import { useEffect, useRef, useState } from 'react'
import { createBluetoothDiscovery } from '../discovery'

// 工厂回调 → React state 的映射产物
export interface BleUiState {
  searching: boolean
  connected: boolean
  deviceList: Array<{ deviceId: string; name?: string; RSSI?: number }>
  profileId: string
  stage: string
  deviceInfo: Record<string, unknown> | null
  authResult: unknown
}

export function useBle() {
  const [state, setState] = useState<BleUiState>({
    searching: false,
    connected: false,
    deviceList: [],
    profileId: 'UNKNOWN',
    stage: 'IDLE',
    deviceInfo: null,
    authResult: null
  })

  // discovery 实例在整个组件生命周期内只创建一次；
  // 回调里读最新 state 用 setState 函数式更新，不闭包旧值
  const discoveryRef = useRef<ReturnType<typeof createBluetoothDiscovery> | null>(null)
  if (discoveryRef.current === null) {
    discoveryRef.current = createBluetoothDiscovery({
      onSearchingChange: (searching) => setState((s) => ({ ...s, searching })),
      onConnectedChange: (connected) => setState((s) => ({ ...s, connected })),
      onDeviceListChange: (deviceList) => setState((s) => ({ ...s, deviceList })),
      onProfileChange: (profileId) => setState((s) => ({ ...s, profileId })),
      onStageChange: (stage) => setState((s) => ({ ...s, stage })),
      onDeviceInfoChange: (deviceInfo) => setState((s) => ({ ...s, deviceInfo })),
      onAuthChange: (authResult) => setState((s) => ({ ...s, authResult }))
      // onError / onRadarData / onProtocolState / onProtocolMsg 按页面需要接入
    })
  }

  // 卸载时统一清理（停扫描、断连接、解绑事件）
  useEffect(() => {
    const discovery = discoveryRef.current
    return () => {
      discovery?.cleanupDiscovery()
      discoveryRef.current = null
    }
  }, [])

  const discovery = discoveryRef.current!

  return { state, discovery }
}