'use client'

import { useEffect, useRef, useState, useCallback } from 'react'
import { io, Socket } from 'socket.io-client'

export interface PresenceUser {
  userId: string
  name: string
  cursor: { x: number; y: number } | null
  color: string
}

export interface ActivityEvent {
  action: string
  userId: string
  userName: string
  details: any
}

const SOCKET_URL = process.env.NEXT_PUBLIC_SOCKET_URL || 'http://localhost:3005'

export function useBrainstormSocket(
  sessionId: string | null,
  userId: string | null,
  userName: string | null,
  onIdeaMoved?: (data: { ideaId: string; positionX: number; positionY: number }) => void
) {
  const socketRef = useRef<Socket | null>(null)
  const onIdeaMovedRef = useRef(onIdeaMoved)
  onIdeaMovedRef.current = onIdeaMoved
  const [others, setOthers] = useState<PresenceUser[]>([])
  const [activities, setActivities] = useState<ActivityEvent[]>([])
  const [aiProcessingNodeId, setAiProcessingNodeId] = useState<string | null>(null)

  const guestIdRef = useRef<string | null>(null)
  if (!guestIdRef.current && !userId) {
    guestIdRef.current = `guest_${Math.random().toString(36).slice(2, 10)}`
  }
  const effectiveUserId = userId || guestIdRef.current!

  useEffect(() => {
    if (!sessionId) return

    const socket = io(SOCKET_URL, {
      auth: {
        userId: effectiveUserId,
        sessionId,
        name: userName || 'Guest',
        isGuest: !userId,
      },
      transports: ['websocket'],
      autoConnect: true,
    })

    socketRef.current = socket

    socket.on('presence:update', (users: PresenceUser[]) => {
      setOthers(users.filter(u => u.userId !== effectiveUserId))
    })

    socket.on('cursor:update', (data: { userId: string; cursor: { x: number; y: number } }) => {
      setOthers(prev => prev.map(u =>
        u.userId === data.userId ? { ...u, cursor: data.cursor } : u
      ))
    })

    socket.on('activity:new', (event: ActivityEvent) => {
      setActivities(prev => [event, ...prev].slice(0, 50))
    })

    socket.on('idea:added', () => {})
    socket.on('idea:dismissed', () => {})
    socket.on('idea:moved', (data: { ideaId: string; positionX: number; positionY: number }) => {
      onIdeaMovedRef.current?.(data)
    })

    socket.on('idea:ai_processing', (data: { ideaId: string }) => {
      setAiProcessingNodeId(data.ideaId)
    })

    socket.on('idea:ai_completed', (data: { ideaId: string }) => {
      setAiProcessingNodeId(prev => prev === data.ideaId ? null : prev)
    })

    socket.on('idea:ai_failed', (data: { ideaId: string }) => {
      setAiProcessingNodeId(prev => prev === data.ideaId ? null : prev)
    })

    return () => {
      socket.disconnect()
      socketRef.current = null
    }
  }, [sessionId, effectiveUserId, userName])

  const moveCursor = useCallback((cursor: { x: number; y: number } | null) => {
    socketRef.current?.emit('cursor:move', cursor)
  }, [])

  const broadcastActivity = useCallback((action: string, details?: any) => {
    socketRef.current?.emit('activity:new', {
      action,
      userId: effectiveUserId,
      userName: userName || 'Guest',
      details,
    })
  }, [effectiveUserId, userName])

  return { others, activities, moveCursor, broadcastActivity, socketRef, aiProcessingNodeId }
}