import { expect, test } from "@playwright/test";
import { Buffer } from "node:buffer";

for (const path of ["/", "/deep/nested/midi/"]) {
  test(`inspects and edits MIDI locally at ${path}`, async ({ page }) => {
    const external: string[] = [];
    page.on("request", (request) => {
      if (!request.url().startsWith("http://127.0.0.1:4212"))
        external.push(request.url());
    });
    await page.goto(path);
    await expect(
      page.getByRole("heading", {
        name: "See, edit and hear the timeline locally.",
      }),
    ).toBeVisible();
    await expect(
      page.getByRole("img", { name: /Piano roll with 3 notes/u }),
    ).toBeVisible();
    await page.getByLabel("Semitones").fill("12");
    await page.getByRole("button", { name: "Apply transpose" }).click();
    await expect(page.getByRole("status")).toContainText("transposed");
    await expect(
      page.getByRole("heading", { name: "Event inspector" }),
    ).toBeVisible();
    expect(external).toEqual([]);
  });
}

test("parses and exports through the MIDI worker", async ({ page }) => {
  await page.goto("/");
  await page.getByLabel("Open MIDI file").setInputFiles({
    name: "worker.mid",
    mimeType: "audio/midi",
    buffer: midiFixture(),
  });
  await expect(page.getByRole("status")).toContainText("Parsed type 0 MIDI");
  const pending = page.waitForEvent("download");
  await page.getByRole("button", { name: "Download MIDI" }).click();
  expect((await pending).suggestedFilename()).toBe("worker.mid");
  await expect(page.getByRole("status")).toContainText(
    "MIDI export generated in the worker",
  );
});

test("edits a paired note and inspects a local SoundFont", async ({ page }) => {
  await page.goto("/");
  await page.getByRole("button", { name: "Select first note" }).click();
  await page.getByLabel("Pitch (0–127)").fill("61");
  await page.getByLabel("Velocity").fill("77");
  await page.getByRole("button", { name: "Apply note edit" }).click();
  await expect(page.getByRole("status")).toContainText("note updated");
  await page.getByLabel("Open SoundFont file").setInputFiles({
    name: "fixture.sf2",
    mimeType: "audio/x-soundfont",
    buffer: soundFontFixture(),
  });
  await expect(page.getByRole("status")).toContainText(
    "Inspected the local SoundFont structure",
  );
  await expect(page.getByText("Fixture bank", { exact: true })).toBeVisible();
});

test("keeps the installed MIDI application available offline", async ({
  page,
  context,
}) => {
  await page.goto("/");
  await page.evaluate(async () => navigator.serviceWorker.ready);
  await page.reload();
  await context.setOffline(true);
  try {
    await page.reload();
    await expect(
      page.getByRole("heading", {
        name: "See, edit and hear the timeline locally.",
      }),
    ).toBeVisible();
  } finally {
    await context.setOffline(false);
  }
});

function midiFixture(): Buffer {
  return Buffer.from([
    0x4d, 0x54, 0x68, 0x64, 0, 0, 0, 6, 0, 0, 0, 1, 1, 0xe0, 0x4d, 0x54, 0x72,
    0x6b, 0, 0, 0, 12, 0, 0x90, 60, 100, 0x83, 0x60, 60, 0, 0, 0xff, 0x2f, 0,
  ]);
}

function soundFontFixture(): Buffer {
  const chunk = (id: string, data: Buffer) => {
    const output = Buffer.alloc(8 + data.length + (data.length & 1));
    output.write(id, 0, "ascii");
    output.writeUInt32LE(data.length, 4);
    data.copy(output, 8);
    return output;
  };
  const list = (id: string, ...children: Buffer[]) =>
    chunk("LIST", Buffer.concat([Buffer.from(id, "ascii"), ...children]));
  const body = Buffer.concat([
    Buffer.from("sfbk", "ascii"),
    list("INFO", chunk("INAM", Buffer.from("Fixture bank\0"))),
    list("pdta", chunk("phdr", Buffer.alloc(76))),
  ]);
  const output = Buffer.alloc(8);
  output.write("RIFF", 0, "ascii");
  output.writeUInt32LE(body.length, 4);
  return Buffer.concat([output, body]);
}