<?php
// Start the session
session_start();

require_once 'database/db_config.php';

// Check if user has faculty privileges
require_faculty_privileges('../login.php');

// Check for success or error messages
$success_message = '';
$error_message = '';

if (isset($_SESSION['success_message'])) {
    $success_message = $_SESSION['success_message'];
    unset($_SESSION['success_message']);
}

if (isset($_SESSION['error_message'])) {
    $error_message = $_SESSION['error_message'];
    unset($_SESSION['error_message']);
}

// Include header
include 'includes/header.php';
?>

    <!-- Course Filter Options -->
    <div class="card shadow mb-4">
        <div class="card-header py-3 d-flex flex-row align-items-center justify-content-between">
            <h6 class="m-0 font-weight-bold text-primary">Filter Courses</h6>
        </div>
        <div class="card-body">
            <form action="" method="GET" class="mb-3">
                <div class="row">
                    <div class="col-md-3 mb-3">
                        <select name="status" class="form-control">
                            <option value="all" <?php echo isset($_GET['status']) && $_GET['status'] == 'active' ? 'selected' : ''; ?>>Active</option>
                        </select>
                    </div>
                    <div class="col-md-3 mb-3">
                        <select name="category" class="form-control">
                            <option value="all">All Categories</option>
                            <?php
                            $cat_query = "SELECT * FROM categories ORDER BY name";
                            $cat_result = $conn->query($cat_query);
                            if ($cat_result && $cat_result->num_rows > 0) {
                                while ($cat = $cat_result->fetch_assoc()) {
                                    $selected = (isset($_GET['category']) && $_GET['category'] == $cat['id']) ? 'selected' : '';
                                    echo '<option value="' . $cat['id'] . '" ' . $selected . '>' . htmlspecialchars($cat['name']) . '</option>';
                                }
                            }
                            ?>
                        </select>
                    </div>
                    <div class="col-md-4 mb-3">
                        <input type="text" name="search" class="form-control" placeholder="Search by title..." 
                        value="<?php echo isset($_GET['search']) ? htmlspecialchars($_GET['search']) : ''; ?>">
                    </div>
                    <div class="col-md-2 mb-3">
                        <button type="submit" class="btn btn-primary btn-block">Filter</button>
                    </div>
                </div>
            </form>
        </div>
    </div>

    <!-- Course List -->
    <div class="card shadow mb-4">
        <div class="card-header py-3">
            <h6 class="m-0 font-weight-bold text-primary">All Courses</h6>
        </div>
        <div class="card-body">
            <div class="table-responsive">
                <table class="table table-bordered" id="coursesTable" width="100%" cellspacing="0">
                    <thead>
                        <tr>
                            <th>Title</th>
                            <th>Category</th>
                            <th>Price</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php
                        // Build the query based on filters
                        $sql = "SELECT c.*, cat.name as category_name 
                                FROM courses c
                                LEFT JOIN categories cat ON c.category = cat.id
                                WHERE 1=1";
                        
                      
                        
                        // Category filter
                        if (isset($_GET['category']) && $_GET['category'] != 'all') {
                            $category = $conn->real_escape_string($_GET['category']);
                            $sql .= " AND c.category = '$category'";
                        }
                        
                        
                        
                        // Search filter
                        if (isset($_GET['search']) && !empty($_GET['search'])) {
                            $search = $conn->real_escape_string($_GET['search']);
                            $sql .= " AND (c.title LIKE '%$search%' OR c.short_description LIKE '%$search%')";
                        }
                        
                        $sql .= " ORDER BY c.id DESC";
                        
                        $result = $conn->query($sql);
                        
                        if ($result && $result->num_rows > 0) {
                            while ($row = $result->fetch_assoc()) {
                        ?>
                        <tr>
                            <td>
                                <img src="<?php echo !empty($row['image']) ? '../' . $row['image'] : '../assets/img/defaults/default-course-image.jpg'; ?>" 
                                    alt="<?php echo htmlspecialchars($row['title']); ?>" class="img-thumbnail mr-2" style="width: 80px; height: 50px; object-fit: cover;">
                                <?php echo htmlspecialchars($row['title']); ?>
                            </td>
                            <td><?php echo htmlspecialchars($row['category_name'] ?? 'Uncategorized'); ?></td>
                            <td>
                                <?php 
                                if ($row['price'] > 0) {
                                    echo "₹" . number_format($row['price'], 2);
                                    if (!empty($row['discount_price']) && $row['discount_price'] > 0 && $row['discount_price'] < $row['price']) {
                                        echo " <span class='text-danger'><del>₹" . number_format($row['discount_price'], 2) . "</del></span>";
                                    }
                                } else {
                                    echo '<span class="badge badge-success">Free</span>';
                                }
                                ?>
                            </td>
                           
                        </tr>
                        <?php
                    }
                } else {
                    ?>
                    <tr>
                    <td colspan="7" class="text-center">No courses found</td>
                    </tr>
                    <?php
                }
                ?>
            </tbody>
        </table>
    </div>
</div>
</div>
<!-- /.container-fluid -->


<?php
// Include footer
include 'includes/footer.php';
?>