const express = require('express');
const http = require('http');
const { Server } = require('socket.io');
const cors = require('cors');
const { GameManager } = require('./game/GameManager');

const app = express();
app.use(cors());
app.use(express.json());

const server = http.createServer(app);
const io = new Server(server, {
  cors: { origin: '*', methods: ['GET', 'POST'] },
});

const gm = new GameManager();

app.get('/api/cards', (req, res) => {
  res.json(gm.getCardList());
});

app.get('/api/starter-decks', (req, res) => {
  res.json(gm.getStarterDecks());
});

app.get('/api/rooms', (req, res) => {
  res.json(gm.getRooms());
});

io.on('connection', (socket) => {
  let playerName = 'Player';
  let playerId = socket.id;

  console.log(`Player connected: ${playerId}`);

  socket.on('setName', (name) => {
    playerName = name || 'Player';
    socket.emit('nameSet', { id: playerId, name: playerName });
  });

  socket.on('createRoom', (data) => {
    const room = gm.createRoom(playerId, playerName, data?.roomName);
    socket.join(room.id);
    socket.emit('roomCreated', room);
    io.emit('roomsUpdated', gm.getRooms());
  });

  socket.on('joinRoom', (data) => {
    const result = gm.joinRoom(data.roomId, playerId, playerName);
    if (result.error) {
      socket.emit('error', { message: result.error });
      return;
    }
    socket.join(data.roomId);
    socket.emit('roomJoined', result.room);
    io.to(data.roomId).emit('roomUpdated', result.room);
    io.emit('roomsUpdated', gm.getRooms());
  });

  socket.on('leaveRoom', () => {
    const currentRoomId = gm.playerRooms.get(playerId);
    const result = gm.leaveRoom(playerId);
    if (result.error) return;

    if (currentRoomId) {
      socket.leave(currentRoomId);
      if (!result.roomDeleted) {
        io.to(currentRoomId).emit('roomUpdated', result.room);
      }
    }
    io.emit('roomsUpdated', gm.getRooms());
  });

  socket.on('selectDeck', (data) => {
    const result = gm.selectDeck(playerId, data.deckColor);
    if (result.error) {
      socket.emit('error', { message: result.error });
      return;
    }
    const roomId = gm.playerRooms.get(playerId);
    io.to(roomId).emit('roomUpdated', result.room);
  });

  socket.on('selectCustomDeck', (data) => {
    const result = gm.selectCustomDeck(playerId, data.cardIds);
    if (result.error) {
      socket.emit('error', { message: result.error });
      return;
    }
    const roomId = gm.playerRooms.get(playerId);
    io.to(roomId).emit('roomUpdated', result.room);
  });

  socket.on('startGame', () => {
    const roomId = gm.playerRooms.get(playerId);
    if (!roomId) {
      socket.emit('error', { message: 'Not in a room' });
      return;
    }

    const room = gm.getRoomDetails(roomId);
    if (!room || room.hostId !== playerId) {
      socket.emit('error', { message: 'Only the host can start the game' });
      return;
    }

    const result = gm.startGame(roomId);
    if (result.error) {
      socket.emit('error', { message: result.error });
      return;
    }

    room.players.forEach((p) => {
      const playerState = gm.getGameState(result.gameId, p.id);
      io.to(p.id).emit('gameStarted', { gameId: result.gameId, state: playerState });
    });
  });

  socket.on('gameAction', (data) => {
    const roomId = gm.playerRooms.get(playerId);
    if (!roomId) return;

    const room = gm.getRoomDetails(roomId);
    if (!room || !room.gameId) return;

    const result = gm.handleGameAction(room.gameId, playerId, data.action);
    if (result.error) {
      socket.emit('actionError', { message: result.error });
      return;
    }

    room.players.forEach((p) => {
      const playerState = gm.getGameState(room.gameId, p.id);
      io.to(p.id).emit('gameStateUpdated', playerState);
    });

    if (result.needsResponse) {
      socket.emit('needsResponse', {
        type: result.needsResponse,
        options: result.options,
      });
    }
  });

  socket.on('getRooms', () => {
    socket.emit('roomsUpdated', gm.getRooms());
  });

  socket.on('disconnect', () => {
    console.log(`Player disconnected: ${playerId}`);
    const roomId = gm.playerRooms.get(playerId);
    if (roomId) {
      const result = gm.leaveRoom(playerId);
      if (result && !result.error) {
        if (!result.roomDeleted) {
          io.to(roomId).emit('roomUpdated', result.room);
          io.to(roomId).emit('playerDisconnected', { playerId, playerName });
        }
        io.emit('roomsUpdated', gm.getRooms());
      }
    }
  });
});

const PORT = process.env.PORT || 3001;
server.listen(PORT, '0.0.0.0', () => {
  const os = require('os');
  const interfaces = os.networkInterfaces();
  let lanIp = 'localhost';
  for (const iface of Object.values(interfaces)) {
    for (const alias of iface) {
      if (alias.family === 'IPv4' && !alias.internal) {
        lanIp = alias.address;
        break;
      }
    }
  }
  console.log(`\n  Arcane Duels Server running on:`);
  console.log(`    Local:   http://localhost:${PORT}`);
  console.log(`    Network: http://${lanIp}:${PORT}\n`);
});