<?php
// upload.php - Step 1: File upload and immediate processing

require_once 'includes/globals.php';

// Ensure user is authenticated
if (!isset($_SESSION['user'])) {
    header("Location: login.php");
    exit;
}

// Process the form submission
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['mix_file'])) {
    // Get upload config from $config
    $tmpPath = rtrim($config['uploads']['tmp_path'], '/') . '/';
    $maxFileSize = $config['uploads']['max_file_size'];
    $allowedMimeTypes = $config['uploads']['allowed_mime_type'];
    $allowedFileTypes = $config['uploads']['allowed_file_types'];

    $file = $_FILES['mix_file'];

    // Basic file validations
    if ($file['error'] !== UPLOAD_ERR_OK) {
        $_SESSION['error'] = "File upload error.";
        header("Location: upload.php");
        exit;
    }
    if ($file['size'] > $maxFileSize) {
        $_SESSION['error'] = "File is too large.";
        header("Location: upload.php");
        exit;
    }
    // Get file extension and mime type
    $ext = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    if (!in_array($ext, $allowedFileTypes)) {
        $_SESSION['error'] = "File type not allowed.";
        header("Location: upload.php");
        exit;
    }
    if (!in_array($file['type'], $allowedMimeTypes)) {
        $_SESSION['error'] = "MIME type not allowed.";
        header("Location: upload.php");
        exit;
    }

    // Create a unique temporary filename
    $uniqueName = uniqid() . "." . $ext;
    $destination = $tmpPath . $uniqueName;

    if (!move_uploaded_file($file['tmp_name'], $destination)) {
        $_SESSION['error'] = "Failed to save uploaded file.";
        header("Location: upload.php");
        exit;
    }

    // Process the file: if mp3, extract metadata; if zip, extract each mp3's metadata.
    $uploadTask = [];
    $uploadTask['original_name'] = $file['name'];
    $uploadTask['local_path'] = $destination;
    $uploadTask['size'] = $file['size'];
    $uploadTask['ext'] = $ext;

    if ($ext === "mp3") {
        // Process MP3 file using shell_exec calls (ensure you sanitize arguments)
        $escapedFile = escapeshellarg($destination);
        $artist = trim(shell_exec("eyed3 --query='%a%' $escapedFile"));
        $title = trim(shell_exec("eyed3 --query='%t%' $escapedFile"));
        $duration = trim(shell_exec("mp3info -p \"%S\" $escapedFile"));
        // You can extract additional info as needed
        $uploadTask['file_type'] = 'mp3';
        $uploadTask['metadata'] = [
            'artist' => $artist,
            'title' => $title,
            'duration' => $duration, // in seconds
        ];
        $uploadTask['mediaplayer'] = 1;
    } elseif ($ext === "zip") {
        // Process ZIP file using ZipArchive
        $zip = new ZipArchive;
        if ($zip->open($destination) === true) {
            $totalDuration = 0;
            $tracklist = [];
            for ($i = 0; $i < $zip->numFiles; $i++) {
                $entryName = $zip->getNameIndex($i);
                $entryExt = strtolower(pathinfo($entryName, PATHINFO_EXTENSION));
                if ($entryExt === "mp3") {
                    // Extract the MP3 temporarily to process metadata
                    $tempDir = $tmpPath . uniqid('zip_');
                    mkdir($tempDir);
                    $tempFilePath = $tempDir . '/' . basename($entryName);
                    $zip->extractTo($tempDir, $entryName);
                    $escapedFile = escapeshellarg($tempFilePath);
                    $title = trim(shell_exec("eyed3 --query='%t%' $escapedFile"));
                    $duration = trim(shell_exec("mp3info -p \"%S\" $escapedFile"));
                    $tracklist[] = $title ?: basename($entryName);
                    $totalDuration += (int)$duration;
                    unlink($tempFilePath);
                    rmdir($tempDir);
                }
            }
            $zip->close();
            $uploadTask['file_type'] = 'zip';
            $uploadTask['metadata'] = [
                'tracklist' => $tracklist,
                'total_duration' => $totalDuration,
            ];
            // Mark ZIPs as download only (no mediaplayer)
            $uploadTask['mediaplayer'] = 0;
        } else {
            $_SESSION['error'] = "Failed to open ZIP file.";
            header("Location: upload.php");
            exit;
        }
    } else {
        $_SESSION['error'] = "Unsupported file type.";
        header("Location: upload.php");
        exit;
    }

    // Save the upload task details in session so step 2 can use them.
    $_SESSION['upload_task'] = $uploadTask;
    header("Location: upload_details.php");
    exit;
}

require_once 'includes/header.php';
?>

<section class="upload-section py-5">
    <div class="container">
        <h2 class="mb-4">Upload a New Mix</h2>
        <?php
        if (isset($_SESSION['error'])) {
            echo '<div class="alert alert-danger">' . htmlspecialchars($_SESSION['error']) . '</div>';
            unset($_SESSION['error']);
        }
        ?>
        <form action="upload.php" method="post" enctype="multipart/form-data">
            <div class="mb-3">
                <label for="mix_file" class="form-label">Select Mix File (MP3 or ZIP)</label>
                <input type="file" class="form-control" id="mix_file" name="mix_file" accept=".mp3,.zip" required>
            </div>
            <!-- Optionally, add album art upload here later -->
            <button type="submit" class="btn btn-primary">Upload File</button>
        </form>
    </div>
</section>

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