<?php
/**
 * Modifica Lezione
 * 
 * Form per modificare una videolezione o lezione live esistente
 */

require_once '../includes/config.php';
require_once '../includes/functions.php';

session_start();
check_session_timeout();
require_admin();

$error = '';
$success = false;
$lesson = null;

// Verifica che sia stato passato un ID valido
$lesson_id = isset($_GET['id']) ? intval($_GET['id']) : 0;

if ($lesson_id <= 0) {
    set_flash_message('error', 'ID lezione non valido');
    header('Location: lessons.php');
    exit;
}

$pdo = get_db_connection();

// Carica i dati della lezione
try {
    $stmt = $pdo->prepare("SELECT * FROM lessons WHERE id = ?");
    $stmt->execute([$lesson_id]);
    $lesson = $stmt->fetch();
    
    if (!$lesson) {
        set_flash_message('error', 'Lezione non trovata');
        header('Location: lessons.php');
        exit;
    }
} catch (PDOException $e) {
    set_flash_message('error', 'Errore durante il caricamento della lezione');
    header('Location: lessons.php');
    exit;
}

// Processa il form
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $title = sanitize_input($_POST['title'] ?? '');
    $description = sanitize_input($_POST['description'] ?? '');
    $type = $_POST['type'] ?? 'video';
    $level = $_POST['level'] ?? 'principiante';
    $category = sanitize_input($_POST['category'] ?? '');
    $price = floatval($_POST['price'] ?? 0);
    $duration = !empty($_POST['duration']) ? intval($_POST['duration']) : null;
    $video_url = sanitize_input($_POST['video_url'] ?? '') ?: $lesson['video_url']; // Mantieni il vecchio se non specificato
    $video_platform = $_POST['video_platform'] ?? 'local';
    $live_url = sanitize_input($_POST['live_url'] ?? '');
    $live_platform = sanitize_input($_POST['live_platform'] ?? '');
    $live_date = !empty($_POST['live_date']) ? $_POST['live_date'] : null;
    $is_demo = isset($_POST['is_demo']) ? 1 : 0;
    $is_active = isset($_POST['is_active']) ? 1 : 0;
    
    // Gestione upload nuovo file locale (opzionale)
    if ($type === 'video' && $video_platform === 'local' && isset($_FILES['video_file']) && $_FILES['video_file']['error'] === UPLOAD_ERR_OK) {
        $upload_dir = $is_demo ? '../uploads/lessons/demo/' : '../uploads/lessons/pay/';
        
        // Crea le cartelle se non esistono
        if (!is_dir($upload_dir)) {
            mkdir($upload_dir, 0755, true);
        }
        
        // Crea nome file sicuro
        $file_extension = strtolower(pathinfo($_FILES['video_file']['name'], PATHINFO_EXTENSION));
        $allowed_extensions = ['mp4', 'webm', 'ogg', 'mov'];
        
        if (!in_array($file_extension, $allowed_extensions)) {
            $error = 'Formato video non supportato. Usa: mp4, webm, ogg, mov';
        } else {
            $file_name = uniqid('video_') . '_' . time() . '.' . $file_extension;
            $upload_path = $upload_dir . $file_name;
            
            if (move_uploaded_file($_FILES['video_file']['tmp_name'], $upload_path)) {
                // Elimina il vecchio file se esisteva
                $old_video_path = ltrim($lesson['video_url'], '/');
                if (!empty($lesson['video_url']) && file_exists('../' . $old_video_path)) {
                    @unlink('../' . $old_video_path);
                }
                // Imposta il nuovo percorso (senza slash iniziale)
                $video_url = 'uploads/lessons/' . ($is_demo ? 'demo' : 'pay') . '/' . $file_name;
                
                // Estrai durata automaticamente se non specificata
                if (empty($duration)) {
                    $duration = get_video_duration($upload_path);
                }
            } else {
                $error = 'Errore durante il caricamento del file';
            }
        }
    }
    
