import * as Location from "expo-location";
import { Linking } from "react-native";
import { useCallback, useEffect, useState } from "react";

export type LocationPermissionStatus =
  /** Permission granted. */
  | "granted"
  /** The user denied but we can still ask again. */
  | "denied"
  /** The user denied permanently ("Don't ask again") — must go to Settings. */
  | "blocked"
  /** First read hasn't completed. */
  | "unknown";

/**
 * Reports the foreground location permission as it is right now, so the
 * Settings screen can show the real state without re-running the request
 * prompt. Call `refresh()` again on focus (e.g. with `useFocusEffect`) so the
 * row updates when the user comes back from the system settings screen.
 */
export const useLocationPermission = () => {
  const [status, setStatus] = useState<LocationPermissionStatus>("unknown");

  const refresh = useCallback(async () => {
    try {
      const result = await Location.getForegroundPermissionsAsync();

      if (result.granted) {
        setStatus("granted");
      } else if (result.canAskAgain) {
        setStatus("denied");
      } else {
        setStatus("blocked");
      }
    } catch (error) {
      console.warn("[LOCATION_PERMISSION]: ", error);
      setStatus("unknown");
    }
  }, []);

  const openSettings = useCallback(async () => {
    try {
      await Linking.openSettings();
    } catch (error) {
      console.warn("[OPEN_SETTINGS]: ", error);
    }
  }, []);

  useEffect(() => {
    void refresh();
  }, [refresh]);

  return { status, refresh, openSettings };
};