import { Server as HTTPServer } from "http";
import { Server, Socket } from "socket.io";

export type SocketServer = Server;
export type SocketClient = Socket;

export function setupSocketIO(httpServer: HTTPServer): SocketServer {
  const io = new Server(httpServer, {
    cors: {
      origin: process.env.CLIENT_URL || "*",
      methods: ["GET", "POST"],
    },
  });

  io.on("connection", (socket: SocketClient) => {
    console.log(`Client connected: ${socket.id}`);

    // Join a draft room
    socket.on("join-draft", (seasonId: string) => {
      const roomName = `draft-${seasonId}`;
      socket.join(roomName);
      console.log(`Socket ${socket.id} joined draft room: ${roomName}`);
      
      // Notify others in the room
      socket.to(roomName).emit("user-joined", { socketId: socket.id });
    });

    // Leave a draft room
    socket.on("leave-draft", (seasonId: string) => {
      const roomName = `draft-${seasonId}`;
      socket.leave(roomName);
      console.log(`Socket ${socket.id} left draft room: ${roomName}`);
    });

    // Handle disconnection
    socket.on("disconnect", () => {
      console.log(`Client disconnected: ${socket.id}`);
    });

    // Draft-specific events will be added in Phase 9
    // For now, we're just setting up the infrastructure
  });

  return io;
}

// Export a singleton instance that will be set by the server
let ioInstance: SocketServer | null = null;

export function setSocketIO(io: SocketServer) {
  ioInstance = io;
}

export function getSocketIO(): SocketServer {
  if (!ioInstance) {
    throw new Error("Socket.IO has not been initialized");
  }
  return ioInstance;
}