class VerificationHelper {
    private $conn;

    public function __construct($dbConnection) {
        $this->conn = $dbConnection;
    }

    public function generateKey($length) {
        $key = '';
        for ($i = 0; $i < $length; $i++) {
            $key .= random_int(0, 9);
        }
        return $key;
    }

    public function sendTextMobile($number, $message) {
        $payload = json_encode([
            'api_key' => 'hJ9tjUnczCU2AEtlRWZJxXdf81uqx39suWala1bVHMe8HwbMuiK0uLV5BmOMU5QG',
            'recipient_number' => '+88' . $number,
            'message' => $message,
            'mask_id' => 8809612441432
        ]);

        $ch = curl_init('https://my.text360.net/api/user/send/otp');
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => $payload,
            CURLOPT_HTTPHEADER => ['Content-Type: application/json']
        ]);
        $response = curl_exec($ch);
        curl_close($ch);

        return $response;
    }

    public function addNewToken($SopnoID, $ver_type, $ver_refer) {
        $token = $this->generateKey(7);
        $code = $this->generateKey(7);
        $sql = "INSERT INTO `gUser_vcode` (`ver_type`, `ver_refer`, `code`, `token`, `state`, `SopnoID`, `pay_state`, `receive_t`) 
                VALUES ('$ver_type', '$ver_refer', '$code', '$token', 0, '$SopnoID', 0, '')";

        return $this->conn->query($sql) ? $code : false;
    }

    public function sendWhatsAppGreeting($jsonData, $phoneNumber) {
        $data = json_decode($jsonData, true);
        $receiverN = ($data['phone_code'] === '+88' ? '88' : $data['phone_code']) . $data['mobile'];

        $message = [
            'templateName' => 'ghorami_verify',
            'receiverN' => $receiverN,
            'message_text' => '',
            'mtype' => '',
            'recipient_type' => '',
            'wr_type' => ''
        ];

        $postData = http_build_query([
            'message' => json_encode($message),
            'mobile' => $phoneNumber
        ]);

        $ch = curl_init('https://whatsapp.ghorami.com/api/wm_send.php');
        curl_setopt_array($ch, [
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => $postData,
            CURLOPT_RETURNTRANSFER => true
        ]);
        $result = curl_exec($ch);
        curl_close($ch);

        return $result ?: 'Warning';
    }

    public function sendVerificationEmail($jsonData, $email) {
        $data = json_decode($jsonData, true);
        $subject = $data['subject'];
        $from = 'verify@ghorami.com';

        $html = '
        <html><body style="font-family:Arial;">
            <center><img src="https://ghorami.com/profile/login/api_logged/ghorami_new_logo_24.png" width="200"/></center>
            <h2>' . htmlspecialchars($data['title']) . '</h2>
            <img src="' . htmlspecialchars($data['picture']) . '" width="100%" style="max-width:500px;" />
            <p><strong>' . nl2br(htmlspecialchars($data['message'])) . '</strong></p>
            <h3 style="color:red;">' . htmlspecialchars($data['info']) . '</h3>
            <p>Contact support at <a href="https://ghorami.com/contact">ghorami.com/contact</a></p>
        </body></html>';

        $headers = "MIME-Version: 1.0\r\n";
        $headers .= "Content-type:text/html;charset=UTF-8\r\n";
        $headers .= "From: $from";

        return mail($email, $subject, $html, $headers);
    }
}


/**


require_once 'dbconnect.php';
$helper = new VerificationHelper($conn);

// Generate token & send SMS
$token = $helper->addNewToken('SOP123', 'phone', 'registration');
$helper->sendTextMobile('01712345678', "Your verification code is $token");

// Send WhatsApp greeting
$helper->sendWhatsAppGreeting($json_payload, '01712345678');

// Send Email
$helper->sendVerificationEmail($json_payload, 'user@example.com');

**/