import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:get_it/get_it.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:provider/provider.dart';

/// 테스트용 GetIt 인스턴스 초기화
GetIt setupTestGetIt() {
  final getIt = GetIt.instance;
  
  // 기존 등록된 서비스들 모두 제거
  getIt.reset();
  
  return getIt;
}

/// 테스트용 위젯 래퍼
/// 모든 위젯 테스트에서 필요한 기본 설정을 제공
class TestWidgetWrapper extends StatelessWidget {
  final Widget child;
  final List<ChangeNotifierProvider>? providers;
  final NavigatorObserver? navigatorObserver;
  final Map<String, WidgetBuilder>? routes;
  final String? initialRoute;

  const TestWidgetWrapper({
    Key? key,
    required this.child,
    this.providers,
    this.navigatorObserver,
    this.routes,
    this.initialRoute,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    Widget wrappedChild = MaterialApp(
      title: 'Test App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      localizationsDelegates: const [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: const [
        Locale('ko', 'KR'),
        Locale('en', 'US'),
      ],
      home: Scaffold(body: child),
      routes: routes ?? {},
      initialRoute: initialRoute,
      navigatorObservers: navigatorObserver != null ? [navigatorObserver!] : [],
    );

    // Provider가 있는 경우 래핑
    if (providers != null && providers!.isNotEmpty) {
      return MultiProvider(
        providers: providers!,
        child: wrappedChild,
      );
    }

    return wrappedChild;
  }
}

/// 위젯을 테스트 환경에서 펌프하는 헬퍼 함수
Future<void> pumpTestWidget(
  WidgetTester tester,
  Widget widget, {
  List<ChangeNotifierProvider>? providers,
  NavigatorObserver? navigatorObserver,
  Map<String, WidgetBuilder>? routes,
  String? initialRoute,
}) async {
  await tester.pumpWidget(
    TestWidgetWrapper(
      child: widget,
      providers: providers,
      navigatorObserver: navigatorObserver,
      routes: routes,
      initialRoute: initialRoute,
    ),
  );
}

/// 비동기 작업을 기다리고 위젯을 리빌드하는 헬퍼
Future<void> pumpAndSettleWithTimeout(
  WidgetTester tester, {
  Duration timeout = const Duration(seconds: 10),
}) async {
  await tester.pump();
  await tester.pumpAndSettle(timeout);
}

/// TextField에 텍스트를 입력하는 헬퍼
Future<void> enterTextByLabel(
  WidgetTester tester,
  String label,
  String text,
) async {
  final textFieldFinder = find.ancestor(
    of: find.text(label),
    matching: find.byType(TextFormField),
  );
  
  if (textFieldFinder.evaluate().isEmpty) {
    // 라벨로 찾지 못한 경우, 가까운 TextFormField 찾기
    final labelWidget = find.text(label);
    final textField = find.byType(TextFormField).first;
    await tester.enterText(textField, text);
  } else {
    await tester.enterText(textFieldFinder, text);
  }
}

/// 버튼을 찾고 탭하는 헬퍼
Future<void> tapButtonByText(
  WidgetTester tester,
  String buttonText,
) async {
  final buttonFinder = find.widgetWithText(ElevatedButton, buttonText);
  
  if (buttonFinder.evaluate().isEmpty) {
    // ElevatedButton이 아닌 경우 다른 버튼 타입 시도
    final textButtonFinder = find.widgetWithText(TextButton, buttonText);
    if (textButtonFinder.evaluate().isNotEmpty) {
      await tester.tap(textButtonFinder);
      return;
    }
    
    final outlinedButtonFinder = find.widgetWithText(OutlinedButton, buttonText);
    if (outlinedButtonFinder.evaluate().isNotEmpty) {
      await tester.tap(outlinedButtonFinder);
      return;
    }
    
    // 아무 버튼도 찾지 못한 경우 텍스트만으로 시도
    await tester.tap(find.text(buttonText));
  } else {
    await tester.tap(buttonFinder);
  }
}

