import type { Note } from '../types.ts';

// Pure note-list operations used by the editor; kept free of DOM and state
// so the node test harness can exercise them directly.

export function quantizeNotes(notes: Note[], gridTicks: number, ids?: Set<string>): Note[] {
  if (gridTicks <= 0) return notes;
  return notes.map((n) => {
    if (ids && !ids.has(n.id)) return n;
    const tick = Math.max(0, Math.round(n.tick / gridTicks) * gridTicks);
    return { ...n, tick };
  });
}

export function transposeNotes(notes: Note[], semitones: number, ids?: Set<string>): Note[] {
  return notes.map((n) => {
    if (ids && !ids.has(n.id)) return n;
    const pitch = Math.max(0, Math.min(127, n.pitch + semitones));
    return { ...n, pitch };
  });
}