// Google Places (New) Nearby Search — powers the "nearby mall / hospital /
// pharmacy / restaurant" destination chips on the home screen. Reuses the same
// API key and header pattern as the autocomplete in components/google-text-input.

import { haversine } from "@/lib/utils";
import type { NearbyPlace } from "@/types/type";

const googleApiKey = process.env.EXPO_PUBLIC_GOOGLE_API_KEY!;

// The four POI categories surfaced as quick destination chips. Each maps to a
// Google Places (New) `includedTypes` value.
export type PoiCategory = {
  id: "mall" | "hospital" | "pharmacy" | "restaurant";
  label: string;
  /** MaterialCommunityIcons glyph name. */
  icon: string;
  googleType: string;
};

export const POI_CATEGORIES: PoiCategory[] = [
  { id: "mall", label: "Mall", icon: "shopping-mall", googleType: "shopping_mall" },
  { id: "hospital", label: "Hospital", icon: "hospital", googleType: "hospital" },
  { id: "pharmacy", label: "Pharmacy", icon: "pill", googleType: "pharmacy" },
  { id: "restaurant", label: "Restaurant", icon: "silverware-fork-knife", googleType: "restaurant" },
];

const DEFAULT_RADIUS_M = 4000;

// Searches for the nearest place of `googleType` around (latitude, longitude)
// and returns it as a NearbyPlace with its distance from the rider. Returns
// null when no place of that type is found nearby — the chip then shows an
// empty state rather than a broken one.
export const searchNearby = async (
  googleType: string,
  {
    latitude,
    longitude,
    radiusM = DEFAULT_RADIUS_M,
  }: { latitude: number; longitude: number; radiusM?: number },
): Promise<NearbyPlace | null> => {
  try {
    const res = await fetch(
      "https://places.googleapis.com/v1/places:searchNearby",
      {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
          "X-Goog-Api-Key": googleApiKey,
          "X-Goog-FieldMask":
            "places.displayName,places.formattedAddress,places.location,places.id",
        },
        body: JSON.stringify({
          includedTypes: [googleType],
          languageCode: "en",
          regionCode: "lb",
          locationRestriction: {
            circle: {
              center: { latitude, longitude },
              radius: radiusM,
            },
          },
        }),
      },
    );
    const data = await res.json();
    const place = data.places?.[0];
    if (!place) return null;

    const lat = place.location?.latitude as number;
    const lng = place.location?.longitude as number;

    return {
      name: (place.displayName?.text as string) ?? "Nearby place",
      address: (place.formattedAddress as string) ?? "",
      latitude: lat,
      longitude: lng,
      distanceMeters:
        Number.isFinite(lat) && Number.isFinite(lng)
          ? haversine(latitude, longitude, lat, lng)
          : undefined,
    };
  } catch (error) {
    console.log("[PLACES_NEARBY]: ", error);
    return null;
  }
};