    // Validazione
    if (empty($title)) {
        $error = 'Il titolo è obbligatorio';
    } elseif (empty($description)) {
        $error = 'La descrizione è obbligatoria';
    } elseif ($type === 'live' && empty($live_date)) {
        $error = 'Per le lezioni live, la data è obbligatoria';
    } elseif (!$error) {
        try {
            $stmt = $pdo->prepare("
                UPDATE lessons SET
                    title = ?, 
                    description = ?, 
                    type = ?, 
                    video_url = ?, 
                    video_platform = ?, 
                    duration = ?, 
                    live_platform = ?, 
                    live_url = ?, 
                    live_date = ?, 
                    level = ?, 
                    category = ?, 
                    price = ?, 
                    is_demo = ?, 
                    is_active = ?,
                    updated_at = NOW()
                WHERE id = ?
            ");
            
            $stmt->execute([
                $title,
                $description,
                $type,
                $type === 'video' ? $video_url : null,
                $type === 'video' ? $video_platform : null,
                $duration,
                $type === 'live' ? $live_platform : null,
                $type === 'live' ? $live_url : null,
                $live_date,
                $level,
                $category,
                $price,
                $is_demo,
                $is_active,
                $lesson_id
            ]);
            
            set_flash_message('success', 'Lezione aggiornata con successo!');
            header('Location: lessons.php');
            exit;
            
        } catch (PDOException $e) {
            $error = 'Errore durante l\'aggiornamento della lezione';
        }
    }
}
?>
<!DOCTYPE html>
<html lang="it">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Modifica Lezione - Admin</title>
    <link rel="stylesheet" href="../assets/css/style.css">
</head>
<body>
    <header class="header">
        <div class="container">
            <div class="header-content">
                <?php if (file_exists('../uploads/images/logo.png')): ?>
                    <div class="logo">
                        <img src="../uploads/images/logo.png" alt="Pilates Studio" class="logo-image">
                        <span style="margin-left: 10px; color: var(--primary-color); font-weight: 600;">Admin</span>
                    </div>
                <?php else: ?>
                    <h1 class="logo">Pilates Studio - Admin</h1>
                <?php endif; ?>
                <nav class="nav">
                    <a href="lessons.php" class="btn btn-outline">← Torna alle Lezioni</a>
                    <a href="../includes/logout.php" class="btn btn-secondary">Logout</a>
                </nav>
            </div>
        </div>
    </header>

    <div class="container">
        <div class="dashboard">
            <aside class="sidebar">
                <ul class="sidebar-menu">
                    <li><a href="dashboard.php">📊 Dashboard</a></li>
                    <li><a href="lessons.php" class="active">🎥 Gestione Lezioni</a></li>
                    <li><a href="users.php">👥 Gestione Utenti</a></li>
                    <li><a href="purchases.php">💰 Acquisti</a></li>
                    <li><a href="profile.php">👤 Profilo</a></li>
                </ul>
            </aside>

            <main class="main-content">
                <h2 class="section-title" style="text-align: left;">Modifica Lezione</h2>
                
                <?php if ($error): ?>
                    <div class="alert alert-error"><?php echo htmlspecialchars($error); ?></div>
                <?php endif; ?>

                <div class="card">
                    <form method="POST" action="" enctype="multipart/form-data">
                        <!-- Informazioni Base -->
                        <h3 style="margin-bottom: 1rem; color: var(--primary-color);">Informazioni Base</h3>
                        
                        <div class="form-group">
                            <label for="title" class="form-label">Titolo *</label>
                            <input type="text" id="title" name="title" class="form-control" required 
                                   value="<?php echo htmlspecialchars($_POST['title'] ?? $lesson['title']); ?>">
                        </div>
                        
                        <div class="form-group">
                            <label for="description" class="form-label">Descrizione *</label>
                            <textarea id="description" name="description" class="form-control" required 
                                      rows="4"><?php echo htmlspecialchars($_POST['description'] ?? $lesson['description']); ?></textarea>
                        </div>
                        
                        <div class="form-group">
                            <label for="type" class="form-label">Tipo Lezione *</label>
                            <select id="type" name="type" class="form-control" required onchange="toggleTypeFields()">
                                <option value="video" <?php echo ($_POST['type'] ?? $lesson['type']) === 'video' ? 'selected' : ''; ?>>
                                    Videolezione Registrata
                                </option>
                                <option value="live" <?php echo ($_POST['type'] ?? $lesson['type']) === 'live' ? 'selected' : ''; ?>>
                                    Lezione Live
                                </option>
                            </select>
                        </div>
                        
