/*
 * Copyright 2013-2016 Sergey Ignatov, Alexander Zolotov, Florin Patan
 *
 * 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.goide.go;

import com.goide.psi.GoNamedElement;
import com.intellij.navigation.ChooseByNameContributorEx;
import com.intellij.navigation.GotoClassContributor;
import com.intellij.navigation.NavigationItem;
import com.intellij.openapi.progress.ProgressManager;
import com.intellij.openapi.project.Project;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.stubs.StubIndex;
import com.intellij.psi.stubs.StubIndexKey;
import com.intellij.util.ArrayUtil;
import com.intellij.util.Processor;
import com.intellij.util.indexing.FindSymbolParameters;
import com.intellij.util.indexing.IdFilter;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class GoGotoContributorBase<T extends GoNamedElement> implements GotoClassContributor, ChooseByNameContributorEx {
  private final StubIndexKey<String, T>[] myIndexKeys;
  @NotNull private final Class<T> myClazz;

  @SafeVarargs
  public GoGotoContributorBase(@NotNull Class<T> clazz, @NotNull StubIndexKey<String, T>... key) {
    myIndexKeys = key;
    myClazz = clazz;
  }

  @NotNull
  @Override
  public String[] getNames(@NotNull Project project, boolean includeNonProjectItems) {
    return ArrayUtil.EMPTY_STRING_ARRAY;
  }

  @NotNull
  @Override
  public NavigationItem[] getItemsByName(String name, String pattern, Project project, boolean includeNonProjectItems) {
    return NavigationItem.EMPTY_NAVIGATION_ITEM_ARRAY;
  }

  @Override
  public void processNames(@NotNull Processor<String> processor, @NotNull GlobalSearchScope scope, IdFilter filter) {
    for (StubIndexKey<String, T> key : myIndexKeys) {
      ProgressManager.checkCanceled();
      StubIndex.getInstance().processAllKeys(key, processor, scope, filter);
    }
  }

  @Override
  public void processElementsWithName(@NotNull String s,
                                      @NotNull Processor<NavigationItem> processor,
                                      @NotNull FindSymbolParameters parameters) {
    for (StubIndexKey<String, T> key : myIndexKeys) {
      ProgressManager.checkCanceled();
      StubIndex.getInstance().processElements(key, s, parameters.getProject(), parameters.getSearchScope(), parameters.getIdFilter(), 
                                              myClazz, processor);
    }
  }
  
  @Nullable
  @Override
  public String getQualifiedName(NavigationItem item) {
    return item instanceof GoNamedElement ? ((GoNamedElement)item).getQualifiedName() : null;
  }

  @Nullable
  @Override
  public String getQualifiedNameSeparator() {
    return null;
  }
}