import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:integration_test/integration_test.dart';

/// E2E 用户流程测试
/// 测试完整的用户操作流程：注册 → 登录 → 创建项目 → 编辑 → 保存
void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();

  group('E2E User Flow Tests', () {
    // E2E-001: 新用户完整流程
    testWidgets('E2E-001: Complete new user flow', (tester) async {
      // TODO: 替换为实际的应用入口
      // await tester.pumpWidget(MyApp());
      
      // 模拟欢迎页面
      await tester.pumpWidget(
        const MaterialApp(
          home: Scaffold(
            body: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Mobile EDA'),
                  TextButton(
                    onPressed: null, // TODO: 实现导航
                    child: Text('注册'),
                  ),
                  TextButton(
                    onPressed: null, // TODO: 实现导航
                    child: Text('登录'),
                  ),
                ],
              ),
            ),
          ),
        ),
      );
      
      // 验证欢迎页面显示
      expect(find.text('Mobile EDA'), findsOneWidget);
      expect(find.text('注册'), findsOneWidget);
      expect(find.text('登录'), findsOneWidget);
      
      // TODO: 实现完整的 E2E 流程
      // 1. 点击注册
      // 2. 填写注册表单
      // 3. 提交注册
      // 4. 验证登录成功
      // 5. 创建项目
      // 6. 编辑项目
      // 7. 保存项目
      // 8. 验证数据持久化
    });

    // E2E-002: 老用户登录流程
    testWidgets('E2E-002: Existing user login flow', (tester) async {
      await tester.pumpWidget(
        const MaterialApp(
          home: Scaffold(
            body: Center(
              child: Column(
                children: [
                  TextField(decoration: InputDecoration(hintText: '邮箱')),
                  TextField(decoration: InputDecoration(hintText: '密码')),
                  ElevatedButton(onPressed: null, child: Text('登录')),
                ],
              ),
            ),
          ),
        ),
      );
      
      // 验证登录页面
      expect(find.text('邮箱'), findsOneWidget);
      expect(find.text('密码'), findsOneWidget);
      expect(find.text('登录'), findsOneWidget);
      
      // TODO: 实现登录流程测试
    });

    // E2E-003: 项目创建和编辑
    testWidgets('E2E-003: Project creation and editing', (tester) async {
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            appBar: AppBar(title: const Text('项目列表')),
            body: ListView(
              children: [
                ListTile(
                  title: const Text('测试项目'),
                  onTap: () {},
                ),
              ],
            ),
            floatingActionButton: FloatingActionButton(
              onPressed: () {},
              child: const Icon(Icons.add),
            ),
          ),
        ),
      );
      
      // 验证项目列表
      expect(find.text('项目列表'), findsOneWidget);
      expect(find.text('测试项目'), findsOneWidget);
      
      // TODO: 实现项目创建和编辑测试
    });

    // E2E-004: 元件放置工作流
    testWidgets('E2E-004: Component placement workflow', (tester) async {
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: Stack(
              children: [
                // 画布
                Container(
                  color: const Color(0xFFFAFAFA),
                  child: const Center(child: Text('画布区域')),
                ),
                // 工具栏
                Positioned(
                  bottom: 0,
                  left: 0,
                  right: 0,
                  child: Container(
                    color: Colors.white,
                    child: Row(
                      children: [
                        IconButton(icon: const Icon(Icons.touch_app), onPressed: () {}),
                        IconButton(icon: const Icon(Icons.edit), onPressed: () {}),
                        const Spacer(),
                        IconButton(icon: const Icon(Icons.apps), onPressed: () {}),
                      ],
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      );
      
      // 验证工具栏
      expect(find.byIcon(Icons.touch_app), findsOneWidget);
      expect(find.byIcon(Icons.edit), findsOneWidget);
      expect(find.byIcon(Icons.apps), findsOneWidget);
      
      // TODO: 实现元件放置测试
    });

    // E2E-005: 撤销重做功能
    testWidgets('E2E-005: Undo/Redo functionality', (tester) async {
      int undoCount = 0;
      int redoCount = 0;
      
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            appBar: AppBar(
              title: const Text('编辑器'),
              actions: [
                IconButton(
                  icon: const Icon(Icons.undo),
                  onPressed: () => undoCount++,
                ),
                IconButton(
                  icon: const Icon(Icons.redo),
                  onPressed: () => redoCount++,
                ),
              ],
            ),
            body: const Center(child: Text('画布')),
          ),
        ),
      );
      
