/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.
 */
package com.intellij.lang.html.structureView;

import com.intellij.icons.AllIcons;
import com.intellij.ide.IdeBundle;
import com.intellij.ide.structureView.StructureViewTreeElement;
import com.intellij.ide.structureView.impl.xml.XmlStructureViewTreeModel;
import com.intellij.ide.util.treeView.smartTree.*;
import com.intellij.openapi.editor.Editor;
import com.intellij.psi.xml.XmlFile;
import com.intellij.ui.PlaceHolder;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;

class HtmlStructureViewTreeModel extends XmlStructureViewTreeModel implements PlaceHolder<String> {

  private final Collection<NodeProvider> myNodeProviders;
  private String myStructureViewPlace;

  private static final Sorter HTML_ALPHA_SORTER = new Sorter() {
    @NotNull
    @Override
    public Comparator getComparator() {
      return new Comparator() {
        @Override
        public int compare(Object o1, Object o2) {
          String s1 = SorterUtil.getStringPresentation(o1);
          String s2 = SorterUtil.getStringPresentation(o2);

          if (isTagPresentation(s1, "head") && isTagPresentation(s2, "body")) return -1;
          if (isTagPresentation(s1, "body") && isTagPresentation(s2, "head")) return 1;

          return s1.compareToIgnoreCase(s2);
        }

        private boolean isTagPresentation(final String presentation, final String tagName) {
          // "head", "head#id", "head.cls"
          final String lowerCased = presentation.toLowerCase();
          return lowerCased.startsWith(tagName) &&
                 (lowerCased.length() == tagName.length() || !Character.isLetter(lowerCased.charAt(tagName.length())));
        }
      };
    }

    @Override
    public boolean isVisible() {
      return true;
    }

    public String toString() {
      return getName();
    }

    @Override
    @NotNull
    public ActionPresentation getPresentation() {
      return new ActionPresentationData(IdeBundle.message("action.sort.alphabetically"),
                                        IdeBundle.message("action.sort.alphabetically"),
                                        AllIcons.ObjectBrowser.Sorted);
    }

    @Override
    @NotNull
    public String getName() {
      return ALPHA_SORTER_ID;
    }
  };

  private static final Sorter[] ourSorters = {HTML_ALPHA_SORTER};

  public HtmlStructureViewTreeModel(final XmlFile file, @Nullable Editor editor) {
    super(file, editor);

    myNodeProviders = Arrays.<NodeProvider>asList(new Html5SectionsNodeProvider());
  }

  @Override
  public void setPlace(@NotNull final String place) {
    myStructureViewPlace = place;
  }

  @Override
  public String getPlace() {
    return myStructureViewPlace;
  }

  @Override
  @NotNull
  public Sorter[] getSorters() {
    if (TreeStructureUtil.isInStructureViewPopup(this)) {
      return Sorter.EMPTY_ARRAY;  // because in popup there's no option to disable sorter
    }

    return ourSorters;
  }

  @Override
  @NotNull
  public Collection<NodeProvider> getNodeProviders() {
    return myNodeProviders;
  }

  @Override
  @NotNull
  public StructureViewTreeElement getRoot() {
    return new HtmlFileTreeElement(TreeStructureUtil.isInStructureViewPopup(this), (XmlFile)getPsiFile());
  }
}