/* Tables, and what happens to one at the edge of a sheet.
 *
 * The writing surface is drawn as separate sheets with a gap between them. Text
 * is pushed past that gap a block at a time, which is right for a paragraph and
 * wrong for a table: moved whole, a table either jumps to the next sheet leaving
 * the rest of this one blank, or — being longer than a sheet — has nowhere to
 * jump to and lies straight across the gap with a row cut in half.
 *
 * So the claim under test is that a long table is broken *between its rows*, and
 * that no row is left straddling a gap.
 */
import { OUT, check, createNote, createNotebook, launch, report, setTitle, withFreshUser } from "./lib.mjs";

/** Where each sheet sits, and therefore where the gaps are. */
const sheetBands = (page) =>
  page.evaluate(() =>
    [...document.querySelectorAll("[data-page-sheet]")].map((el) => {
      const r = el.getBoundingClientRect();
      return { top: r.top, bottom: r.bottom };
    })
  );

/** Every table row on screen, with the band it occupies. */
const rowBands = (page) =>
  page.evaluate(() =>
    [...document.querySelectorAll(".ProseMirror table tr:not(.ne-page-spacer-row)")].map((el) => {
      const r = el.getBoundingClientRect();
      return { top: r.top, bottom: r.bottom, text: el.textContent.trim().slice(0, 12) };
    })
  );

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

  await createNotebook(p, "Tabellen");
  await p.locator("button").filter({ hasText: "Tabellen" }).first().click();
  await p.waitForTimeout(700);
  await createNote(p);
  await setTitle(p, "Lange Tabelle");

  /* Enough text to push the table down the sheet, then a table long enough to
     run past the bottom of it — the two cases that used to go wrong. */
  await p.locator(".ProseMirror").click();
  for (let i = 0; i < 12; i++) {
    await p.keyboard.type(`Zeile ${i} vor der Tabelle. `);
    await p.keyboard.press("Enter");
  }
  await p.waitForTimeout(500);

  await p.locator("[data-table-menu] button").first().click();
  await p.waitForTimeout(400);
  await p.getByText("Insert 3 × 3 table", { exact: true }).click();
  await p.waitForTimeout(1200);
  check((await p.locator(".ProseMirror table").count()) === 1, "a table can be inserted");

  /* Rows are added from the menu on the table itself, which is also the thing
     Marc uses — and the labels there are English like the rest of the app. */
  await p.locator(".ProseMirror table td").first().click();
  await p.waitForTimeout(300);
  for (let i = 0; i < 26; i++) {
    await p.keyboard.type(`R${i}`);
    await p.locator(".ProseMirror table").click({ button: "right" });
    await p.waitForTimeout(220);
    await p.getByText("Insert row below", { exact: true }).click();
    await p.waitForTimeout(220);
  }
  await p.waitForTimeout(2500);

  check(
    (await p.locator("[data-submenu-toggle], [role=menu]").count()) >= 0 &&
      !/Kopfzeile|Zellen verbinden|Zelle teilen/.test(await p.locator("body").innerText()),
    "the table's own menu speaks the same language as the rest of the app"
  );

  const bands = await sheetBands(p);
  check(bands.length >= 2, "the table runs past the first sheet", `${bands.length} sheets`);

  const spacers = await p.locator("tr.ne-page-spacer-row").count();
  check(spacers >= 1, "the table is broken between its rows rather than moved whole", String(spacers));

  /* The point of it all: nothing is left lying across a gap. A row may end
     exactly on a sheet's edge — that is not a straddle — so a pixel of slack. */
  const rows = await rowBands(p);
  const gaps = bands.slice(0, -1).map((b, i) => ({ from: b.bottom, to: bands[i + 1].top }));
  const straddling = rows.filter((r) => gaps.some((g) => r.bottom > g.from + 1 && r.top < g.to - 1));
  check(
    straddling.length === 0,
    "and no row is left lying across the gap between two sheets",
    straddling.map((r) => r.text).join(", ")
  );

  await p.screenshot({ path: `${OUT}/tables-split.png`, fullPage: true });

  /* The header has to be legible on the dark theme, where the fill it had was a
     difference you could only find by looking for it. */
  // The table was inserted with a header row, so there is one to measure — the
  // menu entry toggles it *off*, which would leave nothing to look at.
  const header = await p.locator(".ProseMirror table th").first().evaluate((el) => {
    const cs = getComputedStyle(el);
    const cell = getComputedStyle(el.closest("table").querySelector("td") || el);
    return { head: cs.backgroundColor, body: cell.backgroundColor, rule: cs.borderBottomWidth };
  });
  check(
    header.head !== header.body && parseFloat(header.rule) >= 2,
    "a header row is filled differently from the body and underlined",
    JSON.stringify(header)
  );

  /* Written, nothing is lost: the spacers are decorations, so the body the
     server keeps has the table and no page furniture in it. */
  await p.waitForTimeout(2000);
  const body = await p.evaluate(async () => {
    const auth = { Authorization: "Bearer " + localStorage.getItem("inknote_token") };
    const notes = await (await fetch("/api/notes", { headers: auth })).json();
    const mine = notes.find((n) => n.title === "Lange Tabelle");
    return (await (await fetch(`/api/notes/${mine.id}`, { headers: auth })).json()).content;
  });
  check(!/ne-page-spacer/.test(body || ""), "and no page furniture reaches the stored note");
  check(/table/.test(body || ""), "which does hold the table itself", String(body || "").slice(0, 60));
} catch (e) {
  check(false, "suite ran to the end", e.message);
} finally {
  await session?.cleanup();
  const code = report();
  await browser.close();
  process.exit(code);
}