import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'dart:convert' show utf8;
import 'package:crypto/crypto.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'id_finding_page.dart';
import 'pw_finding_page.dart';
import 'signup_page.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({Key? key}) : super(key: key);

  @override
  _LoginPageState createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final TextEditingController idController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();
  bool autoLogin = false;
  String loginErrorMessage = '';

  Future<void> _login() async {
    String id = idController.text;
    String password = passwordController.text;
    String autoLoginStatus = autoLogin ? 'Y' : 'N';

    var bytes = utf8.encode(password);
    var digest = sha256.convert(bytes);

    try {
      final response = await http.post(
        Uri.parse('https://eldsoft.com:8097/user/login'),
        headers: {
          'Content-Type': 'application/json',
        },
        body: jsonEncode({
          'user_id': id,
          'user_pw': digest.toString(),
        }),
      ).timeout(const Duration(seconds: 10));

      String responseBody = utf8.decode(response.bodyBytes);

      if (response.statusCode == 200) {
        final Map<String, dynamic> jsonResponse = jsonDecode(responseBody);
        
        if (jsonResponse['result'] == 'OK') {
          print('로그인 성공');
          SharedPreferences prefs = await SharedPreferences.getInstance();
          await prefs.setString('auth_token', jsonResponse['auth']['token']);
          await prefs.setBool('auto_login', autoLogin);
        } else if (jsonResponse['response_info']['msg_title'] == '로그인 실패') {
          setState(() {
            loginErrorMessage = '회원정보를 다시 확인해주세요.';
          });
        }
      } else {
        _showDialog('오류', '로그인에 실패했습니다. 관리자에게 문의해주세요.');
      }
    } catch (e) {
      _showDialog('오류', '요청이 실패했습니다. 관리자에게 문의해주세요.');
    }
  }

  void _showDialog(String title, String content) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          backgroundColor: Colors.white,
          title: Text(title, style: const TextStyle(color: Colors.black)),
          content: Text(content, style: const TextStyle(color: Colors.black)),
          actions: <Widget>[
            Center(
              child: TextButton(
                style: TextButton.styleFrom(
                  backgroundColor: Colors.black,
                  foregroundColor: Colors.white,
                ),
                child: const Text('확인'),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: const Text('ALL SCORE', style: TextStyle(color: Colors.white)),
        backgroundColor: Colors.black,
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              '로그인',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
                color: Colors.black,
              ),
            ),
            const SizedBox(height: 32),
            TextField(
              controller: idController,
              decoration: InputDecoration(
                labelText: 'ID',
                labelStyle: const TextStyle(color: Colors.black),
                border: OutlineInputBorder(),
                focusedBorder: OutlineInputBorder(
                  borderSide: const BorderSide(color: Colors.black, width: 2.0),
                ),
              ),
            ),
            const SizedBox(height: 16),
            TextField(
              controller: passwordController,
              obscureText: true,
              decoration: InputDecoration(
                labelText: 'PW',
                labelStyle: const TextStyle(color: Colors.black),
                border: OutlineInputBorder(),
                focusedBorder: OutlineInputBorder(
                  borderSide: const BorderSide(color: Colors.black, width: 2.0),
                ),
              ),
            ),
            if (loginErrorMessage.isNotEmpty)
              Padding(
                padding: const EdgeInsets.only(top: 8.0),
                child: Text(
                  loginErrorMessage,
                  style: const TextStyle(color: Colors.red),
                ),
              ),
            Row(
              mainAxisAlignment: MainAxisAlignment.start,
              children: [
                Checkbox(
                  value: autoLogin,
                  onChanged: (bool? value) {
                    setState(() {
                      autoLogin = value ?? false;
                    });
                  },
                ),
                const Text('자동로그인', style: TextStyle(color: Colors.black)),
              ],
            ),
            const SizedBox(height: 16),
            ElevatedButton(
              onPressed: _login,
              style: ElevatedButton.styleFrom(
                backgroundColor: Colors.black,
                foregroundColor: Colors.white,
              ),
              child: const Text('로그인'),
            ),
            const SizedBox(height: 16),
            TextButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const IdFindingPage()),
                );
              },
              child: const Text('ID 찾기', style: TextStyle(color: Colors.black)),
            ),
            TextButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const PwFindingPage()),
                );
              },
              child: const Text('PW 찾기', style: TextStyle(color: Colors.black)),
            ),
            TextButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const SignUpPage()),
                );
              },
              child: const Text('회원가입', style: TextStyle(color: Colors.black)),
            ),
          ],
        ),
      ),
    );
  }
}