<?php
session_start();

require_once 'db/config.php'; // Include the database configuration

// Handle CSV download
if (isset($_GET['download_csv'])) {
    $user_id = $_SESSION['user_id'];
    $pdo = db();

    $query = "SELECT name, description, price, location, status, creation_date FROM items WHERE owner_id = ?";
    $query_params = [$user_id];

    if (isset($_GET['search']) && !empty($_GET['search'])) {
        $searchTerm = '%' . $_GET['search'] . '%';
        $query .= " AND (name LIKE ? OR description LIKE ?)";
        $query_params[] = $searchTerm;
        $query_params[] = $searchTerm;
    }

    if (isset($_GET['status']) && !empty($_GET['status'])) {
        $statusFilter = $_GET['status'];
        $query .= " AND status = ?";
        $query_params[] = $statusFilter;
    }

    $orderBy = " ORDER BY creation_date DESC"; // Default sort

    if (isset($_GET['sort']) && !empty($_GET['sort'])) {
        switch ($_GET['sort']) {
            case 'name_asc':
                $orderBy = " ORDER BY name ASC";
                break;
            case 'name_desc':
                $orderBy = " ORDER BY name DESC";
                break;
            case 'price_asc':
                $orderBy = " ORDER BY price ASC";
                break;
            case 'price_desc':
                $orderBy = " ORDER BY price DESC";
                break;
            case 'date_asc':
                $orderBy = " ORDER BY creation_date ASC";
                break;
            case 'date_desc':
                $orderBy = " ORDER BY creation_date DESC";
                break;
        }
    }
    $query .= $orderBy;

    $stmt = $pdo->prepare($query);
    $stmt->execute($query_params);
    $items_to_export = $stmt->fetchAll(PDO::FETCH_ASSOC);

    header('Content-Type: text/csv');
    header('Content-Disposition: attachment; filename="my_listings.csv"');

    $output = fopen('php://output', 'w');
    if (!empty($items_to_export)) {
        fputcsv($output, array_keys($items_to_export[0])); // CSV Header
        foreach ($items_to_export as $row) {
            fputcsv($output, $row);
        }
    }
    fclose($output);
    exit();
}

// Pagination constants
    $items_per_page = isset($_GET['items_per_page']) ? (int)$_GET['items_per_page'] : 6;
    // Validate $items_per_page to be a positive integer, e.g., 6, 12, 24, 48
    if (!in_array($items_per_page, [6, 12, 24, 48])) {
        $items_per_page = 6; // Default to 6 if invalid value is provided
    }

    // Pagination constants
    // const ITEMS_PER_PAGE = 6;

// If user is not logged in or not a vendor, redirect
if (!isset($_SESSION['user_id']) || $_SESSION['user_role'] !== 'vendor') {
    header("Location: login.php"); // Redirect to login or a suitable page
    exit;
}

$user_id = $_SESSION['user_id'];
$user_name = $_SESSION['user_name'];

$pdo = db(); // Get the PDO connection

$items = []; // Initialize an empty array to hold items

// Fetch items listed by the current vendor
    $total_items_query = "SELECT COUNT(*) FROM items WHERE owner_id = ?";
    $total_items_params = [$user_id];

    if (isset($_GET['search']) && !empty($_GET['search'])) {
        $searchTerm = '%' . $_GET['search'] . '%';
        $total_items_query .= " AND (name LIKE ? OR description LIKE ?)";
        $total_items_params[] = $searchTerm;
        $total_items_params[] = $searchTerm;
    }

    if (isset($_GET['status']) && !empty($_GET['status'])) {
        $statusFilter = $_GET['status'];
        $total_items_query .= " AND status = ?";
        $total_items_params[] = $statusFilter;
    }

    $total_stmt = $pdo->prepare($total_items_query);
    $total_stmt->execute($total_items_params);
    $total_items = $total_stmt->fetchColumn();

    $total_pages = ceil($total_items / $items_per_page);

    $current_page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
    $current_page = max(1, min($current_page, $total_pages == 0 ? 1 : $total_pages)); // Ensure current page is within valid range
    $offset = ($current_page - 1) * ITEMS_PER_PAGE;

    // Fetch items listed by the current vendor
    $query = "SELECT * FROM items WHERE owner_id = ?";
    $query_params = [$user_id];

    if (isset($_GET['search']) && !empty($_GET['search'])) {
        $searchTerm = '%' . $_GET['search'] . '%';
        $query .= " AND (name LIKE ? OR description LIKE ?)";
        $query_params[] = $searchTerm;
        $query_params[] = $searchTerm;
    }

    if (isset($_GET['status']) && !empty($_GET['status'])) {
        $statusFilter = $_GET['status'];
        $query .= " AND status = ?";
        $query_params[] = $statusFilter;
    }

