/*
 * Copyright 2000-2011 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.psi.search;

import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiFile;
import org.jetbrains.annotations.NotNull;

/**
 * @author irengrig
 *         Date: 2/24/11
 *         Time: 10:08 AM
 */
public interface PsiTodoSearchHelper {
  class SERVICE {
    private SERVICE() {
    }

    public static PsiTodoSearchHelper getInstance(Project project) {
      return ServiceManager.getService(project, PsiTodoSearchHelper.class);
    }
  }

  /**
   * Returns the list of all files in the project which have to do items.
   *
   * @return the list of files with to do items.
   */
  @NotNull
  PsiFile[] findFilesWithTodoItems();

  /**
   * Searches the specified file for to do items.
   *
   * @param file the file to search for to do items.
   * @return the array of found items.
   */
  @NotNull
  TodoItem[] findTodoItems(@NotNull PsiFile file);

  /**
   * Searches the specified range of text in the specified file for to do items.
   *
   * @param file        the file to search for to do items.
   * @param startOffset the start offset of the text range to search to do items in.
   * @param endOffset   the end offset of the text range to search to do items in.
   * @return the array of found items.
   */
  @NotNull
  TodoItem[] findTodoItems(@NotNull PsiFile file, int startOffset, int endOffset);

  @NotNull
  TodoItem[] findTodoItemsLight(@NotNull PsiFile file);
  @NotNull
  TodoItem[] findTodoItemsLight(@NotNull PsiFile file, int startOffset, int endOffset);

  /**
   * Returns the number of to do items in the specified file.
   *
   * @param file the file to return the to do count for.
   * @return the count of to do items in the file.
   */
  int getTodoItemsCount(@NotNull PsiFile file);

  /**
   * Returns the number of to do items matching the specified pattern in the specified file.
   *
   * @param file    the file to return the to do count for.
   * @param pattern the pattern of to do items to find.
   * @return the count of to do items in the file.
   */
  int getTodoItemsCount(@NotNull PsiFile file, @NotNull TodoPattern pattern);
}
