<?php
header('content-type: application/json');
$data = json_decode(file_get_contents('php://input'), true);
$receiver = $data['receiver'];
$appurl = $data['appurl'];
$text = $data['text'];
$keyword = strtolower($text);

// Error logging function for simplicity
function log_error($message) {
    error_log($message, 3, '/path/to/your/logfile.log'); // Ensure the log file path is correct and writable
}

// Log the incoming request for debugging
log_error("Incoming request: " . print_r($data, true));

// Check if the message matches the pattern for accepting or declining a booking
if (preg_match('/^(accept|decline)\s+(booking_\w+)$/', $keyword, $matches)) {
    $action = $matches[1];
    $booking_id = $matches[2];

    log_error("Processing $action for booking ID $booking_id");

    // Retrieve booking details from the WordPress API
    $booking_details = get_booking_details_from_api($booking_id);
    if ($booking_details) {
        // Send confirmation to customer
        send_confirmation_to_customer($booking_details, $action);

        // Respond back to the WhatsApp group
        $chat_message = "Booking ID $booking_id has been $action.";
        log_error("Sending response to group: $chat_message");
        $result = ['data' => ['text' => $chat_message]];
    } else {
        $error_message = "Booking ID $booking_id not found.";
        log_error($error_message);
        $result = ['data' => ['text' => $error_message]];
    }
} else {
    log_error("No matching keyword found for: $keyword");
}

if (!empty($result)) {
    echo json_encode($result);
}

function get_booking_details_from_api($booking_id) {
    $api_url = 'https://www.korsanevents.com/wp-json/korsan/v1/booking-details/' . $booking_id;

    $response = file_get_contents($api_url);
    if ($response === FALSE) {
        log_error("Failed to call API: $api_url");
        return null;
    }

    $booking_details = json_decode($response, true);
    if (isset($booking_details['code']) && $booking_details['code'] == 'no_booking') {
        log_error("No booking found for ID: $booking_id");
        return null;
    }

    log_error("Booking details retrieved: " . print_r($booking_details, true));
    return $booking_details;
}

function send_confirmation_to_customer($booking_details, $status) {
    $message_text = "Hi! Your booking with Korsan Restaurants has been $status. Here are your booking details:\n\n";
    $message_text .= "Restaurant: " . $booking_details['restaurant'] . "\n";
    $message_text .= "Date of Reservation: " . $booking_details['reservation_date'] . "\n";
    $message_text .= "Time of Reservation: " . $booking_details['reservation_time'] . "\n";
    $message_text .= "Booking Name: " . $booking_details['booking_name'] . "\n";
    $message_text .= "Persons: " . $booking_details['number_persons'] . "\n";
    $message_text .= "Contact Phone Number: " . $booking_details['phone_number'] . "\n";
    $message_text .= "Email: " . $booking_details['email'] . "\n\n";
    $message_text .= "We look forward to welcoming you at " . $booking_details['restaurant'] . "!";

    $nodeurl = 'https://api.kpnotify.com/send';
    $data_customer = [
        'receiver'  => normalize_phone_number($booking_details['phone_number']),
        'msgtext'   => $message_text,
        'token'     => 'your_api_token',  // Replace with your actual API token
    ];

    log_error("Sending confirmation to customer: " . print_r($data_customer, true));

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/x-www-form-urlencoded']);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data_customer));
    curl_setopt($ch, CURLOPT_URL, $nodeurl);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);

    $response_customer = curl_exec($ch);
    if ($response_customer === FALSE) {
        log_error("Failed to send message to customer: " . curl_error($ch));
    } else {
        log_error("Customer message response: " . $response_customer);
    }
    curl_close($ch);
}

function normalize_phone_number($phone_number) {
    // Remove all non-numeric characters except '+'
    $phone_number = preg_replace('/[^\d+]/', '', $phone_number);

    // If the phone number starts with '+', assume it's already in international format
    if (substr($phone_number, 0, 1) === '+') {
        return $phone_number;
    }

    // If the phone number starts with '00', replace it with '+'
    if (substr($phone_number, 0, 2) === '00') {
        return '+' . substr($phone_number, 2);
    }

    // If the phone number starts with '0', replace it with the default country code (e.g., '+44')
    if (substr($phone_number, 0, 1) === '0') {
        // You can change '+44' to your default country code if needed
        return '+44' . substr($phone_number, 1);
    }

    // Default case (assume international format without the '+')
    return '+' . $phone_number;
}
?>