import 'dart:convert';
import 'package:bonsoir/bonsoir.dart';
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:playwith_core/playwith_core.dart'; // GameChatOverlay 포함됨
import 'package:playwith_game_quiz/quiz_game.dart';
import 'package:qr_flutter/qr_flutter.dart';

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

  @override
  State<LobbyScreen> createState() => _LobbyScreenState();
}

class _LobbyScreenState extends State<LobbyScreen> {
  final _net = NetworkManager();
  final List<String> _logs = [];
  final ScrollController _scrollController = ScrollController();

  @override
  void initState() {
    super.initState();
    
    _net.logStream.listen((log) {
      if (!mounted) return;
      setState(() {
        _logs.add(log);
        if (_logs.length > 100) _logs.removeAt(0);
      });
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (_scrollController.hasClients) {
          _scrollController.animateTo(
            _scrollController.position.maxScrollExtent,
            duration: const Duration(milliseconds: 200),
            curve: Curves.easeOut,
          );
        }
      });
    });

    _net.messageStream.listen((data) {
      if (data['type'] == 'GAME_START') {
        final String gameId = data['gameId'];
        if (gameId == 'quiz_ox') {
          _startGameAndNavigate(QuizGame());
        }
      }
    });
  }

  // [핵심] 채팅 오버레이 적용
  void _startGameAndNavigate(BaseGame game) {
    if (!mounted) return;
    
    game.onStart();

    Navigator.push(
      context,
      MaterialPageRoute(builder: (context) {
        Widget gameView;
        if (_net.role == NetworkRole.host) {
          gameView = game.buildHostView(context);
        } else {
          gameView = game.buildGuestView(context);
        }

        // 플랫폼 구조: 게임 화면 위에 채팅창 오버레이
        return Stack(
          children: [
            gameView, // 1. 게임 화면
            const SafeArea(
              child: GameChatOverlay(), // 2. 채팅창 (Core 제공)
            ),
          ],
        );
      }),
    );
  }

  @override
  Widget build(BuildContext context) {
    return ListenableBuilder(
      listenable: _net,
      builder: (context, child) {
        return Scaffold(
          appBar: AppBar(
            title: Text('대기실: ${_net.me.nickname}'),
            actions: [
              if (_net.role == NetworkRole.host)
                IconButton(
                  icon: const Icon(Icons.qr_code, size: 30),
                  onPressed: () => _showHostQRDialog(),
                ),
              
              if (_net.role != NetworkRole.none)
                IconButton(
                  icon: const Icon(Icons.exit_to_app),
                  onPressed: () => _net.stopNetwork(),
                )
            ],
          ),
          body: Column(
            children: [
              Expanded(flex: 3, child: _buildBody()),
              const Divider(thickness: 2, color: Colors.grey),
              _buildDebugConsole(),
            ],
          ),
        );
      },
    );
  }

  Widget _buildDebugConsole() {
    return Column(
      children: [
        Container(
          width: double.infinity,
          padding: const EdgeInsets.all(8.0),
          color: Colors.black87,
          child: const Text("DEBUG LOGS", style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
        ),
        SizedBox(
          height: 150, 
          child: Container(
            color: Colors.black,
            child: ListView.builder(
              controller: _scrollController,
              itemCount: _logs.length,
              itemBuilder: (context, index) {
                return Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 2.0),
                  child: Text(
                    _logs[index],
                    style: const TextStyle(color: Colors.greenAccent, fontSize: 12, fontFamily: 'Courier'),
                  ),
                );
              },
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildBody() {
    if (_net.role == NetworkRole.none) {
      return Center(
        child: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: [
                  _BigButton(
                    title: "방 만들기\n(Host)",
                    color: Colors.blue[100]!,
                    icon: Icons.add_home_work,
                    onTap: () {
                      _net.startHosting("${_net.me.nickname}의 방");
                      Future.delayed(const Duration(milliseconds: 500), () {
                        if (mounted && _net.role == NetworkRole.host) _showHostQRDialog();
                      });
                    },
                  ),
                  _BigButton(
                    title: "방 찾기\n(Guest)",
                    color: Colors.green[100]!,
                    icon: Icons.search,
                    onTap: () => _showRoomListDialog(),
                  ),
                ],
              ),
              const SizedBox(height: 30),
              ElevatedButton.icon(
                icon: const Icon(Icons.qr_code_scanner, size: 28),
                label: const Text("QR 코드로 접속하기"),
                style: ElevatedButton.styleFrom(
                  padding: const EdgeInsets.symmetric(horizontal: 30, vertical: 15),
                ),
                onPressed: () => _openQRScanner(),
              ),
              const SizedBox(height: 10),
              TextButton(
                 onPressed: () => _showManualJoinDialog(),
                 child: const Text("IP 주소 직접 입력 (비상용)", style: TextStyle(color: Colors.grey)),
              ),
            ],
          ),
        ),
      );
    }

