import type { Asset, Site } from "./data";
import headOffice from "./plant-location-policy.json";

export const HEAD_OFFICE = headOffice;

export type MapAsset = Pick<Asset, "id" | "code" | "name" | "category" | "type" | "is_active" | "site" | "latitude" | "longitude">;
export type MapSite = Pick<Site, "id" | "name" | "latitude" | "longitude">;
type Coordinates = { latitude: number | null; longitude: number | null };
export type MapLocation = Coordinates & {
  source: "site" | "missing-site" | "head-office" | "manual" | "unlocated";
  siteName: string | null;
};

export function hasCoords(point: Coordinates): boolean {
  const { latitude, longitude } = point;
  return latitude != null && longitude != null && Number.isFinite(latitude) && Number.isFinite(longitude)
    && Math.abs(latitude) <= 90 && Math.abs(longitude) <= 180 && (latitude !== 0 || longitude !== 0);
}

// Current assignment controls placement, independently of historic invoice hires.
// Resolve at read time so existing assignments and site-coordinate edits work
// immediately, without overwriting a machine's separately saved manual pin.
export function resolveAssetLocation(asset: Coordinates & { site?: string }, sites: MapSite[]): MapLocation {
  if (asset.site) {
    const site = sites.find(s => s.id === asset.site);
    return site && hasCoords(site)
      ? { latitude: site.latitude, longitude: site.longitude, source: "site", siteName: site.name }
      : { latitude: null, longitude: null, source: "missing-site", siteName: site?.name ?? "Unknown site" };
  }
  if (!hasCoords(asset)) return { latitude: null, longitude: null, source: "unlocated", siteName: null };
  const atOffice = Math.abs(asset.latitude! - HEAD_OFFICE.latitude) < 0.000001
    && Math.abs(asset.longitude! - HEAD_OFFICE.longitude) < 0.000001;
  return { latitude: asset.latitude, longitude: asset.longitude, source: atOffice ? "head-office" : "manual", siteName: null };
}