import type { Role } from "../core/types.ts";
import type { RefTrack } from "./smf.ts";

// Best-effort role for a reference MIDI track; null = unmapped (excluded from scoring until the user maps it).
export function guessRole(t: RefTrack): Role | null {
  if (t.isDrums) return "drums";
  const n = t.name.trim().toLowerCase();
  if (/vocal|voice|vox|sing/.test(n)) return "vocals";
  if (/bass/.test(n)) return "bass";
  if (/guitar|delay/.test(n)) return "guitar";
  if (/piano|key|synth|organ/.test(n)) return "keys";
  const p = t.program;
  if (p >= 32 && p <= 39) return "bass";
  if (p >= 24 && p <= 31) return "guitar";
  if ((p >= 0 && p <= 7) || (p >= 16 && p <= 23) || (p >= 88 && p <= 95)) return "keys";
  return null;
}