                        <!-- Campi Video -->
                        <div id="video-fields" style="display: <?php echo ($_POST['type'] ?? $lesson['type']) === 'video' ? 'block' : 'none'; ?>;">
                            <h3 style="margin: 2rem 0 1rem; color: var(--primary-color);">Dettagli Video</h3>
                            
                            <div class="form-group">
                                <label for="video_platform" class="form-label">Piattaforma Video</label>
                                <select id="video_platform" name="video_platform" class="form-control" onchange="toggleVideoInput()">
                                    <option value="local" <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 'local' ? 'selected' : ''; ?>>File Locale (Carica dal PC)</option>
                                    <option value="youtube" <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 'youtube' ? 'selected' : ''; ?>>YouTube</option>
                                    <option value="vimeo" <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 'vimeo' ? 'selected' : ''; ?>>Vimeo</option>
                                    <option value="s3" <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 's3' ? 'selected' : ''; ?>>AWS S3</option>
                                </select>
                            </div>
                            
                            <!-- Upload file locale -->
                            <div id="local-upload" class="form-group" style="display: <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 'local' ? 'block' : 'none'; ?>;">
                                <?php if (!empty($lesson['video_url'])): ?>
                                    <div style="margin-bottom: 0.5rem; padding: 0.5rem; background: #e8f4f8; border-radius: 4px;">
                                        <strong>File attuale:</strong> <?php echo htmlspecialchars(basename($lesson['video_url'])); ?>
                                    </div>
                                <?php endif; ?>
                                <label for="video_file" class="form-label">Carica Nuovo Video (opzionale)</label>
                                <input type="file" id="video_file" name="video_file" class="form-control" 
                                       accept="video/mp4,video/webm,video/ogg,video/quicktime">
                                <small class="text-muted">Formati supportati: MP4, WebM, OGG, MOV. Lascia vuoto per mantenere il file attuale.</small>
                            </div>
                            
                            <!-- URL esterno -->
                            <div id="external-url" class="form-group" style="display: <?php echo ($_POST['video_platform'] ?? $lesson['video_platform']) === 'local' ? 'none' : 'block'; ?>;">
                                <label for="video_url" class="form-label">URL Video</label>
                                <input type="text" id="video_url" name="video_url" class="form-control" 
                                       placeholder="es: https://youtube.com/watch?v=..." 
                                       value="<?php echo htmlspecialchars($_POST['video_url'] ?? $lesson['video_url'] ?? ''); ?>">
                                <small class="text-muted">Inserisci l'URL del video sulla piattaforma esterna</small>
                            </div>
                            
                            <div class="form-group">
                                <label for="duration" class="form-label">Durata (minuti)</label>
                                <input type="number" id="duration" name="duration" class="form-control" 
                                       min="1" value="<?php echo htmlspecialchars($_POST['duration'] ?? $lesson['duration'] ?? ''); ?>">
                            </div>
                        </div>
                        
                        <!-- Campi Live -->
                        <div id="live-fields" style="display: <?php echo ($_POST['type'] ?? $lesson['type']) === 'live' ? 'block' : 'none'; ?>;">
                            <h3 style="margin: 2rem 0 1rem; color: var(--primary-color);">Dettagli Lezione Live</h3>
                            
                            <div class="form-group">
                                <label for="live_platform" class="form-label">Piattaforma Live</label>
                                <input type="text" id="live_platform" name="live_platform" class="form-control" 
                                       placeholder="es: Zoom, Google Meet, Teams..." 
                                       value="<?php echo htmlspecialchars($_POST['live_platform'] ?? $lesson['live_platform'] ?? ''); ?>">
                            </div>
                            
                            <div class="form-group">
                                <label for="live_url" class="form-label">Link Lezione Live</label>
                                <input type="text" id="live_url" name="live_url" class="form-control" 
                                       placeholder="es: https://zoom.us/j/..." 
                                       value="<?php echo htmlspecialchars($_POST['live_url'] ?? $lesson['live_url'] ?? ''); ?>">
                            </div>
                            
