import type { Outcome, Match, AIPrediction, Team } from "./types";
import { type Lang, teamShort, dayName, monthEn, dict } from "./i18n";

export function outcomeLabel(match: Match, o: Outcome, lang: Lang = "ko"): string {
  const d = dict(lang);
  if (o === "TEAM_A_WIN") return `${teamShort(match.teamA, lang)} ${d.win}`;
  if (o === "TEAM_B_WIN") return `${teamShort(match.teamB, lang)} ${d.win}`;
  return d.drawLabel;
}

// D3: 확률 = 이긴다고 예측한 팀의 승리 확률. 라벨은 호출부에서 dict로 구성.
export function winProb(
  match: Match,
  p: Pick<AIPrediction, "outcome" | "confidencePct">,
): { team: Team | null; pct: number } {
  if (p.outcome === "TEAM_A_WIN") return { team: match.teamA, pct: p.confidencePct };
  if (p.outcome === "TEAM_B_WIN") return { team: match.teamB, pct: p.confidencePct };
  return { team: null, pct: p.confidencePct };
}

// "6월 12일 (금)" / "Jun 12 (Fri)" — 대시보드 날짜 그룹 헤더
export function dateHeading(iso: string, lang: Lang = "ko"): string {
  const dm = iso.match(/(\d{4})-(\d{2})-(\d{2})/);
  if (!dm) return iso;
  const [, y, mo, d] = dm;
  const dow = dayName(lang, new Date(Date.UTC(+y, +mo - 1, +d)).getUTCDay());
  return lang === "en"
    ? `${monthEn(+mo)} ${+d} (${dow})`
    : `${+mo}월 ${+d}일 (${dow})`;
}

// "11:00" — 경기 카드 시간
export function timeOnly(iso: string): string {
  const m = iso.match(/T(\d{2}):(\d{2})/);
  return m ? `${m[1]}:${m[2]}` : "";
}

// "2026-06-12" — 날짜 그룹 키
export function dateKey(iso: string): string {
  const m = iso.match(/(\d{4}-\d{2}-\d{2})/);
  return m ? m[1] : iso;
}

// "6.12(금) 11:00 KST" — 요일명만 로케일 적용
export function kickoffDisplay(iso: string, lang: Lang = "ko"): string {
  const dm = iso.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})/);
  if (!dm) return iso;
  const [, y, mo, d, hh, mm] = dm;
  const dow = dayName(lang, new Date(Date.UTC(+y, +mo - 1, +d)).getUTCDay());
  return `${+mo}.${+d}(${dow}) ${hh}:${mm} KST`;
}

export function pct(part: number, total: number): number {
  if (!total) return 0;
  return Math.round((part / total) * 100);
}