# 注册验证码流程 UX 优化实现计划

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** 优化注册流程的界面响应速度和重发验证码按钮的交互体验

**Architecture:** 乐观跳转策略 + Timer 倒计时状态管理，后台异步发送验证码

**Tech Stack:** Flutter, dart:async Timer, flutter_bloc

---

## Task 1: 扩展 RegisterCubit 状态

**Files:**
- Modify: `apps/lib/features/auth/presentation/cubits/register_cubit.dart`
- Modify: `apps/test/features/auth/presentation/cubits/register_cubit_test.dart`

**Step 1: 添加 isSending 状态字段**

在 `RegisterState` 中添加 `isSending` 字段：

```dart
// RegisterState
final bool isSending;

const RegisterState({
  // ... existing fields
  this.isSending = false,
});

// copyWith
bool? isSending,

// copyWith return
isSending: isSending ?? this.isSending,

// props
isSending,
```

**Step 2: 添加 sendCodeSilently 方法**

在 `RegisterCubit` 中添加不阻塞的发送方法：

```dart
Future<void> sendCodeSilently() async {
  if (!state.isStep1Valid) return;

  emit(state.copyWith(isSending: true));

  try {
    final response = await _repository.signupStart(
      SignupStartRequest(
        username: state.username.value,
        email: state.email.value,
        password: state.password.value,
      ),
    );
    emit(
      state.copyWith(
        isSending: false,
        pendingEmail: response.email,
        codeSent: true,
        errorMessage: null,
      ),
    );
  } catch (e) {
    final message = e is ApiException ? e.message : '验证码发送失败，请重试';
    emit(
      state.copyWith(
        isSending: false,
        errorMessage: message,
      ),
    );
  }
}
```

**Step 3: 添加测试**

```dart
// 在 register_cubit_test.dart 添加

group('sendCodeSilently', () {
  blocTest<RegisterCubit, RegisterState>(
    'sets isSending to true then false on success',
    build: () => cubit,
    seed: () => RegisterState(
      username: const Username.dirty('testuser'),
      email: const Email.dirty('test@example.com'),
      password: const Password.dirty('password123'),
    ),
    setUp: () {
      when(() => mockRepository.signupStart(any()))
          .thenAnswer((_) async => SignupStartResponse(email: 'test@example.com'));
    },
    act: (c) => c.sendCodeSilently(),
    verify: (_) {
      verify(() => mockRepository.signupStart(any())).called(1);
    },
  );
});
```

**Step 4: 运行测试**

Run: `cd apps && flutter test test/features/auth/presentation/cubits/register_cubit_test.dart`
Expected: PASS

**Step 5: Commit**

```bash
git add apps/lib/features/auth/presentation/cubits/register_cubit.dart apps/test/features/auth/presentation/cubits/register_cubit_test.dart
git commit -m "feat(auth): add sendCodeSilently with isSending state"
```

---

## Task 2: 实现乐观跳转

**Files:**
- Modify: `apps/lib/features/auth/ui/screens/register_screen.dart`

**Step 1: 修改 _handleNext 方法**

将同步等待改为乐观跳转：

```dart
Future<void> _handleNext() async {
  final cubit = context.read<RegisterCubit>();
  cubit.usernameChanged(_nicknameController.text);
  cubit.emailChanged(_emailController.text);
  cubit.passwordChanged(_passwordController.text);

  if (!cubit.state.isStep1Valid) {
    return;
  }

  // 乐观跳转：立即跳转到验证码界面
  if (mounted) {
    context.push('/register/verification', extra: cubit);
  }

  // 后台发送验证码
  cubit.sendCodeSilently();
}
```

**Step 2: Commit**

```bash
git add apps/lib/features/auth/ui/screens/register_screen.dart
git commit -m "feat(auth): optimistic navigation to verification screen"
```

---

## Task 3: 实现倒计时状态管理

**Files:**
- Modify: `apps/lib/features/auth/ui/screens/register_verification_screen.dart`

**Step 1: 添加 Timer 状态**

在 `_RegisterVerificationViewState` 中添加：

```dart
import 'dart:async';

// 状态变量
Timer? _countdownTimer;
int _countdown = 60;

@override
void initState() {
  super.initState();
  _startCountdown();
}

@override
void dispose() {
  _countdownTimer?.cancel();
  _codeController.dispose();
  super.dispose();
}

void _startCountdown() {
  setState(() {
    _countdown = 60;
  });
  _countdownTimer?.cancel();
  _countdownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
    if (_countdown > 0) {
      setState(() {
        _countdown--;
      });
    } else {
      timer.cancel();
    }
  });
}
```

**Step 2: Commit**

```bash
git add apps/lib/features/auth/ui/screens/register_verification_screen.dart
git commit -m "feat(auth): add countdown timer for resend button"
```