    return Column(
      children: [
        Container(
          padding: const EdgeInsets.all(20.0),
          color: Colors.grey[100],
          width: double.infinity,
          child: Column(
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Icon(_net.role == NetworkRole.host ? Icons.wifi_tethering : Icons.wifi, color: Colors.blue),
                  const SizedBox(width: 10),
                  Text(
                    _net.role == NetworkRole.host ? "👑 방장 (나)" : "참가자 (나)",
                    style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                  ),
                ],
              ),
              
              if (_net.role == NetworkRole.host) ...[
                 const SizedBox(height: 10),
                 Row(
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: [
                     SelectableText(
                       "IP: ${_net.hostIp}  /  Port: ${_net.hostPort}", 
                       style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                     ),
                     const SizedBox(width: 10),
                     InkWell(
                       onTap: () => _showHostQRDialog(),
                       child: const Icon(Icons.qr_code, color: Colors.black87),
                     )
                   ],
                 ),
                 const SizedBox(height: 5),
                 const Text("QR 버튼을 눌러 친구들을 초대하세요!", style: TextStyle(fontSize: 12, color: Colors.grey)),
              ],
            ],
          ),
        ),

        const Divider(height: 1),

        Expanded(
          child: ListView(
            padding: const EdgeInsets.all(16),
            children: [
              const Text("참가자 목록", style: TextStyle(color: Colors.grey)),
              const SizedBox(height: 10),
              _buildUserTile(_net.me),
              ..._net.guestList.map((guest) => _buildUserTile(guest)),
              
              if (_net.guestList.isEmpty && _net.role == NetworkRole.host)
                const Padding(
                  padding: EdgeInsets.all(40.0),
                  child: Center(child: Text("참가자를 기다리는 중...\nQR 코드를 보여주세요.", textAlign: TextAlign.center, style: TextStyle(color: Colors.grey))),
                ),
            ],
          ),
        ),

        _buildReadyButton(),
      ],
    );
  }

  Widget _buildUserTile(UserInfo user) {
    bool isMe = user.id == _net.me.id;
    return Card(
      elevation: 2,
      color: user.isReady ? Colors.green[50] : Colors.white,
      margin: const EdgeInsets.symmetric(vertical: 6),
      child: ListTile(
        leading: CircleAvatar(
          backgroundColor: Color(user.colorValue),
          child: Text(user.nickname[0], style: const TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
        ),
        title: Text(
          user.nickname + (isMe ? " (나)" : ""),
          style: const TextStyle(fontWeight: FontWeight.bold),
        ),
        trailing: user.isReady
            ? const Icon(Icons.check_circle, color: Colors.green, size: 32)
            : const Icon(Icons.hourglass_empty, color: Colors.grey, size: 32),
      ),
    );
  }

  Widget _buildReadyButton() {
    bool isReady = _net.me.isReady;
    bool canReady = _net.role == NetworkRole.host 
        ? _net.guestList.isNotEmpty 
        : true; 

    return Container(
      width: double.infinity,
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        boxShadow: [BoxShadow(color: Colors.black12, blurRadius: 10, offset: const Offset(0, -5))],
      ),
      child: ElevatedButton(
        onPressed: canReady 
            ? () => _net.toggleReady()
            : () {
                ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("참가자가 들어와야 게임을 시작할 수 있습니다.")));
              },
        style: ElevatedButton.styleFrom(
          backgroundColor: !canReady 
              ? Colors.grey 
              : (isReady ? Colors.redAccent : Colors.blueAccent),
          padding: const EdgeInsets.symmetric(vertical: 18),
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
          elevation: canReady ? 5 : 0,
        ),
        child: Text(
          isReady ? "준비 취소 (WAIT)" : "준비 완료 (READY)",
          style: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold, color: Colors.white),
        ),
      ),
    );
  }

