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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

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

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

$index = (int)$data['index'];
$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 {
    // Initialize cart if it doesn't exist
    if (!isset($_SESSION[$cartKey])) {
        $_SESSION[$cartKey] = [];
    }
    
    // Validate index
    if ($index < 0 || $index >= count($_SESSION[$cartKey])) {
        echo json_encode(['success' => false, 'error' => 'Invalid item index']);
        exit;
    }
    
    // Get the item
    $item = $_SESSION[$cartKey][$index];
    
    // Verify the item matches
    if ($type === 'track') {
        $itemId = $item['track_id'] ?? null;
        if ($itemId != $identifier) {
            echo json_encode(['success' => false, 'error' => 'Item identifier mismatch']);
            exit;
        }
    } elseif ($type === 'credit') {
        $itemPackage = $item['package'] ?? null;
        if ($itemPackage !== $identifier) {
            echo json_encode(['success' => false, 'error' => 'Item identifier mismatch']);
            exit;
        }
    }
    
    // Remove item if requested
    if ($remove) {
        array_splice($_SESSION[$cartKey], $index, 1);
        // Reindex array
        $_SESSION[$cartKey] = array_values($_SESSION[$cartKey]);
        echo json_encode(['success' => true, 'message' => 'Item removed']);
        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;
    }
    
    // Update the quantity
    $_SESSION[$cartKey][$index]['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()]);
}
?>