import type { Scope } from "../repositories/scoreboardCacheRepository";
import type { RankSnapshot } from "../types/panit";

export function computePercentile(rank: number, totalCount: number): number {
  if (totalCount <= 0) return 0;
  return Math.round((1 - (rank - 1) / totalCount) * 100);
}

export function deltaFor(
  snapshot: RankSnapshot | undefined,
  currentRank: number,
  scope: Scope
): number | null {
  if (!snapshot) return null;
  if (scope.kind === "overall") return snapshot.overall - currentRank;
  if (snapshot.teamCode !== scope.teamCode || snapshot.team === undefined) {
    return null;
  }
  return snapshot.team - currentRank;
}