/* Editor: tables, task lists, links between notes, and whether any of it
 * survives a reload — the place where a stale server response used to eat
 * freshly typed content. */
import {
  OUT,
  api,
  check,
  createNote,
  createNotebook,
  insertTable,
  launch,
  reopenNote,
  report,
  setTitle,
  typeInEditor,
  withFreshUser,
} from "./lib.mjs";

const browser = await launch();
let session;
try {
  session = await withFreshUser(browser, "editor");
  const p = session.page;

  await createNotebook(p, "Editor Book");
  await createNote(p);
  await typeInEditor(p, "Grundtext");

  /* ── tables ── */
  await insertTable(p);
  check((await p.locator(".ProseMirror table").count()) > 0, "table inserted");
  check((await p.locator(".ProseMirror table th").count()) >= 3, "table has a header row");

  /* ── task list ── */
  await p.locator(".ProseMirror").click();
  await p.keyboard.press("Control+End");
  await p.keyboard.press("Enter");
  await p.getByTitle("Task list").click();
  await p.waitForTimeout(400);
  await p.keyboard.type("Milch kaufen");
  await p.waitForTimeout(1200);
  check((await p.locator('.ProseMirror input[type="checkbox"]').count()) > 0, "task list inserted");
  await p.locator('.ProseMirror input[type="checkbox"]').first().click();
  await p.waitForTimeout(1500);

  await p.screenshot({ path: `${OUT}/editor-content.png` });

  /* ── right-click menu on the table ── */
  const cellCount = () => p.locator(".ProseMirror table td, .ProseMirror table th").count();
  const before = await cellCount();
  await p.locator(".ProseMirror table td").first().click({ button: "right" });
  await p.waitForTimeout(600);
  check((await p.getByText("Insert row below").count()) > 0, "right-click in a table opens the table menu");
  check((await p.getByText("Delete table").count()) > 0, "and offers deleting the table");
  await p.screenshot({ path: `${OUT}/editor-table-menu.png` });

  await p.getByText("Insert row below").click();
  await p.waitForTimeout(1000);
  check((await cellCount()) > before, "the menu really added a row", `${before} → ${await cellCount()}`);

  const withRow = await cellCount();
  await p.locator(".ProseMirror table td").first().click({ button: "right" });
  await p.waitForTimeout(600);
  await p.getByText("Delete row").click();
  await p.waitForTimeout(1000);
  check((await cellCount()) < withRow, "and removing one works too", `${withRow} → ${await cellCount()}`);

  // Outside a table the browser's own menu must stay available.
  await p.locator(".ProseMirror p").first().click({ button: "right" });
  await p.waitForTimeout(500);
  check(
    (await p.getByText("Insert row below").count()) === 0,
    "right-click outside a table shows no table menu"
  );
  await p.keyboard.press("Escape");
  await p.waitForTimeout(400);

  /* ── a second note to link to ── */
  await setTitle(p, "Quelle");
  await createNote(p);
  await setTitle(p, "Ziel");
  await typeInEditor(p, "Ich bin das Ziel.");

  await p.locator("button").filter({ hasText: "Quelle" }).first().click();
  await p.waitForSelector(".ProseMirror", { timeout: 15000 });
  await p.waitForTimeout(1200);

  /* ── note link via the @ menu ── */
  // Control+End lands inside the task list, where a plain Enter would only make
  // another task. A second Enter on the empty item leaves the list, so the link
  // goes into a paragraph of its own and the checked task above stays untouched.
  await p.locator(".ProseMirror").click();
  await p.keyboard.press("Control+End");
  await p.keyboard.press("Enter");
  await p.keyboard.press("Enter");
  await p.waitForTimeout(300);
  await p.keyboard.type("@Ziel");
  await p.waitForTimeout(1400);
  const menuOpen = (await p.locator("text=Ziel").count()) > 0;
  check(menuOpen, "@ opens the link menu");
  await p.keyboard.press("Enter");
  await p.waitForTimeout(1800);

  const linkCount = await p.locator('.ProseMirror [data-note-link], .ProseMirror .note-link').count();
  check(linkCount > 0, "note link inserted into the document", `${linkCount} found`);
  await p.screenshot({ path: `${OUT}/editor-link.png` });

