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src/player/playlist.ts

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// src/player/playlist.ts
// Pure playlist index math — no DOM, no GPU. Returns the new index, wrapping
// when loop is on, or null when an end is reached and loop is off (signals the
// cycle to stop).
export function nextIndex(current: number, length: number, loop: boolean): number | null {
  if (length <= 0) return null;
  if (current + 1 < length) return current + 1;
  return loop ? 0 : null;
}

export function prevIndex(current: number, length: number, loop: boolean): number | null {
  if (length <= 0) return null;
  if (current - 1 >= 0) return current - 1;
  return loop ? length - 1 : null;
}