  void _showHostQRDialog() {
    if (_net.hostIp == null || _net.hostPort == null) return;
    final qrData = jsonEncode({'ip': _net.hostIp, 'port': _net.hostPort});
    showDialog(
      context: context,
      builder: (context) => Dialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              const Text("초대 QR 코드", style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold)),
              const SizedBox(height: 20),
              Container(
                padding: const EdgeInsets.all(10),
                decoration: BoxDecoration(border: Border.all(color: Colors.black12), borderRadius: BorderRadius.circular(10)),
                child: QrImageView(data: qrData, version: QrVersions.auto, size: 220.0),
              ),
              const SizedBox(height: 20),
              Text("IP: ${_net.hostIp}  /  Port: ${_net.hostPort}", style: const TextStyle(color: Colors.grey)),
              const SizedBox(height: 20),
              ElevatedButton(onPressed: () => Navigator.pop(context), child: const Text("닫기"))
            ],
          ),
        ),
      ),
    );
  }

  void _openQRScanner() {
    bool isScanCompleted = false;
    Navigator.of(context).push(MaterialPageRoute(
      builder: (context) => Scaffold(
        appBar: AppBar(title: const Text("QR 코드 스캔")),
        body: MobileScanner(
          onDetect: (capture) {
            if (isScanCompleted) return;
            final List<Barcode> barcodes = capture.barcodes;
            for (final barcode in barcodes) {
              final String? code = barcode.rawValue;
              if (code != null) {
                try {
                  final data = jsonDecode(code);
                  if (data['ip'] != null && data['port'] != null) {
                    isScanCompleted = true;
                    Navigator.pop(context);
                    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text("QR 인식 성공! 접속 중...")));
                    _net.joinRoom(data['ip'], data['port']);
                    return;
                  }
                } catch (e) {}
              }
            }
          },
        ),
      ),
    ));
  }

  void _showRoomListDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text("방 찾는 중..."),
        content: SizedBox(
          width: double.maxFinite,
          height: 300,
          child: StreamBuilder<List<BonsoirService>>(
            stream: _net.discoverRooms(),
            builder: (context, snapshot) {
              if (!snapshot.hasData || snapshot.data!.isEmpty) {
                return const Center(child: Text("검색 중... (로그를 확인하세요)"));
              }
              final services = snapshot.data!;
              return ListView.builder(
                itemCount: services.length,
                itemBuilder: (context, index) {
                  final service = services[index];
                  final displayName = service.name.split('#').first;
                  final ip = service.attributes?['ip'] ?? '알 수 없음';
                  return ListTile(
                    leading: const Icon(Icons.meeting_room),
                    title: Text(displayName),
                    subtitle: Text("IP: $ip"),
                    onTap: () {
                       Navigator.pop(context);
                       if (service.attributes != null && service.attributes!['ip'] != null) {
                         _net.joinRoom(service.attributes!['ip']!, service.port);
                       }
                    },
                  );
                },
              );
            },
          ),
        ),
        actions: [TextButton(onPressed: () => Navigator.pop(context), child: const Text("닫기"))],
      ),
    );
  }

  void _showManualJoinDialog() {
    final ipController = TextEditingController(text: "192.168.");
    final portController = TextEditingController();
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text("수동 접속"),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Text("방장 화면의 IP/Port를 입력하세요."),
            TextField(controller: ipController, decoration: const InputDecoration(labelText: "IP")),
            TextField(controller: portController, decoration: const InputDecoration(labelText: "Port")),
          ],
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(context), child: const Text("취소")),
          ElevatedButton(
            onPressed: () {
              final ip = ipController.text.trim();
              final port = int.tryParse(portController.text.trim());
              if (ip.isNotEmpty && port != null) {
                Navigator.pop(context);
                _net.joinRoom(ip, port);
              }
            },
            child: const Text("접속"),
          ),
        ],
      ),
    );
  }
}

class _BigButton extends StatelessWidget {
  final String title;
  final Color color;
  final IconData icon;
  final VoidCallback onTap;
  const _BigButton({required this.title, required this.color, required this.icon, required this.onTap});
  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        width: 140, height: 140,
        decoration: BoxDecoration(
          color: color, borderRadius: BorderRadius.circular(20),
          boxShadow: [BoxShadow(color: Colors.black12, blurRadius: 10, offset: const Offset(0, 5))],
        ),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(icon, size: 40, color: Colors.black54),
            const SizedBox(height: 10),
            Text(title, textAlign: TextAlign.center, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
          ],
        ),
      ),
    );
  }
}