import { describe, expect, it } from "vitest";
import { executeMidiTask } from "../../src/core/midi-task";
import { encodeMidi, noteSpans, type MidiDocument } from "../../src/core/midi";

const document: MidiDocument = {
  name: "worker.mid",
  format: 0,
  division: 480,
  warnings: [],
  tracks: [
    {
      name: "Notes",
      events: [
        {
          kind: "channel",
          tick: 0,
          order: 0,
          status: 9,
          channel: 0,
          data: Uint8Array.of(60, 100),
        },
        {
          kind: "channel",
          tick: 480,
          order: 1,
          status: 8,
          channel: 0,
          data: Uint8Array.of(60, 0),
        },
      ],
    },
  ],
};

describe("MIDI worker task protocol", () => {
  it("parses, transforms and exports without UI state", () => {
    const encoded = encodeMidi(document);
    const parsed = executeMidiTask({
      kind: "parse",
      name: "worker.mid",
      bytes: Uint8Array.from(encoded).buffer,
    });
    expect(parsed.kind).toBe("document");
    if (parsed.kind !== "document") return;
    const transformed = executeMidiTask({
      kind: "operation",
      document: parsed.document,
      operation: { kind: "transpose", semitones: 12 },
    });
    expect(transformed.kind).toBe("document");
    if (transformed.kind !== "document") return;
    expect(noteSpans(transformed.document)[0]?.note).toBe(72);
    const edited = executeMidiTask({
      kind: "operation",
      document: transformed.document,
      operation: {
        kind: "edit-note",
        onOrder: noteSpans(transformed.document)[0]!.onOrder,
        note: 70,
        velocity: 80,
        startTick: 10,
        endTick: 240,
      },
    });
    expect(edited.kind).toBe("document");
    if (edited.kind !== "document") return;
    expect(noteSpans(edited.document)[0]).toMatchObject({
      note: 70,
      velocity: 80,
      startTick: 10,
      endTick: 240,
    });
    expect(
      executeMidiTask({
        kind: "export",
        document: edited.document,
        format: "csv",
      }).kind,
    ).toBe("text");
  });
});