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'

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)
      })
      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
    })
  }
}

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

  function bindDispatcher() {
    if (offCharacteristic) {
      return
    }

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

  function unbindDispatcher() {
    if (!offCharacteristic) {
      return
    }

    offCharacteristic()
    offCharacteristic = null
  }

  async function init() {
    await ble.openAdapter()
    ble.watchAdapterState()
    ble.watchConnectionChange()
    ble.watchCharacteristicValue()
    bindDispatcher()
  }

  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()
    }
  }

  async function cleanup() {
    unbindDispatcher()
    await ble.cleanup()
  }

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