draw";
        }
    }

    function getPotValue() public view returns (uint256) {
        uint256 totalBets = (totalBetsA + totalBetsB);
        return totalBets;
    }

    function getUserClaimAmount(address _user) public view returns (uint256) {
        ResultStatus resultstatus = resultStatus;
        uint256 amount = userBets[_user];
        uint8 choice = userChoice[_user];

        if (resultstatus == ResultStatus.NotDeclare) {
            return 0;
        } else if (resultstatus == ResultStatus.Cancel) {
            return amount;
        } else if (resultstatus == ResultStatus.Draw) {
            return ((amount * (1e5 - fee)) / 1e5);
        } else if (resultstatus == ResultStatus.WinnerA) {
            return
                (choice == 1)
                    ? (finalBettingAmount * amount) / (totalBetsA)
                    : 0;
        } else {
            return
                (choice == 2)
                    ? (finalBettingAmount * amount) / (totalBetsB)
                    : 0;
        }
    }

}