import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/network/api_exception.dart';
import 'package:patbond_flutter/features/pets/pet_exceptions.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);
  });

  test('初始态为 initial，不发请求', () {
    expect(controller.phase, PetsLoadPhase.initial);
    expect(controller.pets, isEmpty);
    expect(controller.isEmpty, isFalse);
  });

  test('refresh 成功：loading → ready，列表就位', () async {
    repository.listPetsHandler = () async => [buildPet('p-1'), buildPet('p-2')];
    final phases = <PetsLoadPhase>[];
    controller.addListener(() => phases.add(controller.phase));

    await controller.refresh();

    expect(phases, [PetsLoadPhase.loading, PetsLoadPhase.ready]);
    expect(controller.pets.map((p) => p.id), ['p-1', 'p-2']);
    expect(controller.isEmpty, isFalse);
    expect(controller.lastError, isNull);
  });

  test('refresh 空列表：ready 且 isEmpty（新用户空态）', () async {
    repository.listPetsHandler = () async => [];

    await controller.refresh();

    expect(controller.phase, PetsLoadPhase.ready);
    expect(controller.isEmpty, isTrue);
  });

  test('refresh 失败：error 态保留类型化错误，重试可恢复', () async {
    repository.listPetsHandler = () async =>
        throw const ApiNetworkException('断网');

    await controller.refresh();

    expect(controller.phase, PetsLoadPhase.error);
    expect(controller.lastError, isA<ApiNetworkException>());

    repository.listPetsHandler = () async => [buildPet('p-1')];
    await controller.refresh();

    expect(controller.phase, PetsLoadPhase.ready);
    expect(controller.lastError, isNull);
    expect(controller.pets, hasLength(1));
  });

  test('createPet：成功后插入列表头', () async {
    repository.listPetsHandler = () async => [buildPet('p-1')];
    await controller.refresh();
    repository.createPetHandler = (request) async =>
        buildPet('p-2', name: '咪咪');

    final created = await controller.createPet(
      const CreatePetRequest(
        name: '咪咪',
        species: PetSpecies.cat,
        sex: PetSex.female,
        customBreedName: '狸花',
      ),
    );

    expect(created.id, 'p-2');
    expect(controller.pets.map((p) => p.id), ['p-2', 'p-1']);
  });

  test('createPet 失败（40903）：类型化异常外抛，列表不变', () async {
    repository.listPetsHandler = () async => [buildPet('p-1')];
    await controller.refresh();
    repository.createPetHandler = (request) async =>
        throw const MicrochipTakenException(message: '芯片号已被登记');

    await expectLater(
      controller.createPet(
        const CreatePetRequest(
          name: '咪咪',
          species: PetSpecies.cat,
          sex: PetSex.female,
          customBreedName: '狸花',
        ),
      ),
      throwsA(isA<MicrochipTakenException>()),
    );
    expect(controller.pets, hasLength(1));
  });

  test('updatePet：成功后同步列表内存副本', () async {
    repository.listPetsHandler = () async => [buildPet('p-1', version: 1)];
    await controller.refresh();
    repository.updatePetHandler = (petId, request) async =>
        buildPet('p-1', name: '豆豆二世', version: 2);

    await controller.updatePet(
      'p-1',
      const UpdatePetRequest(version: 1, name: '豆豆二世'),
    );

    expect(controller.pets.single.name, '豆豆二世');
    expect(controller.pets.single.version, 2);
  });

  test('updatePet 版本冲突（40902）：异常外抛供页面提示刷新重提', () async {
    repository.updatePetHandler = (petId, request) async =>
        throw const PetVersionConflictException(message: '数据已被修改');

    await expectLater(
      controller.updatePet('p-1', const UpdatePetRequest(version: 1)),
      throwsA(isA<PetVersionConflictException>()),
    );
  });

  test('getPet：详情结果回写列表副本', () async {
    repository.listPetsHandler = () async => [buildPet('p-1', version: 1)];
    await controller.refresh();
    repository.getPetHandler = (petId) async => buildPet('p-1', version: 5);

    final detail = await controller.getPet('p-1');

    expect(detail.version, 5);
    expect(controller.pets.single.version, 5);
  });

  test('loadBreeds：按物种缓存，仓库只打一次', () async {
    var calls = 0;
    repository.listBreedsHandler = (species) async {
      calls++;
      return [Breed.fromJson(sampleBreedJson())];
    };

    final first = await controller.loadBreeds(PetSpecies.dog);
    final second = await controller.loadBreeds(PetSpecies.dog);

    expect(first.single.displayName, '柴犬');
    expect(identical(first, second), isTrue);
    expect(calls, 1);

    await controller.loadBreeds(PetSpecies.cat);
    expect(calls, 2);
  });

  test('loadBreeds 失败：异常外抛且不缓存，重试可恢复', () async {
    var calls = 0;
    repository.listBreedsHandler = (species) async {
      calls++;
      if (calls == 1) throw const ApiNetworkException('断网');
      return [Breed.fromJson(sampleBreedJson())];
    };

    await expectLater(
      controller.loadBreeds(PetSpecies.dog),
      throwsA(isA<ApiNetworkException>()),
    );
    final breeds = await controller.loadBreeds(PetSpecies.dog);
    expect(breeds, hasLength(1));
  });

  test('reset：登出清空回 initial（含品种缓存）', () async {
    repository.listPetsHandler = () async => [buildPet('p-1')];
    var breedCalls = 0;
    repository.listBreedsHandler = (species) async {
      breedCalls++;
      return [Breed.fromJson(sampleBreedJson())];
    };
    await controller.refresh();
    await controller.loadBreeds(PetSpecies.dog);

    controller.reset();

    expect(controller.phase, PetsLoadPhase.initial);
    expect(controller.pets, isEmpty);
    expect(controller.lastError, isNull);
    await controller.loadBreeds(PetSpecies.dog);
    expect(breedCalls, 2);
  });
}