import { readFile, writeFile } from "node:fs/promises";
import { test, expect } from "@playwright/test";
import { resolvePath } from "./helpers";

// This spec drives a flow that REWRITES a changelog file and can make a real
// git commit. It used to point at the repo's own tracked editor/CHANGELOG.md,
// which meant: a failed run left the working tree dirty, a successful run left
// a stray "Release editor <version>" commit on the current branch, and the run
// failed outright whenever the tree was already dirty (the action refuses to
// commit over unrelated changes).
//
// It now targets editor/test-changelog.md — disposable, gitignored, and pointed
// at by EDITOR_CHANGELOG_FILE in the dev:test/start:test scripts, which is the
// same file the /changelog page reads (common/lib/paths.ts editorChangelogFile).
// "Commit changelog" is unchecked in every test below: none of them assert
// anything about git, and leaving it on would try to `git add` an ignored file.
const CHANGELOG_PATH = resolvePath("test-changelog.md");

const WITH_UNRELEASED =
  "# Changelog\n" +
  "\n" +
  "## [Unreleased]\n" +
  "- test bullet for cut-release spec\n" +
  "\n" +
  "## [9.9.9] - 2024-01-01\n" +
  "- old released bullet\n";

const WITHOUT_UNRELEASED =
  "# Changelog\n" +
  "\n" +
  "## [9.9.9] - 2024-01-01\n" +
  "- old released bullet\n";

function todayISO(): string {
  const now = new Date();
  const y = now.getFullYear().toString().padStart(4, "0");
  const m = (now.getMonth() + 1).toString().padStart(2, "0");
  const d = now.getDate().toString().padStart(2, "0");
  return `${y}-${m}-${d}`;
}

// Leave a valid changelog behind: /changelog reads this file unconditionally.
test.afterEach(async () => {
  await writeFile(CHANGELOG_PATH, WITHOUT_UNRELEASED);
});

// The form defaults "Commit changelog" to checked; these tests only care about
// the file rewrite and the form state, so turn it off.
async function uncheckCommit(page: import("@playwright/test").Page) {
  await page.getByRole("checkbox", { name: "Commit changelog" }).uncheck();
}

test("cutting a release removes the Unreleased heading from the file", async ({
  page,
}) => {
  await writeFile(CHANGELOG_PATH, WITH_UNRELEASED);

  await page.goto("/changelog");
  await page.locator("#version-editor").fill("9.9.10");
  await uncheckCommit(page);
  await page.getByRole("button", { name: /^cut release$/i }).click();

  await expect(
    page.getByRole("status").filter({ hasText: "Cut release 9.9.10." }),
  ).toBeVisible();

  const after = await readFile(CHANGELOG_PATH, "utf8");
  expect(after).toContain(`## [9.9.10] - ${todayISO()}`);
  expect(after).not.toMatch(/^##\s+\[Unreleased\]/im);
  expect(after).toContain("## [9.9.9] - 2024-01-01");
  expect(after).toContain("- test bullet for cut-release spec");
});

test("form disables after a successful cut on reload", async ({ page }) => {
  await writeFile(CHANGELOG_PATH, WITH_UNRELEASED);

  await page.goto("/changelog");
  await page.locator("#version-editor").fill("9.9.10");
  await uncheckCommit(page);
  await page.getByRole("button", { name: /^cut release$/i }).click();
  await expect(
    page.getByRole("status").filter({ hasText: "Cut release 9.9.10." }),
  ).toBeVisible();

  await page.goto("/changelog");
  await expect(page.locator("#version-editor")).toBeDisabled();
  await expect(
    page.getByRole("button", { name: /^cut release$/i }),
  ).toBeDisabled();
  await expect(
    page.getByText("Nothing pending under [Unreleased] yet."),
  ).toBeVisible();
});

test("form is disabled when the file has no Unreleased heading", async ({
  page,
}) => {
  await writeFile(CHANGELOG_PATH, WITHOUT_UNRELEASED);

  await page.goto("/changelog");
  await expect(page.locator("#version-editor")).toBeDisabled();
  await expect(
    page.getByRole("button", { name: /^cut release$/i }),
  ).toBeDisabled();
  await expect(
    page.getByText("Nothing pending under [Unreleased] yet."),
  ).toBeVisible();
});