import "dart:async";

import "package:flutter/foundation.dart";
import "package:quotegen_client/services/quote_api_v2.dart";


// tracks whether the render backend is reachable, so the ui can hide stuff
// that actually needs it (video render, snapshot links etc) when its down
class BackendStatusProvider extends ChangeNotifier {

  // start optimistic - dont want everything flashing away before the first check lands
  bool isOnline = true;
  bool hasChecked = false;

  Timer? _pollTimer;
  bool _disposed = false;

  BackendStatusProvider() {
    checkNow();
    _pollTimer = Timer.periodic(const Duration(seconds: 15), (_) => checkNow());
  }

  Future<void> checkNow() async {
    final online = await QuoteGeneratorApiV2.checkHealth();

    if (_disposed) return;

    hasChecked = true;

    if (online != isOnline) {
      isOnline = online;
      notifyListeners();
    }
  }

  @override
  void dispose() {
    _disposed = true;
    _pollTimer?.cancel();
    super.dispose();
  }
}