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/features/pets/pet_detail_page.dart';
import 'package:patbond_flutter/features/pets/pet_exceptions.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 '../../helpers/pet_test_helpers.dart';

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

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

  Future<void> pumpDetail(WidgetTester tester, {String petId = 'p-1'}) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: const Scaffold(body: Text('列表基底')),
      ),
    );
    final navigator = tester.state<NavigatorState>(find.byType(Navigator));
    unawaited(
      navigator.push(
        MaterialPageRoute<void>(
          builder: (_) => PetDetailPage(controller: controller, petId: petId),
        ),
      ),
    );
    await tester.pump();
  }

  testWidgets('ready：档案字段齐备，owner 可见编辑入口', (tester) async {
    repository.getPetHandler = (petId) async => buildPet(
      'p-1',
      overrides: {
        'microchipNo': '985112000000001',
        'personality': '活泼',
        'sterilizedOn': '2025-06-01',
      },
    );

    await pumpDetail(tester);
    await tester.pumpAndSettle();

    expect(find.text('豆豆'), findsOneWidget);
    expect(find.text('基本资料'), findsOneWidget);
    expect(find.text('柴犬'), findsOneWidget);
    expect(find.text('男孩'), findsOneWidget);
    expect(find.text('2024-03-15'), findsOneWidget);
    expect(find.text('985112000000001'), findsOneWidget);
    expect(find.text('活泼'), findsOneWidget);
    expect(find.text('2025-06-01'), findsOneWidget);
    expect(find.byIcon(Icons.edit_outlined), findsWidgets);
    expect(find.text('编辑资料'), findsOneWidget);
  });

  testWidgets('生日估算标记与未填写字段兜底', (tester) async {
    repository.getPetHandler = (petId) async =>
        buildPet('p-1', overrides: {'birthDateEstimated': true});

    await pumpDetail(tester);
    await tester.pumpAndSettle();

    expect(find.text('2024-03-15（估算）'), findsOneWidget);
    // 芯片号 / 性格 / 绝育日期未填。
    expect(find.text('未填写'), findsNWidgets(3));
  });

  testWidgets('四态 · loading：无内存副本时居中转圈', (tester) async {
    final completer = Completer<Pet>();
    repository.getPetHandler = (petId) => completer.future;

    await pumpDetail(tester);
    await tester.pump();

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

    completer.complete(buildPet('p-1'));
    await tester.pumpAndSettle();
    expect(find.text('豆豆'), findsOneWidget);
  });

  testWidgets('四态 · error/retry：无副本加载失败给横幅与重试', (tester) async {
    var calls = 0;
    repository.getPetHandler = (petId) async {
      calls++;
      if (calls == 1) throw const ApiNetworkException('断网');
      return buildPet('p-1');
    };

    await pumpDetail(tester);
    await tester.pumpAndSettle();

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

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

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

  testWidgets('四态 · notFound（40401）：提示不存在，返回列表并触发刷新', (tester) async {
    repository.getPetHandler = (petId) async =>
        throw const PetNotFoundException(message: '不存在');
    var listCalls = 0;
    repository.listPetsHandler = () async {
      listCalls++;
      return const [];
    };

    await pumpDetail(tester);
    await tester.pumpAndSettle();

    expect(find.text('宠物不存在或已被删除'), findsOneWidget);

    await tester.tap(find.text('返回列表'));
    await tester.pumpAndSettle();

    expect(find.byType(PetDetailPage), findsNothing);
    expect(find.text('列表基底'), findsOneWidget);
    expect(listCalls, 1);
  });

  testWidgets('有内存副本时先渲染副本；后台刷新失败降级 SnackBar', (tester) async {
    repository.listPetsHandler = () async => [buildPet('p-1')];
    await controller.refresh();
    final completer = Completer<Pet>();
    repository.getPetHandler = (petId) => completer.future;

    await pumpDetail(tester);
    await tester.pump();

    // 副本即时渲染，无整页 loading。
    expect(find.text('豆豆'), findsOneWidget);
    expect(find.byType(CircularProgressIndicator), findsNothing);

    completer.completeError(const ApiNetworkException('断网'));
    await tester.pumpAndSettle();

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

  testWidgets('viewer 角色隐藏全部编辑入口（40300 语义）', (tester) async {
    repository.getPetHandler = (petId) async =>
        buildPet('p-1', overrides: {'myRole': 'viewer'});

    await pumpDetail(tester);
    await tester.pumpAndSettle();

    expect(find.byIcon(Icons.edit_outlined), findsNothing);
    expect(find.text('编辑资料'), findsNothing);
    expect(find.byIcon(Icons.edit), findsNothing);
  });

  testWidgets('owner 点编辑 → 进入编辑表单并预填', (tester) async {
    repository.getPetHandler = (petId) async => buildPet('p-1');

    await pumpDetail(tester);
    await tester.pumpAndSettle();

    await tester.tap(find.text('编辑资料'));
    await tester.pumpAndSettle();

    expect(find.byType(PetFormPage), findsOneWidget);
    expect(find.text('编辑宠物资料'), findsOneWidget);
    expect(find.text('豆豆'), findsOneWidget);
  });
}