    $orderBy = " ORDER BY creation_date DESC"; // Default sort

    if (isset($_GET['sort']) && !empty($_GET['sort'])) {
        switch ($_GET['sort']) {
            case 'name_asc':
                $orderBy = " ORDER BY name ASC";
                break;
            case 'name_desc':
                $orderBy = " ORDER BY name DESC";
                break;
            case 'price_asc':
                $orderBy = " ORDER BY price ASC";
                break;
            case 'price_desc':
                $orderBy = " ORDER BY price DESC";
                break;
            case 'date_asc':
                $orderBy = " ORDER BY creation_date ASC";
                break;
            case 'date_desc':
                $orderBy = " ORDER BY creation_date DESC";
                break;
        }
    }

    $query .= $orderBy;
    $query .= " LIMIT ? OFFSET ?";
    $query_params[] = $items_per_page;
    $query_params[] = $offset;

    $stmt = $pdo->prepare($query);
    $stmt->execute($query_params);
    $items = $stmt->fetchAll();
?>
<?php include 'header.php'; ?>

<div class="container mt-5">
    <div class="row">
        <div class="col-md-12">
            <div class="card">
                <div class="card-header">
                    <h4><?php echo htmlspecialchars($user_name); ?>'s Listings</h4>
                </div>
                <div class="card-body">
                    <?php if (isset($_SESSION['success_message'])): ?>
                        <div class="alert alert-success">
                            <?php echo htmlspecialchars($_SESSION['success_message']); unset($_SESSION['success_message']); ?>
                        </div>
                    <?php endif; ?>
                    <?php if (isset($_SESSION['error_message'])): ?>
                        <div class="alert alert-danger">
                            <?php echo htmlspecialchars($_SESSION['error_message']); unset($_SESSION['error_message']); ?>
                        </div>
                    <?php endif; ?>
                    <p>Manage your listed items here.</p>

                    <form action="my_listings.php" method="get" class="mb-4">
                        <div class="input-group">
                            <input type="text" class="form-control" placeholder="Search your listings..." name="search" value="<?php echo htmlspecialchars($_GET['search'] ?? ''); ?>">
                            <select class="form-select" name="status">
                                <option value="">All Statuses</option>
                                <option value="available" <?php echo (isset($_GET['status']) && $_GET['status'] === 'available') ? 'selected' : ''; ?>>Available</option>
                                <option value="rented" <?php echo (isset($_GET['status']) && $_GET['status'] === 'rented') ? 'selected' : ''; ?>>Rented</option>
                                <option value="unavailable" <?php echo (isset($_GET['status']) && $_GET['status'] === 'unavailable') ? 'selected' : ''; ?>>Unavailable</option>
                            </select>
                            <select class="form-select" name="sort">
                                <option value="" <?php echo (!isset($_GET['sort']) || $_GET['sort'] === '') ? 'selected' : ''; ?>>Sort By</option>
                                <option value="name_asc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'name_asc') ? 'selected' : ''; ?>>Name (A-Z)</option>
                                <option value="name_desc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'name_desc') ? 'selected' : ''; ?>>Name (Z-A)</option>
                                <option value="price_asc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'price_asc') ? 'selected' : ''; ?>>Price (Low to High)</option>
                                <option value="price_desc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'price_desc') ? 'selected' : ''; ?>>Price (High to Low)</option>
                                <option value="date_desc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'date_desc') ? 'selected' : ''; ?>>Date Added (Newest)</option>
                                <option value="date_asc" <?php echo (isset($_GET['sort']) && $_GET['sort'] === 'date_asc') ? 'selected' : ''; ?>>Date Added (Oldest)</option>
                            </select>
                            <select class="form-select" name="items_per_page">
                                <option value="6" <?php echo ((isset($_GET['items_per_page']) && $_GET['items_per_page'] == 6) || !isset($_GET['items_per_page'])) ? 'selected' : ''; ?>>6 per page</option>
                                <option value="12" <?php echo (isset($_GET['items_per_page']) && $_GET['items_per_page'] == 12) ? 'selected' : ''; ?>>12 per page</option>
                                <option value="24" <?php echo (isset($_GET['items_per_page']) && $_GET['items_per_page'] == 24) ? 'selected' : ''; ?>>24 per page</option>
                                <option value="48" <?php echo (isset($_GET['items_per_page']) && $_GET['items_per_page'] == 48) ? 'selected' : ''; ?>>48 per page</option>
                            </select>
                            <button class="btn btn-outline-secondary" type="submit">Filter</button>
                            <a href="my_listings.php" class="btn btn-outline-danger">Clear Filters</a>
                            <button class="btn btn-outline-success" type="submit" name="download_csv">Download CSV</button>
                        </div>
                    </form>
                    <?php
                    $activeFilters = [];
                    if (!empty($_GET['search'])) {
                        $activeFilters[] = 'Search: <strong>' . htmlspecialchars($_GET['search']) . '</strong>';
                    }
                    if (!empty($_GET['status'])) {
                        $statusText = [
                            'available' => 'Available',
                            'rented' => 'Rented',
                            'unavailable' => 'Unavailable'
                        ][$_GET['status']] ?? ucfirst($_GET['status']);
                        $activeFilters[] = 'Status: <strong>' . htmlspecialchars($statusText) . '</strong>';
                    }
                    if (!empty($_GET['sort'])) {
                        $sortText = [
                            'name_asc' => 'Name (A-Z)',
                            'name_desc' => 'Name (Z-A)',
                            'price_asc' => 'Price (Low to High)',
                            'price_desc' => 'Price (High to Low)',
                            'date_desc' => 'Date Added (Newest)',
                            'date_asc' => 'Date Added (Oldest)'
                        ][$_GET['sort']] ?? '';
                        if (!empty($sortText)) {
                            $activeFilters[] = 'Sort By: <strong>' . htmlspecialchars($sortText) . '</strong>';
                        }
                    }
                    if (!empty($_GET['items_per_page']) && (int)$_GET['items_per_page'] !== 6) { // Assume 6 is default
                        $activeFilters[] = 'Items per page: <strong>' . htmlspecialchars($_GET['items_per_page']) . '</strong>';
                    }

