frontend/src/lib/useGeolocation.ts

import { useCallback, useState } from "react";

export interface GeoState {
  lat: number | null;
  lon: number | null;
  error: string | null;
  loading: boolean;
}

// Pune city centre — fallback so the map is never empty during a demo.
export const DEFAULT_CENTER: [number, number] = [18.5204, 73.8567];

export function useGeolocation() {
  const [state, setState] = useState<GeoState>({
    lat: null,
    lon: null,
    error: null,
    loading: false,
  });

  const request = useCallback((): Promise<{ lat: number; lon: number } | null> => {
    return new Promise((resolve) => {
      if (!("geolocation" in navigator)) {
        setState((s) => ({ ...s, error: "Geolocation not supported" }));
        resolve(null);
        return;
      }
      setState((s) => ({ ...s, loading: true, error: null }));
      navigator.geolocation.getCurrentPosition(
        (pos) => {
          const lat = pos.coords.latitude;
          const lon = pos.coords.longitude;
          setState({ lat, lon, error: null, loading: false });
          resolve({ lat, lon });
        },
        (err) => {
          setState((s) => ({ ...s, loading: false, error: err.message }));
          resolve(null);
        },
        { enableHighAccuracy: true, timeout: 8000 },
      );
    });
  }, []);

  return { ...state, request };
}