import { useState, useCallback } from 'react';
import * as Location from 'expo-location';

interface GeoState {
  loading: boolean;
  error: string | null;
}

/**
 * Native (iOS/Android) geolocation hook using expo-location.
 * Identical public API to useGeolocation.ts (web version) —
 * Metro resolves this file on native, the .ts file on web.
 */
export function useGeolocation() {
  const [state, setState] = useState<GeoState>({ loading: false, error: null });

  const locate = useCallback((onSuccess: (lat: number, lng: number) => void) => {
    setState({ loading: true, error: null });

    void (async () => {
      try {
        const { status } = await Location.requestForegroundPermissionsAsync();

        if (status !== Location.PermissionStatus.GRANTED) {
          setState({
            loading: false,
            error: 'Location permission denied. Please enable it in Settings.',
          });
          return;
        }

        const loc = await Location.getCurrentPositionAsync({
          accuracy: Location.Accuracy.High,
        });

        setState({ loading: false, error: null });
        onSuccess(loc.coords.latitude, loc.coords.longitude);
      } catch (err) {
        let message = 'Unable to get location. Try again or place the pin manually.';
        if (err instanceof Error) {
          if (err.message.includes('timed out')) {
            message = 'Location request timed out. Try again.';
          }
        }
        setState({ loading: false, error: message });
      }
    })();
  }, []);

  const clearError = useCallback(() => {
    setState((s) => ({ ...s, error: null }));
  }, []);

  return { ...state, locate, clearError };
}