/*
 * Copyright 2000-2016 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.openapi.module.Module;
import com.intellij.openapi.module.ModuleUtilCore;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.JavaPsiFacade;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiDirectory;
import com.intellij.psi.PsiPackage;
import com.intellij.psi.search.GlobalSearchScope;
import com.intellij.psi.search.GlobalSearchScopesCore;
import one.util.streamex.StreamEx;
import org.jetbrains.annotations.Nullable;

import java.util.function.Supplier;

public class DescriptionCheckerUtil {
  public static StreamEx<GlobalSearchScope> searchScopes(Module module) {
    return StreamEx.<Supplier<GlobalSearchScope>>of(
      module::getModuleScope,
      module::getModuleWithDependenciesScope,
      () -> ModuleUtilCore.getAllDependentModules(module).stream().map(Module::getModuleContentWithDependenciesScope)
        .reduce(GlobalSearchScope::uniteWith).orElse(GlobalSearchScope.EMPTY_SCOPE),
      () -> GlobalSearchScopesCore.projectProductionScope(module.getProject())
    ).map(Supplier::get);
  }

  /**
   * Unlike getDescriptionsDirs this includes dirs in dependent modules and even project dirs ordered by
   * search scopes (first dirs in current module, then dirs in module dependencies, then dirs in
   * dependent modules, finally other project dirs).
   *
   * @param module module to search description directories for
   * @param descriptionType type of description directory to search
   * @return lazily populated stream of candidate directories
   */
  public static StreamEx<PsiDirectory> allDescriptionDirs(Module module, DescriptionType descriptionType) {
    final JavaPsiFacade javaPsiFacade = JavaPsiFacade.getInstance(module.getProject());
    final PsiPackage psiPackage = javaPsiFacade.findPackage(descriptionType.getDescriptionFolder());
    if (psiPackage == null) return StreamEx.empty();
    return searchScopes(module).flatMap(scope -> StreamEx.of(psiPackage.getDirectories(scope))).distinct();
  }

  public static PsiDirectory[] getDescriptionsDirs(Module module,
                                                   DescriptionType descriptionType) {
    final JavaPsiFacade javaPsiFacade = JavaPsiFacade.getInstance(module.getProject());
    final PsiPackage psiPackage = javaPsiFacade.findPackage(descriptionType.getDescriptionFolder());
    if (psiPackage != null) {
      return psiPackage.getDirectories(GlobalSearchScope.moduleWithDependenciesScope(module));
    }
    return PsiDirectory.EMPTY_ARRAY;
  }

  @Nullable
  public static String getDescriptionDirName(PsiClass aClass) {
    String descriptionDir = "";
    PsiClass each = aClass;
    while (each != null) {
      String name = each.getName();
      if (StringUtil.isEmptyOrSpaces(name)) {
        return null;
      }
      descriptionDir = name + descriptionDir;
      each = each.getContainingClass();
    }
    return descriptionDir;
  }
}

@@ -1262,24 +1262,65 @@
 e module) %7B%0A
+    // Try search in narrow scopes first%0A
     return S
@@ -1360,16 +1360,59 @@
 pe%3E%3Eof(%0A
+      () -%3E GlobalSearchScope.EMPTY_SCOPE,%0A
       mo
@@ -1785,16 +1785,101 @@
 er::get)
+%0A      .pairMap((prev, next) -%3E next.intersectWith(GlobalSearchScope.notScope(prev)))
 ;%0A  %7D%0A%0A 

exclude the previous scope from the next scope in chain