/*
 * Copyright 2000-2013 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.jetbrains.python.inspections.quickfix;

import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.util.Map;

public class PyAddPropertyForFieldQuickFix implements LocalQuickFix {
  private String myName = PyBundle.message("QFIX.add.property");

  public PyAddPropertyForFieldQuickFix(String name) {
    myName = name;
  }

  @NotNull
  public String getName() {
    return myName;
  }

  @NonNls
  @NotNull
  public String getFamilyName() {
    return getName();
  }

  public void applyFix(@NotNull final Project project, @NotNull final ProblemDescriptor descriptor) {
    final PsiElement element = descriptor.getPsiElement();
    if (element instanceof PyReferenceExpression) {
      final PsiReference reference = element.getReference();
      if (reference == null) return;
      final PsiElement resolved = reference.resolve();
      if (resolved instanceof PyTargetExpression) {
        PyTargetExpression target = (PyTargetExpression)resolved;
        final PyClass containingClass = target.getContainingClass();
        if (containingClass != null) {
          final String name = target.getName();
          if (name == null) return;
          String propertyName = StringUtil.trimStart(name, "_");
          final Map<String,Property> properties = containingClass.getProperties();
          final PyElementGenerator generator = PyElementGenerator.getInstance(project);
          if (!properties.containsKey(propertyName)) {
            final PyFunction property = generator.createProperty(LanguageLevel.forElement(containingClass), propertyName, name, AccessDirection.READ);
            PyUtil.addElementToStatementList(property, containingClass.getStatementList(), false);
          }
          final PyExpression qualifier = ((PyReferenceExpression)element).getQualifier();
          if (qualifier != null) {
            String newElementText = qualifier.getText() + "." + propertyName;
            final PyExpression newElement = generator.createExpressionFromText(LanguageLevel.forElement(containingClass), newElementText);
            element.replace(newElement);
          }
        }
      }
    }
  }
}