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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
session_start();
header('Content-Type: application/json');

require_once '../config/database.php';
require_once '../includes/translations.php';

const MAX_TICKETS_PER_PURCHASE = 10;

// Check if it's a POST request
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['success' => false, 'error' => 'Invalid request method']);
    exit;
}

$data = json_decode(file_get_contents('php://input'), true);

if (!isset($data['type']) || !isset($data['identifier']) || !isset($data['cart_key'])) {
    echo json_encode(['success' => false, 'error' => 'Missing required parameters']);
    exit;
}

$type = $data['type'];
$identifier = $data['identifier'];
$cartKey = $data['cart_key'];
$change = isset($data['change']) ? (int)$data['change'] : 0;
$remove = isset($data['remove']) && $data['remove'] === true;

try {
    $pdo = getDBConnection();
    // Initialize cart if it doesn't exist
    if (!isset($_SESSION[$cartKey])) {
        $_SESSION[$cartKey] = [];
    }
    
    // Find the item by identifier instead of using index
    // This is more reliable since the merged cart index may not match the session array index
    $itemIndex = null;
    $item = null;
    
    foreach ($_SESSION[$cartKey] as $idx => $cartItem) {
        $matches = false;
        
        if ($type === 'track') {
            $itemId = $cartItem['track_id'] ?? null;
            if ($itemId == $identifier) {
                $matches = true;
            }
        } elseif ($type === 'credit') {
            $itemPackage = $cartItem['package'] ?? null;
            if ($itemPackage === $identifier) {
                $matches = true;
            }
        } elseif ($type === 'ticket') {
            $itemEventId = $cartItem['event_id'] ?? null;
            if ($itemEventId == $identifier) {
                $matches = true;
            }
        }
        
        if ($matches) {
            $itemIndex = $idx;
            $item = $cartItem;
            break;
        }
    }
    
    // If item not found, try to find by checking if it's a duplicate (same track/package/event)
    if ($itemIndex === null) {
        // For tracks, check if there's a duplicate with same track_id
        if ($type === 'track') {
            foreach ($_SESSION[$cartKey] as $idx => $cartItem) {
                if (isset($cartItem['track_id']) && $cartItem['track_id'] == $identifier) {
                    $itemIndex = $idx;
                    $item = $cartItem;
                    break;
                }
            }
        } elseif ($type === 'credit') {
            foreach ($_SESSION[$cartKey] as $idx => $cartItem) {
                if (isset($cartItem['package']) && $cartItem['package'] === $identifier) {
                    $itemIndex = $idx;
                    $item = $cartItem;
                    break;
                }
            }
        } elseif ($type === 'ticket') {
            foreach ($_SESSION[$cartKey] as $idx => $cartItem) {
                if (isset($cartItem['event_id']) && $cartItem['event_id'] == $identifier) {
                    $itemIndex = $idx;
                    $item = $cartItem;
                    break;
                }
            }
        }
    }
    
    if ($itemIndex === null || $item === null) {
        echo json_encode(['success' => false, 'error' => 'Item not found in cart']);
        exit;
    }
    
    // Remove item if requested
    if ($remove) {
        array_splice($_SESSION[$cartKey], $itemIndex, 1);
        // Reindex array
        $_SESSION[$cartKey] = array_values($_SESSION[$cartKey]);
        echo json_encode(['success' => true, 'message' => 'Item removed']);
        exit;
    }
    
    // Track purchases are limited to a single copy
    if ($type === 'track' && $change !== 0) {
        echo json_encode(['success' => false, 'error' => t('cart.single_quantity_error') ?? 'Tracks can only be purchased once.']);
        exit;
    }
    
    // Update quantity
    $currentQuantity = $item['quantity'] ?? 1;
    $newQuantity = $currentQuantity + $change;
    
    // Don't allow quantity below 1
    if ($newQuantity < 1) {
        echo json_encode(['success' => false, 'error' => 'Quantity cannot be less than 1. Use remove button to delete item.']);
        exit;
    }
    
    if ($type === 'ticket') {
        if ($newQuantity > MAX_TICKETS_PER_PURCHASE) {
            echo json_encode(['success' => false, 'error' => 'You can only purchase up to ' . MAX_TICKETS_PER_PURCHASE . ' tickets per event.']);
            exit;
        }
        
        $stmt = $pdo->prepare("
            SELECT 
                e.id,
                e.max_attendees,
                COUNT(DISTINCT et.id) as tickets_sold
            FROM events e
            LEFT JOIN event_tickets et ON e.id = et.event_id AND et.status IN ('pending', 'confirmed')
            WHERE e.id = ? AND e.status = 'published'
            GROUP BY e.id
        ");
        $stmt->execute([$identifier]);
        $event = $stmt->fetch(PDO::FETCH_ASSOC);
        
        if (!$event) {
            echo json_encode(['success' => false, 'error' => 'Event not available.']);
            exit;
        }
        
        if (!empty($event['max_attendees'])) {
            $remainingCapacity = max(0, $event['max_attendees'] - $event['tickets_sold']);
            if ($change > 0 && $remainingCapacity <= 0) {
                echo json_encode(['success' => false, 'error' => 'This event is sold out.']);
                exit;
            }
            
            if ($change > 0 && $change > $remainingCapacity) {
                echo json_encode(['success' => false, 'error' => "Only {$remainingCapacity} ticket(s) remain for this event."]);
                exit;
            }
        }
    }
    
    // Update the quantity
    $_SESSION[$cartKey][$itemIndex]['quantity'] = $newQuantity;
    
    echo json_encode([
        'success' => true,
        'message' => 'Quantity updated',
        'new_quantity' => $newQuantity
    ]);
    
} catch (Exception $e) {
    error_log('Error updating cart quantity: ' . $e->getMessage());
    echo json_encode(['success' => false, 'error' => 'Server error: ' . $e->getMessage()]);
}
?>