import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_app/core/network/api_repository.dart';
import 'package:flutter_app/core/settings/local_settings_store.dart';
import 'package:flutter_app/features/chat/presentation/cubit/chat_cubit.dart';
import 'package:flutter_app/features/chat/presentation/cubit/chat_state.dart';

class _VersionTestApi extends ApiRepository {
  _VersionTestApi() : super(baseUrl: 'http://127.0.0.1:8000');

  final responses = <List<String>>[
    ['الجواب الأول'],
    ['الجواب الثاني'],
  ];
  SavedConversation? lastSaved;
  String? indexedWorkspace;
  List<String> indexedFiles = const [];
  List<String> deletedFiles = const [];

  @override
  Future<String> getModelName() async => 'gemma4:e2b';

  @override
  Future<List<ModelDescriptor>> getAvailableModels() async => const [
    ModelDescriptor(
      id: 'gemma4:e2b',
      capabilities: ['completion', 'vision', 'audio', 'tools'],
      capabilitiesVerified: true,
    ),
    ModelDescriptor(
      id: 'granite-embedding:278m',
      capabilities: ['embedding'],
      capabilitiesVerified: true,
    ),
  ];

  @override
  Future<List<AgentSkillDescriptor>> getAgentSkills() async => const [
    AgentSkillDescriptor(
      id: 'code_explain',
      name: 'شرح الكود',
      description: 'شرح المصدر.',
    ),
    AgentSkillDescriptor(
      id: 'code_review',
      name: 'مراجعة الكود',
      description: 'مراجعة المصدر.',
    ),
    AgentSkillDescriptor(
      id: 'test_plan',
      name: 'خطة اختبارات',
      description: 'اقتراح الاختبارات.',
    ),
  ];

  @override
  Future<List<SavedConversation>> listConversations() async => [];

  @override
  Future<List<String>> listWorkspaceFiles(String workspacePath) async => [
    'README.md',
  ];

  @override
  Future<Map<String, dynamic>> indexWorkspaceKnowledge(
    String workspacePath,
    List<String> files,
  ) async {
    indexedWorkspace = workspacePath;
    indexedFiles = files;
    return {
      'indexed': [
        for (final file in files) {'path': file, 'chunks': 2},
      ],
    };
  }

  @override
  Future<Map<String, dynamic>> deleteWorkspaceKnowledge(
    String workspacePath,
    List<String> files,
  ) async {
    deletedFiles = files;
    return {
      'deleted': [
        for (final file in files) {'path': file, 'deleted': true},
      ],
    };
  }

  @override
  Future<void> saveConversation(SavedConversation conversation) async {
    lastSaved = conversation;
  }

  @override
  Stream<String> completeStream(List<ChatMessage> messages, {String? model}) =>
      Stream<String>.fromIterable(responses.removeAt(0));
}

class _CancellableTestApi extends _VersionTestApi {
  final controller = StreamController<String>();
  var cancelled = false;
  final storedConversation = SavedConversation(
    id: 'conversation',
    title: 'سؤال قديم',
    updatedAt: DateTime.utc(2026),
    messages: const [
      ChatMessage('سؤال قديم', fromUser: true),
      ChatMessage(
        'إجابة محفوظة',
        fromUser: false,
        answerVersions: ['إجابة محفوظة'],
      ),
    ],
  );

  @override
  Future<SavedConversation> getConversation(String id) async =>
      storedConversation;

  @override
  Stream<String> completeStream(List<ChatMessage> messages, {String? model}) =>
      controller.stream;

  @override
  void cancelActiveRequest() {
    cancelled = true;
    controller.close();
  }
}

class _MemorySettingsStore extends LocalSettingsStore {
  final values = <String, Object?>{};

  @override
  bool get persistenceAvailable => true;

  @override
  Future<Map<String, Object?>> read() async => Map.of(values);

  @override
  Future<bool> update(Map<String, Object?> updates) async {
    values.addAll(updates);
    return true;
  }
}

void main() {
  test('embedding-only models are not selectable for chat', () async {
    final api = _VersionTestApi();
    final cubit = ChatCubit(api, settingsStore: LocalSettingsStore.inMemory());
    await Future<void>.delayed(Duration.zero);

    expect(cubit.state.availableModels.map((model) => model.id), [
      'gemma4:e2b',
    ]);

    await cubit.close();
  });

  test('selected workspace files can be indexed as local knowledge', () async {
    final api = _VersionTestApi();
    final cubit = ChatCubit(api, settingsStore: LocalSettingsStore.inMemory());
    await Future<void>.delayed(Duration.zero);

    await cubit.selectWorkspace(r'C:\Projects\sample');
    cubit.selectWorkspaceFiles(['README.md']);
    final message = await cubit.indexSelectedWorkspaceKnowledge();

    expect(api.indexedWorkspace, r'C:\Projects\sample');
    expect(api.indexedFiles, ['README.md']);
    expect(message, contains('2 مقطعًا'));
    expect(cubit.state.agentProgress, isNull);