---

## Task 4: 优化重发按钮样式

**Files:**
- Modify: `apps/lib/features/auth/ui/screens/register_verification_screen.dart`

**Step 1: 重构 _buildCodeInput 方法**

替换重发按钮部分：

```dart
Widget _buildCodeInput(RegisterState state) {
  final canResend = _countdown == 0 && state.status != FormzSubmissionStatus.inProgress;

  return Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: [
      const Text(
        '邮箱验证码',
        style: TextStyle(
          fontSize: 13,
          fontWeight: FontWeight.w500,
          color: Color(0xFF475569),
        ),
      ),
      const SizedBox(height: 6),
      Row(
        children: [
          Expanded(
            child: SizedBox(
              height: 40,
              child: TextField(
                controller: _codeController,
                keyboardType: TextInputType.number,
                decoration: const InputDecoration(
                  hintText: '输入验证码',
                  contentPadding: EdgeInsets.symmetric(
                    horizontal: 12,
                    vertical: 10,
                  ),
                ),
              ),
            ),
          ),
          const SizedBox(width: 8),
          _buildResendButton(canResend),
        ],
      ),
    ],
  );
}

Widget _buildResendButton(bool canResend) {
  final borderColor = canResend ? AppColors.primary : AppColors.slate300;
  final textColor = canResend ? AppColors.primary : AppColors.slate400;
  final text = canResend ? '重新发送' : '$_countdown s';

  return SizedBox(
    width: 90,
    height: 40,
    child: OutlinedButton(
      onPressed: canResend ? _handleResendCode : null,
      style: OutlinedButton.styleFrom(
        backgroundColor: AppColors.background,
        side: BorderSide(color: borderColor),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
      ),
      child: Text(
        text,
        style: TextStyle(
          fontSize: 13,
          fontWeight: FontWeight.w500,
          color: textColor,
        ),
      ),
    ),
  );
}
```

**Step 2: Commit**

```bash
git add apps/lib/features/auth/ui/screens/register_verification_screen.dart
git commit -m "feat(auth): improve resend button style with countdown"
```

---

## Task 5: 添加 Toast 错误提示

**Files:**
- Modify: `apps/lib/features/auth/ui/screens/register_verification_screen.dart`

**Step 1: 添加 BlocListener 监听错误**

用 `BlocConsumer` 替换 `BlocBuilder`，添加监听：

```dart
import '../../../../shared/widgets/toast/toast.dart';

Widget _buildFormContainer() {
  return BlocConsumer<RegisterCubit, RegisterState>(
    listener: (context, state) {
      // 监听后台发送验证码的错误
      if (state.errorMessage != null && !state.isStep2Valid) {
        Toast.show(context, state.errorMessage!, type: ToastType.error);
      }
    },
    builder: (context, state) {
      return SizedBox(
        width: 327,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            _buildCodeInput(state),
            const SizedBox(height: 12),
            _buildStepIndicator(),
            const SizedBox(height: 12),
            AppButton(
              text: '完成注册',
              onPressed: state.status == FormzSubmissionStatus.inProgress
                  ? null
                  : _handleComplete,
            ),
          ],
        ),
      );
    },
  );
}
```

**Step 2: 修改 _handleResendCode 重置倒计时**

```dart
Future<void> _handleResendCode() async {
  final cubit = context.read<RegisterCubit>();
  await cubit.resendCode();
  
  // 重发成功后重置倒计时
  if (cubit.state.codeSent && mounted) {
    _startCountdown();
    Toast.show(context, '验证码已发送', type: ToastType.success);
  }
}
```

**Step 3: Commit**

```bash
git add apps/lib/features/auth/ui/screens/register_verification_screen.dart
git commit -m "feat(auth): add toast feedback for code sending"
```

---

## Task 6: 集成测试与验收

**Step 1: 运行全部测试**

Run: `cd apps && flutter test`
Expected: All tests PASS

**Step 2: 手动验收清单**

- [ ] 点击"下一步"后立即跳转到验证码界面
- [ ] 验证码界面显示倒计时按钮 "60 s" ... "1 s"
- [ ] 倒计时期间按钮禁用
- [ ] 倒计时结束后显示"重新发送"，可点击
- [ ] 点击重发后重新开始 60 秒倒计时
- [ ] 发送失败时 Toast 提示错误

**Step 3: Final commit**

```bash
git add -A
git commit -m "feat(auth): complete register verification UX optimization"
```

---

## 文件变更汇总

| 文件 | 变更 |
|------|------|
| `register_cubit.dart` | 添加 `isSending` 状态、`sendCodeSilently` 方法 |
| `register_screen.dart` | 乐观跳转，后台发送 |
| `register_verification_screen.dart` | Timer 倒计时、按钮样式、Toast 提示 |
| `register_cubit_test.dart` | 新增 `sendCodeSilently` 测试 |
