/* Version history: the state before a write is kept, and restoring one brings
 * the old text back into the open editor without a reload. */
import {
  OUT,
  api,
  check,
  createNote,
  createNotebook,
  launch,
  report,
  setTitle,
  typeInEditor,
  withFreshUser,
} from "./lib.mjs";

const LONG = "Der ausführliche erste Entwurf, der später verloren gehen soll. ".repeat(6);

const browser = await launch();
let session;
try {
  session = await withFreshUser(browser, "hist");
  const p = session.page;
  await createNotebook(p, "Verlauf Buch");
  await createNote(p);
  await setTitle(p, "Mit Verlauf");

  await typeInEditor(p, LONG);
  check((await p.locator(".ProseMirror").innerText()).includes("erste Entwurf"), "the long draft is in the note");

  /* The note by its name, and not before the server has it.
   *
   * This used to take the first row of `/api/notes` the moment the text was
   * typed, which is two assumptions: that the first save had already landed, and
   * that the newest note is the one meant. Under load neither holds — the id
   * belonged to another note, and the version this suite is about was then
   * looked for in the wrong place. */
  const id = await p.evaluate(async () => {
    const mine = async () => {
      const r = await fetch("/api/notes", {
        headers: { Authorization: "Bearer " + localStorage.getItem("inknote_token") },
      });
      return (await r.json()).find((n) => n.title === "Mit Verlauf");
    };
    for (let tries = 0; tries < 20; tries++) {
      const note = await mine();
      if (note) return note.id;
      await new Promise((r) => setTimeout(r, 500));
    }
    return null;
  });
  check(!!id, "the note reached the server", String(id));

  /* Replace it with a stub. Shrinking a note by more than half is treated as a
   * large deletion and bypasses the 5-minute coalescing window, so a version is
   * kept immediately — exactly the case worth being able to undo. */
  await p.locator(".ProseMirror").click();
  await p.keyboard.press("Control+A");
  await p.keyboard.type("Kurz.");
  await p.waitForTimeout(3000);
  check((await p.locator(".ProseMirror").innerText()).trim().startsWith("Kurz"), "the note now shows the stub");

  const versions = await api(p, "GET", `/notes/${id}/versions`);
  check(versions.status === 200 && versions.body.length > 0, "a version was kept", `${versions.body?.length} versions`);
  check(
    versions.body.some((v) => v.reason === "large-deletion"),
    "the large deletion was recorded as such",
    JSON.stringify(versions.body?.map((v) => v.reason))
  );

  /* ── restore through the interface ── */
  await p.getByTitle("Version history").click();
  await p.waitForTimeout(1800);
  check((await p.locator("text=Restore this version").count()) > 0, "the history dialog opens");
  await p.screenshot({ path: `${OUT}/history-open.png` });

  const preview = await p.locator("text=erste Entwurf").count();
  check(preview > 0, "the preview shows the lost text");

  await p.getByRole("button", { name: "Restore this version" }).click();
  await p.waitForTimeout(2500);
  check((await p.locator("text=Restore this version").count()) === 0, "the dialog closed after restoring");
  check(
    (await p.locator(".ProseMirror").innerText()).includes("erste Entwurf"),
    "the editor shows the restored text without a reload"
  );

  /* ── and it really went to the server ── */
  await p.reload({ waitUntil: "networkidle" });
  await p.waitForTimeout(2500);
  await p.locator("button").filter({ hasText: "Mit Verlauf" }).first().click();
  await p.waitForSelector(".ProseMirror", { timeout: 15000 });
  await p.waitForTimeout(2000);
  check(
    (await p.locator(".ProseMirror").innerText()).includes("erste Entwurf"),
    "the restored text survived a reload"
  );

  /* Restoring is itself a change, so the stub must now be recoverable too. */
  const after = await api(p, "GET", `/notes/${id}/versions`);
  check(
    after.body.some((v) => v.reason === "before-restore"),
    "restoring kept a version of what it replaced",
    JSON.stringify(after.body?.map((v) => v.reason))
  );
  await p.screenshot({ path: `${OUT}/history-restored.png` });
} catch (e) {
  check(false, "suite ran to the end", e.message);
} finally {
  await session?.cleanup();
  const code = report();
  await browser.close();
  process.exit(code);
}