/*
 * Copyright 2015-2020 Alexandr Evstigneev
 *
 * 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.perl5.lang.perl.psi.references;

import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiElementResolveResult;
import com.intellij.psi.PsiFile;
import com.intellij.psi.ResolveResult;
import com.intellij.util.IncorrectOperationException;
import com.perl5.lang.perl.psi.PerlNamespaceElement;
import com.perl5.lang.perl.util.PerlPackageUtil;
import org.jetbrains.annotations.NotNull;

public class PerlNamespaceFileReference extends PerlCachingReference<PerlNamespaceElement> {
  public PerlNamespaceFileReference(PerlNamespaceElement psiElement) {
    super(psiElement);
  }

  public String getPackageName() {
    return myElement.getCanonicalName();
  }

  @Override
  protected @NotNull ResolveResult[] resolveInner(boolean incompleteCode) {
    PerlNamespaceElement myElement = getElement();
    PsiFile file = myElement.getContainingFile();
    PsiFile targetFile;

    targetFile = PerlPackageUtil.resolvePackageNameToPsi(file, getPackageName());

    return targetFile == null
           ? ResolveResult.EMPTY_ARRAY
           : new ResolveResult[]{new PsiElementResolveResult(targetFile)};
  }

  @Override
  public PsiElement handleElementRename(@NotNull String newElementName) throws IncorrectOperationException {
    String currentName = myElement.getCanonicalName();
    if (currentName != null && newElementName.endsWith(".pm")) {
      String[] nameChunks = currentName.split(PerlPackageUtil.NAMESPACE_SEPARATOR);
      nameChunks[nameChunks.length - 1] = newElementName.replaceFirst("\\.pm$", "");
      newElementName = StringUtil.join(nameChunks, PerlPackageUtil.NAMESPACE_SEPARATOR);

      return super.handleElementRename(newElementName);
    }

    throw new IncorrectOperationException("Can't bind package use/require to a non-pm file: " + newElementName);
  }

  @Override
  public PsiElement bindToElement(@NotNull PsiElement element) throws IncorrectOperationException {
    // fixme this is a stub to avoid exception
    return myElement;
  }
}
