// Connecteur web uniquement (import conditionnel).
// ignore_for_file: avoid_web_libraries_in_flutter, deprecated_member_use

import 'dart:html' as html;

/// Connecteur SSE navigateur (EventSource) — ticket #195.
/// Auth via `?access_token=` (EventSource ne permet pas Authorization).
class CardsStreamConnector {
  html.EventSource? _source;
  final Map<String, html.EventListener> _listeners = {};

  Future<void> connect({
    required String url,
    String? bearerToken,
    required void Function(String eventType, String data) onEvent,
    required void Function(Object error) onError,
  }) async {
    close();
    final source = html.EventSource(url);
    _source = source;

    const names = [
      'card.created',
      'card.updated',
      'card.deleted',
      'response.added',
      'heartbeat',
    ];
    for (final name in names) {
      void listener(html.Event raw) {
        final msg = raw as html.MessageEvent;
        final data = msg.data?.toString() ?? '';
        if (data.isEmpty) return;
        onEvent(name, data);
      }

      _listeners[name] = listener;
      source.addEventListener(name, listener);
    }

    void onErr(html.Event _) {
      onError(StateError('SSE cards déconnecté'));
    }

    _listeners['error'] = onErr;
    source.addEventListener('error', onErr);
  }

  void close() {
    final source = _source;
    if (source != null) {
      _listeners.forEach((name, listener) {
        source.removeEventListener(name, listener);
      });
      source.close();
    }
    _listeners.clear();
    _source = null;
  }
}