                            <div class="form-group">
                                <label for="live_date" class="form-label">Data e Ora Lezione *</label>
                                <input type="datetime-local" id="live_date" name="live_date" class="form-control" 
                                       value="<?php 
                                           $live_date = $_POST['live_date'] ?? $lesson['live_date'] ?? '';
                                           // Converti il formato della data per datetime-local (YYYY-MM-DDTHH:MM)
                                           if ($live_date && strpos($live_date, ' ') !== false) {
                                               $live_date = str_replace(' ', 'T', substr($live_date, 0, 16));
                                           }
                                           echo htmlspecialchars($live_date); 
                                       ?>">
                            </div>
                        </div>
                        
                        <!-- Classificazione -->
                        <h3 style="margin: 2rem 0 1rem; color: var(--primary-color);">Classificazione</h3>
                        
                        <div class="form-group">
                            <label for="level" class="form-label">Livello *</label>
                            <select id="level" name="level" class="form-control" required>
                                <option value="principiante" <?php echo ($_POST['level'] ?? $lesson['level']) === 'principiante' ? 'selected' : ''; ?>>
                                    Principiante
                                </option>
                                <option value="intermedio" <?php echo ($_POST['level'] ?? $lesson['level']) === 'intermedio' ? 'selected' : ''; ?>>
                                    Intermedio
                                </option>
                                <option value="avanzato" <?php echo ($_POST['level'] ?? $lesson['level']) === 'avanzato' ? 'selected' : ''; ?>>
                                    Avanzato
                                </option>
                            </select>
                        </div>
                        
                        <div class="form-group">
                            <label for="category" class="form-label">Categoria</label>
                            <input type="text" id="category" name="category" class="form-control" 
                                   placeholder="es: Mat Work, Reformer, Stretching..." 
                                   value="<?php echo htmlspecialchars($_POST['category'] ?? $lesson['category'] ?? ''); ?>">
                        </div>
                        
                        <!-- Prezzo e Disponibilità -->
                        <h3 style="margin: 2rem 0 1rem; color: var(--primary-color);">Prezzo e Disponibilità</h3>
                        
                        <div class="form-group">
                            <label for="price" class="form-label">Prezzo (€) *</label>
                            <input type="number" id="price" name="price" class="form-control" 
                                   min="0" step="0.01" required 
                                   value="<?php echo htmlspecialchars($_POST['price'] ?? $lesson['price']); ?>">
                        </div>
                        
                        <div class="form-group">
                            <label class="form-label">
                                <input type="checkbox" name="is_demo" value="1" 
                                       <?php echo ($_POST['is_demo'] ?? $lesson['is_demo']) ? 'checked' : ''; ?>>
                                Lezione Demo (gratuita per tutti)
                            </label>
                        </div>
                        
                        <div class="form-group">
                            <label class="form-label">
                                <input type="checkbox" name="is_active" value="1" 
                                       <?php echo ($_POST['is_active'] ?? $lesson['is_active']) ? 'checked' : ''; ?>>
                                Lezione attiva (visibile agli utenti)
                            </label>
                        </div>
                        
                        <div class="d-flex gap-1 mt-3">
                            <button type="submit" class="btn btn-primary">Salva Modifiche</button>
                            <a href="lessons.php" class="btn btn-outline">Annulla</a>
                        </div>
                    </form>
                </div>
            </main>
        </div>
    </div>

    <script>
        // Mostra/nascondi campi in base al tipo di lezione
        function toggleTypeFields() {
            const type = document.getElementById('type').value;
            const videoFields = document.getElementById('video-fields');
            const liveFields = document.getElementById('live-fields');
            
            if (type === 'video') {
                videoFields.style.display = 'block';
                liveFields.style.display = 'none';
            } else {
                videoFields.style.display = 'none';
                liveFields.style.display = 'block';
            }
        }
        
        // Mostra/nascondi campi upload/URL in base alla piattaforma
        function toggleVideoInput() {
            const platform = document.getElementById('video_platform').value;
            const localUpload = document.getElementById('local-upload');
            const externalUrl = document.getElementById('external-url');
            
            if (platform === 'local') {
                localUpload.style.display = 'block';
                externalUrl.style.display = 'none';
            } else {
                localUpload.style.display = 'none';
                externalUrl.style.display = 'block';
            }
        }
        
        // Inizializza lo stato al caricamento
        document.addEventListener('DOMContentLoaded', function() {
            toggleVideoInput();
        });
    </script>
    <script src="../assets/js/main.js"></script>
</body>
</html>