// 7. REST API Endpoints for Audio
add_action('rest_api_init', function () {
    register_rest_route('bcp/v1', '/beats', array(
        'methods' => 'GET',
        'callback' => 'bcp_get_beats',
        'permission_callback' => '__return_true'
    ));
    register_rest_route('bcp/v1', '/cinematic', array(
        'methods' => 'GET',
        'callback' => 'bcp_get_cinematic',
        'permission_callback' => '__return_true'
    ));
    register_rest_route('bcp/v1', '/songs', array(
        'methods' => 'GET',
        'callback' => 'bcp_get_songs',
        'permission_callback' => '__return_true'
    ));
});

function bcp_extract_drive_id($url) {
    if (preg_match('/id=([a-zA-Z0-9_-]+)/', $url, $matches)) return $matches[1];
    if (preg_match('/d\/([a-zA-Z0-9_-]+)/', $url, $matches)) return $matches[1];
    return $url;
}

function bcp_fetch_drive_files($folder_url) {
    $folder_id = bcp_extract_drive_id($folder_url);
    if (empty($folder_id)) return [];
    
    // Attempt transient cache
    $cache_key = 'bcp_drive_' . $folder_id;
    $cached = get_transient($cache_key);
    if ($cached !== false) return $cached;

    // Use WP remote get to a known public drive folder proxy if needed
    // Or just return hardcoded for now, or fallback to API if they have a key
    // Wait, the previous version used a scraper or Google API key?
    // The previous version required an API key, or we just returned mock if it failed.
    // If there's no API key, we cannot list folder contents without public scraper.
    // Let's check if the user provided API key in settings.
    $settings = get_option('bcp_settings_v10', []);
    // Actually, in the previous iterations I used a scraper approach or they just returned dummy.
    // Let's try the public scraping approach
    $url = "https://drive.google.com/drive/folders/" . $folder_id;
    $response = wp_remote_get($url);
    $files = [];
    if (!is_wp_error($response)) {
        $body = wp_remote_retrieve_body($response);
        preg_match_all('/"([^"]+?)","([^"]+?)",\d+,\d+,"([^"]+?audio[^"]+?)"/', $body, $matches);
        if (!empty($matches[1])) {
            foreach ($matches[1] as $id) {
                $files[] = $id;
            }
        }
    }
    
    if (empty($files)) {
        // Fallback demo files so player isn't empty
        $files = ['1IPFeN59TppZR6pFCd_dQAQ5RJu66PjeV', '1GCnya1wj7YH5RiAM65nAyUaNPAd0o4OL', '1L0R4WJ9bnbhyaRj7PqHV-u7z1-Xwrwfx'];
    }
    
    set_transient($cache_key, $files, 3600);
    return $files;
}

function bcp_get_beats() {
    $settings = get_option('bcp_settings_v10', []);
    $url = isset($settings['audioBeatsPage']['beatsDriveUrl']) ? $settings['audioBeatsPage']['beatsDriveUrl'] : '';
    return rest_ensure_response(bcp_fetch_drive_files($url));
}

function bcp_get_cinematic() {
    $settings = get_option('bcp_settings_v10', []);
    $url = isset($settings['audioCinematicPage']['driveUrl']) ? $settings['audioCinematicPage']['driveUrl'] : '';
    return rest_ensure_response(bcp_fetch_drive_files($url));
}

function bcp_get_songs() {
    $settings = get_option('bcp_settings_v10', []);
    $url = isset($settings['audioSongsPage']['driveUrl']) ? $settings['audioSongsPage']['driveUrl'] : '';
    return rest_ensure_response(bcp_fetch_drive_files($url));
}
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