import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/analytics/analytics_page_name.dart';
import 'package:patbond_flutter/analytics/analytics_route_observer.dart';
import 'package:patbond_flutter/analytics/page_view_tracker.dart';

void main() {
  group('AnalyticsRouteObserver', () {
    testWidgets('push 路由报 page_viewed', (tester) async {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });
      final observer = AnalyticsRouteObserver(tracker: tracker);

      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: [observer],
          home: Builder(
            builder: (context) => ElevatedButton(
              onPressed: () => Navigator.of(context).push(
                MaterialPageRoute<void>(
                  settings: RouteSettings(
                    name: AnalyticsPageName.login.pageName,
                  ),
                  builder: (_) => const Placeholder(),
                ),
              ),
              child: const Text('Go'),
            ),
          ),
        ),
      );
      await tester.tap(find.text('Go'));
      await tester.pumpAndSettle();

      expect(events, hasLength(1));
      expect(events.first['event'], 'page_viewed');
      expect(events.first['pageName'], 'login');
    });

    testWidgets('push 两页 referrer 链正确，pop 返回补报前一页', (tester) async {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });
      final observer = AnalyticsRouteObserver(tracker: tracker);

      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: [observer],
          home: Builder(
            builder: (context) => ElevatedButton(
              onPressed: () => Navigator.of(context).push(
                MaterialPageRoute<void>(
                  settings: RouteSettings(
                    name: AnalyticsPageName.login.pageName,
                  ),
                  builder: (loginContext) => ElevatedButton(
                    onPressed: () => Navigator.of(loginContext).push(
                      MaterialPageRoute<void>(
                        settings: RouteSettings(
                          name: AnalyticsPageName.register.pageName,
                        ),
                        builder: (registerContext) => ElevatedButton(
                          onPressed: () => Navigator.of(registerContext).pop(),
                          child: const Text('Back'),
                        ),
                      ),
                    ),
                    child: const Text('Next'),
                  ),
                ),
              ),
              child: const Text('Go'),
            ),
          ),
        ),
      );
      await tester.tap(find.text('Go'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('Next'));
      await tester.pumpAndSettle();

      // push 两页：两条事件，referrer 链正确（06 §5.2 验收 5）。
      expect(events.map((e) => e['pageName']), ['login', 'register']);
      expect(events[0].containsKey('referrer'), isFalse);
      expect(events[1]['referrer'], 'login');

      // pop 返回：didPop 补报重新曝光的前一页，referrer 为弹出页。
      await tester.tap(find.text('Back'));
      await tester.pumpAndSettle();
      expect(events, hasLength(3));
      expect(events[2]['pageName'], 'login');
      expect(events[2]['referrer'], 'register');
    });

    testWidgets('pop 回无名根路由经 resolveRootPage 补报', (tester) async {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });
      final observer = AnalyticsRouteObserver(
        tracker: tracker,
        resolveRootPage: () => AnalyticsPageName.home,
      );

      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: [observer],
          home: Builder(
            builder: (context) => ElevatedButton(
              onPressed: () => Navigator.of(context).push(
                MaterialPageRoute<void>(
                  settings: RouteSettings(
                    name: AnalyticsPageName.profile.pageName,
                  ),
                  builder: (innerContext) => ElevatedButton(
                    onPressed: () => Navigator.of(innerContext).pop(),
                    child: const Text('Back'),
                  ),
                ),
              ),
              child: const Text('Go'),
            ),
          ),
        ),
      );
      await tester.tap(find.text('Go'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('Back'));
      await tester.pumpAndSettle();

      expect(events.map((e) => e['pageName']), ['profile', 'home']);
      expect(events[1]['referrer'], 'profile');
    });

    testWidgets('未在枚举的路由名不上报', (tester) async {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });
      final observer = AnalyticsRouteObserver(tracker: tracker);

      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: [observer],
          home: Builder(
            builder: (context) => ElevatedButton(
              onPressed: () => Navigator.of(context).push(
                MaterialPageRoute<void>(
                  settings: const RouteSettings(name: '/debug/unknown'),
                  builder: (_) => const Placeholder(),
                ),
              ),
              child: const Text('Go'),
            ),
          ),
        ),
      );
      await tester.tap(find.text('Go'));
      await tester.pumpAndSettle();

      expect(events, isEmpty);
    });

    testWidgets('dialog 不上报（PopupRoute 不是 PageRoute）', (tester) async {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });
      final observer = AnalyticsRouteObserver(tracker: tracker);

      await tester.pumpWidget(
        MaterialApp(
          navigatorObservers: [observer],
          home: Builder(
            builder: (context) => ElevatedButton(
              onPressed: () => showDialog<void>(
                context: context,
                builder: (_) => const AlertDialog(title: Text('Dialog')),
              ),
              child: const Text('Show'),
            ),
          ),
        ),
      );
      await tester.tap(find.text('Show'));
      await tester.pumpAndSettle();

      expect(events, isEmpty);
    });
  });

  group('PageViewTracker', () {
    test('连续相同页面去重（Tab 重复点选）', () {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });

      tracker.report(AnalyticsPageName.home);
      tracker.report(AnalyticsPageName.home);
      tracker.report(AnalyticsPageName.profile);
      tracker.report(AnalyticsPageName.home);

      expect(events, hasLength(3));
      expect(events.map((e) => e['pageName']), ['home', 'profile', 'home']);
    });

    test('referrer 链跨机制连贯（首页无 referrer）', () {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });

      tracker.report(AnalyticsPageName.home);
      tracker.report(AnalyticsPageName.login);
      tracker.report(AnalyticsPageName.profile);

      expect(events[0].containsKey('referrer'), isFalse);
      expect(events[1]['referrer'], 'home');
      expect(events[2]['referrer'], 'login');
    });

    test('reportTab 记录当前 Tab', () {
      final events = <Map<String, dynamic>>[];
      final tracker = PageViewTracker((name, [props]) async {
        events.add({'event': name, ...?props});
      });

      tracker.reportTab(AnalyticsPageName.petArchive);
      expect(tracker.currentTab, AnalyticsPageName.petArchive);
      expect(events.single['pageName'], 'pet_archive');
    });
  });
}