import 'dart:io';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:playwith_core/playwith_core.dart';
import 'lobby_screen.dart';
import 'screens/settings_screen.dart';

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

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

class _LoginScreenState extends State<LoginScreen> {
  final _nicknameController = TextEditingController();
  final _settings = SettingsNotifier();

  @override
  void initState() {
    super.initState();
    // 저장된 닉네임 반영
    Future.delayed(const Duration(milliseconds: 100), () {
      if (mounted && _settings.nickname.isNotEmpty) {
        setState(() {
          _nicknameController.text = _settings.nickname;
        });
      }
    });
    _settings.addListener(_syncSettings);
  }

  @override
  void dispose() {
    _settings.removeListener(_syncSettings);
    _nicknameController.dispose();
    super.dispose();
  }

  void _syncSettings() {
    if (_nicknameController.text != _settings.nickname) {
      if (mounted) {
        setState(() {
          _nicknameController.text = _settings.nickname;
        });
      }
    }
    if (mounted) setState(() {});
  }

  Future<void> _enterLobby() async {
    final inputNick = _nicknameController.text.trim();
    if (inputNick.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("닉네임을 입력해주세요.")));
      return;
    }

    // 안드로이드 권한 체크
    if (Platform.isAndroid) {
      Map<Permission, PermissionStatus> statuses = await [
        Permission.location,
        Permission.nearbyWifiDevices,
      ].request();
      
      bool isNearby = statuses[Permission.nearbyWifiDevices]?.isGranted ?? false;
      bool isLocation = statuses[Permission.location]?.isGranted ?? false;
      if (!isNearby && !isLocation) {
        if (!mounted) return;
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("⚠️ 권한 허용이 필요합니다.")));
      }
    }

    // 변경 사항 저장
    if (inputNick != _settings.nickname) {
      await _settings.setProfile(inputNick, _settings.avatarIndex);
    }
    
    // [수정] 초기화 시 닉네임과 이미지를 함께 전달
    NetworkManager().initialize(
      nickname: _settings.nickname,
      profileImage: _settings.profileImageBase64, // [추가]
    );

    if (!mounted) return;
    Navigator.push(context, MaterialPageRoute(builder: (_) => const LobbyScreen()));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        actions: [
          IconButton(
            icon: const Icon(Icons.settings, color: Colors.grey),
            tooltip: "설정",
            onPressed: () => Navigator.push(context, MaterialPageRoute(builder: (_) => const SettingsScreen())),
          )
        ],
      ),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(32.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Text('PlayWith', style: TextStyle(fontSize: 40, fontWeight: FontWeight.bold)),
              const SizedBox(height: 40),
              
              // [핵심] AvatarWidget 사용 (Core 컴포넌트)
              ListenableBuilder(
                listenable: _settings,
                builder: (context, _) {
                  return GestureDetector(
                    onTap: () => _settings.pickProfileImage(),
                    child: Stack(
                      children: [
                        AvatarWidget(
                          base64Image: _settings.profileImageBase64,
                          colorValue: Colors.primaries[_settings.avatarIndex % Colors.primaries.length].value,
                          nickname: _nicknameController.text,
                          size: 120,
                        ),
                        Positioned(
                          right: 0, bottom: 0,
                          child: Container(
                            padding: const EdgeInsets.all(8),
                            decoration: const BoxDecoration(color: Colors.blue, shape: BoxShape.circle),
                            child: const Icon(Icons.camera_alt, size: 20, color: Colors.white),
                          ),
                        ),
                      ],
                    ),
                  );
                },
              ),
              
              const SizedBox(height: 30),
              
              TextField(
                controller: _nicknameController,
                textAlign: TextAlign.center,
                decoration: const InputDecoration(
                  labelText: '닉네임',
                  border: OutlineInputBorder(),
                  floatingLabelBehavior: FloatingLabelBehavior.always,
                ),
              ),
              
              const SizedBox(height: 30),
              
              ElevatedButton(
                onPressed: _enterLobby,
                style: ElevatedButton.styleFrom(
                  minimumSize: const Size(double.infinity, 50),
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
                ),
                child: const Text('입장하기', style: TextStyle(fontSize: 18)),
              ),
            ],
          ),
        ),
      ),
    );
  }
}