import type { Ranking, RankingRow } from "@dci/core";
import { DASH, fmtCompact, fmtInt, fmtMw } from "@/lib/format";
import { entityHref } from "@/lib/routes";

export const SCOPE_LABEL: Record<Ranking["scope"], string> = {
  countries: "Countries",
  metros: "Markets",
  operators: "Operators",
  facilities: "Facilities",
};

export const SCOPE_ORDER: Ranking["scope"][] = ["countries", "metros", "operators", "facilities"];

/** Format a ranking value according to the ranking unit. */
export function fmtRankValue(v: number | null | undefined, unit: string): string {
  if (v === null || v === undefined || !Number.isFinite(v)) return DASH;
  const u = unit.toLowerCase();
  if (u === "mw") return fmtMw(v);
  if (u.includes("per") || u.includes("kw") || u.includes("$")) return `${fmtCompact(v, 2)} ${unit}`;
  return fmtInt(v);
}

/** First sentence of the methodology text (for excerpts). */
export function firstSentence(text: string): string {
  const m = text.match(/^.*?[.!?](\s|$)/);
  return (m ? m[0] : text).trim();
}

/** "Secondary: known MW." → "Known MW" */
export function secondaryLabel(methodology: string): string {
  const m = methodology.match(/Secondary:\s*([^.]+)\./i);
  if (!m) return "Secondary";
  const s = m[1]!.trim();
  return s.charAt(0).toUpperCase() + s.slice(1);
}

/** Site href for a ranking row — the API already returns a site path; fall back to entityHref. */
export function rowHref(row: RankingRow, scope: Ranking["scope"]): string {
  if (row.href && row.href.startsWith("/")) return row.href;
  const type = scope === "countries" ? "country" : scope === "metros" ? "metro" : scope === "operators" ? "operator" : "facility";
  return entityHref(type, row.slug, row.name);
}