      // 点击撤销
      await tester.tap(find.byIcon(Icons.undo));
      await tester.pump();
      expect(undoCount, 1);
      
      // 点击重做
      await tester.tap(find.byIcon(Icons.redo));
      await tester.pump();
      expect(redoCount, 1);
    });

    // E2E-006: 保存功能
    testWidgets('E2E-006: Save functionality', (tester) async {
      bool saveCalled = false;
      
      await tester.pumpWidget(
        MaterialApp(
          appBar: AppBar(
            title: const Text('编辑器'),
            actions: [
              IconButton(
                icon: const Icon(Icons.save),
                onPressed: () => saveCalled = true,
              ),
            ],
          ),
          home: const Scaffold(body: Center(child: Text('画布'))),
        ),
      );
      
      // 点击保存
      await tester.tap(find.byIcon(Icons.save));
      await tester.pump();
      
      // TODO: 验证保存成功（需要实现实际保存逻辑）
      expect(saveCalled, true);
    });

    // E2E-007: 深色模式切换
    testWidgets('E2E-007: Dark mode toggle', (tester) async {
      await tester.pumpWidget(
        const MaterialApp(
          theme: ThemeData(brightness: Brightness.light),
          darkTheme: ThemeData(brightness: Brightness.dark),
          themeMode: ThemeMode.light,
          home: Scaffold(
            body: Center(child: Text('测试内容')),
          ),
        ),
      );
      
      // 验证浅色模式
      expect(find.text('测试内容'), findsOneWidget);
      
      // TODO: 实现主题切换测试（需要实际的主题切换功能）
    });

    // E2E-008: 多语言切换
    testWidgets('E2E-008: Language switching', (tester) async {
      await tester.pumpWidget(
        const MaterialApp(
          locale: Locale('zh', 'CN'),
          home: Scaffold(
            appBar: AppBar(title: Text('Mobile EDA')),
            body: Center(child: Text('欢迎使用')),
          ),
        ),
      );
      
      // 验证中文显示
      expect(find.text('Mobile EDA'), findsOneWidget);
      expect(find.text('欢迎使用'), findsOneWidget);
      
      // TODO: 实现语言切换测试
    });

    // E2E-009: 断网操作
    testWidgets('E2E-009: Offline operation', (tester) async {
      // 模拟断网场景
      bool offlineMode = true;
      
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            appBar: AppBar(
              title: const Text('编辑器'),
              actions: [
                IconButton(
                  icon: const Icon(Icons.save),
                  onPressed: offlineMode
                      ? () {
                          // 断网时保存到本地
                        }
                      : null,
                ),
              ],
            ),
            body: const Center(child: Text('画布')),
          ),
        ),
      );
      
      // 验证断网时保存按钮可用（本地保存）
      expect(find.byIcon(Icons.save), findsOneWidget);
      
      // TODO: 实现完整的断网操作测试
    });

    // E2E-010: 错误处理
    testWidgets('E2E-010: Error handling', (tester) async {
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: Center(
              child: ElevatedButton(
                onPressed: () {
                  // 模拟错误
                  throw Exception('测试错误');
                },
                child: const Text('触发错误'),
              ),
            ),
          ),
        ),
      );
      
      // 验证错误按钮存在
      expect(find.text('触发错误'), findsOneWidget);
      
      // TODO: 实现错误处理测试（需要错误边界）
    });
  });

  group('E2E Performance Tests', () {
    // E2E-PERF-001: 大量元件渲染
    testWidgets('E2E-PERF-001: Large component rendering', (tester) async {
      const componentCount = 1000;
      
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: GridView.builder(
              gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 10,
              ),
              itemCount: componentCount,
              itemBuilder: (context, index) {
                return Card(
                  child: Center(child: Text('元件 $index')),
                );
              },
            ),
          ),
        ),
      );
      
      // 验证所有元件渲染
      expect(find.textContaining('元件'), findsNWidgets(componentCount));
      
      // TODO: 添加性能断言（帧率、内存等）
    });

    // E2E-PERF-002: 快速交互
    testWidgets('E2E-PERF-002: Rapid interaction', (tester) async {
      int tapCount = 0;
      
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: Center(
              child: ElevatedButton(
                onPressed: () => tapCount++,
                child: const Text('点击'),
              ),
            ),
          ),
        ),
      );
      
      // 快速点击 10 次
      for (int i = 0; i < 10; i++) {
        await tester.tap(find.text('点击'));
      }
      await tester.pumpAndSettle();
      
      expect(tapCount, 10);
    });
  });
}