<?php
// upload.php - One Page Upload and Details Submission

require_once 'includes/globals.php';
require_once 'vendor/autoload.php';

use DJMixHosting\Upload;
use DJMixHosting\CDN;
use DJMixHosting\Database;
use DJMixHosting\Genres;
use DJMixHosting\DJs;

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

// If the form was submitted, check which step we're processing via an "action" field.
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Step 1: Handle file upload
    if (isset($_POST['action']) && $_POST['action'] === 'upload_file') {
        if (isset($_FILES['mix_file'])) {
            $upload = new Upload($_FILES['mix_file'], $config);

            // Validate the file
            if (!$upload->validate()) {
                $_SESSION['error'] = implode(", ", $upload->getErrors());
                header("Location: /upload");
                exit;
            }
            // Move the file to the temporary directory
            if (!$upload->moveFile()) {
                $_SESSION['error'] = implode(", ", $upload->getErrors());
                header("Location: /upload");
                exit;
            }
            // Process the file (extract metadata for MP3/ZIP)
            $uploadTask = $upload->process();
            $_SESSION['upload_task'] = $uploadTask;
            // Reload the page so the details form can be shown
            header("Location: /upload");
            exit;
        }
    }
    // Step 2: Handle mix details submission
    elseif (isset($_POST['action']) && $_POST['action'] === 'submit_details') {
        if (!isset($_SESSION['upload_task'])) {
            $_SESSION['error'] = $locale['noUploadedFileFound'];
            header("Location: /upload");
            exit;
        }

        $uploadTask = $_SESSION['upload_task'];
        $title         = trim($_POST['title'] ?? '');
        $description   = trim($_POST['description'] ?? '');
        $recorded      = trim($_POST['recorded'] ?? '');
        $selectedGenres = $_POST['genres'] ?? [];  // array of genre IDs
        $dj1           = $_POST['dj1'] ?? 0;
        $dj2           = $_POST['dj2'] ?? 0;
        $dj3           = $_POST['dj3'] ?? 0;

        // Basic validation: title is required
        if (empty($title)) {
            $_SESSION['error'] = $locale['mixTitleRequired'];
            header("Location: /upload");
            exit;
        }

        // Simple slugify function
        function slugify($text): string
        {
            $text = preg_replace('~[^\pL\d]+~u', '-', $text);
            $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
            $text = preg_replace('~[^-\w]+~', '', $text);
            $text = trim($text, '-');
            $text = preg_replace('~-+~', '-', $text);
            $text = strtolower($text);
            return empty($text) ? 'n-a' : $text;
        }
        $slug = slugify($title);

        // Upload the file to the CDN
        $cdn = new CDN($config);
        $remotePath = "temp/mixes/" . uniqid() . "_" . basename($uploadTask['local_path']);
        $mimeType = ($uploadTask['ext'] === 'mp3') ? 'audio/mpeg' : 'application/zip';

        try {
            $cdn->uploadFile($uploadTask['local_path'], $remotePath, $mimeType, 'private');
        } catch (Exception $e) {
            $_SESSION['error'] = $locale['errorUploadCDN'] . $e->getMessage();
            header("Location: /upload");
            exit;
        }

        // Insert the mix record into the database
        $db = new Database($config);
        $stmt = $db->prepare("INSERT INTO mix (title, slug, description, cover, url, seconds, mediaplayer, dj1, dj2, dj3, pending, recorded) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 1, ?)");

        if ($uploadTask['file_type'] === 'mp3') {
            $seconds = (int)$uploadTask['metadata']['duration'];
            $mediaplayer = 0;
        } elseif ($uploadTask['file_type'] === 'zip') {
            $seconds = (int)$uploadTask['metadata']['total_duration'];
            $mediaplayer = 1;
        } else {
            $seconds = 0;
            $mediaplayer = 1;
        }
        $url = $remotePath;
        $dj1 = (int)$dj1;
        $dj2 = (int)$dj2;
        $dj3 = (int)$dj3;
        $cover = "";
        $stmt->bind_param("sssssiiiiss", $title, $slug, $description, $cover, $url, $seconds, $mediaplayer, $dj1, $dj2, $dj3, $recorded);
        if (!$stmt->execute()) {
            $_SESSION['error'] = $locale['errorSavingMixDB'];
            header("Location: /upload");
            exit;
        }
        $mixId = $stmt->insert_id;
        $stmt->close();

