import 'package:flutter/cupertino.dart';
import 'package:please_pay_me/core/config/app_config.dart';
import 'package:please_pay_me/core/storage/session_storage.dart';
import 'package:please_pay_me/data/demo/demo_backend.dart';
import 'package:please_pay_me/features/auth/session_controller.dart';
import 'package:please_pay_me/features/budgets/budgets_controller.dart';
import 'package:please_pay_me/features/journal/journal_controller.dart';
import 'package:please_pay_me/features/work/jobs_controller.dart';
import 'package:please_pay_me/theme/theme.dart';
import 'package:provider/provider.dart';

/// Wires real app screens to the in-memory [DemoBackend] so the catalog shows
/// production widgets with production state management.
class DemoScope extends StatefulWidget {
  const DemoScope({super.key, required this.child, this.seeded = true});

  final Widget child;

  /// `false` renders the empty states (no budgets / jobs / operations).
  final bool seeded;

  @override
  State<DemoScope> createState() => _DemoScopeState();
}

class _DemoScopeState extends State<DemoScope> {
  late DemoBackend _backend;
  late SessionController _session;

  @override
  void initState() {
    super.initState();
    _build();
  }

  @override
  void didUpdateWidget(DemoScope oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.seeded != widget.seeded) _build();
  }

  void _build() {
    _backend = widget.seeded ? DemoBackend() : DemoBackend.empty();
    _session = SessionController(
      config: AppConfig.demo,
      storage: InMemorySessionStorage(),
      demoBackend: _backend,
    )..startDemo();
  }

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      key: ValueKey(widget.seeded),
      providers: [
        ChangeNotifierProvider<SessionController>.value(value: _session),
        ChangeNotifierProvider<ThemeController>(
          create: (_) => ThemeController(store: MemoryThemeStore()),
        ),
        ChangeNotifierProvider(
          create: (_) => BudgetsController(
            budgets: _backend.budgets,
            expenses: _backend.expenses,
          )..load(),
        ),
        ChangeNotifierProvider(
          create: (_) => JournalController(expenses: _backend.expenses)..load(),
        ),
        ChangeNotifierProvider(
          create: (_) => JobsController(jobs: _backend.jobs)..load(),
        ),
      ],
      child: widget.child,
    );
  }
}