/*
 * Copyright (C) 1997 Martin Jones (mjones@kde.org)
 *           (C) 1997 Torben Weis (weis@kde.org)
 *           (C) 1998 Waldo Bastian (bastian@kde.org)
 *           (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights
 * reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "third_party/blink/renderer/core/html/html_table_row_element.h"

#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/dom/node_lists_node_data.h"
#include "third_party/blink/renderer/core/html/html_collection.h"
#include "third_party/blink/renderer/core/html/html_table_cell_element.h"
#include "third_party/blink/renderer/core/html/html_table_element.h"
#include "third_party/blink/renderer/core/html/html_table_rows_collection.h"
#include "third_party/blink/renderer/core/html/html_table_section_element.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/heap/heap.h"

namespace blink {

HTMLTableRowElement::HTMLTableRowElement(Document& document)
    : HTMLTablePartElement(html_names::kTrTag, document) {}

bool HTMLTableRowElement::HasLegalLinkAttribute(
    const QualifiedName& name) const {
  return name == html_names::kBackgroundAttr ||
         HTMLTablePartElement::HasLegalLinkAttribute(name);
}

const QualifiedName& HTMLTableRowElement::SubResourceAttributeName() const {
  return html_names::kBackgroundAttr;
}

static int FindIndexInRowCollection(const HTMLCollection& rows,
                                    const HTMLTableRowElement& target) {
  Element* candidate = rows.item(0);
  for (int i = 0; candidate; i++, candidate = rows.item(i)) {
    if (target == candidate)
      return i;
  }
  return -1;
}

int HTMLTableRowElement::rowIndex() const {
  ContainerNode* maybe_table = parentNode();
  if (maybe_table && IsA<HTMLTableSectionElement>(maybe_table)) {
    // Skip THEAD, TBODY and TFOOT.
    maybe_table = maybe_table->parentNode();
  }
  auto* html_table_element = DynamicTo<HTMLTableElement>(maybe_table);
  if (!html_table_element)
    return -1;
  return FindIndexInRowCollection(*html_table_element->rows(), *this);
}

int HTMLTableRowElement::sectionRowIndex() const {
  ContainerNode* maybe_table = parentNode();
  if (!maybe_table)
    return -1;
  HTMLCollection* rows = nullptr;
  if (auto* section = DynamicTo<HTMLTableSectionElement>(maybe_table))
    rows = section->rows();
  else if (auto* table = DynamicTo<HTMLTableElement>(maybe_table))
    rows = table->rows();
  if (!rows)
    return -1;
  return FindIndexInRowCollection(*rows, *this);
}

HTMLElement* HTMLTableRowElement::insertCell(int index,
                                             ExceptionState& exception_state) {
  HTMLCollection* children = cells();
  int num_cells = children ? children->length() : 0;
  if (index < -1 || index > num_cells) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kIndexSizeError,
        "The value provided (" + String::Number(index) +
            ") is outside the range [-1, " + String::Number(num_cells) + "].");
    return nullptr;
  }

  auto* cell = MakeGarbageCollected<HTMLTableCellElement>(html_names::kTdTag,
                                                          GetDocument());
  if (num_cells == index || index == -1)
    AppendChild(cell, exception_state);
  else
    InsertBefore(cell, children->item(index), exception_state);
  return cell;
}

void HTMLTableRowElement::deleteCell(int index,
                                     ExceptionState& exception_state) {
  HTMLCollection* children = cells();
  int num_cells = children ? children->length() : 0;
  // 1. If index is less than −1 or greater than or equal to the number of
  // elements in the cells collection, then throw "IndexSizeError".
  if (index < -1 || index >= num_cells) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kIndexSizeError,
        "The value provided (" + String::Number(index) +
            ") is outside the range [0, " + String::Number(num_cells) + ").");
    return;
  }
  // 2. If index is −1, remove the last element in the cells collection
  // from its parent, or do nothing if the cells collection is empty.
  if (index == -1) {
    if (num_cells == 0)
      return;
    index = num_cells - 1;
  }
  // 3. Remove the indexth element in the cells collection from its parent.
  Element* cell = children->item(index);
  HTMLElement::RemoveChild(cell, exception_state);
}

HTMLCollection* HTMLTableRowElement::cells() {
  return EnsureCachedCollection<HTMLCollection>(kTRCells);
}

}  // namespace blink