import fs from "node:fs";
import path from "node:path";
import { test, expect } from "@playwright/test";
import { FIXTURE_SUMMARY_NAME } from "./fixture-summary";

// A source-only build has no summary, and both pages must say so rather than
// draw zeroes. The e2e server always has the synthetic summary
// (fixture-summary.ts), so this file moves it aside, reads `/` and `/stats/`,
// and puts it back — `next dev` reads the file on every request (app/lib/
// summary.ts), and the suite runs one test at a time (`workers: 1`). The copy
// goes to a gitignored name beside it (`.e2e-summary.json*`), and it is
// restored however the test ends; playwright.config.ts also rewrites the file
// whenever a worker starts.

test.describe.configure({ mode: "serial" });

test("with no summary, / and /stats/ render no numbers and say why", async ({ page }) => {
  // `mode: "serial"` orders this file's tests, not the files: under
  // `--workers=N` (N > 1) the other specs run beside this one and read the
  // same summary file while it is moved aside, so they would draw the empty
  // state and fail. Only a one-worker run (the config's own) can check it.
  const workers = test.info().config.workers;
  test.skip(
    workers > 1,
    `no-data moves the shared e2e summary aside, which races the other specs when workers > 1 (this run: ${workers})`,
  );
  const file = path.resolve(test.info().project.testDir, FIXTURE_SUMMARY_NAME);
  const aside = `${file}.aside`;
  fs.renameSync(file, aside);
  try {
    await page.goto("/");
    // The claim without a count, the ways in, and none of the numbers.
    await expect(page.getByRole("heading", { level: 1 })).toHaveText(
      "Every word a channel said, searchable to the second.",
    );
    await expect(page.getByRole("link", { name: /download the source/i })).toBeVisible();
    await expect(page.getByRole("img", { name: /transcripts by the month/i })).toHaveCount(0);
    await expect(
      page.getByRole("heading", { level: 2, name: "Official Instances", exact: true }),
    ).toHaveCount(0);
    await expect(page.locator("time[datetime]")).toHaveCount(0);

    await page.goto("/stats/");
    await expect(page.getByText("This build shipped without dashboard data")).toBeVisible();
    await expect(page.locator(".recharts-surface")).toHaveCount(0);
  } finally {
    fs.renameSync(aside, file);
  }
  // Back: the next request draws the fixture's numbers again.
  await page.goto("/stats/");
  await expect(page.locator(".recharts-surface").first()).toBeVisible();
});