/*
 * 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.rename;

import com.intellij.psi.PsiElement;
import com.intellij.refactoring.listeners.RefactoringElementListener;
import com.intellij.refactoring.rename.RenamePsiElementProcessor;
import com.intellij.usageView.UsageInfo;
import com.intellij.util.IncorrectOperationException;
import org.intellij.erlang.psi.ErlangQVar;
import org.intellij.erlang.psi.impl.ErlangElementFactory;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public class ErlangRenameVariableProcessor extends RenamePsiElementProcessor {
  @Override
  public boolean canProcessElement(@NotNull PsiElement element) {
    return element instanceof ErlangQVar;
  }

  @Override
  public void renameElement(PsiElement element,
                            String newName,
                            UsageInfo[] usages,
                            @Nullable RefactoringElementListener listener) throws IncorrectOperationException {
    boolean variableNameIsInvalid;
    try {
      PsiElement qVarFromText = ErlangElementFactory.createQVarFromText(element.getProject(), newName);
      //noinspection ConstantConditions
      variableNameIsInvalid = qVarFromText == null;
    } catch (Exception any) {
      variableNameIsInvalid = true;
    }
    if (variableNameIsInvalid) {
      throw new IncorrectOperationException("Invalid variable name");
    }
    super.renameElement(element, newName, usages, listener);
  }
}