/*
 * 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.idea.devkit.inspections;

import com.intellij.codeInspection.InspectionProfileEntry;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.*;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.idea.devkit.util.PsiUtil;

public class InspectionDescriptionInfo {

  private final String myFilename;
  private final PsiMethod myMethod;
  private final PsiFile myDescriptionFile;

  private InspectionDescriptionInfo(String filename, @Nullable PsiMethod method, @Nullable PsiFile descriptionFile) {
    myFilename = filename;
    myMethod = method;
    myDescriptionFile = descriptionFile;
  }

  public static InspectionDescriptionInfo create(Module module, PsiClass psiClass) {
    PsiMethod method = PsiUtil.findNearestMethod("getShortName", psiClass);
    if (method != null &&
        DescriptionType.INSPECTION.getClassName().equals(method.getContainingClass().getQualifiedName())) {
      method = null;
    }
    final String filename = method == null ?
                            InspectionProfileEntry.getShortName(psiClass.getName()) :
                            PsiUtil.getReturnedLiteral(method, psiClass);

    PsiFile descriptionFile = resolveInspectionDescriptionFile(module, filename);
    return new InspectionDescriptionInfo(filename, method, descriptionFile);
  }

  @Nullable
  private static PsiFile resolveInspectionDescriptionFile(Module module, @Nullable String filename) {
    if (filename == null) return null;

    for (PsiDirectory description : DescriptionCheckerUtil.getDescriptionsDirs(module, DescriptionType.INSPECTION)) {
      final PsiFile file = description.findFile(filename + ".html");
      if (file == null) continue;
      final VirtualFile vf = file.getVirtualFile();
      if (vf == null) continue;
      if (vf.getNameWithoutExtension().equals(filename)) {
        return PsiManager.getInstance(module.getProject()).findFile(vf);
      }
    }
    return null;
  }

  public boolean isValid() {
    return myFilename != null;
  }

  public String getFilename() {
    assert isValid();
    return myFilename;
  }

  @Nullable
  public PsiMethod getShortNameMethod() {
    return myMethod;
  }

  @Nullable
  public PsiFile getDescriptionFile() {
    return myDescriptionFile;
  }

  public boolean hasDescriptionFile() {
    return getDescriptionFile() != null;
  }
}