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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.iceberg.actions;

import java.util.concurrent.ExecutorService;
import java.util.function.Consumer;
import org.apache.iceberg.io.FileIO;

/**
 * An action that deletes all files referenced by a table metadata file.
 * 
 * This action will irreversibly delete all reachable files such as data files, manifests,
 * manifest lists and should be used to clean up the underlying storage once a table is dropped
 * and no longer needed.
 * 

 * Implementations may use a query engine to distribute parts of work.
 */
public interface DeleteReachableFiles extends Action {

  /**
   * Passes an alternative delete implementation that will be used for files.
   *
   * @param deleteFunc a function that will be called to delete files.
   *                   The function accepts path to file as an argument.
   * @return this for method chaining
   */
  DeleteReachableFiles deleteWith(Consumer deleteFunc);

  /**
   * Passes an alternative executor service that will be used for files removal.
   * 
   * If this method is not called, files will be deleted in the current thread.
   *
   *  @param executorService the service to use
   * @return this for method chaining
   */
  DeleteReachableFiles executeDeleteWith(ExecutorService executorService);

  /**
   * Set the {@link FileIO} to be used for files removal
   *
   * @param io FileIO to use for files removal
   * @return this for method chaining
   */
  DeleteReachableFiles io(FileIO io);

  /**
   * The action result that contains a summary of the execution.
   */
  interface Result {

    /**
     * Returns the number of deleted data files.
     */
    long deletedDataFilesCount();

    /**
     * Returns the number of deleted manifests.
     */
    long deletedManifestsCount();

    /**
     * Returns the number of deleted manifest lists.
     */
    long deletedManifestListsCount();

    /**
     * Returns the number of deleted metadata json, version hint files.
     */
    long deletedOtherFilesCount();
  }
}