<?php
session_start();
require_once 'db/config.php';

// --- DATABASE SETUP ---
function setup_database() {
    try {
        $pdo = db();
        $pdo->exec("CREATE TABLE IF NOT EXISTS puzzles (
            id INT AUTO_INCREMENT PRIMARY KEY,
            name VARCHAR(255) DEFAULT 'Senza Nome',
            file_name VARCHAR(255) NOT NULL UNIQUE,
            is_public BOOLEAN DEFAULT FALSE,
            is_admin_upload BOOLEAN DEFAULT FALSE,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )");
        // Attempt to add 'name' column, ignore error if it already exists
        try {
            $pdo->exec("ALTER TABLE puzzles ADD COLUMN name VARCHAR(255) DEFAULT 'Senza Nome'");
        } catch (PDOException $e) {
            // Ignore error, likely "Duplicate column name"
        }
    } catch (PDOException $e) {
        // In a real app, log this error instead of displaying it
        die("Errore di connessione al database: " . $e->getMessage());
    }
}
setup_database();

// --- GLOBAL VARIABLES ---
$uploaded_image = null;
$error_message = null;
$gallery_images = [];

// --- DATA FETCHING ---
try {
    $pdo = db();
    // Fetch puzzles
    $stmt = $pdo->query("SELECT id, file_name, name FROM puzzles WHERE is_public = 1 OR is_admin_upload = 1 ORDER BY created_at DESC");
    $gallery_images = $stmt->fetchAll(PDO::FETCH_ASSOC);

    // Fetch leaderboard
    $leaderboard_stmt = $pdo->query("
        SELECT u.username, s.score
        FROM scores s
        JOIN users u ON s.user_id = u.id
        ORDER BY s.score DESC
        LIMIT 10
    ");
    $leaderboard_scores = $leaderboard_stmt->fetchAll(PDO::FETCH_ASSOC);

} catch (PDOException $e) {
    $error_message = "Impossibile caricare i dati della pagina.";
    // Optionally log the error: error_log($e->getMessage());
}


// --- POST REQUEST: IMAGE UPLOAD ---
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['puzzle_image'])) {
    $target_dir = 'uploads/';
    $max_file_size = 5 * 1024 * 1024; // 5 MB
    $allowed_types = ['image/jpeg', 'image/png', 'image/gif'];
    $file = $_FILES['puzzle_image'];

    if ($file['error'] !== UPLOAD_ERR_OK) {
        $error_message = 'Si è verificato un errore durante il caricamento.';
    } else {
        $finfo = new finfo(FILEINFO_MIME_TYPE);
        $mime_type = $finfo->file($file['tmp_name']);

        if ($file['size'] > $max_file_size) {
            $error_message = 'Il file è troppo grande. La dimensione massima è 5MB.';
        } elseif (!in_array($mime_type, $allowed_types)) {
            $error_message = 'Tipo di file non valido. Sono ammessi solo JPG, PNG, GIF.';
        } else {
            $file_extension = pathinfo($file['name'], PATHINFO_EXTENSION);
            $safe_filename = uniqid('puzzle_', true) . '.' . strtolower($file_extension);
            $target_file = $target_dir . $safe_filename;

            if (move_uploaded_file($file['tmp_name'], $target_file)) {
                // Save to database
                try {
                    $is_public = isset($_POST['share_puzzle']) ? 1 : 0; // Ensure 1 or 0
                    $puzzle_name = !empty($_POST['puzzle_name']) ? trim($_POST['puzzle_name']) : 'Senza Nome';
                    $pdo = db();
                    $stmt = $pdo->prepare("INSERT INTO puzzles (name, file_name, is_public, is_admin_upload) VALUES (?, ?, ?, ?)");
                    $is_admin_upload = 0; // Always false for user uploads
                    $stmt->execute([$puzzle_name, $safe_filename, $is_public, $is_admin_upload]);
                    $new_puzzle_id = $pdo->lastInsertId();
                } catch (PDOException $e) {
                    // Error saving to DB, delete file
                    unlink($target_file);
                    // Log the detailed error for developers: error_log($e->getMessage());
                    $error_message = "Si è verificato un errore nel salvataggio dei dati del puzzle: " . $e->getMessage();
                }

                if (!$error_message) {
                    // Redirect to the new puzzle page
                    header('Location: puzzle.php?id=' . $new_puzzle_id);
                    exit;
                }
            } else {
                $error_message = 'Si è verificato un errore durante il salvataggio del file.';
            }
        }
    }
}

// --- GET REQUESTS ---
// Handle New Game
if (isset($_GET['action']) && $_GET['action'] === 'new') {
    unset($_SESSION['selected_puzzle']);
    header('Location: ' . $_SERVER['PHP_SELF']);
    exit;
}


// --- SET CURRENT IMAGE FOR DISPLAY ---
if (isset($_SESSION['selected_puzzle'])) {
    $uploaded_image = $_SESSION['selected_puzzle'];
}

