// Pure derivations for the statistics screen, extracted so they are unit-testable.

import type { Stats } from './model';

/** gamesPlayed is the total finished games (wins + losses + draws). */
export function gamesPlayed(s: Stats): number {
  return s.wins + s.losses + s.draws;
}

/** winRate is the percentage of finished games won, rounded; 0 when none played. */
export function winRate(s: Stats): number {
  const n = gamesPlayed(s);
  return n > 0 ? Math.round((s.wins / n) * 100) : 0;
}

/** hintSharePercent is the share of the player's plays that drew on a hint
 *  (hints used / plays × 100), unrounded; 0 when no plays. The screen formats it to one
 *  decimal in the active locale. */
export function hintSharePercent(s: Stats): number {
  return s.moves > 0 ? (s.hintsUsed / s.moves) * 100 : 0;
}