import 'package:patbond_flutter/core/network/api_client.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:uuid/uuid.dart';

/// pets 域仓库接口（契约 v1.2.0 的 12 路径 / 18 操作全覆盖；
/// 页面依赖此抽象，widget 测试注入假实现）。
abstract class PetsRepository {
  // ---- 宠物 CRUD ----
  Future<List<Pet>> listPets();
  Future<Pet> createPet(CreatePetRequest request);
  Future<Pet> getPet(String petId);
  Future<Pet> updatePet(String petId, UpdatePetRequest request);

  // ---- 字典 ----
  Future<List<Breed>> listBreeds({PetSpecies? species});
  Future<List<VaccineCatalogItem>> listVaccineCatalog({PetSpecies? species});

  // ---- 体重（cursor 分页）----
  Future<CursorPage<WeightRecord>> listWeights(
    String petId, {
    int? limit,
    String? cursor,
  });
  Future<WeightRecord> createWeight(String petId, CreateWeightRequest request);

  // ---- 疫苗 ----
  Future<List<Vaccination>> listVaccinations(String petId);
  Future<Vaccination> createVaccination(
    String petId,
    CreateVaccinationRequest request,
  );
  Future<Vaccination> updateVaccination(
    String vaccinationId,
    UpdateVaccinationRequest request,
  );

  // ---- 健康事件（cursor 分页）----
  Future<CursorPage<HealthEvent>> listHealthEvents(
    String petId, {
    int? limit,
    String? cursor,
  });
  Future<HealthEvent> createHealthEvent(
    String petId,
    CreateHealthEventRequest request,
  );
  Future<HealthEvent> updateHealthEvent(
    String eventId,
    UpdateHealthEventRequest request,
  );

  // ---- 照护提醒 ----
  Future<List<CareReminder>> listCareReminders(
    String petId, {
    CareReminderStatus? status,
  });
  Future<CareReminder> createCareReminder(
    String petId,
    CreateCareReminderRequest request,
  );
  Future<CareReminder> updateCareReminder(
    String reminderId,
    UpdateCareReminderRequest request,
  );

  // ---- 聚合摘要 ----
  Future<PetSummary> getPetSummary(String petId, {String? tz});
}

/// 基于 [ApiClient] 的实现。全部端点走 Bearer 鉴权（复用既有 token
/// 拦截 + 401/40101 单飞刷新重放）；pets 域业务错误码升格为类型化异常。
///
/// 幂等：weights / vaccinations / health-events / care-reminders 四个 POST
/// 按契约携带可选 `Idempotency-Key`（每次逻辑提交换新键；token 刷新后的
/// 自动重放沿用同一个键，与 auth register 先例一致）。
class ApiPetsRepository implements PetsRepository {
  ApiPetsRepository({required this._api, this._uuid = const Uuid()});

  final ApiClient _api;
  final Uuid _uuid;

  Future<Object?> _request(
    String path, {
    String method = 'GET',
    Object? body,
    Map<String, Object?>? query,
    bool idempotent = false,
  }) async {
    try {
      return await _api.request(
        path,
        method: method,
        body: body,
        query: query,
        headers: idempotent ? {'Idempotency-Key': _uuid.v4()} : null,
        requiresAuth: true,
      );
    } on ApiBusinessException catch (error) {
      throw mapPetBusinessException(error);
    }
  }

  Map<String, dynamic> _asMap(Object? data) => data! as Map<String, dynamic>;

  List<T> _asList<T>(Object? data, T Function(Map<String, dynamic>) fromJson) {
    return (data! as List)
        .map((item) => fromJson(item as Map<String, dynamic>))
        .toList();
  }

  @override
  Future<List<Pet>> listPets() async {
    final data = await _request('/api/v1/pets');
    return _asList(data, Pet.fromJson);
  }

  @override
  Future<Pet> createPet(CreatePetRequest request) async {
    final data = await _request(
      '/api/v1/pets',
      method: 'POST',
      body: request.toJson(),
    );
    return Pet.fromJson(_asMap(data));
  }

  @override
  Future<Pet> getPet(String petId) async {
    final data = await _request('/api/v1/pets/$petId');
    return Pet.fromJson(_asMap(data));
  }

  @override
  Future<Pet> updatePet(String petId, UpdatePetRequest request) async {
    final data = await _request(
      '/api/v1/pets/$petId',
      method: 'PATCH',
      body: request.toJson(),
    );
    return Pet.fromJson(_asMap(data));
  }