?>
<?php 
$page_title = 'Photo Puzzle - Gioca e Crea';
$page_description = 'Crea e risolvi puzzle fotografici direttamente nel tuo browser. Scegli dalla nostra galleria o carica la tua immagine.';
require_once 'includes/header.php'; 
?>

    <!-- Main Content -->
<main class="flex-grow-1">
    <div class="main-content">
        <div class="row">
            <!-- Main content (Puzzles) -->
            <div class="col-lg-8">
                <!-- Gallery Section -->
                <section class="hero-section text-center" aria-labelledby="gallery-heading">
                    <h1 id="gallery-heading">Scegli un Puzzle dalla Galleria</h1>
                    <p class="text-secondary fs-5">Oppure crea il tuo e sfida la community.</p>
                </section>

                <section class="puzzle-gallery mb-5" aria-label="Galleria dei Puzzle">
                    <?php if (!empty($gallery_images)): ?>
                        <div class="row row-cols-1 row-cols-sm-2 row-cols-xl-3 puzzle-grid">
                            <?php foreach ($gallery_images as $img): ?>
                                <div class="col">
                                    <a href="puzzle.php?id=<?php echo $img['id']; ?>" class="text-decoration-none">
                                        <div class="puzzle-card h-100">
                                            <img src="uploads/<?php echo htmlspecialchars($img['file_name']); ?>" class="card-img-top" alt="<?php echo htmlspecialchars($img['name']); ?>" style="height: 200px; object-fit: cover;">
                                            <div class="card-body">
                                                <h5 class="card-title"><?php echo htmlspecialchars($img['name']); ?></h5>
                                            </div>
                                        </div>
                                    </a>
                                </div>
                            <?php endforeach; ?>
                        </div>
                    <?php else: ?>
                        <div class="text-center p-5 rounded" style="background: var(--bg-secondary);">
                            <p class="text-secondary">Nessun puzzle disponibile al momento. Caricane uno tu!</p>
                        </div>
                    <?php endif; ?>
                </section>

                <?php if (isset($_SESSION['user_id'])): ?>
                <!-- Upload Section for Logged-in Users -->
                <section class="p-4 rounded" style="background: var(--bg-secondary);" aria-labelledby="upload-heading">
                     <h2 id="upload-heading">Crea un nuovo Puzzle</h2>
                     <p class="text-secondary mb-4">Carica un'immagine per iniziare una nuova sfida.</p>

                    <?php if ($error_message): ?>
                        <div class="alert alert-danger"><?php echo htmlspecialchars($error_message); ?></div>
                    <?php endif; ?>

                    <form action="index.php" method="post" enctype="multipart/form-data">
                        <div class="row g-3">
                            <div class="col-md-6">
                                <label for="puzzle_name" class="form-label">Nome del Puzzle</label>
                                <input type="text" class="form-control" id="puzzle_name" name="puzzle_name" placeholder="Es: Tramonto a Venezia" required>
                            </div>
                            <div class="col-md-6">
                                <label for="puzzle_image_upload" class="form-label">Seleziona immagine (max 5MB)</label>
                                <input class="form-control" type="file" name="puzzle_image" id="puzzle_image_upload" accept="image/jpeg,image/png,image/gif" required>
                            </div>
                        </div>
                        <div class="form-check form-switch my-3">
                            <input class="form-check-input" type="checkbox" role="switch" id="share_puzzle" name="share_puzzle" value="1" checked>
                            <label class="form-check-label" for="share_puzzle">Condividi nella galleria pubblica</label>
                        </div>
                        <div class="text-start">
                            <button type="submit" class="btn btn-primary">Crea e Gioca</button>
                        </div>
                    </form>
                </section>
                <?php endif; ?>
            </div>

            <!-- Leaderboard Sidebar -->
            <div class="col-lg-4">
                <aside class="leaderboard-sidebar">
                    <h2 class="leaderboard-title">Top 10 Giocatori</h2>
                    <p class="leaderboard-subtitle mb-3">La classifica dei maestri del puzzle.</p>
                    <?php if (!empty($leaderboard_scores)): ?>
                        <table class="table table-borderless">
                            <thead>
                                <tr>
                                    <th>#</th>
                                    <th>Utente</th>
                                    <th>Punteggio</th>
                                </tr>
                            </thead>
                            <tbody>
                            <?php foreach ($leaderboard_scores as $index => $score): ?>
                                <tr>
                                    <td><?php echo $index + 1; ?></td>
                                    <td><?php echo htmlspecialchars($score['username']); ?></td>
                                    <td><?php echo htmlspecialchars($score['score']); ?></td>
                                </tr>
                            <?php endforeach; ?>
                            </tbody>
                        </table>
                    <?php else: ?>
                        <p class="text-secondary">Nessun punteggio ancora. Inizia a giocare!</p>
                    <?php endif; ?>
                    <div class="text-center mt-3">
                        <a href="leaderboard.php" class="btn btn-outline-cyan">Vedi Classifica Completa</a>
                    </div>
                </aside>
            </div>
        </div>
    </div>
</main>

    <?php require_once 'includes/footer.php'; ?>