    final removal = await cubit.removeSelectedWorkspaceKnowledge();
    expect(api.deletedFiles, ['README.md']);
    expect(removal, contains('أُزيل 1 ملف'));
    await cubit.close();
  });

  test('regeneration keeps prior answers and selection is persisted', () async {
    final api = _VersionTestApi();
    final cubit = ChatCubit(api, settingsStore: LocalSettingsStore.inMemory());
    await Future<void>.delayed(Duration.zero);

    await cubit.send('ما معنى API؟');
    expect(cubit.state.messages.last.answerVersions, ['الجواب الأول']);
    expect(cubit.state.modelStatus, ModelConnectionStatus.connected);
    expect(cubit.state.requestStatus, RequestStatus.completed);
    expect(cubit.state.lastResponseDuration, isNotNull);

    await cubit.regenerateLastAnswer();
    expect(cubit.state.messages.last.text, 'الجواب الثاني');
    expect(cubit.state.messages.last.answerVersions, [
      'الجواب الأول',
      'الجواب الثاني',
    ]);
    expect(cubit.state.messages.last.selectedVersion, 1);

    await cubit.selectAnswerVersion(1, 0);
    expect(cubit.state.messages.last.text, 'الجواب الأول');
    expect(cubit.state.messages.last.selectedVersion, 0);
    expect(api.lastSaved?.messages.last.answerVersions, [
      'الجواب الأول',
      'الجواب الثاني',
    ]);
    expect(api.lastSaved?.messages.last.selectedVersion, 0);

    await cubit.close();
  });

  test(
    'local API, model, and notification settings survive Cubit restart',
    () async {
      final settings = _MemorySettingsStore();
      final firstApi = _VersionTestApi();
      final first = ChatCubit(firstApi, settingsStore: settings);
      await Future<void>.delayed(Duration.zero);
      await Future<void>.delayed(Duration.zero);

      expect(await first.setApiBaseUrl('file:///unsafe'), isFalse);
      expect(firstApi.baseUrl, 'http://127.0.0.1:8000');
      expect(await first.setApiBaseUrl('http://127.0.0.1:9123'), isTrue);
      await first.setNotificationsEnabled(false);
      await first.setDarkMode(true);
      first.selectModel('gemma4:e2b');
      await Future<void>.delayed(Duration.zero);
      await first.close();

      final restoredApi = _VersionTestApi();
      final restored = ChatCubit(restoredApi, settingsStore: settings);
      await Future<void>.delayed(Duration.zero);
      await Future<void>.delayed(Duration.zero);

      expect(restored.state.apiBaseUrl, 'http://127.0.0.1:9123');
      expect(restored.state.notificationsEnabled, isFalse);
      expect(restored.state.isDarkMode, isTrue);
      expect(restored.state.selectedModel, 'gemma4:e2b');
      await Future<void>.delayed(Duration.zero);
      restored.selectAgentSkill('code_review');
      expect(restored.state.selectedSkillId, 'code_review');
      restored.selectAgentSkill('unknown');
      expect(restored.state.selectedSkillId, 'code_review');
      restored.selectAgentSkill(null);
      expect(restored.state.selectedSkillId, isNull);
      await restored.close();
    },
  );

  test(
    'cancelling generation preserves partial text and records duration',
    () async {
      final api = _CancellableTestApi();
      final cubit = ChatCubit(
        api,
        settingsStore: LocalSettingsStore.inMemory(),
      );
      await Future<void>.delayed(Duration.zero);

      final send = cubit.send('اكتب فقرة قصيرة');
      await Future<void>.delayed(const Duration(milliseconds: 20));
      api.controller.add('بداية الإجابة');
      await Future<void>.delayed(Duration.zero);
      await cubit.cancelGeneration();
      await send;

      expect(api.cancelled, isTrue);
      expect(cubit.state.isSending, isFalse);
      expect(cubit.state.requestStatus, RequestStatus.cancelled);
      expect(cubit.state.messages.last.text, 'بداية الإجابة');
      expect(cubit.state.lastResponseDuration, isNotNull);
      expect(api.lastSaved?.messages.last.text, 'بداية الإجابة');

      await cubit.close();
      await api.controller.close();
    },
  );

  test(
    'cancelling regeneration before its first token keeps saved answer',
    () async {
      final api = _CancellableTestApi();
      final cubit = ChatCubit(
        api,
        settingsStore: LocalSettingsStore.inMemory(),
      );
      await Future<void>.delayed(Duration.zero);
      await cubit.openConversation(api.storedConversation);

      final regeneration = cubit.regenerateLastAnswer();
      await Future<void>.delayed(const Duration(milliseconds: 20));
      await cubit.cancelGeneration();
      await regeneration;

      expect(cubit.state.messages.last.text, 'إجابة محفوظة');
      expect(api.lastSaved?.messages.last.text, 'إجابة محفوظة');
      expect(cubit.state.requestStatus, RequestStatus.cancelled);

      await cubit.close();
      await api.controller.close();
    },
  );
}