<?php
require_once 'auth.php';
require_once 'db/config.php';

$pageTitle = "Upload Album - Zeal Music";
$successMessage = "";
$errorMessage = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $pdo = db();
    $userId = $_SESSION['user_id'];

    // Album details
    $artistName = trim($_POST['artist-name'] ?? 'Unknown Artist');
    $albumName = trim($_POST['album-name'] ?? 'Untitled Album');
    $genre = trim($_POST['genre'] ?? '');
    $releaseDate = !empty($_POST['release-date']) ? $_POST['release-date'] : null;

    // Handle Album Art Upload
    $coverArtPath = null;
    if (isset($_FILES['album-art']) && $_FILES['album-art']['error'] == UPLOAD_ERR_OK) {
        $artTmpName = $_FILES['album-art']['tmp_name'];
        $artName = basename($_FILES['album-art']['name']);
        $artExt = pathinfo($artName, PATHINFO_EXTENSION);
        $newArtName = uniqid('art_', true) . '.' . $artExt;
        $coverArtPath = 'uploads/cover_art/' . $newArtName;
        if (!move_uploaded_file($artTmpName, $coverArtPath)) {
            $errorMessage = "Failed to upload album art.";
            $coverArtPath = null;
        }
    }

    // Handle Tracks
    if (empty($errorMessage) && isset($_POST['tracks']) && is_array($_POST['tracks'])) {
        $tracks = $_POST['tracks'];
        $files = $_FILES['tracks'];
        $allSucceeded = true;

        foreach ($tracks as $index => $track) {
            $trackTitle = trim($track['title']);
            
            // Restructure FILES array for easier access
            $audioFile = [
                'name' => $files['name']['audio_file'][$index],
                'type' => $files['type']['audio_file'][$index],
                'tmp_name' => $files['tmp_name']['audio_file'][$index],
                'error' => $files['error']['audio_file'][$index],
                'size' => $files['size']['audio_file'][$index]
            ];

            if (!empty($trackTitle) && $audioFile['error'] == UPLOAD_ERR_OK) {
                $audioTmpName = $audioFile['tmp_name'];
                $audioName = basename($audioFile['name']);
                $audioExt = pathinfo($audioName, PATHINFO_EXTENSION);
                $newAudioName = uniqid('track_', true) . '.' . $audioExt;
                $audioFilePath = 'uploads/music/' . $newAudioName;

                if (move_uploaded_file($audioTmpName, $audioFilePath)) {
                    try {
                        $stmt = $pdo->prepare(
                            "INSERT INTO tracks (user_id, title, album, genre, release_date, file_path, cover_art_path) 
                             VALUES (:user_id, :title, :album, :genre, :release_date, :file_path, :cover_art_path)"
                        );
                        $stmt->execute([
                            ':user_id' => $userId,
                            ':title' => $trackTitle,
                            ':album' => $albumName,
                            ':genre' => $genre,
                            ':release_date' => $releaseDate,
                            ':file_path' => $audioFilePath,
                            ':cover_art_path' => $coverArtPath
                        ]);
                    } catch (PDOException $e) {
                        $errorMessage = "Database error: " . $e->getMessage();
                        $allSucceeded = false;
                        break; // Exit loop on DB error
                    }
                } else {
                    $errorMessage = "Failed to move uploaded audio file for track: " . htmlspecialchars($trackTitle);
                    $allSucceeded = false;
                    break;
                }
            } else {
                 $errorMessage = "Please provide a title and audio file for all tracks. Error code: " . $audioFile['error'];
                 $allSucceeded = false;
                 break;
            }
        }

        if ($allSucceeded) {
            $successMessage = "Album and all tracks submitted successfully!";
        }
    } elseif (empty($errorMessage)) {
        $errorMessage = "No tracks were submitted. Please add at least one track.";
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><?php echo htmlspecialchars($pageTitle); ?></title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
</head>
<body class="dark-theme">
    <div class="page-container">
        <?php include 'partials/sidebar.php'; ?>

        <main class="main-content">
            <header class="main-header">
                <h1>Upload Your Album</h1>
                <div class="user-profile">
                    <i class="fa fa-user-circle"></i>
                    <span><?php echo htmlspecialchars($_SESSION['username']); ?></span>
                </div>
            </header>

            <div class="content-wrapper">
                <div class="upload-form-container">
                    <?php if ($successMessage): ?>
                        <div class="alert alert-success"><?php echo htmlspecialchars($successMessage); ?></div>
                    <?php endif; ?>
                    <?php if ($errorMessage): ?>
                        <div class="alert alert-danger"><?php echo htmlspecialchars($errorMessage); ?></div>
                    <?php endif; ?>

                    <form action="upload.php" method="POST" enctype="multipart/form-data" class="upload-form">
                        
                        <fieldset>
                            <legend>Album Details</legend>
                            <div class="form-group">
                                <label for="artist-name">Artist Name</label>
                                <input type="text" id="artist-name" name="artist-name" value="<?php echo htmlspecialchars($_SESSION['username']); ?>" required>
                            </div>
                            <div class="form-group">
                                <label for="album-name">Album Name</label>
                                <input type="text" id="album-name" name="album-name" placeholder="Enter the album name" required>
                            </div>
                            <div class="form-group">
                                <label for="album-art">Album Art</label>
                                <input type="file" id="album-art" name="album-art" accept="image/png, image/jpeg">
                                <small>Recommended: Square image, 1500x1500px. Applies to all tracks.</small>
                            </div>
                            <div class="form-group">
                                <label for="genre">Genre</label>
                                <input type="text" id="genre" name="genre" placeholder="e.g., Pop, Rock, Hip-Hop">
                            </div>
                            <div class="form-group">
                                <label for="release-date">Release Date</label>
                                <input type="date" id="release-date" name="release-date">
                            </div>
                        </fieldset>
                        
                        <fieldset>
                            <legend>Tracks</legend>
                            <div id="tracks-container">
                                <div class="track-input-group">
                                    <h5>Track 1</h5>
                                    <div class="form-group">
                                        <label for="track-title-0">Track Title</label>
                                        <input type="text" id="track-title-0" name="tracks[0][title]" placeholder="Enter the track title" required>
                                    </div>
                                    <div class="form-group">
                                        <label for="audio-file-0">Audio File</label>
                                        <input type="file" id="audio-file-0" name="tracks[0][audio_file]" accept="audio/mpeg, audio/wav" required>
                                        <small>Required: High-quality MP3 or WAV file.</small>
                                    </div>
                                </div>
                            </div>
                            <button type="button" id="add-track-btn" class="btn btn-secondary">Add Another Track</button>
                        </fieldset>

                        <div class="form-group-checkbox">
                            <input type="checkbox" id="copyright-agree" name="copyright-agree" required>
                            <label for="copyright-agree">I confirm that I own all the rights to this music and agree to the <a href="#">distribution terms</a>.</label>
                        </div>

                        <div class="form-group">
                            <button type="submit" class="btn btn-primary btn-lg">Submit Album</button>
                        </div>
                    </form>
                </div>
            </div>
        </main>
    </div>
    <script src="assets/js/main.js?v=<?php echo time(); ?>"></script>
</body>
</html>