import { assertEquals } from "@std/assert";
import { voiceTrack } from "../project/harmony.ts";
import { newChordTrack, newProject, placeChord, projectKey } from "../project/model.ts";
import { projectMidi } from "./export.ts";
import { parseMidi } from "./smf.ts";

Deno.test("a chord track with its bass off leaves each chord's lowest note out", () => {
  const p = newProject();
  const chords = newChordTrack();
  for (const [start, symbol] of [
    [0, "C/E"],
    [4, "F"],
    [8, "G7"],
  ] as const) {
    placeChord(chords, { id: symbol, start, dur: 4, symbol });
  }
  p.tracks = [chords];
  const voiced = voiceTrack(chords, projectKey(p)).map(v => [...v.notes].sort((a, b) => a - b));
  const exported = () => {
    const [part] = parseMidi(projectMidi(p));
    return [0, 4, 8].map(beat =>
      part.notes
        .filter(n => n.start === beat)
        .map(n => n.pitch)
        .sort((a, b) => a - b),
    );
  };

  assertEquals(exported(), voiced);
  chords.bass = false;
  assertEquals(
    exported(),
    voiced.map(notes => notes.slice(1)),
  );
});