import type { StoredPack } from "@/lib/offline/db";
import type { HiveSetupView, HiveSystemDto } from "./types";

// What the offline packs say about hives (spec 10). Both fields are optional:
// a pack from before the hive card says nothing, and "nothing" is not "no hive".

function newestFirst(packs: readonly StoredPack[]): StoredPack[] {
  return [...packs].sort((a, b) => b.savedAt.localeCompare(a.savedAt));
}

/**
 * The colony's hive per its newest pack. `null`: no pack lists the colony or
 * the pack predates hives, so it cannot tell. `{ setup: null }`: the pack
 * knows the colony and the colony has no hive yet.
 */
export function hiveFromPacks(
  packs: readonly StoredPack[],
  colonyId: string,
): { setup: HiveSetupView | null } | null {
  const holding = newestFirst(packs).find((stored) =>
    stored.pack.colonies.some((colony) => colony.id === colonyId),
  );
  if (!holding?.pack.hives) return null;
  return { setup: holding.pack.hives[colonyId] ?? null };
}

/** The hive systems of the newest pack that carries them; null when none does. */
export function hiveCatalogFromPacks(packs: readonly StoredPack[]): HiveSystemDto[] | null {
  return newestFirst(packs).find((stored) => stored.pack.hiveCatalog)?.pack.hiveCatalog ?? null;
}