/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.codeInsight.editorActions.smartEnter;

import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.Editor;
import com.intellij.psi.JavaTokenType;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiLambdaExpression;
import com.intellij.psi.PsiSwitchLabeledRuleStatement;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;

public class MissingLambdaBodyFixer implements Fixer {

  @Override
  public void apply(Editor editor, JavaSmartEnterProcessor processor, @NotNull PsiElement psiElement) throws IncorrectOperationException {
    PsiElement body;
    if (psiElement instanceof PsiLambdaExpression lambda) {
      body = lambda.getBody();
    } else if (psiElement instanceof PsiSwitchLabeledRuleStatement rule) {
      body = rule.getBody();
    } else return;
    if (body != null) return;
    Document doc = editor.getDocument();
    PsiElement arrow = PsiTreeUtil.getDeepestVisibleLast(psiElement);
    if (!PsiUtil.isJavaToken(arrow, JavaTokenType.ARROW)) return;
    int offset = arrow.getTextRange().getEndOffset();
    doc.insertString(offset, "{\n}");
    editor.getCaretModel().moveToOffset(offset + 1);
    processor.commit(editor);
    processor.reformat(psiElement);
    processor.setSkipEnter(psiElement instanceof PsiLambdaExpression);
  }
}