/*
 * 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.inspections;

import com.goide.psi.GoElement;
import com.goide.psi.GoVisitor;
import com.goide.psi.impl.GoElementFactory;
import com.intellij.codeInspection.LocalInspectionToolSession;
import com.intellij.codeInspection.LocalQuickFixBase;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.codeInspection.ProblemsHolder;
import com.intellij.openapi.command.WriteCommandAction;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiErrorElement;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;

public class GoAddTrailingCommaInspection extends GoInspectionBase {
  public static final String QUICK_FIX_NAME = "Add comma";

  @NotNull
  @Override
  protected GoVisitor buildGoVisitor(@NotNull ProblemsHolder holder, @NotNull LocalInspectionToolSession session) {
    return new GoVisitor() {
      @Override
      public void visitErrorElement(PsiErrorElement o) {
        GoElement element = PsiTreeUtil.getPrevSiblingOfType(o, GoElement.class);
        if (element != null) {
          holder.registerProblem(element, "Need trailing comma before newline in composite literal", new MyAddCommaFix());
        }
      }
    };
  }

  private static class MyAddCommaFix extends LocalQuickFixBase {
    private MyAddCommaFix() {super(QUICK_FIX_NAME, QUICK_FIX_NAME);}

    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      PsiElement e = descriptor.getPsiElement();
      if (!(e instanceof GoElement)) return;
      PsiErrorElement error = PsiTreeUtil.getNextSiblingOfType(e, PsiErrorElement.class);
      if (error == null) return;
      new WriteCommandAction.Simple(project, getName(), e.getContainingFile()) {
        @Override
        protected void run() {
          error.replace(GoElementFactory.createComma(project));
        }
      }.execute();
    }
  }
}