import * as Location from 'expo-location'
import * as TaskManager from 'expo-task-manager'
import { Platform } from 'react-native'
import { PlayerLocation, setLastLocation } from './features/location/locationSlice'
import store from './store'
import { useEffect } from 'react'
import { socket } from './socket'
import { Constants } from '@/constants/Constants'

const LOCATION_TASK = "fetch-geolocation"

TaskManager.defineTask(LOCATION_TASK, async ({ data, error }: any) => {
  if (error) {
    console.error(error)
    return
  }
  const { locations } = data
  const lastLoc: Location.LocationObject = locations.at(-1)
  store.dispatch(setLastLocation(lastLoc))
  const playerId = store.getState().game.playerId
  if (socket.active && playerId) {
    const lastLocToSend: PlayerLocation = {
      playerId: playerId,
      longitude: lastLoc.coords.longitude,
      latitude: lastLoc.coords.latitude,
      speed: lastLoc.coords.speed ?? 0,
      accuracy: lastLoc.coords.accuracy ?? 0,
      altitude: lastLoc.coords.altitude ?? 0,
      altitudeAccuracy: lastLoc.coords.altitudeAccuracy ?? 0,
      timestamp: new Date(lastLoc.timestamp).toISOString(),
    }
    socket.emit('last-location', lastLocToSend)
  }
})
  
export async function startGeolocationService(): Promise<void | (() => void)> {
  if (Platform.OS !== "web" && await Location.hasStartedLocationUpdatesAsync(LOCATION_TASK))
    return async () => await Location.stopLocationUpdatesAsync(LOCATION_TASK)

  await Location.enableNetworkProviderAsync().catch(error => alert(error))

  const { status: foregroundStatus } = await Location.requestForegroundPermissionsAsync()
  if (foregroundStatus !== 'granted')
    alert("Vous devez activer votre géolocalisation pour utiliser l'application.")

  const { status: backgroundStatus } = await Location.requestBackgroundPermissionsAsync()
  if (backgroundStatus !== 'granted')
    alert("Vous devez activer votre géolocalisation en arrière-plan pour utiliser l'application.")

  if (Platform.OS !== "web") {
    await Location.startLocationUpdatesAsync(LOCATION_TASK, {
      accuracy: Constants.LOCATION_ACCURACY,
      activityType: Location.ActivityType.OtherNavigation,
      deferredUpdatesInterval: 1000,
      timeInterval: 1000,
      foregroundService: {
        killServiceOnDestroy: false,
        notificationBody: "Géolocalisation activée pour « Traintrape-moi »",
        notificationTitle: "Traintrape-moi",
        notificationColor: "#FFFF00",
      }
    })
    return async () => await Location.stopLocationUpdatesAsync(LOCATION_TASK)
  }
  else {
    const locationSubscription = await Location.watchPositionAsync({ accuracy: Constants.LOCATION_ACCURACY }, location_nouveau => store.dispatch(setLastLocation(location_nouveau)))
    return locationSubscription.remove
  }
}

export const useStartGeolocationServiceEffect = () => useEffect(() => {
  let cleanup: void | (() => void) = () => {}
  startGeolocationService().then(result => cleanup = result)
  return cleanup
}, [])