/*
 * Copyright 2000-2012 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.intellij.openapi.fileTypes;

import com.intellij.internal.statistic.AbstractApplicationUsagesCollector;
import com.intellij.internal.statistic.CollectUsagesException;
import com.intellij.internal.statistic.beans.GroupDescriptor;
import com.intellij.internal.statistic.beans.UsageDescriptor;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.psi.search.FileTypeIndex;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.util.NotNullFunction;
import com.intellij.util.ThreeState;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.indexing.FileBasedIndex;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.io.File;
import java.io.FilenameFilter;
import java.util.HashSet;
import java.util.Set;

/**
 * @author Nikolay Matveev
 */
public class FileTypeUsagesCollector extends AbstractApplicationUsagesCollector {

  private static final String GROUP_ID = "file-type";

  @NotNull
  @Override
  public GroupDescriptor getGroupId() {
    return GroupDescriptor.create(GROUP_ID);
  }

  @NotNull
  @Override
  public Set<UsageDescriptor> getProjectUsages(@NotNull final Project project) throws CollectUsagesException {
    final Set<FileType> usedFileTypes = new HashSet<FileType>();
    final FileTypeManager fileTypeManager = FileTypeManager.getInstance();
    if (fileTypeManager == null) {
      throw new CollectUsagesException("Cannot get instance of FileTypeManager");
    }
    final FileType[] registeredFileTypes = fileTypeManager.getRegisteredFileTypes();
    for (final FileType fileType : registeredFileTypes) {
      if (project.isDisposed()) {
        throw new CollectUsagesException("Project is disposed");
      }
      final String ideaDirPath = getIdeaDirPath(project.getBasePath());
      ApplicationManager.getApplication().runReadAction(new Runnable() {
        @Override
        public void run() {
          FileBasedIndex.getInstance().processValues(
            FileTypeIndex.NAME,
            fileType,
            null,
            new FileBasedIndex.ValueProcessor<Void>() {
              @Override
              public boolean process(VirtualFile file, Void value) {
                //skip files from .idea directory otherwise 99% of projects would have XML and PLAIN_TEXT file types
                if (ideaDirPath == null || FileUtil.isAncestorThreeState(ideaDirPath, file.getPath(), true) == ThreeState.NO) {
                  usedFileTypes.add(fileType);
                  return false;
                }
                return true;
              }
            }, GlobalSearchScope.projectScope(project));
        }
      });
    }
    return ContainerUtil.map2Set(usedFileTypes, new NotNullFunction<FileType, UsageDescriptor>() {
      @NotNull
      @Override
      public UsageDescriptor fun(FileType fileType) {
        return new UsageDescriptor(fileType.getName(), 1);
      }
    });
  }

  @Nullable
  private static String getIdeaDirPath(@Nullable String projectPath) {
    if (projectPath != null) {
      File projectDir = new File(projectPath);
      File[] ideaDirs = projectDir.listFiles(new FilenameFilter() {
        @Override
        public boolean accept(File dir, String name) {
          return Project.DIRECTORY_STORE_FOLDER.equals(name);
        }
      });
      if (ideaDirs.length == 1) {
        return ideaDirs[0].getPath();
      }
    }
    return null;
  }
}

@@ -1480,39 +1480,8 @@
 le;%0A
-import java.io.FilenameFilter;%0A
 impo
@@ -2517,22 +2517,8 @@
 ject
-.getBasePath()
 );%0A 
@@ -3701,30 +3701,30 @@
 h(@N
-ullable String
+otNull Project
  project
 Path
@@ -3723,20 +3723,16 @@
 ject
-Path
 ) %7B%0A    
 if (
@@ -3723,28 +3723,31 @@
 ject) %7B%0A    
-if (
+String 
 projectPath 
@@ -3750,319 +3750,188 @@
 ath 
-!
 = 
-null) %7B%0A      File projectDir = new File(project
+project.getBase
 Path
+(
 );%0A    
-  File%5B%5D ideaDirs = projectDir.listFiles(new FilenameFilter() %7B%0A        @Override%0A        public boolean accept(File dir, String name) %7B%0A          return Project.DIRECTORY_STORE_FOLDER.equals(name);%0A        %7D%0A      %7D);%0A      if (ideaDirs.length == 1
+if (projectPath != null) %7B%0A      String ideaDirPath = projectPath + %22/%22 + Project.DIRECTORY_STORE_FOLDER;%0A      if (new File(ideaDirPath).isDirectory()
 ) %7B%0A
@@ -3956,22 +3956,12 @@
 aDir
-s%5B0%5D.get
 Path
-()
 ;%0A  

use simple 'new File(path, file)' instead of 'listFiles(new FilenameFilter() {})' IDEA-COMMUNITY-CR-2368