// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "cobalt/cssom/style_sheet_list.h"

#include <limits>

#include "cobalt/cssom/cascade_precedence.h"
#include "cobalt/cssom/style_sheet.h"

namespace cobalt {
namespace cssom {

StyleSheetList::StyleSheetList() : mutation_observer_(NULL) {}

StyleSheetList::StyleSheetList(const StyleSheetVector& style_sheets,
                               MutationObserver* observer)
    : style_sheets_(style_sheets), mutation_observer_(observer) {
  int index = 0;
  for (StyleSheetVector::const_iterator iter = style_sheets_.begin();
       iter != style_sheets_.end(); ++iter) {
    StyleSheet* style_sheet = *iter;
    style_sheet->AttachToStyleSheetList(this);
    style_sheet->set_index(index++);
  }
}

scoped_refptr<StyleSheet> StyleSheetList::Item(unsigned int index) const {
  return index < style_sheets_.size() ? style_sheets_[index] : NULL;
}

unsigned int StyleSheetList::length() const {
  CHECK_LE(style_sheets_.size(), std::numeric_limits<unsigned int>::max());
  return static_cast<unsigned int>(style_sheets_.size());
}

void StyleSheetList::OnCSSMutation() {
  if (mutation_observer_) {
    mutation_observer_->OnCSSMutation();
  }
}

void StyleSheetList::TraceMembers(script::Tracer* tracer) {
  tracer->TraceItems(style_sheets_);
}

StyleSheetList::~StyleSheetList() {
  for (StyleSheetVector::const_iterator iter = style_sheets_.begin();
       iter != style_sheets_.end(); ++iter) {
    StyleSheet* style_sheet = *iter;
    if (style_sheet->ParentStyleSheetList() == this) {
      style_sheet->set_index(Appearance::kUnattached);
      style_sheet->DetachFromStyleSheetList();
    }
  }
}

}  // namespace cssom
}  // namespace cobalt