import 'controllers/reader_settings_controller.dart'
    show ReaderSettingsController;
import 'pages/mews_urls.dart';

/// Applies the change an action address encodes, e.g. mews:do/set-theme.
/// Returns whether anything changed, so the navigator can skip a rerender that
/// would show the same page.
///
/// An unknown verb or a missing argument does nothing and reports nothing: the
/// only links carrying these addresses are the ones the client builds, so a
/// miss is a bug rather than something to explain to the reader.
class InternalActions {
  InternalActions({required ReaderSettingsController settings})
      : _settings = settings;

  final ReaderSettingsController _settings;

  Future<bool> apply(String url) async {
    final verb = MewsUrls.verbOf(url);
    if (verb == null) return false;
    final args = Uri.parse(url).queryParameters;
    return switch (verb) {
      'set-font' => _settings.setFont(args['value'] ?? ''),
      'set-size' => _setSize(args['step']),
      'set-theme' => _settings.setThemeMode(args['value'] ?? ''),
      'set-colors' => _settings.setVariant(args['value'] ?? ''),
      _ => false,
    };
  }

  Future<bool> _setSize(String? step) => switch (step) {
    'up' => _settings.increaseSize(),
    'down' => _settings.decreaseSize(),
    _ => Future.value(false),
  };
}