flutter_app_android/lib/presentation/screens/auth/login_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../providers/auth_provider.dart';
import '../../../core/constants/route_constants.dart';
import '../../widgets/common/app_button.dart';
import '../../widgets/common/app_text_field.dart';
import '../../widgets/common/loading_indicator.dart';

class LoginScreen extends StatefulWidget {
  final VoidCallback? onSuccess;
  
  const LoginScreen({super.key, this.onSuccess});
  
  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _emailController = TextEditingController(text: 'test@example.com');
  final _passwordController = TextEditingController(text: '123456');
  
  @override
  void dispose() {
    _emailController.dispose();
    _passwordController.dispose();
    super.dispose();
  }
  
  @override
  Widget build(BuildContext context) {
    final authProvider = Provider.of<AuthProvider>(context);
    
    return Scaffold(
      appBar: AppBar(
        title: const Text('登录'),
      ),
      body: SingleChildScrollView(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const SizedBox(height: 40),
                const Center(
                  child: Text(
                    '欢迎回来',
                    style: TextStyle(
                      fontSize: 28,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                const SizedBox(height: 8),
                const Center(
                  child: Text(
                    '请输入您的账号信息',
                    style: TextStyle(
                      fontSize: 16,
                      color: Colors.grey,
                    ),
                  ),
                ),
                const SizedBox(height: 40),
                AppTextField(
                  controller: _emailController,
                  labelText: '邮箱地址',
                  hintText: '请输入邮箱',
                  keyboardType: TextInputType.emailAddress,
                  prefixIcon: const Icon(Icons.email_outlined),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return '请输入邮箱地址';
                    }
                    if (!value.contains('@')) {
                      return '请输入有效的邮箱地址';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 20),
                AppTextField(
                  controller: _passwordController,
                  labelText: '密码',
                  hintText: '请输入密码',
                  obscureText: true,
                  prefixIcon: const Icon(Icons.lock_outline),
                  validator: (value) {
                    if (value == null || value.isEmpty) {
                      return '请输入密码';
                    }
                    if (value.length < 6) {
                      return '密码至少需要6位字符';
                    }
                    return null;
                  },
                ),
                const SizedBox(height: 30),
                if (authProvider.error != null)
                  Padding(
                    padding: const EdgeInsets.only(bottom: 16),
                    child: Text(
                      authProvider.error!,
                      style: const TextStyle(
                        color: Colors.red,
                        fontSize: 14,
                      ),
                    ),
                  ),
                if (authProvider.isLoading)
                  const LoadingIndicator()
                else
                  AppButton(
                    text: '登录',
                    onPressed: () async {
                      if (_formKey.currentState!.validate()) {
                        await authProvider.login(
                          _emailController.text.trim(),
                          _passwordController.text,
                        );
                        if (authProvider.isAuthenticated) {
                          widget.onSuccess?.call();
                          Navigator.of(context).pushReplacementNamed(RouteConstants.home);
                        }
                      }
                    },
                  ),
                const SizedBox(height: 20),
                Center(
                  child: TextButton(
                    onPressed: () {
                      Navigator.of(context).pushNamed(RouteConstants.register);
                    },
                    child: const Text(
                      '还没有账号？立即注册',
                      style: TextStyle(
                        fontSize: 14,
                        color: Colors.blue,
                      ),
                    ),
                  ),
                ),
                const SizedBox(height: 30),
                const Row(
                  children: [
                    Expanded(child: Divider()),
                    Padding(
                      padding: EdgeInsets.symmetric(horizontal: 16),
                      child: Text('或'),
                    ),
                    Expanded(child: Divider()),
                  ],
                ),
                const SizedBox(height: 20),
                Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    IconButton(
                      onPressed: () {},
                      icon: Container(
                        padding: const EdgeInsets.all(10),
                        decoration: BoxDecoration(
                          color: Colors.grey[100],
                          borderRadius: BorderRadius.circular(50),
                        ),
                        child: const Icon(Icons.wechat, color: Colors.green),
                      ),
                    ),
                    IconButton(
                      onPressed: () {},
                      icon: Container(
                        padding: const EdgeInsets.all(10),
                        decoration: BoxDecoration(
                          color: Colors.grey[100],
                          borderRadius: BorderRadius.circular(50),
                        ),
                        child: const Icon(Icons.wechat, color: Colors.blue),
                      ),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}