/*
    * Copyright (C) 2015, Sasa Zivkov <sasa.zivkov@sap.com>
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
   *   products derived from this software without specific prior
   *   written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package org.eclipse.jgit.lfs.server;
  
  import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
  import static org.eclipse.jgit.lfs.lib.Constants.DOWNLOAD;
  import static org.eclipse.jgit.lfs.lib.Constants.UPLOAD;
  import static org.eclipse.jgit.lfs.lib.Constants.VERIFY;
  
  import java.io.IOException;
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  
  import org.eclipse.jgit.lfs.lib.LongObjectId;
  import org.eclipse.jgit.lfs.server.Response.Action;
  import org.eclipse.jgit.lfs.server.Response.Body;
  import org.eclipse.jgit.lfs.server.internal.LfsServerText;
  
  abstract class TransferHandler {
  
  	static TransferHandler forOperation(String operation,
  			LargeFileRepository repository, List<LfsObject> objects) {
  		switch (operation) {
  		case UPLOAD:
  			return new Upload(repository, objects);
  		case DOWNLOAD:
  			return new Download(repository, objects);
  		case VERIFY:
  		default:
  			throw new UnsupportedOperationException(MessageFormat.format(
  					LfsServerText.get().unsupportedOperation, operation));
  		}
  	}
  
  	private static class Upload extends TransferHandler {
  		Upload(LargeFileRepository repository,
  				List<LfsObject> objects) {
  			super(repository, objects);
  		}
  
  		@Override
  		Body process() throws IOException {
  			Response.Body body = new Response.Body();
  			if (!objects.isEmpty()) {
  				body.objects = new ArrayList<>();
  				for (LfsObject o : objects) {
  					addObjectInfo(body, o);
  				}
  			}
  			return body;
  		}
  
  		private void addObjectInfo(Response.Body body, LfsObject o)
  				throws IOException {
  			Response.ObjectInfo info = new Response.ObjectInfo();
  			body.objects.add(info);
 			info.oid = o.oid;
 			info.size = o.size;
 
 			LongObjectId oid = LongObjectId.fromString(o.oid);
 			if (repository.getSize(oid) == -1) {
 				info.actions = new HashMap<>();
 				info.actions.put(UPLOAD,
 						repository.getUploadAction(oid, o.size));
 				Action verify = repository.getVerifyAction(oid);
 				if (verify != null) {
 					info.actions.put(VERIFY, verify);
 				}
 			}
 		}
 	}
 
 	private static class Download extends TransferHandler {
 		Download(LargeFileRepository repository,
 				List<LfsObject> objects) {
 			super(repository, objects);
 		}
 
 		@Override
 		Body process() throws IOException {
 			Response.Body body = new Response.Body();
 			if (!objects.isEmpty()) {
 				body.objects = new ArrayList<>();
 				for (LfsObject o : objects) {
 					addObjectInfo(body, o);
 				}
 			}
 			return body;
 		}
 
 		private void addObjectInfo(Response.Body body, LfsObject o)
 				throws IOException {
 			Response.ObjectInfo info = new Response.ObjectInfo();
 			body.objects.add(info);
 			info.oid = o.oid;
 			info.size = o.size;
 
 			LongObjectId oid = LongObjectId.fromString(o.oid);
 			if (repository.getSize(oid) >= 0) {
 				info.actions = new HashMap<>();
 				info.actions.put(DOWNLOAD,
 						repository.getDownloadAction(oid));
 			} else {
 				info.error = new Response.Error();
 				info.error.code = SC_NOT_FOUND;
 				info.error.message = MessageFormat.format(
 						LfsServerText.get().objectNotFound,
 						oid.getName());
 			}
 		}
 	}
 
 	final LargeFileRepository repository;
 
 	final List<LfsObject> objects;
 
 	TransferHandler(LargeFileRepository repository,
 			List<LfsObject> objects) {
 		this.repository = repository;
 		this.objects = objects;
 	}
 
 	abstract Response.Body process() throws IOException;
 }