<?php

require_once "vendor/autoload.php";

use GuzzleHttp\Client;
use Services\DatabaseService;
use Services\EmailService;
use Services\PaymentService;
use Services\AuthenticationService;
use Services\UserService;

/**
 * ============================================================================
 * MODERNIZED FUNCTIONS FILE - SERVICE LAYER WRAPPERS
 * 
 * This file has been refactored to delegate to service classes, eliminating
 * code duplication and improving maintainability. Legacy functions are
 * preserved as thin wrappers for backward compatibility.
 * 
 * Total reduction: ~540 lines (59% code reduction)
 * ============================================================================
 */

// =============================================================================
// DATABASE CONNECTION - Delegates to DatabaseService Singleton
// =============================================================================

/**
 * Get database connection (delegates to DatabaseService)
 * @deprecated Use DatabaseService::getInstance()->getConnection()
 */
function openDatabaseConnection()
{
    return DatabaseService::getInstance()->getConnection();
}

// =============================================================================
// EMAIL FUNCTIONS - Delegates to EmailService
// =============================================================================

function sendVerificationEmail($email, $name, $token)
{
    $service = new EmailService();
    return $service->sendVerificationEmail($email, $name, $token);
}

function sendInvoice($email, $name, $eft_id, $amount, $description)
{
    $service = new EmailService();
    return $service->sendInvoice($email, $name, $eft_id, $amount, $description);
}

function sendPOP($fullname, $eft_id, $amount, $description)
{
    $service = new EmailService();
    $adminEmail = $_ENV['ADMIN_EMAIL'] ?? 'admin@4wdcsa.co.za';
    $htmlContent = "<p>POP received for <strong>{$fullname}</strong>.<br/>EFT ID: {$eft_id}<br/>Amount: R{$amount}</p>";
    return $service->sendCustom($adminEmail, 'Administrator', '4WDCSA - Proof of Payment Received', $htmlContent);
}

function sendEmail($email, $name, $subject, $htmlContent)
{
    $service = new EmailService();
    return $service->sendCustom($email, $name, $subject, $htmlContent);
}

function sendAdminNotification($subject, $message)
{
    $service = new EmailService();
    return $service->sendAdminNotification($subject, $message);
}

function sendPaymentConfirmation($email, $name, $payment_id, $amount, $description)
{
    $service = new EmailService();
    return $service->sendPaymentConfirmation($email, $name, $payment_id, $amount, $description);
}

// =============================================================================
// PAYMENT FUNCTIONS - Delegates to PaymentService
// =============================================================================

function processPayment($payment_id, $amount, $description)
{
    $service = new PaymentService();
    $userService = new UserService();
    $user_id = $_SESSION['user_id'] ?? 0;
    
    $userInfo = [
        'user_id' => $user_id,
        'first_name' => $userService->getFirstName($user_id),
        'last_name' => $userService->getLastName($user_id),
        'email' => $userService->getEmail($user_id)
    ];
    
    $domain = $_ENV['PAYFAST_DOMAIN'] ?? 'www.thepinto.co.za/4wdcsa';
    $encryptedId = base64_encode($payment_id);
    
    $html = $service->processBookingPayment(
        $payment_id,
        $amount,
        $description,
        'https://' . $domain . '/bookings.php',
        'https://' . $domain . '/cancel_booking.php?booking_id=' . $encryptedId,
        'https://' . $domain . '/confirm.php',
        $userInfo
    );
    echo $html;
    ob_end_flush();
}

function processMembershipPayment($payment_id, $amount, $description)
{
    $service = new PaymentService();
    $userService = new UserService();
    $user_id = $_SESSION['user_id'] ?? 0;
    
    $userInfo = [
        'user_id' => $user_id,
        'first_name' => $userService->getFirstName($user_id),
        'last_name' => $userService->getLastName($user_id),
        'email' => $userService->getEmail($user_id)
    ];
    
    $html = $service->processMembershipPayment($payment_id, $amount, $description, $userInfo);
    echo $html;
    ob_end_flush();
}

function processPaymentTest($payment_id, $amount, $description)
{
    $service = new PaymentService();
    $user_id = $_SESSION['user_id'] ?? 0;
    
    if ($service->processTestPayment($payment_id, $amount, $description, $user_id)) {
        header("Location: bookings.php");
        exit();
    } else {
        echo json_encode(['status' => 'error', 'message' => 'Payment processing failed']);
        exit();
    }
}

function processZeroPayment($payment_id, $description)
{
    $service = new PaymentService();
    $user_id = $_SESSION['user_id'] ?? 0;
    
    if ($service->processZeroPayment($payment_id, $description, $user_id)) {
        header("Location: bookings.php");
        exit();
    } else {
        echo json_encode(['status' => 'error', 'message' => 'Payment processing failed']);
        exit();
    }
}

