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/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.fileupload.api;

import org.opencastproject.fileupload.api.exception.FileUploadException;
import org.opencastproject.fileupload.api.job.FileUploadJob;
import org.opencastproject.mediapackage.MediaPackage;
import org.opencastproject.mediapackage.MediaPackageElementFlavor;

import java.io.IOException;
import java.io.InputStream;

/**
 * Interface for a Service that manages upload jobs and receives and handles file parts.
 *
 */
public interface FileUploadService {

  /**
   * Returns true is a job with the given ID exists.
   *
   * @param id
   *          ID of the job in question
   * @return true if job exists, false otherwise
   */
  boolean hasJob(String id);

  /**
   * Creates a new upload job with the given metadata.
   *
   * @param filename
   *          name of the file to be uploaded
   * @param fileSize
   *          size of the file
   * @param chunkSize
   *          size of the file parts that will be uploaded
   * @param mp
   *          the mediapackage this file should belong to
   * @return FileUploadJob the job object
   * @throws FileUploadException
   */
  FileUploadJob createJob(String filename, long fileSize, int chunkSize, MediaPackage mp,
          MediaPackageElementFlavor flavor) throws FileUploadException;

  /**
   * Returns the upload job with the given ID, throws FileUploadException if the job can not be found.
   *
   * @param id
   *          ID of the upload job to retrieve
   * @return FileUploadJob the job object in question
   * @throws FileUploadException
   */
  FileUploadJob getJob(String id) throws FileUploadException;

  /**
   * Cleans outdated jobs on the file system
   */
  void cleanOutdatedJobs() throws IOException;

  /**
   * Deletes the job permanently, thus deleting persistent data.
   *
   * @param id
   *          ID of the upload job to delete
   * @throws FileUploadException
   */
  void deleteJob(String id) throws FileUploadException;

  /**
   * Appends the next part to the payload and updates the upload job accordingly.
   *
   * @param job
   *          the job object for the upload
   * @param chunk
   *          the number of the chunk being transfered
   * @param content
   *          the actual payload data
   * @throws FileUploadException
   */
  void acceptChunk(FileUploadJob job, long chunk, InputStream content) throws FileUploadException;

  /**
   * Returns an InputStream containing the data from the payload.
   *
   * @param job
   *          job to retrieve payload data from
   * @return InputStream the payload data
   * @throws FileUploadException
   */
  InputStream getPayload(FileUploadJob job) throws FileUploadException;

}