import { describe, expect, test, vi } from "vitest";

import { registerBackgroundMessageHandler } from "../src/background/index";

describe("background-index", () => {
  test("downloads csv files when the content script sends a download message", async () => {
    const listeners: Array<
      (message: unknown, sender: unknown, sendResponse: (response: unknown) => void) => boolean | void
    > = [];
    const download = vi.fn(async () => undefined);
    const sendResponse = vi.fn();

    registerBackgroundMessageHandler({
      downloads: {
        download
      },
      runtime: {
        onMessage: {
          addListener(listener) {
            listeners.push(listener);
          }
        }
      }
    });

    expect(listeners).toHaveLength(1);
    const result = listeners[0](
      {
        csv: "列1,列2\n值1,值2",
        filename: "market.csv",
        type: "download-market-csv"
      },
      {},
      sendResponse
    );

    expect(result).toBe(true);
    await new Promise((resolve) => setTimeout(resolve, 0));

    expect(download).toHaveBeenCalledTimes(1);
    expect(download).toHaveBeenCalledWith(
      expect.objectContaining({
        filename: "market.csv",
        saveAs: false,
        url: expect.stringContaining("data:text/csv;charset=utf-8,")
      })
    );
    expect(sendResponse).toHaveBeenCalledWith({ ok: true });
  });
});