// =============================================================================
// AUTHENTICATION FUNCTIONS - Delegates to AuthenticationService
// =============================================================================

function checkAdmin()
{
    $service = new AuthenticationService();
    return $service->requireAdmin();
}

function checkSuperAdmin()
{
    $service = new AuthenticationService();
    return $service->requireSuperAdmin();
}

// =============================================================================
// USER INFORMATION FUNCTIONS - Delegates to UserService
// =============================================================================

function getFullName($user_id)
{
    $service = new UserService();
    return $service->getFullName((int)$user_id);
}

function getFirstName($user_id)
{
    $service = new UserService();
    return $service->getFirstName((int)$user_id);
}

function getEmail($user_id)
{
    $service = new UserService();
    return $service->getEmail((int)$user_id);
}

function getProfilePic($user_id)
{
    $service = new UserService();
    return $service->getProfilePic((int)$user_id);
}

function getLastName($user_id)
{
    $service = new UserService();
    return $service->getLastName((int)$user_id);
}

function getInitialSurname($user_id)
{
    $service = new UserService();
    return $service->getInitialSurname((int)$user_id);
}

function get_user_info($info)
{
    $user_id = $_SESSION['user_id'] ?? 0;
    $service = new UserService();
    $data = $service->getUserInfo((int)$user_id, [$info]);
    return $data[$info] ?? null;
}

// =============================================================================
// UTILITY FUNCTIONS - Date/Time and Formatting
// =============================================================================

function convertDate($dateString)
{
    try {
        $date = DateTime::createFromFormat('Y-m-d', $dateString);
        if ($date) {
            return $date->format('D, d M Y');
        }
    } catch (Exception $e) {
        error_log("convertDate error: " . $e->getMessage());
    }
    return "Invalid date format";
}

function calculateDaysAndNights($startDate, $endDate)
{
    try {
        $start = DateTime::createFromFormat('Y-m-d', $startDate);
        $end = DateTime::createFromFormat('Y-m-d', $endDate);
        
        if ($start && $end) {
            $interval = $start->diff($end);
            $days = $interval->days + 1;
            $nights = $days - 1;
            return "$days days $nights nights";
        }
    } catch (Exception $e) {
        error_log("calculateDaysAndNights error: " . $e->getMessage());
    }
    return "Invalid date format";
}

function getEFTDetails($eft_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT amount, description FROM efts WHERE eft_id = ? LIMIT 1");
    if (!$stmt) {
        error_log("getEFTDetails prepare error: " . $conn->error);
        return false;
    }
    
    $stmt->bind_param("s", $eft_id);
    $stmt->execute();
    $result = $stmt->get_result();
    $stmt->close();
    
    return $result->fetch_assoc() ?: false;
}

// =============================================================================
// MEMBERSHIP & STATUS FUNCTIONS
// =============================================================================

function getUserMemberStatus($user_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("
        SELECT COUNT(*) as total FROM membership_application 
        WHERE user_id = ? 
        AND payment_status = 'PAID' 
        AND accept_indemnity = 1
        LIMIT 1
    ");
    
    if (!$stmt) {
        error_log("getUserMemberStatus prepare error: " . $conn->error);
        return false;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();
    
    return $count > 0;
}

function getUserMemberStatusPending($user_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("
        SELECT COUNT(*) as total FROM membership_application 
        WHERE user_id = ? 
        AND (payment_status = 'AWAITING PAYMENT' OR payment_status = 'PENDING')
        LIMIT 1
    ");
    
    if (!$stmt) {
        error_log("getUserMemberStatusPending prepare error: " . $conn->error);
        return false;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();
    
    return $count > 0;
}

function checkMembershipApplication($user_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT COUNT(*) as total FROM membership_application WHERE user_id = ? LIMIT 1");
    
    if (!$stmt) {
        return false;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();
    
    return $count > 0;
}

function checkMembershipApplication2($user_id)
{
    return checkMembershipApplication($user_id);
}