                    if (!empty($activeFilters)):
                    ?>
                        <div class="alert alert-info mb-4" role="alert">
                            <strong>Active Filters:</strong> <?php echo implode(' | ', $activeFilters); ?>
                        </div>
                    <?php endif; ?>

                    <?php if (empty($items)): ?>
                        <p>You have not listed any items yet. <a href="add_item.php">Add a new item</a>.</p>
                    <?php else: ?>
                        <div class="row">
                            <?php foreach ($items as $item): ?>
                                <div class="col-md-4 mb-4">
                                    <div class="card h-100">
                                        <img src="<?php echo htmlspecialchars($item['image_url'] ?? 'https://via.placeholder.com/150'); ?>" class="card-img-top" alt="<?php echo htmlspecialchars($item['name']); ?>">
                                        <div class="card-body d-flex flex-column">
                                            <h5 class="card-title"><?php echo htmlspecialchars($item['name']); ?></h5>
                                            <p class="card-text flex-grow-1"><?php echo htmlspecialchars($item['description']); ?></p>
                                            <p class="card-text"><strong>Price:</strong> $<?php echo htmlspecialchars(number_format($item['price'], 2)); ?> per day</p>
                                            <p class="card-text"><strong>Location:</strong> <?php echo htmlspecialchars($item['location']); ?></p>
                                            <div class="mt-auto">
                                                <a href="item_details.php?id=<?php echo htmlspecialchars($item['id']); ?>" class="btn btn-info btn-sm">View</a>
                                                <a href="edit_item.php?id=<?php echo htmlspecialchars($item['id']); ?>" class="btn btn-warning btn-sm">Edit</a>
                                                <a href="delete_item.php?id=<?php echo htmlspecialchars($item['id']); ?>" class="btn btn-danger btn-sm">Delete</a>
                                                <p class="text-info mt-2">Status: <?php echo htmlspecialchars(ucfirst($item['status'])); ?></p>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            <?php endforeach; ?>
                        </div>

                        <?php if ($total_pages > 1): ?>
                            <nav aria-label="Page navigation">
                                <ul class="pagination justify-content-center">
                                    <li class="page-item <?php echo ($current_page <= 1) ? 'disabled' : ''; ?>">
                                        <a class="page-link" href="?<?php echo http_build_query(array_merge($_GET, ['page' => $current_page - 1])); ?>" tabindex="-1" aria-disabled="true">Previous</a>
                                    </li>
                                    <?php for ($i = 1; $i <= $total_pages; $i++): ?>
                                        <li class="page-item <?php echo ($current_page == $i) ? 'active' : ''; ?>"><a class="page-link" href="?<?php echo http_build_query(array_merge($_GET, ['page' => $i])); ?>"><?php echo $i; ?></a></li>
                                    <?php endfor; ?>
                                    <li class="page-item <?php echo ($current_page >= $total_pages) ? 'disabled' : ''; ?>">
                                        <a class="page-link" href="?<?php echo http_build_query(array_merge($_GET, ['page' => $current_page + 1])); ?>">Next</a>
                                    </li>
                                </ul>
                            </nav>
                        <?php endif; ?>

                    <?php endif; ?>
                </div>
            </div>
        </div>
    </div>
</div>

<?php include 'footer.php'; ?>