<?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();
    $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);
} catch (PDOException $e) {
    $error_message = "Impossibile caricare la galleria.";
}


// --- 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'];
}

?>
<!DOCTYPE html>
<html lang="it">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Photo Puzzle</title>
    <meta name="description" content="Crea e risolvi puzzle fotografici direttamente nel tuo browser. Scegli dalla nostra galleria o carica la tua immagine.">
    
    <!-- Open Graph -->
    <meta property="og:title" content="Photo Puzzle - Gioca Ora!">
    <meta property="og:description" content="Un gioco di puzzle moderno dove puoi usare le tue immagini o scegliere dalla galleria.">
    <meta property="og:type" content="website">
    <meta property="og:url" content=""> <!-- Add site URL here -->
    <meta property="og:image" content="https://picsum.photos/1200/630?random=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
    
    <!-- Custom CSS -->
    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
</head>
<body class="d-flex flex-column min-vh-100">

    <!-- Sticky Header -->
    <header class="navbar navbar-expand-lg sticky-top">
        <div class="container-fluid">
            <a class="navbar-brand fw-bold text-cyan" href="index.php">Photo Puzzle</a>
            
            <div class="d-flex align-items-center ms-auto">
                <div class="me-2 me-md-3">
                    <label for="difficulty" class="form-label visually-hidden">Difficoltà</label>
                    <select class="form-select form-select-sm" id="difficulty">
                        <option value="32">Facile</option>
                        <option value="48">Medio</option>
                        <option value="64">Difficile</option>                    
                    </select>
                </div>
                <a href="?action=new" class="btn btn-cyan btn-sm">Nuova Partita</a>
            </div>
        </div>
    </header>

    <!-- Main Content -->
    <main class="container-fluid my-3 my-md-4 flex-grow-1">

        <!-- Gallery Section -->
        <?php if (!empty($gallery_images)): ?>
        <section class="mb-4" aria-labelledby="gallery-heading">
            <h2 id="gallery-heading" class="h4 text-cyan">Galleria Pubblica</h2>
            <div class="gallery-scroll-container d-flex gap-3 pb-3">
                <?php foreach ($gallery_images as $img): ?>
                    <a href="puzzle.php?id=<?php echo $img['id']; ?>" class="gallery-item" title="<?php echo htmlspecialchars($img['name']); ?>">
                        <img src="uploads/<?php echo htmlspecialchars($img['file_name']); ?>" alt="<?php echo htmlspecialchars($img['name']); ?>" loading="lazy" class="rounded-xl">
                    </a>
                <?php endforeach; ?>
            </div>
        </section>
        <?php endif; ?>

        <div class="row g-3 g-md-4">
            <!-- Puzzle Board -->
            <section class="col-lg-8" aria-labelledby="puzzle-board-heading">
                <div class="puzzle-board rounded-xl d-flex align-items-center justify-content-center p-3">
                    <div class="text-center w-100">
                        <h1 id="puzzle-board-heading" class="visually-hidden">Tavola del Puzzle</h1>
                        
                        <?php if ($error_message): ?>
                            <div class="alert alert-danger"><?php echo htmlspecialchars($error_message); ?></div>
                        <?php endif; ?>

                        <?php if ($uploaded_image && file_exists($uploaded_image)): ?>
                            <img src="<?php echo htmlspecialchars($uploaded_image); ?>" alt="Immagine del puzzle caricata" class="img-fluid rounded-xl">
                        <?php else: ?>
                            <h2 class="h4 text-cyan">Crea un nuovo Puzzle</h2>
                            <p class="text-slate-400 mb-4">Carica un'immagine per iniziare.</p>
                            
                            <form action="index.php" method="post" enctype="multipart/form-data" style="max-width: 500px; margin: auto;">
                                <div class="mb-3 text-start">
                                    <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="mb-3 text-start">
                                    <label for="puzzle_image_upload" class="form-label">Seleziona immagine</label>
                                    <input class="form-control" type="file" name="puzzle_image" id="puzzle_image_upload" accept="image/jpeg,image/png,image/gif" required>
                                </div>
                                
                                <div class="form-check form-switch mb-3 text-start">
                                    <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-center">
                                    <button type="submit" class="btn btn-cyan">Crea Puzzle</button>
                                </div>
                            </form>
                        <?php endif; ?>
                    </div>
                </div>
            </section>

            <!-- Pieces Tray -->
            <aside class="col-lg-4" aria-labelledby="pieces-tray-heading">
                <div class="pieces-tray p-3">
                    <h2 id="pieces-tray-heading" class="h4 text-cyan mb-3">Pezzi</h2>
                    <div class="d-flex justify-content-center align-items-center" style="min-height: 200px;">
                        <p class="text-slate-400">I pezzi del puzzle appariranno qui.</p>
                    </div>
                    <!-- Pieces will be dynamically added here -->
                </div>
            </aside>
        </div>
    </main>

    <!-- Footer -->
    <footer class="text-center text-slate-400 py-3 mt-auto">
        <small>&copy; <?php echo date("Y"); ?> Photo Puzzle. Creato con ❤️.</small>
        <small class="d-block"><a href="admin.php" class="text-slate-400">Admin</a></small>
    </footer>

    <!-- Bootstrap JS -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
    <!-- Custom JS -->
    <script src="assets/js/main.js?v=<?php echo time(); ?>"></script>
</body>
</html>