export type RepeatMode = "off" | "all" | "one";

export function nextRepeatMode(mode: RepeatMode): RepeatMode {
  if (mode === "off") return "all";
  if (mode === "all") return "one";
  return "off";
}

export function shuffleTracks<T>(items: readonly T[], random: () => number = Math.random): T[] {
  const shuffled = [...items];

  for (let index = shuffled.length - 1; index > 0; index -= 1) {
    const swapIndex = Math.floor(random() * (index + 1));
    [shuffled[index], shuffled[swapIndex]] = [shuffled[swapIndex], shuffled[index]];
  }

  return shuffled;
}