import type { CountrySummary } from "@dci/core";
import { api } from "@/lib/api";
import { routes } from "@/lib/routes";

/** iso2 → canonical country slug (falls back to the iso2, which the API also accepts). */
export async function countrySlugMap(): Promise<{ map: Map<string, string>; countries: CountrySummary[] }> {
  const r = await api.countries();
  const map = new Map<string, string>();
  for (const c of r.items) map.set(c.iso2.toUpperCase(), c.slug);
  return { map, countries: r.items };
}

export function countryHref(map: Map<string, string>, iso2: string | null | undefined): string | null {
  if (!iso2) return null;
  return routes.country(map.get(iso2.toUpperCase()) ?? iso2.toLowerCase());
}

/** construction + planned MW when at least one is published; null otherwise (never 0 for unknown). */
export function pipelineMw(m: { constructionMw: number | null; plannedMw: number | null }): number | null {
  if (m.constructionMw === null && m.plannedMw === null) return null;
  return (m.constructionMw ?? 0) + (m.plannedMw ?? 0);
}