  /* ── the server learned about it ── */
  await p.waitForTimeout(1500);
  await p.locator("button").filter({ hasText: "Ziel" }).first().click();
  await p.waitForSelector(".ProseMirror", { timeout: 15000 });
  await p.waitForTimeout(2000);
  const backlink = await p.locator("text=Quelle").count();
  check(backlink > 0, "the target shows a backlink to the source");

  /* ── everything survives a cold reload ── */
  await reopenNote(p, "Quelle");
  check((await p.locator(".ProseMirror table").count()) > 0, "table survived a reload");
  check(
    (await p.locator('.ProseMirror [data-note-link], .ProseMirror .note-link').count()) > 0,
    "note link survived a reload"
  );
  check((await p.locator('.ProseMirror input[type="checkbox"]').count()) > 0, "task list survived a reload");
  check(
    (await p.locator('.ProseMirror input[type="checkbox"]:checked').count()) === 1,
    "the ticked task stayed ticked, and only that one"
  );
  check(
    (await p.locator(".ProseMirror li").filter({ hasText: "Ziel" }).count()) === 0,
    "the note link went into a paragraph, not into the task list"
  );
  check((await p.locator(".ProseMirror").innerText()).includes("Grundtext"), "plain text survived a reload");
  await p.screenshot({ path: `${OUT}/editor-after-reload.png` });
  /* ── how many pages the writing fills ── */
  // Pages are a reading aid, not a change to the document: the note stays one
  // body, and Markdown has no page. The height of one is the same 3:4 the canvas
  // uses, so "page 2" means the same thing writing or drawing.
  await createNote(p);
  await setTitle(p, "Langer Text");
  check(
    (await p.locator("[data-note-position]").innerText()).includes("of 1"),
    "a fresh note is one page",
    await p.locator("[data-note-position]").innerText()
  );

  await p.locator(".ProseMirror").click();
  // Enough for several pages. With only two, the middle of the window never
  // leaves the first one — a window is shorter than a page — so the check would
  // be testing arithmetic rather than behaviour.
  for (let i = 0; i < 220; i++) {
    await p.keyboard.type(`Absatz ${i + 1}: Dichtungen altern durch Wärme.`);
    await p.keyboard.press("Enter");
  }
  await p.waitForTimeout(3500);

  const position = () => p.locator("[data-note-position]").innerText();
  const scrollTo = async (fraction) => {
    await p.evaluate((f) => {
      const pm = document.querySelector(".ProseMirror");
      let el = pm.parentElement;
      while (el && getComputedStyle(el).overflowY !== "auto") el = el.parentElement;
      el.scrollTop = (el.scrollHeight - el.clientHeight) * f;
    }, fraction);
    await p.waitForTimeout(900);
    return position();
  };

  const total = Number((await position()).match(/of (\d+)/)?.[1] || 0);
  check(total > 2, "writing past the end of a page makes more of them", await position());
  check(
    (await p.locator("[data-note-position]").count()) === 1,
    "and the count is shown the way the PDF reader shows it"
  );

  check((await scrollTo(0)).startsWith("Page 1"), "at the top it says page one", await position());
  const nearEnd = await scrollTo(0.9);
  check(
    Number(nearEnd.match(/Page (\d+)/)[1]) > 1,
    "scrolling down moves the count on",
    nearEnd
  );

  /* ── the paper ──
   * Each page is a sheet of its own with a gap after it, the way the PDF reader
   * draws its pages. The gap is the part that has to be got right: the browser
   * knows nothing about our sheets and would lay a line of text straight across
   * it, so the text flow holds it open — see editor/pagination.js. */
  check(
    (await p.locator("[data-page-sheet]").count()) === Number((await position()).match(/of (\d+)/)[1]),
    "there is a sheet of paper for every page",
    `${await p.locator("[data-page-sheet]").count()} sheets, ${await position()}`
  );
  const straddling = await p.evaluate(() => {
    const pm = document.querySelector(".ProseMirror");
    const top = pm.getBoundingClientRect().top;
    const sheets = [...document.querySelectorAll("[data-page-sheet]")].map((el) => el.getBoundingClientRect());
    const gaps = sheets.slice(0, -1).map((r, i) => ({ from: r.bottom - top, to: sheets[i + 1].top - top }));
    const bad = [];
    for (const el of pm.children) {
      if (el.classList.contains("ne-page-spacer")) continue;
      const r = el.getBoundingClientRect();
      if (r.height === 0) continue;
      for (const g of gaps) {
        if (r.bottom - top > g.from + 0.5 && r.top - top < g.to - 0.5) bad.push((el.textContent || "").slice(0, 30));
      }
    }
    return bad;
  });
  check(straddling.length === 0, "and no line of text is cut in half by a gap", straddling.join(" | "));
  check(
    (await p.locator(".ne-page-spacer").count()) > 0,
    "which takes holding the gap open inside the text itself"
  );
  /* The placeholder extension styles `[contenteditable]:empty::before`, and a
   * spacer is exactly that. "Start writing..." was printed at the foot of every
   * page that had a break after it. */
  check(
    await p.evaluate(() =>
      [...document.querySelectorAll(".ne-page-spacer")].every(
        (el) => getComputedStyle(el, "::before").content === "none"
      )
    ),
    "and the gap stays blank — no placeholder printed at the foot of the page"
  );

