import {createBleCore} from './bleCore'
import {createAuthModule} from '../modules/auth'
import {createWifiModule} from '../modules/wifi'
import {createRadarModule} from '../modules/radar'
import {parseStateCode, parseDeviceInfo} from '../parsers'
import {DEVICE_PROFILE, guessProfileByRadarFrame} from '../protocols/profiles'
import {uuidEquals} from '../utils/uuid'

/**
 * 创建特征值通知分发器。
 * 根据特征UUID将通知分发到对应协议事件：state / msg / radar / raw。
 * 雷达帧还能自动推断设备 profile（ED713/ED719）。
 */
function createCharacteristicDispatcher(ble) {
  return (event) => {
    const state = ble.getState()
    const profile = ble.getProfile()
    const current = state.characteristics

    if (current.state && uuidEquals(event.characteristicId, current.state.uuid)) {
      const stateCode = parseStateCode(event.value)
      ble.setAuthState({
        lastStateCode: stateCode,
        keyMatched: stateCode === 7 || stateCode === 5 || state.auth.keyMatched
      })

      ble.emit('protocol:state', {
        ...event,
        profileId: profile.id,
        stateCode
      })
      return
    }

    if (current.msg && uuidEquals(event.characteristicId, current.msg.uuid)) {
      ble.emit('protocol:msg', {
        ...event,
        profileId: profile.id,
        deviceInfo: parseDeviceInfo(event.value, profile.id)
      })
      return
    }

    if (current.radar && uuidEquals(event.characteristicId, current.radar.uuid)) {
      const guessed = guessProfileByRadarFrame(event.value)
      if (state.profileId === DEVICE_PROFILE.UNKNOWN && guessed !== DEVICE_PROFILE.UNKNOWN) {
        ble.setProfile(guessed)
      }

      ble.emit('protocol:radar', {
        ...event,
        profileId: ble.getProfile().id
      })
      return
    }

    ble.emit('protocol:raw', {
      ...event,
      profileId: profile.id
    })
  }
}

/**
 * 统一BLE控制器：整合核心能力 + 认证/WiFi/雷达三大业务模块。
 * 页面层应通过此控制器编排完整业务流程。
 * @param {object} options 透传给 createBleCore 的配置（重试策略/日志/profileId等）
 */
export function createUnifiedBleController(options = {}) {
  const ble = createBleCore(options)
  const auth = createAuthModule(ble)
  const wifi = createWifiModule(ble)
  const radar = createRadarModule(ble)

  const characteristicDispatcher = createCharacteristicDispatcher(ble)
  let offCharacteristic = null

  /** 绑定特征值分发器到 ble 事件总线。 */
  function bindDispatcher() {
    if (offCharacteristic) {
      return
    }

    offCharacteristic = ble.on('characteristic:value', characteristicDispatcher)
  }

  /** 解绑特征值分发器。 */
  function unbindDispatcher() {
    if (!offCharacteristic) {
      return
    }

    offCharacteristic()
    offCharacteristic = null
  }

  /** 初始化蓝牙适配器并注册所有监听（适配器状态/连接/特征值/分发器）。 */
  async function init() {
    await ble.openAdapter()
    ble.watchAdapterState()
    ble.watchConnectionChange()
    ble.watchCharacteristicValue()
    bindDispatcher()
  }

  /**
   * 扫描并选取目标设备。
   * 先按服务UUID过滤扫描，无结果时可退化为无过滤扫描。
   * @param {object} params
   * @param {string} params.serviceUuid 目标服务UUID，默认取 profile 配置
   * @param {number} params.scanDuration 扫描时长(ms)，默认5000
   * @param {boolean} params.fallbackWithoutFilter 首次无结果时是否退化为无过滤扫描，默认true
   * @returns {object|null} 匹配到的设备对象，未找到返回 null
   */
  async function scanAndPickDevice({
                                     serviceUuid,
                                     scanDuration = 5000,
                                     fallbackWithoutFilter = true
                                   } = {}) {
    const profile = ble.getProfile()
    const targetService = serviceUuid || profile.uuids.service

    ble.watchDeviceFound()

    await ble.startDiscovery({services: [targetService]})
    await new Promise((resolve) => setTimeout(resolve, scanDuration))
    await ble.stopDiscovery()

    let selected = ble.pickDeviceByService(targetService)

    if (!selected && fallbackWithoutFilter) {
      await ble.startDiscovery({services: []})
      await new Promise((resolve) => setTimeout(resolve, scanDuration))
      await ble.stopDiscovery()
      selected = ble.pickDeviceByService(targetService) || ble.listDiscoveredDevices()[0] || null
    }

    return selected
  }

  /**
   * 连接后严格执行协议前置：
   * - 发现服务和特征
   * - 订阅 UUID_STATE / UUID_RADAR
   */
  async function connectAndDiscover(deviceId) {
    await ble.connect(deviceId)
    await ble.discoverServices(deviceId)
    const chars = await ble.discoverCharacteristics()

    if (chars.state && chars.state.uuid) {
      try {
        await ble.notifyCharacteristic(chars.state.uuid, true);
        console.debug('[BLE][SUB]', 'notify STATE ok', chars.state.uuid)
      } catch (e) {
        console.debug('[BLE][SUB]', 'notify STATE fail', e?.message || e)
      }
    }

    if (chars.radar && chars.radar.uuid) {
      try {
        await ble.notifyCharacteristic(chars.radar.uuid, true);
        console.debug('[BLE][SUB]', 'notify RADAR ok', chars.radar.uuid)
      } catch (e) {
        console.debug('[BLE][SUB]', 'notify RADAR fail', e?.message || e)
      }
    }

    return chars
  }

  /**
   * 标准流程：连接 -> 订阅 -> 鉴权。
   * 鉴权内部会按 bindStatus 分支处理绑定/匹配。
   */
  async function standardConnectFlow({deviceId, key}) {
    await init()

    let targetDeviceId = deviceId
    if (!targetDeviceId) {
      const device = await scanAndPickDevice()
      if (!device) {
        throw new Error('未找到可连接设备')
      }

      targetDeviceId = device.deviceId
    }

    await connectAndDiscover(targetDeviceId)
    const authResult = await auth.ensureAuthorized(key)

    return {
      deviceId: targetDeviceId,
      authResult,
      state: ble.getState(),
      profile: ble.getProfile()
    }
  }

  /** 释放所有资源：解绑分发器 + 清理核心BLE（停扫描/断连接/移监听/关适配器）。 */
  async function cleanup() {
    unbindDispatcher()
    await ble.cleanup()
  }

  return {
    ble,
    auth,
    wifi,
    radar,
    init,
    scanAndPickDevice,
    connectAndDiscover,
    standardConnectFlow,
    cleanup
  }
}