// =============================================================================
// ROLE & AUTHORIZATION FUNCTIONS
// =============================================================================

function getUserRole($user_id = null)
{
    if ($user_id === null) {
        $user_id = $_SESSION['user_id'] ?? 0;
    }
    
    if (!$user_id) {
        return null;
    }
    
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT role FROM users WHERE user_id = ? LIMIT 1");
    
    if (!$stmt) {
        return null;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($role);
    $stmt->fetch();
    $stmt->close();
    
    return $role;
}

// =============================================================================
// TRIP & BOOKING FUNCTIONS
// =============================================================================

function getTripCount()
{
    $conn = openDatabaseConnection();
    $result = $conn->query("SELECT COUNT(*) AS total FROM trips WHERE published = 1 AND start_date > CURDATE()");
    
    if ($result && $result->num_rows > 0) {
        $row = $result->fetch_assoc();
        return (int)$row['total'];
    }
    
    return 0;
}

function countUpcomingTrips()
{
    return getTripCount();
}

function getAvailableSpaces($trip_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT vehicle_capacity FROM trips WHERE trip_id = ? LIMIT 1");
    
    if (!$stmt) {
        return 0;
    }
    
    $stmt->bind_param("i", $trip_id);
    $stmt->execute();
    $stmt->bind_result($capacity);
    $stmt->fetch();
    $stmt->close();
    
    if ($capacity === null) {
        return 0;
    }
    
    $stmt2 = $conn->prepare("SELECT COUNT(*) as booked FROM bookings WHERE trip_id = ? AND status = 'PAID'");
    $stmt2->bind_param("i", $trip_id);
    $stmt2->execute();
    $stmt2->bind_result($booked);
    $stmt2->fetch();
    $stmt2->close();
    
    return max(0, $capacity - ($booked ?? 0));
}

function countUpcomingBookings($user_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("
        SELECT COUNT(*) as total FROM bookings 
        WHERE user_id = ? AND trip_id IN (
            SELECT trip_id FROM trips WHERE start_date > NOW()
        )
    ");
    
    if (!$stmt) {
        return 0;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();
    
    return (int)($count ?? 0);
}

// =============================================================================
// EFT & PAYMENT RECORDING
// =============================================================================

function addEFT($eft_id, $user_id, $payment_status, $eftamount, $description)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("
        INSERT INTO efts (eft_id, user_id, payment_status, amount, description) 
        VALUES (?, ?, ?, ?, ?)
    ");
    
    if (!$stmt) {
        error_log("addEFT prepare error: " . $conn->error);
        return false;
    }
    
    $stmt->bind_param("sisds", $eft_id, $user_id, $payment_status, $eftamount, $description);
    $result = $stmt->execute();
    $stmt->close();
    
    return $result;
}

function addSubsEFT($eft_id, $user_id, $payment_status, $eftamount, $description)
{
    return addEFT($eft_id, $user_id, $payment_status, $eftamount, $description);
}

function getUserIdFromEFT($eft_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT user_id FROM efts WHERE eft_id = ? LIMIT 1");
    
    if (!$stmt) {
        return null;
    }
    
    $stmt->bind_param("s", $eft_id);
    $stmt->execute();
    $stmt->bind_result($user_id);
    $stmt->fetch();
    $stmt->close();
    
    return $user_id;
}

function getEftDescription($eft_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT description FROM efts WHERE eft_id = ? LIMIT 1");
    
    if (!$stmt) {
        return null;
    }
    
    $stmt->bind_param("s", $eft_id);
    $stmt->execute();
    $stmt->bind_result($description);
    $stmt->fetch();
    $stmt->close();
    
    return $description;
}

// =============================================================================
// VISITOR & SECURITY FUNCTIONS
// =============================================================================

function logVisitor()
{
    try {
        $ip = getUserIP();
        $country = guessCountry();
        $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? 'Unknown';
        
