/*
 * Copyright 2010-2014 Bas Leijdekkers
 *
 * 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.siyeh.ipp.annotation;

import com.intellij.openapi.editor.CaretModel;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.siyeh.IntentionPowerPackBundle;
import com.siyeh.ipp.base.MutablyNamedIntention;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;

public class ExpandToNormalAnnotationIntention extends MutablyNamedIntention {

  @Override
  protected String getTextForElement(PsiElement element) {
    final PsiNameValuePair annotation = (PsiNameValuePair)element;
    final String text = buildReplacementText(annotation);
    return IntentionPowerPackBundle.message(
      "expand.to.normal.annotation.name", text);
  }

  @NotNull
  @Override
  protected PsiElementPredicate getElementPredicate() {
    return new ExpandToNormalAnnotationPredicate();
  }

  public static String buildReplacementText(PsiNameValuePair attribute) {
    final StringBuilder text = new StringBuilder();
    final PsiAnnotationMemberValue value = attribute.getValue();
    text.append("value = ");
    if (value != null) {
      text.append(value.getText());
    }
    return text.toString();
  }

  @Override
  protected void processIntention(@NotNull PsiElement element) {
    final PsiNameValuePair attribute = (PsiNameValuePair)element;
    final int textOffset = attribute.getTextOffset();
    final Project project = attribute.getProject();
    final String text = buildReplacementText(attribute);
    final PsiElementFactory factory = JavaPsiFacade.getElementFactory(project);
    final PsiAnnotation newAnnotation = factory.createAnnotationFromText("@A(" + text +" )", attribute);
    final PsiAnnotationParameterList parent = (PsiAnnotationParameterList)attribute.getParent();
    for (PsiElement child = parent.getFirstChild(); child != null; child = child.getNextSibling()) {
      if (child instanceof PsiErrorElement) {
        child.delete();
        break;
      }
    }
    attribute.replace(newAnnotation.getParameterList().getAttributes()[0]);
    final FileEditorManager editorManager = FileEditorManager.getInstance(project);
    final Editor editor = editorManager.getSelectedTextEditor();
    if (editor == null) {
      return;
    }
    final CaretModel caretModel = editor.getCaretModel();
    caretModel.moveToOffset(textOffset + text.length() - 1);
  }
}