import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../core/cache/cached.dart';
import '../../core/widgets/scope_selector.dart';
import '../../core/widgets/stale_banner.dart';
import 'calendar_tab.dart';
import 'forecast_tab.dart';
import 'history_tab.dart';
import 'providers.dart';

/// Доходы: the dividend/coupon calendar, the paid history and the forecast — three views of
/// one question, so three tabs of one screen rather than three navigation destinations.
///
/// One offline banner covers all three tabs (`docs/ai/offline-cache.md`): they share a
/// scope and `TabBarView` builds all of them eagerly anyway, so watching all three
/// providers here to compute it costs nothing extra.
class IncomePage extends ConsumerWidget {
  const IncomePage({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final stale = oldestFetch([
      ref.watch(incomeCalendarProvider).valueOrNull?.fetchedAt,
      ref.watch(incomeHistoryProvider).valueOrNull?.fetchedAt,
      ref.watch(incomeForecastProvider).valueOrNull?.fetchedAt,
    ]);

    return DefaultTabController(
      length: 3,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Доходы'),
          actions: [
            const ScopeSelector(),
            IconButton(
              tooltip: 'Обновить',
              icon: const Icon(Icons.refresh),
              onPressed: () => invalidateIncomeProviders(ref),
            ),
          ],
          bottom: const TabBar(
            tabs: [Tab(text: 'Календарь'), Tab(text: 'История'), Tab(text: 'Прогноз')],
          ),
        ),
        body: Column(
          children: [
            if (stale != null)
              Padding(
                padding: const EdgeInsets.fromLTRB(16, 12, 16, 0),
                child: StaleBanner(fetchedAt: stale),
              ),
            const Expanded(
              child: TabBarView(
                children: [IncomeCalendarTab(), IncomeHistoryTab(), IncomeForecastTab()],
              ),
            ),
          ],
        ),
      ),
    );
  }
}