/*
 * Copyright 2000-2013 JetBrains s.r.o.
 * Copyright 2014-2014 AS3Boyan
 * Copyright 2014-2014 Elias Ku
 *
 * 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.plugins.haxe.codeInspection;

import com.intellij.codeInspection.*;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.io.FileUtilRt;
import com.intellij.plugins.haxe.HaxeBundle;
import com.intellij.plugins.haxe.nmml.NMMLFileType;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.XmlRecursiveElementVisitor;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlFile;
import com.intellij.psi.xml.XmlTag;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.List;

/**
 * @author: Fedor.Korotkov
 */
public class NMEBuildDirectoryInspection extends LocalInspectionTool {

  @Nls
  @NotNull
  @Override
  public String getGroupDisplayName() {
    return HaxeBundle.message("haxe.inspections.group.name");
  }

  @Nls
  @NotNull
  @Override
  public String getDisplayName() {
    return HaxeBundle.message("haxe.inspections.nme.build.directory");
  }

  @Override
  public ProblemDescriptor[] checkFile(@NotNull PsiFile file, @NotNull InspectionManager manager, boolean isOnTheFly) {
    final boolean isNmml = FileUtilRt.extensionEquals(file.getName(), NMMLFileType.DEFAULT_EXTENSION);
    if (!isNmml || !(file instanceof XmlFile)) {
      return ProblemDescriptor.EMPTY_ARRAY;
    }
    MyVisitor visitor = new MyVisitor();
    file.accept(visitor);

    if (ContainerUtil.exists(visitor.getResult(), new Condition<XmlTag>() {
      @Override
      public boolean value(XmlTag tag) {
        final XmlAttribute ifAttribute = tag.getAttribute("if");
        return "debug".equals(ifAttribute != null ? ifAttribute.getValue() : null);
      }
    })) {
      // all good
      return ProblemDescriptor.EMPTY_ARRAY;
    }

    final XmlTag lastTag = ContainerUtil.iterateAndGetLastItem(visitor.getResult());

    if (lastTag == null) {
      return ProblemDescriptor.EMPTY_ARRAY;
    }

    final ProblemDescriptor descriptor = manager.createProblemDescriptor(
      lastTag,
      HaxeBundle.message("haxe.inspections.nme.build.directory.descriptor"),
      new AddTagFix(),
      ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
      isOnTheFly
    );

    return new ProblemDescriptor[]{descriptor};
  }

  private static class MyVisitor extends XmlRecursiveElementVisitor {
    final List<XmlTag> myResult = new ArrayList<XmlTag>();

    public List<XmlTag> getResult() {
      return myResult;
    }

    @Override
    public void visitXmlTag(XmlTag tag) {
      super.visitXmlTag(tag);
      if ("set".equals(tag.getName())) {
        final XmlAttribute name = tag.getAttribute("name");
        if ("BUILD_DIR".equals(name != null ? name.getValue() : null)) {
          myResult.add(tag);
        }
      }
    }
  }

  private static class AddTagFix implements LocalQuickFix {
    @NotNull
    @Override
    public String getName() {
      return HaxeBundle.message("haxe.inspections.nme.build.directory.fix.name");
    }

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

    @Override
    public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
      final PsiElement element = descriptor.getPsiElement();
      assert element instanceof XmlTag;

      final XmlTag parentTag = ((XmlTag)element).getParentTag();
      final PsiElement debugTag = parentTag.addAfter(element.copy(), element);
      assert debugTag instanceof XmlTag;

      appendValue((XmlTag)element, "release");
      appendValue((XmlTag)debugTag, "debug");

      ((XmlTag)debugTag).setAttribute("if", "debug");
    }

    private void appendValue(XmlTag element, String release) {
      XmlAttribute outAttribute = ((XmlTag)element).getAttribute("value");
      if (outAttribute != null) {
        outAttribute.setValue(outAttribute.getValue() + "/" + release);
      }
    }
  }
}