  @override
  Future<List<Breed>> listBreeds({PetSpecies? species}) async {
    final data = await _request(
      '/api/v1/breeds',
      query: {if (species != null) 'species': species.name},
    );
    return _asList(data, Breed.fromJson);
  }

  @override
  Future<List<VaccineCatalogItem>> listVaccineCatalog({
    PetSpecies? species,
  }) async {
    final data = await _request(
      '/api/v1/vaccine-catalog',
      query: {if (species != null) 'species': species.name},
    );
    return _asList(data, VaccineCatalogItem.fromJson);
  }

  @override
  Future<CursorPage<WeightRecord>> listWeights(
    String petId, {
    int? limit,
    String? cursor,
  }) async {
    final data = await _request(
      '/api/v1/pets/$petId/weights',
      query: {'limit': ?limit, 'cursor': ?cursor},
    );
    return CursorPage.fromJson(_asMap(data), WeightRecord.fromJson);
  }

  @override
  Future<WeightRecord> createWeight(
    String petId,
    CreateWeightRequest request,
  ) async {
    final data = await _request(
      '/api/v1/pets/$petId/weights',
      method: 'POST',
      body: request.toJson(),
      idempotent: true,
    );
    return WeightRecord.fromJson(_asMap(data));
  }

  @override
  Future<List<Vaccination>> listVaccinations(String petId) async {
    final data = await _request('/api/v1/pets/$petId/vaccinations');
    return _asList(data, Vaccination.fromJson);
  }

  @override
  Future<Vaccination> createVaccination(
    String petId,
    CreateVaccinationRequest request,
  ) async {
    final data = await _request(
      '/api/v1/pets/$petId/vaccinations',
      method: 'POST',
      body: request.toJson(),
      idempotent: true,
    );
    return Vaccination.fromJson(_asMap(data));
  }

  @override
  Future<Vaccination> updateVaccination(
    String vaccinationId,
    UpdateVaccinationRequest request,
  ) async {
    final data = await _request(
      '/api/v1/vaccinations/$vaccinationId',
      method: 'PATCH',
      body: request.toJson(),
    );
    return Vaccination.fromJson(_asMap(data));
  }

  @override
  Future<CursorPage<HealthEvent>> listHealthEvents(
    String petId, {
    int? limit,
    String? cursor,
  }) async {
    final data = await _request(
      '/api/v1/pets/$petId/health-events',
      query: {'limit': ?limit, 'cursor': ?cursor},
    );
    return CursorPage.fromJson(_asMap(data), HealthEvent.fromJson);
  }

  @override
  Future<HealthEvent> createHealthEvent(
    String petId,
    CreateHealthEventRequest request,
  ) async {
    final data = await _request(
      '/api/v1/pets/$petId/health-events',
      method: 'POST',
      body: request.toJson(),
      idempotent: true,
    );
    return HealthEvent.fromJson(_asMap(data));
  }

  @override
  Future<HealthEvent> updateHealthEvent(
    String eventId,
    UpdateHealthEventRequest request,
  ) async {
    final data = await _request(
      '/api/v1/health-events/$eventId',
      method: 'PATCH',
      body: request.toJson(),
    );
    return HealthEvent.fromJson(_asMap(data));
  }

  @override
  Future<List<CareReminder>> listCareReminders(
    String petId, {
    CareReminderStatus? status,
  }) async {
    final data = await _request(
      '/api/v1/pets/$petId/care-reminders',
      query: {if (status != null) 'status': status.name},
    );
    return _asList(data, CareReminder.fromJson);
  }

  @override
  Future<CareReminder> createCareReminder(
    String petId,
    CreateCareReminderRequest request,
  ) async {
    final data = await _request(
      '/api/v1/pets/$petId/care-reminders',
      method: 'POST',
      body: request.toJson(),
      idempotent: true,
    );
    return CareReminder.fromJson(_asMap(data));
  }

  @override
  Future<CareReminder> updateCareReminder(
    String reminderId,
    UpdateCareReminderRequest request,
  ) async {
    final data = await _request(
      '/api/v1/care-reminders/$reminderId',
      method: 'PATCH',
      body: request.toJson(),
    );
    return CareReminder.fromJson(_asMap(data));
  }

  @override
  Future<PetSummary> getPetSummary(String petId, {String? tz}) async {
    final data = await _request(
      '/api/v1/pets/$petId/summary',
      query: {'tz': ?tz},
    );
    return PetSummary.fromJson(_asMap(data));
  }
}