/// 스낵바 메시지 검증 헬퍼
void expectSnackBar(WidgetTester tester, String message) {
  expect(
    find.descendant(
      of: find.byType(SnackBar),
      matching: find.text(message),
    ),
    findsOneWidget,
  );
}

/// 로딩 인디케이터 검증 헬퍼
void expectLoading(WidgetTester tester, {bool isLoading = true}) {
  expect(
    find.byType(CircularProgressIndicator),
    isLoading ? findsOneWidget : findsNothing,
  );
}

/// 에러 메시지 검증 헬퍼
void expectErrorMessage(WidgetTester tester, String errorMessage) {
  expect(find.text(errorMessage), findsOneWidget);
}

/// 화면 전환 대기 헬퍼
Future<void> waitForNavigation(WidgetTester tester) async {
  await tester.pump();
  await tester.pump(const Duration(milliseconds: 300)); // 애니메이션 대기
}

/// 다이얼로그 검증 헬퍼
void expectDialog(WidgetTester tester, {String? title, String? content}) {
  expect(find.byType(Dialog), findsOneWidget);
  
  if (title != null) {
    expect(
      find.descendant(
        of: find.byType(Dialog),
        matching: find.text(title),
      ),
      findsOneWidget,
    );
  }
  
  if (content != null) {
    expect(
      find.descendant(
        of: find.byType(Dialog),
        matching: find.text(content),
      ),
      findsOneWidget,
    );
  }
}

/// 다이얼로그 닫기 헬퍼
Future<void> closeDialog(WidgetTester tester) async {
  // 다이얼로그 외부 탭하여 닫기
  await tester.tapAt(const Offset(10, 10));
  await tester.pump();
}

/// 스크롤하여 위젯 찾기 헬퍼
Future<void> scrollUntilVisible(
  WidgetTester tester,
  Finder finder, {
  double delta = 300,
  int maxScrolls = 10,
  Finder? scrollable,
}) async {
  final scrollableFinder = scrollable ?? find.byType(Scrollable).first;
  
  for (int i = 0; i < maxScrolls; i++) {
    if (finder.evaluate().isNotEmpty) {
      return;
    }
    
    await tester.drag(scrollableFinder, Offset(0, -delta));
    await tester.pump();
  }
}

/// 테이블이나 리스트에서 특정 행 찾기 헬퍼
Finder findRowContaining(String text) {
  return find.ancestor(
    of: find.text(text),
    matching: find.byType(Row),
  );
}

/// 폼 필드 검증 헬퍼
void expectFormFieldError(WidgetTester tester, String fieldLabel, String errorText) {
  final formField = find.ancestor(
    of: find.text(fieldLabel),
    matching: find.byType(TextFormField),
  );
  
  final errorFinder = find.descendant(
    of: formField,
    matching: find.text(errorText),
  );
  
  expect(errorFinder, findsOneWidget);
}

/// 드롭다운 선택 헬퍼
Future<void> selectDropdownItem(
  WidgetTester tester,
  String dropdownLabel,
  String itemText,
) async {
  // 드롭다운 찾기
  final dropdown = find.ancestor(
    of: find.text(dropdownLabel),
    matching: find.byType(DropdownButtonFormField),
  );
  
  // 드롭다운 열기
  await tester.tap(dropdown);
  await tester.pump();
  
  // 아이템 선택
  await tester.tap(find.text(itemText).last);
  await tester.pump();
}

/// 날짜 선택 헬퍼
Future<void> selectDate(
  WidgetTester tester,
  String dateFieldLabel,
  DateTime date,
) async {
  // 날짜 필드 탭
  final dateField = find.ancestor(
    of: find.text(dateFieldLabel),
    matching: find.byType(TextFormField),
  );
  
  await tester.tap(dateField);
  await tester.pump();
  
  // 날짜 선택 (간단한 구현, 실제로는 더 복잡할 수 있음)
  await tester.tap(find.text(date.day.toString()));
  await tester.pump();
  
  // 확인 버튼 탭
  await tester.tap(find.text('확인'));
  await tester.pump();
}