import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/network/api_exception.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';
import 'package:patbond_flutter/core/widgets/empty_state_illustration.dart';
import 'package:patbond_flutter/features/pets/pet_detail_page.dart';
import 'package:patbond_flutter/features/pets/pet_form_page.dart';
import 'package:patbond_flutter/features/pets/pet_models.dart';
import 'package:patbond_flutter/features/pets/pets_controller.dart';
import 'package:patbond_flutter/features/pets/pets_page.dart';

import '../../helpers/pet_test_helpers.dart';

class _RecordingNavObserver extends NavigatorObserver {
  final pushedNames = <String?>[];

  @override
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
    pushedNames.add(route.settings.name);
  }
}

void main() {
  late FakePetsRepository repository;
  late PetsController controller;
  late _RecordingNavObserver observer;

  setUp(() {
    repository = FakePetsRepository();
    controller = PetsController(repository: repository);
    observer = _RecordingNavObserver();
  });

  Future<void> pumpPage(WidgetTester tester) {
    return tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        navigatorObservers: [observer],
        home: Scaffold(body: PetsPage(controller: controller)),
      ),
    );
  }

  testWidgets('四态 · loading：拉取期间居中转圈', (tester) async {
    final completer = Completer<List<Pet>>();
    repository.listPetsHandler = () => completer.future;

    await pumpPage(tester);
    await tester.pump();

    expect(find.byType(CircularProgressIndicator), findsOneWidget);

    completer.complete(const []);
    await tester.pumpAndSettle();
    expect(find.byType(CircularProgressIndicator), findsNothing);
  });

  testWidgets('四态 · empty：空态插画 + 建档 CTA 打开 pet_form 表单页', (tester) async {
    await pumpPage(tester);
    await tester.pumpAndSettle();

    expect(find.byType(EmptyStateIllustration), findsOneWidget);
    expect(find.text('还没有宠物档案'), findsOneWidget);

    await tester.tap(find.text('添加宠物'));
    await tester.pumpAndSettle();

    expect(find.byType(PetFormPage), findsOneWidget);
    // page_viewed(pet_form) 接线依据：路由名进入既有 RouteObserver 采集。
    expect(observer.pushedNames.last, 'pet_form');
  });

  testWidgets('四态 · error/retry：横幅 + 重试按钮，重试后恢复列表', (tester) async {
    var calls = 0;
    repository.listPetsHandler = () async {
      calls++;
      if (calls == 1) throw const ApiNetworkException('断网');
      return [buildPet('p-1')];
    };

    await pumpPage(tester);
    await tester.pumpAndSettle();

    expect(find.text('网络异常，请检查网络后重试'), findsOneWidget);
    expect(find.text('重试'), findsOneWidget);

    await tester.tap(find.text('重试'));
    await tester.pumpAndSettle();

    expect(find.text('豆豆'), findsOneWidget);
  });

  testWidgets('四态 · ready：列表卡渲染名字与元信息，含添加入口', (tester) async {
    repository.listPetsHandler = () async => [
      buildPet('p-1'),
      buildPet(
        'p-2',
        name: '咪咪',
        overrides: {
          'species': 'cat',
          'sex': 'female',
          'breedId': null,
          'breedDisplayName': null,
          'customBreedName': '狸花',
        },
      ),
    ];

    await pumpPage(tester);
    await tester.pumpAndSettle();

    expect(find.text('我的宠物'), findsOneWidget);
    expect(find.text('豆豆'), findsOneWidget);
    expect(find.text('咪咪'), findsOneWidget);
    expect(find.textContaining('柴犬 · 男孩'), findsOneWidget);
    expect(find.textContaining('狸花 · 女孩'), findsOneWidget);
    expect(find.text('＋ 添加宠物'), findsOneWidget);
    expect(find.text('添加'), findsOneWidget);
  });

  testWidgets('点宠物卡 → 以 pet_detail 路由名进入详情页', (tester) async {
    repository.listPetsHandler = () async => [buildPet('p-1')];
    repository.getPetHandler = (petId) async => buildPet('p-1');

    await pumpPage(tester);
    await tester.pumpAndSettle();

    await tester.tap(find.text('豆豆'));
    await tester.pumpAndSettle();

    expect(find.byType(PetDetailPage), findsOneWidget);
    expect(observer.pushedNames.last, 'pet_detail');
  });

  testWidgets('非 active 宠物显示状态标签（走失中）', (tester) async {
    repository.listPetsHandler = () async => [
      buildPet('p-1', overrides: {'status': 'lost'}),
    ];

    await pumpPage(tester);
    await tester.pumpAndSettle();

    expect(find.text('走失中'), findsOneWidget);
  });
}