/*
 * 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.inspection;

import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.util.containers.ContainerUtil;
import org.intellij.erlang.ErlangFileType;
import org.intellij.erlang.psi.ErlangFile;
import org.intellij.erlang.psi.ErlangFunction;
import org.intellij.erlang.psi.ErlangImportFunction;
import org.intellij.erlang.psi.impl.ErlangPsiImplUtil;
import org.intellij.erlang.quickfixes.ErlangRemoveFunctionFix;
import org.intellij.erlang.quickfixes.ErlangRemoveFunctionFromImportFixBase;
import org.jetbrains.annotations.NotNull;

import java.util.Set;

public class ErlangDefiningImportedFunctionInspection extends ErlangInspectionBase {
  @Override
  protected boolean canRunOn(@NotNull ErlangFile file) {
    return file.getFileType() == ErlangFileType.MODULE && !file.isExportedAll();
  }

  protected void checkFile(@NotNull ErlangFile file, @NotNull ProblemsHolder problemsHolder) {
    Set<String> importedFunctionNames = ContainerUtil.newHashSet();
    for (ErlangImportFunction f : file.getImportedFunctions()) {
      importedFunctionNames.add(ErlangPsiImplUtil.createFunctionPresentation(f));
    }
    for (ErlangFunction function : file.getFunctions()) {
      String fullName = ErlangPsiImplUtil.createFunctionPresentation(function);
      if (importedFunctionNames.contains(fullName)) {
        problemsHolder.registerProblem(
          function.getNameIdentifier(),
          "Defining imported function '" + fullName + "'",
          ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
          new ErlangRemoveFunctionFix(),
          new ErlangRemoveFunctionFromImportFixBase.ErlangRemoveFunctionFromAllImportsFix());
      }
    }
  }
}