/*
 * Copyright 2000-2014 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 org.jetbrains.plugins.groovy.codeInspection.confusing;

import com.intellij.codeInspection.LocalQuickFix;
import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.codeInspection.ProblemHighlightType;
import com.intellij.codeInspection.ui.MultipleCheckboxOptionsPanel;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.SyntheticElement;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.GroovyBundle;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspection;
import org.jetbrains.plugins.groovy.codeInspection.BaseInspectionVisitor;
import org.jetbrains.plugins.groovy.codeInspection.GroovyInspectionBundle;
import org.jetbrains.plugins.groovy.codeInspection.GroovyQuickFixFactory;
import org.jetbrains.plugins.groovy.lang.psi.GrNamedElement;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFile;
import org.jetbrains.plugins.groovy.lang.psi.GroovyFileBase;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition;
import org.jetbrains.plugins.groovy.lang.psi.api.toplevel.GrTopStatement;
import org.jetbrains.plugins.groovy.lang.psi.api.toplevel.packaging.GrPackageDefinition;
import org.jetbrains.plugins.groovy.lang.resolve.ResolveUtil;

import javax.swing.*;

/**
 * @author Max Medvedev
 */
public class GrPackageInspection extends BaseInspection {
  public boolean myCheckScripts = true;

  @Override
  @Nls
  @NotNull
  public String getGroupDisplayName() {
    return CONFUSING_CODE_CONSTRUCTS;
  }

  @Override
  @Nls
  @NotNull
  public String getDisplayName() {
    return "Package name mismatch";
  }


  @Override
  @Nullable
  protected String buildErrorString(Object... args) {
    return "Package name mismatch";
  }

  @Nullable
  @Override
  public JComponent createOptionsPanel() {
    final MultipleCheckboxOptionsPanel optionsPanel = new MultipleCheckboxOptionsPanel(this);
    optionsPanel.addCheckbox(GroovyInspectionBundle.message("gr.package.inspection.check.scripts"), "myCheckScripts");
    return optionsPanel;

  }

  @NotNull
  @Override
  protected BaseInspectionVisitor buildVisitor() {
    return new BaseInspectionVisitor() {
      @Override
      public void visitFile(GroovyFileBase file) {
        if (!(file instanceof GroovyFile)) return;

        if (!myCheckScripts && file.isScript()) return;

        String expectedPackage = ResolveUtil.inferExpectedPackageName(file);
        String actual = file.getPackageName();
        if (!expectedPackage.equals(actual)) {

          PsiElement toHighlight = getElementToHighlight((GroovyFile)file);
          if (toHighlight == null) return;

          registerError(toHighlight, "Package name mismatch. Actual: '" + actual + "', expected: '" + expectedPackage+"'",
                        new LocalQuickFix[]{new ChangePackageQuickFix(expectedPackage), GroovyQuickFixFactory.getInstance().createGrMoveToDirFix(actual)},
                        ProblemHighlightType.GENERIC_ERROR_OR_WARNING);
        }
      }
    };
  }

  @Nullable
  private static PsiElement getElementToHighlight(GroovyFile file) {
    GrPackageDefinition packageDefinition = file.getPackageDefinition();
    if (packageDefinition != null) return packageDefinition;

    PsiClass[] classes = file.getClasses();
    for (PsiClass aClass : classes) {
      if (!(aClass instanceof SyntheticElement) && aClass instanceof GrTypeDefinition) {
        return ((GrTypeDefinition)aClass).getNameIdentifierGroovy();
      }
    }

    GrTopStatement[] statements = file.getTopStatements();
    if (statements.length > 0) {
      GrTopStatement first = statements[0];
      if (first instanceof GrNamedElement) return ((GrNamedElement)first).getNameIdentifierGroovy();

      return first;
    }

    return null;
  }

  /**
   * User: Dmitry.Krasilschikov
   * Date: 01.11.2007
   */
  public static class ChangePackageQuickFix implements LocalQuickFix {
    private final String myNewPackageName;

    public ChangePackageQuickFix(String newPackageName) {
      myNewPackageName = newPackageName;
    }

    @NotNull
    @Override
    public String getName() {
      return GroovyBundle.message("fix.package.name");
    }

    @Override
    @NotNull
    public String getFamilyName() {
      return GroovyBundle.message("fix.package.name");
    }

    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      PsiFile file = descriptor.getPsiElement().getContainingFile();
      ((GroovyFile)file).setPackageName(myNewPackageName);
    }
  }
}