water-management-system/lib/pages/login/login_page.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:water_management_system/services/auth_service.dart';
import 'package:water_management_system/utils/constants.dart';
import 'package:water_management_system/widgets/custom_button.dart';
import 'package:water_management_system/widgets/custom_text_field.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _obscurePassword = true;

  @override
  void dispose() {
    _usernameController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Consumer<AuthService>(
        builder: (context, authService, child) {
          return SafeArea(
            child: SingleChildScrollView(
              child: Padding(
                padding: const EdgeInsets.all(24.0),
                child: Form(
                  key: _formKey,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      SizedBox(height: 60),
                      
                      // Logo
                      Icon(
                        Icons.water_drop,
                        size: 80,
                        color: AppConstants.primaryColor,
                      ),
                      
                      SizedBox(height: 24),
                      
                      // 标题
                      Text(
                        '智慧水务管理系统',
                        style: TextStyle(
                          fontSize: 24,
                          fontWeight: FontWeight.bold,
                          color: Colors.black87,
                        ),
                        textAlign: TextAlign.center,
                      ),
                      
                      SizedBox(height: 8),
                      
                      Text(
                        '统一移动端平台',
                        style: TextStyle(
                          fontSize: 16,
                          color: Colors.grey[600],
                        ),
                        textAlign: TextAlign.center,
                      ),
                      
                      SizedBox(height: 48),
                      
                      // 用户名输入框
                      CustomTextField(
                        controller: _usernameController,
                        labelText: '用户名',
                        prefixIcon: Icons.person,
                        validator: (value) {
                          if (value == null || value.trim().isEmpty) {
                            return '请输入用户名';
                          }
                          return null;
                        },
                      ),
                      
                      SizedBox(height: 16),
                      
                      // 密码输入框
                      CustomTextField(
                        controller: _passwordController,
                        labelText: '密码',
                        prefixIcon: Icons.lock,
                        obscureText: _obscurePassword,
                        suffixIcon: IconButton(
                          icon: Icon(
                            _obscurePassword ? Icons.visibility : Icons.visibility_off,
                          ),
                          onPressed: () {
                            setState(() {
                              _obscurePassword = !_obscurePassword;
                            });
                          },
                        ),
                        validator: (value) {
                          if (value == null || value.trim().isEmpty) {
                            return '请输入密码';
                          }
                          if (value.length < 6) {
                            return '密码至少6位';
                          }
                          return null;
                        },
                      ),
                      
                      SizedBox(height: 32),
                      
                      // 登录按钮
                      authService.isLoading
                        ? const Center(
                            child: CircularProgressIndicator(),
                          )
                        : CustomButton(
                            text: '登录',
                            onPressed: _handleLogin,
                          ),
                      
                      SizedBox(height: 16),
                      
                      // 其他选项
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          TextButton(
                            onPressed: () {
                              // 忘记密码逻辑
                            },
                            child: Text(
                              '忘记密码？',
                              style: TextStyle(color: AppConstants.primaryColor),
                            ),
                          ),
                          TextButton(
                            onPressed: () {
                              // 注册逻辑
                            },
                            child: Text(
                              '注册账号',
                              style: TextStyle(color: AppConstants.primaryColor),
                            ),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
              ),
            ),
          );
        },
      ),
    );
  }

  Future<void> _handleLogin() async {
    if (!_formKey.currentState!.validate()) {
      return;
    }

    final authService = Provider.of<AuthService>(context, listen: false);
    
    final success = await authService.login(
      _usernameController.text.trim(),
      _passwordController.text,
    );

    if (success && mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('欢迎回来，${authService.userName}！'),
          backgroundColor: Colors.green,
        ),
      );
      // 登录成功后会自动跳转到主页
    } else if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: const Text('登录失败，请检查用户名和密码'),
          backgroundColor: Colors.red,
        ),
      );
    }
  }
}