        // Insert mix_meta entries for genres and tracklist
        foreach ($selectedGenres as $genreId) {
            $stmt = $db->prepare("INSERT INTO mix_meta (mix_id, attribute, value) VALUES (?, 'genre', ?)");
            $stmt->bind_param("is", $mixId, $genreId);
            $stmt->execute();
            $stmt->close();
        }
        if ($uploadTask['file_type'] === 'mp3' && !empty($uploadTask['metadata']['title'])) {
            $tracklist = $uploadTask['metadata']['title'];
            $stmt = $db->prepare("INSERT INTO mix_meta (mix_id, attribute, value) VALUES (?, 'tracklist', ?)");
            $stmt->bind_param("is", $mixId, $tracklist);
            $stmt->execute();
            $stmt->close();
        } elseif ($uploadTask['file_type'] === 'zip' && !empty($uploadTask['metadata']['tracklist'])) {
            $tracklist = implode("\n", $uploadTask['metadata']['tracklist']);
            $stmt = $db->prepare("INSERT INTO mix_meta (mix_id, attribute, value) VALUES (?, 'tracklist', ?)");
            $stmt->bind_param("is", $mixId, $tracklist);
            $stmt->execute();
            $stmt->close();
        }

        // Cleanup: delete the local temporary file and clear session upload task
        unlink($uploadTask['local_path']);
        unset($_SESSION['upload_task']);

        $_SESSION['success'] = $locale['uploadedPendingApproval'];
        header("Location: /profile");
        exit;
    }
}

