/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2002, 2005, 2006, 2008, 2012 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 "core/css/CSSPageRule.h"

#include "core/css/CSSSelector.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/PropertySetCSSStyleDeclaration.h"
#include "core/css/StylePropertySet.h"
#include "core/css/StyleRule.h"
#include "core/css/parser/CSSParser.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

CSSPageRule::CSSPageRule(StyleRulePage* pageRule, CSSStyleSheet* parent)
    : CSSRule(parent), m_pageRule(pageRule) {}

CSSPageRule::~CSSPageRule() {}

CSSStyleDeclaration* CSSPageRule::style() const {
  if (!m_propertiesCSSOMWrapper)
    m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(
        m_pageRule->mutableProperties(), const_cast<CSSPageRule*>(this));
  return m_propertiesCSSOMWrapper.get();
}

String CSSPageRule::selectorText() const {
  StringBuilder text;
  const CSSSelector* selector = m_pageRule->selector();
  if (selector) {
    String pageSpecification = selector->selectorText();
    if (!pageSpecification.isEmpty())
      text.append(pageSpecification);
  }
  return text.toString();
}

void CSSPageRule::setSelectorText(const String& selectorText) {
  CSSParserContext* context =
      CSSParserContext::create(parserContext(), nullptr);
  CSSSelectorList selectorList = CSSParser::parsePageSelector(
      context, parentStyleSheet() ? parentStyleSheet()->contents() : nullptr,
      selectorText);
  if (!selectorList.isValid())
    return;

  CSSStyleSheet::RuleMutationScope mutationScope(this);

  m_pageRule->wrapperAdoptSelectorList(std::move(selectorList));
}

String CSSPageRule::cssText() const {
  StringBuilder result;
  result.append("@page ");
  String pageSelectors = selectorText();
  result.append(pageSelectors);
  if (!pageSelectors.isEmpty())
    result.append(' ');
  result.append("{ ");
  String decls = m_pageRule->properties().asText();
  result.append(decls);
  if (!decls.isEmpty())
    result.append(' ');
  result.append('}');
  return result.toString();
}

void CSSPageRule::reattach(StyleRuleBase* rule) {
  ASSERT(rule);
  m_pageRule = toStyleRulePage(rule);
  if (m_propertiesCSSOMWrapper)
    m_propertiesCSSOMWrapper->reattach(m_pageRule->mutableProperties());
}

DEFINE_TRACE(CSSPageRule) {
  visitor->trace(m_pageRule);
  visitor->trace(m_propertiesCSSOMWrapper);
  CSSRule::trace(visitor);
}

}  // namespace blink