function textOf(node) {
  return ((node && (node.innerText || node.textContent || '')) || '').replace(/\s+/g, ' ').trim();
}

function attrsText(el) {
  if (!el || !el.attributes) return '';
  return Array.from(el.attributes).map((attr) => `${attr.name}=${attr.value}`).join(' ');
}

function isVisible(el) {
  if (!el || !el.getBoundingClientRect) return false;
  const rect = el.getBoundingClientRect();
  const style = window.getComputedStyle(el);
  return rect.width > 0 && rect.height > 0 && style.display !== 'none' && style.visibility !== 'hidden';
}

function walkRoots(root, rows, seen) {
  if (!root || seen.has(root)) return;
  seen.add(root);

  const walker = document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT);
  let node = walker.currentNode;
  while (node) {
    if (node.nodeType === Node.ELEMENT_NODE && node.tagName) rows.push(node);
    if (node.shadowRoot) walkRoots(node.shadowRoot, rows, seen);
    if ((node.tagName || '').toLowerCase() === 'slot' && node.assignedElements) {
      for (const assigned of node.assignedElements({ flatten: true })) {
        walkRoots(assigned, rows, seen);
      }
    }
    node = walker.nextNode();
  }
}

function allElements(root) {
  const rows = [];
  walkRoots(root || document, rows, new Set());
  return rows;
}

function clickElement(el) {
  el.scrollIntoView({ block: 'center', inline: 'nearest' });
  if (el.focus) el.focus();
  for (const eventName of ['pointerdown', 'mousedown', 'pointerup', 'mouseup']) {
    el.dispatchEvent(new MouseEvent(eventName, { bubbles: true, cancelable: true, view: window }));
  }
  el.click();
}

function clickTargetFor(el) {
  if (el && el.shadowRoot) {
    const button = el.shadowRoot.querySelector('button:not([disabled]), [role="button"]:not([disabled])');
    if (button) return button;
  }
  return el;
}

const modal = document.querySelector('kat-modal[data-testid="action-modal"]') ||
  allElements(document).find((el) => /删除|Delete/i.test(textOf(el)) && (el.tagName || '').toLowerCase() === 'kat-modal');

if (!modal) return { ok: false, reason: 'delete modal not found' };

const buttons = allElements(modal).filter((el) => {
  const haystack = `${el.tagName || ''} ${attrsText(el)} ${textOf(el)}`;
  return isVisible(el) && /kat-button|button/i.test(el.tagName || '') && /variant=primary|删除|确认|Delete|Confirm/i.test(haystack);
});
const button = buttons[0];

if (!button) {
  return {
    ok: false,
    reason: 'confirm button not found',
    modalText: textOf(modal),
    modalHTML: (modal.outerHTML || '').slice(0, 2000),
  };
}

const target = clickTargetFor(button);
clickElement(target);

return {
  ok: true,
  clicked: {
    tag: button.tagName,
    text: textOf(button),
    attrs: attrsText(button),
    targetTag: target.tagName,
  },
};