import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../services/auth_service.dart';
import 'register_screen.dart';
import 'forgot_password_screen.dart';

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

  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  final _formKey = GlobalKey<FormState>();
  final _usernameController = TextEditingController();
  final _passwordController = TextEditingController();
  bool _isPasswordVisible = false;
  bool _rememberMe = false;

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

  // 로그인 처리 함수
  Future<void> _login() async {
    if (_formKey.currentState!.validate()) {
      final authService = Provider.of<AuthService>(context, listen: false);
      final success = await authService.login(
        _usernameController.text.trim(),
        _passwordController.text,
      );

      if (success && mounted) {
        // 로그인 성공 시 홈 화면으로 이동
        Navigator.of(context).pushNamedAndRemoveUntil('/', (route) => false);
      } else if (!success && mounted) {
        // 로그인 실패 시 스낵바 표시
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text('로그인에 실패했습니다. 아이디와 비밀번호를 확인해주세요.'),
            backgroundColor: Colors.red,
          ),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final authService = Provider.of<AuthService>(context);

    return Scaffold(
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            padding: const EdgeInsets.all(24.0),
            child: Form(
              key: _formKey,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  // 로고 이미지
                  Column(
                    children: [
                      Image.asset(
                        'assets/images/logo.png',
                        width: 120,
                        height: 120,
                      ),
                      const SizedBox(height: 16),
                      const Text(
                        '레인보우 - 볼링 클럽 매니저',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 24,
                          fontWeight: FontWeight.bold,
                          color: Colors.blue,
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: 48),

                  // 사용자명(아이디) 입력 필드
                  TextFormField(
                    controller: _usernameController,
                    decoration: const InputDecoration(
                      labelText: '아이디',
                      prefixIcon: Icon(Icons.person),
                      border: OutlineInputBorder(),
                    ),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return '아이디를 입력해주세요';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),

                  // 비밀번호 입력 필드
                  TextFormField(
                    controller: _passwordController,
                    obscureText: !_isPasswordVisible,
                    decoration: InputDecoration(
                      labelText: '비밀번호',
                      prefixIcon: const Icon(Icons.lock),
                      border: const OutlineInputBorder(),
                      suffixIcon: IconButton(
                        icon: Icon(
                          _isPasswordVisible ? Icons.visibility : Icons.visibility_off,
                        ),
                        onPressed: () {
                          setState(() {
                            _isPasswordVisible = !_isPasswordVisible;
                          });
                        },
                      ),
                    ),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return '비밀번호를 입력해주세요';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 8),

                  // 로그인 상태 유지 체크박스
                  Row(
                    children: [
                      Checkbox(
                        value: _rememberMe,
                        onChanged: (value) {
                          setState(() {
                            _rememberMe = value ?? false;
                          });
                        },
                      ),
                      const Text('로그인 상태 유지'),
                      const Spacer(),
                      TextButton(
                        onPressed: () {
                          Navigator.push(
                            context,
                            MaterialPageRoute(
                              builder: (context) => const ForgotPasswordScreen(),
                            ),
                          );
                        },
                        child: const Text('비밀번호 찾기'),
                      ),
                    ],
                  ),
                  const SizedBox(height: 24),

                  // 로그인 버튼
                  ElevatedButton(
                    onPressed: authService.isLoading ? null : _login,
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      backgroundColor: Colors.blue,
                      foregroundColor: Colors.white,
                    ),
                    child: authService.isLoading
                        ? const SizedBox(
                            width: 20,
                            height: 20,
                            child: CircularProgressIndicator(
                              strokeWidth: 2,
                              color: Colors.white,
                            ),
                          )
                        : const Text(
                            '로그인',
                            style: TextStyle(fontSize: 16),
                          ),
                  ),
                  const SizedBox(height: 16),

                  // 회원가입 링크
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Text('계정이 없으신가요?'),
                      TextButton(
                        onPressed: () {
                          Navigator.push(
                            context,
                            MaterialPageRoute(
                              builder: (context) => const RegisterScreen(),
                            ),
                          );
                        },
                        child: const Text('회원가입'),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}