  /* The note is still one document — pages are drawn, not stored. */
  const stored = (await api(p, "GET", "/notes")).body[0];
  const body = (await api(p, "GET", `/notes/${stored.id}`)).body.content;
  check(!/"type"\s*:\s*"page"/.test(body), "no page ever reaches the stored document");
  check(!/page-spacer/.test(body), "and neither does anything holding a gap open");

  /* ── alignment ── */
  // Left is the default and is never written into the document, so an untouched
  // paragraph reads as left without carrying an attribute for it.
  await createNote(p);
  await setTitle(p, "Ausrichtung");
  await typeInEditor(p, "Diese Zeile wandert.");
  check(
    (await p.locator('[data-align="left"]').count()) === 1,
    "the toolbar offers alignment"
  );

  await p.locator('[data-align="center"]').click();
  await p.waitForTimeout(1800);
  check(
    (await p.locator(".ProseMirror p").first().evaluate((e) => getComputedStyle(e).textAlign)) === "center",
    "choosing centre centres the paragraph"
  );

  await reopenNote(p, "Ausrichtung");
  check(
    (await p.locator(".ProseMirror p").first().evaluate((e) => getComputedStyle(e).textAlign)) === "center",
    "and it survives a reload, so it is in the document and not on the screen"
  );

  const alignedBody = (await api(p, "GET", "/notes")).body;
  const alignedNote = alignedBody.find((n) => n.title === "Ausrichtung");
  const alignedContent = (await api(p, "GET", `/notes/${alignedNote.id}`)).body.content;
  check(/"textAlign"\s*:\s*"center"/.test(alignedContent), "stored on the paragraph itself");

  await p.locator('[data-align="left"]').click();
  await p.waitForTimeout(1800);
  check(
    (await p.locator(".ProseMirror p").first().evaluate((e) => getComputedStyle(e).textAlign)) === "start",
    "and going back to left leaves no alignment behind",
    await p.locator(".ProseMirror p").first().evaluate((e) => getComputedStyle(e).textAlign)
  );

  /* ── the typeface follows the account ── */
  await p.getByTitle("Account").click();
  await p.waitForTimeout(800);
  await p.locator('[data-note-font="mono"]').click();
  await p.waitForTimeout(1500);
  await p.keyboard.press("Escape");
  await p.waitForTimeout(1200);
  check(
    /mono/i.test(await p.locator(".ProseMirror").evaluate((e) => getComputedStyle(e).fontFamily)),
    "choosing a typeface changes the note text",
    await p.locator(".ProseMirror").evaluate((e) => getComputedStyle(e).fontFamily)
  );

  // On the account, not in this browser — so it is there on the next device.
  const me = await api(p, "GET", "/auth/me");
  check(me.body?.preferences?.noteFont === "mono", "and is stored on the account", JSON.stringify(me.body?.preferences));

  await p.reload({ waitUntil: "networkidle" });
  await p.waitForTimeout(3000);
  // A reload lands on the dashboard, so the notebook has to be opened again.
  await p.locator("button").filter({ hasText: "Editor Book" }).first().click();
  await p.waitForTimeout(1500);
  await p.locator("[data-note-row]").first().click();
  await p.waitForTimeout(2500);
  check(
    /mono/i.test(await p.locator(".ProseMirror").evaluate((e) => getComputedStyle(e).fontFamily)),
    "and survives a reload"
  );

} catch (e) {
  check(false, "suite ran to the end", e.message);
} finally {
  await session?.cleanup();
  const code = report();
  await browser.close();
  process.exit(code);
}