require_once 'includes/header.php'; ?>

<section class="upload-section py-5">
    <div class="container">
        <?php
        // Display any error messages
        if (isset($_SESSION['error'])) {
            echo '<div class="alert alert-danger">' . htmlspecialchars($_SESSION['error']) . '</div>';
            unset($_SESSION['error']);
        }
        // If no file has been uploaded, show the file upload form.
        if (!isset($_SESSION['upload_task'])):
            ?>
            <div class="card">
                <div class="card-body">
                    <h3 class="card-title mb-4"><?php echo $locale['uploadHeader1'];?></h3>
                    <!-- Info Alert -->
                    <div class="alert alert-info">
                        <h4 class="alert-heading"><?php echo $locale['uploadAlertHeader'];?></h4>
                        <p><?php echo $locale['uploadAlert1'];?></p>
                    </div>
                    <!-- Requirements -->
                    <h4 class="mb-3"><?php echo $locale['uploadHeader2'];?></h4>
                    <ul class="list-group list-group-flush mb-4">
                        <li class="list-group-item">
                            <i class="fas fa-check-circle text-success me-2"></i>
                            <?php echo $locale['uploadAlert2'];?>
                        </li>
                        <li class="list-group-item">
                            <i class="fas fa-check-circle text-success me-2"></i>
                            <?php echo $locale['uploadAlert3'];?>
                        </li>
                        <li class="list-group-item">
                            <i class="fas fa-info-circle text-primary me-2"></i>
                            <?php echo $locale['uploadAlert4'];?>
                        </li>
                    </ul>
                    <!-- Process Steps -->
                    <h4 class="mb-3"><?php echo $locale['uploadProcess'];?></h4>
                    <ol class="list-group list-group-numbered mb-4">
                        <li class="list-group-item"><?php echo $locale['uploadProcess1'];?></li>
                        <li class="list-group-item"><?php echo $locale['uploadProcess2'];?></li>
                        <li class="list-group-item"><?php echo $locale['uploadProcess3'];?></li>
                        <li class="list-group-item"><?php echo $locale['uploadProcess4'];?></li>
                    </ol>
                    <!-- Upload Form -->
                    <div class="card mt-4">
                        <div class="card-body">
                            <h4 class="card-title mb-4"><?php echo $locale['uploadAMix'];?></h4>
                            <form action="/upload" method="post" enctype="multipart/form-data">
                                <input type="hidden" name="action" value="upload_file">
                                <div class="mb-3">
                                    <label for="mix_file" class="form-label"><?php echo $locale['uploadSelectMix'];?></label>
                                    <?php
                                    // we need to take the file extensions from config allowed_file_types and comma separate them with periods
                                    $acceptedFileTypes = implode(",", array_map(function($ext) { return "." . $ext; }, $config['uploads']['allowed_file_types']));
                                    ?>
                                    <input type="file" class="form-control" id="mix_file" name="mix_file" accept="<?php echo $acceptedFileTypes; ?>" required>
                                    <div class="form-text"><?php echo $locale['uploadMaxFileSize'];?></div>
                                </div>
                                <button type="submit" class="btn btn-primary">
                                    <i class="fas fa-upload me-2"></i><?php echo $locale['uploadFile'];?>
                                </button>
                            </form>
                        </div>
                    </div>
                </div>
            </div>
        <?php
        // If an upload task exists, show the mix details form.
        else:
            $uploadTask = $_SESSION['upload_task'];
            // Load available genres and DJs for the form
            $db = new Database($config);
            $genresObj = new Genres($db);
            $allGenres = $genresObj->get_all_genres();
            $djsObj = new DJs($db);
            $allDJs = $djsObj->get_all_djs();
            ?>
            <div class="card">
                <div class="card-body">
                    <h3 class="card-title mb-4">Enter Mix Details</h3>
                    <div class="card mb-4">
                        <div class="card-body">
                            <h5>File Summary</h5>
                            <p><strong>Original Name:</strong> <?php echo htmlspecialchars($uploadTask['original_name']); ?></p>
                            <p><strong>File Type:</strong> <?php echo htmlspecialchars(strtoupper($uploadTask['file_type'])); ?></p>
                            <p><strong>Size:</strong> <?php echo round($uploadTask['size'] / 1024, 2); ?> KB</p>
                            <?php if ($uploadTask['file_type'] === 'mp3'): ?>
                                <p><strong>Duration:</strong> <?php echo htmlspecialchars($uploadTask['metadata']['duration']); ?> seconds</p>
                            <?php elseif ($uploadTask['file_type'] === 'zip'): ?>
                                <p><strong>Total Duration:</strong> <?php echo htmlspecialchars($uploadTask['metadata']['total_duration']); ?> seconds</p>
                            <?php endif; ?>
                        </div>
                    </div>
                    <form action="/upload" method="post" class="needs-validation" novalidate>
                        <input type="hidden" name="action" value="submit_details">
                        <div class="mb-3">
                            <label for="title" class="form-label"><?php echo $locale['mixName'];?></label>
                            <input type="text" class="form-control" id="title" name="title" required>
                        </div>
                        <div class="mb-3">
                            <label for="description" class="form-label"><?php echo $locale['mixDescription'];?></label>
                            <textarea class="form-control" id="description" name="description" rows="3"></textarea>
                        </div>
                        <div class="mb-3">
                            <label for="recorded" class="form-label"><?php echo $locale['recordedDate'];?></label>
                            <input type="date" class="form-control" id="recorded" name="recorded" required>
                        </div>
                        <div class="mb-3">
                            <label for="genres" class="form-label"><?php echo $locale['uploadSelectGenres'];?></label>
                            <select class="form-select" id="genres" name="genres[]" multiple required>
                                <?php foreach ($allGenres as $genre): ?>
                                    <option value="<?php echo htmlspecialchars($genre['id']); ?>"><?php echo htmlspecialchars($genre['name']); ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="mb-3">
                            <label class="form-label"><?php echo $locale['uploadSelectDJSMax3'];?></label>
                            <div class="row">
                                <div class="col">
                                    <select class="form-select" name="dj1" required>
                                        <option value=""><?php echo $locale['uploadSelectDJ1'];?></option>
                                        <?php foreach ($allDJs as $dj): ?>
                                            <option value="<?php echo htmlspecialchars($dj['id']); ?>"><?php echo htmlspecialchars($dj['name']); ?></option>
                                        <?php endforeach; ?>
                                    </select>
                                </div>
                                <div class="col">
                                    <select class="form-select" name="dj2">
                                        <option value=""><?php echo $locale['uploadSelectDJ2'];?></option>
                                        <?php foreach ($allDJs as $dj): ?>
                                            <option value="<?php echo htmlspecialchars($dj['id']); ?>"><?php echo htmlspecialchars($dj['name']); ?></option>
                                        <?php endforeach; ?>
                                    </select>
                                </div>
                                <div class="col">
                                    <select class="form-select" name="dj3">
                                        <option value=""><?php echo $locale['uploadSelectDJ3'];?></option>
                                        <?php foreach ($allDJs as $dj): ?>
                                            <option value="<?php echo htmlspecialchars($dj['id']); ?>"><?php echo htmlspecialchars($dj['name']); ?></option>
                                        <?php endforeach; ?>
                                    </select>
                                </div>
                            </div>
                        </div>
                        <button type="submit" class="btn btn-primary"><?php echo $locale['uploadSubmitMix'];?></button>
                    </form>
                </div>
            </div>
        <?php endif; ?>
    </div>
</section>

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