import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:life_helper/data/ai/llm_service.dart';
import 'package:life_helper/state/ai_providers.dart';
import 'package:life_helper/state/chat_providers.dart';
import 'package:life_helper/state/providers.dart';
import 'package:life_helper/ui/screens/chat_screen.dart';

import '../ai/tools/_tool_test_helpers.dart';

/// Widget E2E for #260 (AC-10). Verifies the full chat → tool call →
/// ConfirmDialog → habit DB insert pipeline using a fully wired
/// ChatSessionController, with a `MockLlmService` standing in for Gemma.
void main() {
  testWidgets(
    'add_habit tool call → ConfirmDialog 수행 → 활성 습관 +1',
    (tester) async {
      final ctx = await bootstrapToolDeps();
      addTearDown(() => ctx.db.close());

      final mock = MockLlmService();
      await mock.load();
      // Turn 1 (sendUser): LLM 이 add_habit 호출.
      mock.enqueueChatEvents([
        const LlmFunctionCall('add_habit', {
          'protocol_id': 'morning_sunlight',
          'frame_level': 'L2',
          'framed_text': '아침에 햇빛 보기',
        }),
      ]);
      // Turn 2 (sendToolResult): LLM 이 자연어로 마무리.
      mock.enqueueChatEvents([
        const LlmTextChunk('아침 햇빛 습관을 추가했어요.'),
      ]);

      await tester.pumpWidget(
        ProviderScope(
          overrides: [
            appDatabaseProvider.overrideWithValue(ctx.db),
            llmServiceProvider.overrideWithValue(mock),
            // bootstrapProvider 는 이미 ctx 에서 SeedImporter 가 끝났으므로 no-op.
            bootstrapProvider.overrideWith((ref) async {}),
            // toolDepsProvider 를 미리 resolve 된 형태로 주입.
            toolDepsProvider.overrideWith((ref) async => ctx.deps),
          ],
          child: const MaterialApp(home: ChatScreen()),
        ),
      );
      await tester.pumpAndSettle();

      // 활성 습관 0개에서 시작.
      var habits =
          await ctx.deps.habitDao.activeHabitsForUser(ctx.deps.userId);
      expect(habits, isEmpty);

      // 사용자 입력 → 전송.
      await tester.enterText(find.byType(TextField), '아침 햇빛 추가해줘');
      await tester.tap(find.byIcon(Icons.send));
      await tester.pump(); // userTurn 시작
      await tester.pump(const Duration(milliseconds: 50)); // mock stream

      // ConfirmDialog 가 떠야 한다.
      expect(find.text('이 작업을 수행할까요?'), findsOneWidget);
      expect(find.text('수행'), findsOneWidget);
      expect(find.text('취소'), findsOneWidget);

      // 수행 탭.
      await tester.tap(find.text('수행'));
      await tester.pumpAndSettle();

      // 활성 습관 1개.
      habits = await ctx.deps.habitDao.activeHabitsForUser(ctx.deps.userId);
      expect(habits, hasLength(1));
      expect(habits.first.frameFramedText, '아침에 햇빛 보기');

      // UI 에 모델 마무리 문구도 보인다.
      expect(find.text('아침 햇빛 습관을 추가했어요.'), findsOneWidget);
    },
  );

  testWidgets(
    'ConfirmDialog 취소 → habit DB 변화 없음, ToolCancelled 메시지',
    (tester) async {
      final ctx = await bootstrapToolDeps();
      addTearDown(() => ctx.db.close());

      final mock = MockLlmService();
      await mock.load();
      mock.enqueueChatEvents([
        const LlmFunctionCall('add_habit', {
          'protocol_id': 'morning_sunlight',
          'frame_level': 'L2',
          'framed_text': '아침에 햇빛 보기',
        }),
      ]);
      mock.enqueueChatEvents([
        const LlmTextChunk('알겠어요, 추가하지 않았어요.'),
      ]);

      await tester.pumpWidget(
        ProviderScope(
          overrides: [
            appDatabaseProvider.overrideWithValue(ctx.db),
            llmServiceProvider.overrideWithValue(mock),
            bootstrapProvider.overrideWith((ref) async {}),
            toolDepsProvider.overrideWith((ref) async => ctx.deps),
          ],
          child: const MaterialApp(home: ChatScreen()),
        ),
      );
      await tester.pumpAndSettle();

      await tester.enterText(find.byType(TextField), '추가');
      await tester.tap(find.byIcon(Icons.send));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 50));

      expect(find.text('이 작업을 수행할까요?'), findsOneWidget);
      await tester.tap(find.text('취소'));
      await tester.pumpAndSettle();

      final habits =
          await ctx.deps.habitDao.activeHabitsForUser(ctx.deps.userId);
      expect(habits, isEmpty);
      // tool call 메시지 라벨이 '취소됨' 으로 표시.
      expect(find.textContaining('취소됨'), findsOneWidget);
    },
  );
}