import 'package:flutter/material.dart';
import 'main.dart';
import 'register_screen.dart';

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

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

class _LoginScreenState extends State<LoginScreen> {
  final TextEditingController _idController = TextEditingController();
  final TextEditingController _pwController = TextEditingController();

  final FocusNode _idFocusNode = FocusNode();
  final FocusNode _pwFocusNode = FocusNode();

  final Color mainBlueColor = const Color(0xFF0033CC);

  bool _isIdFocused = false;
  bool _isPwFocused = false;

  @override
  void initState() {
    super.initState();
    _idFocusNode.addListener(() {
      setState(() => _isIdFocused = _idFocusNode.hasFocus);
    });
    _pwFocusNode.addListener(() {
      setState(() => _isPwFocused = _pwFocusNode.hasFocus);
    });
  }

  @override
  void dispose() {
    _idController.dispose();
    _pwController.dispose();
    _idFocusNode.dispose();
    _pwFocusNode.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: SafeArea(
        child: Center(
          child: SingleChildScrollView(
            child: Padding(
              padding: const EdgeInsets.all(24.0),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  Image.asset(
                    'assets/images/metaq_v.png',
                    width: 86,
                    height: 86,
                    fit: BoxFit.contain,
                  ),
                  const SizedBox(height: 70),
                  _buildCustomTextField(
                    label: '아이디',
                    controller: _idController,
                    focusNode: _idFocusNode,
                    isFocused: _isIdFocused,
                  ),
                  const SizedBox(height: 16),
                  _buildCustomTextField(
                    label: '비밀번호',
                    controller: _pwController,
                    focusNode: _pwFocusNode,
                    isFocused: _isPwFocused,
                    isObscure: true,
                  ),
                  const SizedBox(height: 40),
                  ElevatedButton(
                    onPressed: () {
                      String inputId = _idController.text;
                      String inputPw = _pwController.text;

                      if (inputId == 'user' && inputPw == '1234') {
                        Navigator.pushReplacement(
                          context,
                          MaterialPageRoute(
                              builder: (context) => const HomeScreen()),
                        );
                      } else {
                        ScaffoldMessenger.of(context).showSnackBar(
                          const SnackBar(
                            content: Text('아이디 또는 비밀번호가 틀렸습니다.'),
                            backgroundColor: Colors.redAccent,
                            duration: Duration(seconds: 2),
                          ),
                        );
                      }
                    },
                    style: ElevatedButton.styleFrom(
                      backgroundColor: mainBlueColor,
                      foregroundColor: Colors.white,
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      elevation: 0,
                    ),
                    child: const Text(
                      '로그인',
                      style:
                      TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                    ),
                  ),
                  const SizedBox(height: 12),

                  ElevatedButton(
                    onPressed: () {
                      Navigator.push(
                        context,
                        MaterialPageRoute(
                            builder: (context) => const RegisterScreen()),
                      );
                    },
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.white,
                      foregroundColor: mainBlueColor,
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      side: BorderSide(color: mainBlueColor, width: 1.0),
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(12),
                      ),
                      elevation: 0,
                    ),
                    child: const Text(
                      '회원가입',
                      style:
                      TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildCustomTextField({
    required String label,
    required TextEditingController controller,
    required FocusNode focusNode,
    required bool isFocused,
    bool isObscure = false,
  }) {
    return AnimatedContainer(
      duration: const Duration(milliseconds: 200),
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
      decoration: BoxDecoration(
        color: Colors.white,
        border: Border.all(
          color: isFocused ? mainBlueColor : Colors.grey.shade300,
          width: isFocused ? 1.5 : 1.0,
        ),
        borderRadius: BorderRadius.circular(8),
      ),
      child: TextField(
        controller: controller,
        focusNode: focusNode,
        obscureText: isObscure,
        decoration : InputDecoration(
          hintText: label,
          hintStyle: TextStyle(
            color: Colors.grey.shade400,
            fontSize: 16,
          ),
          isDense: true,
          contentPadding: EdgeInsets.zero,
          border: InputBorder.none,
          focusedBorder: InputBorder.none,
          enabledBorder: InputBorder.none,
        ),
        style: const TextStyle(
          fontSize: 16,
          color: Colors.black87,
        ),
        cursorColor: mainBlueColor,
      ),
    );
  }
}