/*
 * Copyright 2012-2014 Sergey Ignatov
 *
 * 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 org.intellij.erlang.psi.impl;

import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReferenceBase;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.ArrayUtil;
import com.intellij.util.IncorrectOperationException;
import com.intellij.util.ObjectUtils;
import com.intellij.util.containers.ContainerUtil;
import org.intellij.erlang.psi.ErlangFile;
import org.intellij.erlang.psi.ErlangMacrosDefinition;
import org.intellij.erlang.psi.ErlangMacrosName;
import org.jetbrains.annotations.NotNull;

public class ErlangMacrosReferenceImpl extends PsiReferenceBase<ErlangMacrosName> {
  private final String myReferenceName;

  public ErlangMacrosReferenceImpl(ErlangMacrosName element) {
    super(element, ErlangPsiImplUtil.getTextRangeForReference(element));
    myReferenceName = ErlangPsiImplUtil.getNameIdentifier(element).getText();
  }

  @Override
  public PsiElement handleElementRename(String newElementName) throws IncorrectOperationException {
    ErlangPsiImplUtil.setName(myElement, newElementName);
    return myElement;
  }

  @Override
  public PsiElement resolve() {
    ErlangMacrosDefinition definition = PsiTreeUtil.getParentOfType(myElement, ErlangMacrosDefinition.class);
    if (definition != null && definition.getMacrosName() == myElement) return null;

    PsiFile containingFile = myElement.getContainingFile();
    if (containingFile instanceof ErlangFile) {
      ErlangMacrosDefinition macros = ((ErlangFile) containingFile).getMacros(myReferenceName);
      if (macros != null) {
        return macros;
      }
      return ContainerUtil.getFirstItem(ErlangPsiImplUtil.getErlangMacrosFromIncludes((ErlangFile) containingFile, false, myReferenceName));
    }
    return null;
  }

  @NotNull
  @Override
  public Object[] getVariants() {
    return ArrayUtil.toObjectArray(ErlangPsiImplUtil.getMacrosLookupElements(myElement.getContainingFile()));
  }

  @Override
  public boolean isReferenceTo(PsiElement element) {
    ErlangMacrosDefinition definition = ObjectUtils.tryCast(element, ErlangMacrosDefinition.class);
    String macroName = definition != null ? definition.getName() : null;
    return macroName != null && macroName.equals(myReferenceName) && definition.getMacrosName() != myElement;
  }
}