import assert from 'node:assert/strict';

export async function checkCellQueue(page) {
  const isBatch = request => request.method() === 'POST' && new URL(request.url()).pathname.endsWith('/cells/batch');
  const requests = [];
  const record = request => { if (isBatch(request)) requests.push(request); };
  const text = Array.from({length: 25}, (_, r) => Array.from({length: 20}, (_, c) => String(r * 20 + c + 1)).join('\t')).join('\n');
  await page.bringToFront();
  await page.evaluate(async text => navigator.clipboard.writeText(text), text);
  await page.locator('[data-sheet-grid] tbody tr:first-child td:nth-child(2)').click();
  await page.evaluate(() => { window.SheetsGrid.worksheet().updateSelectionFromCoords(0, 0, 0, 0); window.SheetsGrid.focus(); });
  page.on('request', record);
  try {
    const pasted = page.waitForRequest(isBatch);
    await page.keyboard.press('Control+v');
    await pasted;
    await page.evaluate(() => window.SheetsCellQueue([], window.SheetsGrid.post));
    assert.equal(requests.length, 1, 'paste must send one atomic request');
    assert.equal(requests[0].postDataJSON().cells.length, 500);
    await page.waitForFunction(() => window.SheetsGrid.rawAt(24, 19) === '500');
  } finally {
    page.off('request', record);
  }

  // Cut never writes. A failed paste leaves the source untouched.
  await page.evaluate(() => { window.SheetsGrid.worksheet().updateSelectionFromCoords(0, 0, 1, 1); window.SheetsGrid.focus(); });
  const cuts = [];
  const refuse = async route => {
    cuts.push(route.request().postDataJSON());
    await route.fulfill({status: 500, contentType: 'text/plain', body: ''});
  };
  await page.route('**/cells/batch', refuse);
  try {
    await page.keyboard.press('Control+x');
    await page.evaluate(() => window.SheetsCellQueue([], window.SheetsGrid.post));
    assert.equal(cuts.length, 0, 'cut must leave the source in place');
    await page.evaluate(() => { window.SheetsGrid.worksheet().updateSelectionFromCoords(3, 3, 3, 3); window.SheetsGrid.focus(); });
    const attempted = page.waitForRequest(isBatch);
    await page.keyboard.press('Control+v');
    await attempted;
    await page.evaluate(() => window.SheetsCellQueue([], window.SheetsGrid.post));
    assert.equal(cuts.length, 1, 'move must use one atomic batch');
    assert.equal(cuts[0].cells.length, 8);
    await page.waitForFunction(() => window.SheetsGrid.rawAt(0, 0) === '1' && window.SheetsGrid.rawAt(1, 1) === '22');
  } finally {
    await page.unroute('**/cells/batch', refuse);
  }
  return {pasteRequests: 1, pasteCells: 500, failedMoveRequests: 1, sourcePreserved: true};
}