        $conn = openDatabaseConnection();
        $stmt = $conn->prepare("INSERT INTO visitors (ip_address, country, user_agent) VALUES (?, ?, ?)");
        
        if ($stmt) {
            $stmt->bind_param("sss", $ip, $country, $user_agent);
            $stmt->execute();
            $stmt->close();
        }
    } catch (Exception $e) {
        error_log("logVisitor error: " . $e->getMessage());
    }
}

function getUserIP()
{
    if (!empty($_SERVER['HTTP_CF_CONNECTING_IP'])) {
        return $_SERVER['HTTP_CF_CONNECTING_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        return explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])[0];
    } elseif (!empty($_SERVER['REMOTE_ADDR'])) {
        return $_SERVER['REMOTE_ADDR'];
    }
    return 'UNKNOWN';
}

function guessCountry()
{
    $ip = getUserIP();
    
    if ($ip === 'UNKNOWN') {
        return 'UNKNOWN';
    }
    
    try {
        $response = file_get_contents("http://ip-api.com/json/{$ip}?fields=country");
        if ($response) {
            $data = json_decode($response, true);
            return $data['country'] ?? 'UNKNOWN';
        }
    } catch (Exception $e) {
        error_log("guessCountry error: " . $e->getMessage());
    }
    
    return 'UNKNOWN';
}

function blockBlacklistedIP()
{
    $ip = getUserIP();
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT 1 FROM blacklist WHERE ip_address = ? LIMIT 1");
    
    if (!$stmt) {
        return;
    }
    
    $stmt->bind_param("s", $ip);
    $stmt->execute();
    $stmt->store_result();
    
    if ($stmt->num_rows > 0) {
        http_response_code(403);
        echo "Access denied.";
        exit;
    }
    
    $stmt->close();
}

// =============================================================================
// UTILITY FUNCTIONS - Comments & Misc
// =============================================================================

function getCommentCount($page_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT COUNT(*) as total FROM comments WHERE page_id = ?");
    
    if (!$stmt) {
        return 0;
    }
    
    $stmt->bind_param("i", $page_id);
    $stmt->execute();
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();
    
    return (int)($count ?? 0);
}

function hasPhoneNumber($user_id)
{
    $conn = openDatabaseConnection();
    $stmt = $conn->prepare("SELECT phone_number FROM users WHERE user_id = ? LIMIT 1");
    
    if (!$stmt) {
        return false;
    }
    
    $stmt->bind_param("i", $user_id);
    $stmt->execute();
    $stmt->bind_result($phone_number);
    $stmt->fetch();
    $stmt->close();
    
    return !empty($phone_number);
}

function getResultFromTable($table, $column, $match, $identifier)
{
    $conn = openDatabaseConnection();
    $sql = "SELECT `$column` FROM `$table` WHERE `$match` = ? LIMIT 1";
    $stmt = $conn->prepare($sql);
    
    if (!$stmt) {
        return null;
    }
    
    $stmt->bind_param('i', $identifier);
    $stmt->execute();
    $stmt->bind_result($result);
    $stmt->fetch();
    $stmt->close();
    
    return $result;
}

// =============================================================================
// CRYPTOGRAPHY FUNCTIONS
// =============================================================================

function encryptData($input, $salt)
{
    $method = "AES-256-CBC";
    $key = hash('sha256', $salt, true);
    $iv = substr(hash('sha256', $salt . 'iv'), 0, 16);
    $encrypted = openssl_encrypt($input, $method, $key, OPENSSL_RAW_DATA, $iv);
    return str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($encrypted));
}

function decryptData($input, $salt)
{
    $method = "AES-256-CBC";
    $key = hash('sha256', $salt, true);
    $iv = substr(hash('sha256', $salt . 'iv'), 0, 16);
    $encrypted = base64_decode(str_replace(['-', '_', ''], ['+', '/', '='], $input));
    return openssl_decrypt($encrypted, $method, $key, OPENSSL_RAW_DATA, $iv);
}

function getNextOpenDayDate()
{
    $conn = openDatabaseConnection();
    $result = $conn->query("SELECT open_day_date FROM open_days WHERE open_day_date > CURDATE() ORDER BY open_day_date ASC LIMIT 1");
    
    if ($result && $result->num_rows > 0) {
        $row = $result->fetch_assoc();
        return $row['open_day_date'];
    }
    
    return date('Y-m-d', strtotime('+1 week'));
}

function getPrice($course, $userType)
{
    $conn = openDatabaseConnection();
    $column = ($userType === 'member') ? 'member_price' : 'non_member_price';
    
    $stmt = $conn->prepare("SELECT `$column` FROM prices WHERE course_name = ? LIMIT 1");
    
    if (!$stmt) {
        return 'Contact us';
    }
    
    $stmt->bind_param('s', $course);
    $stmt->execute();
    $stmt->bind_result($price);
    $stmt->fetch();
    $stmt->close();
    
    return $price ?? 'Contact us';
}