/*
    * Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.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.api;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.net.URISyntaxException;
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.InvalidRemoteException;
  import org.eclipse.jgit.api.errors.JGitInternalException;
  import org.eclipse.jgit.errors.NotSupportedException;
  import org.eclipse.jgit.errors.TooLargePackException;
  import org.eclipse.jgit.errors.TransportException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.NullProgressMonitor;
  import org.eclipse.jgit.lib.ProgressMonitor;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.transport.PushResult;
  import org.eclipse.jgit.transport.RefSpec;
  import org.eclipse.jgit.transport.RemoteConfig;
  import org.eclipse.jgit.transport.RemoteRefUpdate;
  import org.eclipse.jgit.transport.Transport;
  
  /**
   * A class used to execute a {@code Push} command. It has setters for all
   * supported options and arguments of this command and a {@link #call()} method
   * to finally execute the command.
   *
   * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-push.html"
   *      >Git documentation about Push</a>
   */
  public class PushCommand extends
  		TransportCommand<PushCommand, Iterable<PushResult>> {
  
  	private String remote = Constants.DEFAULT_REMOTE_NAME;
  
  	private final List<RefSpec> refSpecs;
  
  	private ProgressMonitor monitor = NullProgressMonitor.INSTANCE;
  
  	private String receivePack = RemoteConfig.DEFAULT_RECEIVE_PACK;
  
  	private boolean dryRun;
  
  	private boolean force;
  
  	private boolean thin = Transport.DEFAULT_PUSH_THIN;
  
  	private OutputStream out;
  
  	/**
 	 * @param repo
 	 */
 	protected PushCommand(Repository repo) {
 		super(repo);
 		refSpecs = new ArrayList<RefSpec>(3);
 	}
 
 	/**
 	 * Executes the {@code push} command with all the options and parameters
 	 * collected by the setter methods of this class. Each instance of this
 	 * class should only be used for one invocation of the command (means: one
 	 * call to {@link #call()})
 	 *
 	 * @return an iteration over {@link PushResult} objects
 	 * @throws InvalidRemoteException
 	 *             when called with an invalid remote uri
 	 * @throws org.eclipse.jgit.api.errors.TransportException
 	 *             when an error occurs with the transport
 	 * @throws GitAPIException
 	 */
 	public Iterable<PushResult> call() throws GitAPIException,
 			InvalidRemoteException,
 			org.eclipse.jgit.api.errors.TransportException {
 		checkCallable();
 
 		ArrayList<PushResult> pushResults = new ArrayList<PushResult>(3);
 
 		try {
 			if (refSpecs.isEmpty()) {
 				RemoteConfig config = new RemoteConfig(repo.getConfig(),
 						getRemote());
 				refSpecs.addAll(config.getPushRefSpecs());
 			}
 			if (refSpecs.isEmpty()) {
 				Ref head = repo.getRef(Constants.HEAD);
 				if (head != null && head.isSymbolic())
 					refSpecs.add(new RefSpec(head.getLeaf().getName()));
 			}
 
 			if (force) {
 				for (int i = 0; i < refSpecs.size(); i++)
 					refSpecs.set(i, refSpecs.get(i).setForceUpdate(true));
 			}
 
 			final List<Transport> transports;
 			transports = Transport.openAll(repo, remote, Transport.Operation.PUSH);
 			for (final Transport transport : transports) {
 				transport.setPushThin(thin);
 				if (receivePack != null)
 					transport.setOptionReceivePack(receivePack);
 				transport.setDryRun(dryRun);
 				configure(transport);
 
 				final Collection<RemoteRefUpdate> toPush = transport
 						.findRemoteRefUpdatesFor(refSpecs);
 
 				try {
 					PushResult result = transport.push(monitor, toPush, out);
 					pushResults.add(result);
 
 				} catch (TooLargePackException e) {
 					throw new org.eclipse.jgit.api.errors.TooLargePackException(
 							e.getMessage(), e);
 				} catch (TransportException e) {
 					throw new org.eclipse.jgit.api.errors.TransportException(
 							e.getMessage(), e);
 				} finally {
 					transport.close();
 				}
 			}
 
 		} catch (URISyntaxException e) {
 			throw new InvalidRemoteException(MessageFormat.format(
 					JGitText.get().invalidRemote, remote));
 		} catch (TransportException e) {
 			throw new org.eclipse.jgit.api.errors.TransportException(
 					e.getMessage(), e);
 		} catch (NotSupportedException e) {
 			throw new JGitInternalException(
 					JGitText.get().exceptionCaughtDuringExecutionOfPushCommand,
 					e);
 		} catch (IOException e) {
 			throw new JGitInternalException(
 					JGitText.get().exceptionCaughtDuringExecutionOfPushCommand,
 					e);
 		}
 
 		return pushResults;
 
 	}
 
 	/**
 	 * The remote (uri or name) used for the push operation. If no remote is
 	 * set, the default value of <code>Constants.DEFAULT_REMOTE_NAME</code> will
 	 * be used.
 	 *
 	 * @see Constants#DEFAULT_REMOTE_NAME
 	 * @param remote
 	 * @return {@code this}
 	 */
 	public PushCommand setRemote(String remote) {
 		checkCallable();
 		this.remote = remote;
 		return this;
 	}
 
 	/**
 	 * @return the remote used for the remote operation
 	 */
 	public String getRemote() {
 		return remote;
 	}
 
 	/**
 	 * The remote executable providing receive-pack service for pack transports.
 	 * If no receive-pack is set, the default value of
 	 * <code>RemoteConfig.DEFAULT_RECEIVE_PACK</code> will be used.
 	 *
 	 * @see RemoteConfig#DEFAULT_RECEIVE_PACK
 	 * @param receivePack
 	 * @return {@code this}
 	 */
 	public PushCommand setReceivePack(String receivePack) {
 		checkCallable();
 		this.receivePack = receivePack;
 		return this;
 	}
 
 	/**
 	 * @return the receive-pack used for the remote operation
 	 */
 	public String getReceivePack() {
 		return receivePack;
 	}
 
 	/**
 	 * @return the timeout used for the push operation
 	 */
 	public int getTimeout() {
 		return timeout;
 	}
 
 	/**
 	 * @return the progress monitor for the push operation
 	 */
 	public ProgressMonitor getProgressMonitor() {
 		return monitor;
 	}
 
 	/**
 	 * The progress monitor associated with the push operation. By default, this
 	 * is set to <code>NullProgressMonitor</code>
 	 *
 	 * @see NullProgressMonitor
 	 *
 	 * @param monitor
 	 * @return {@code this}
 	 */
 	public PushCommand setProgressMonitor(ProgressMonitor monitor) {
 		checkCallable();
 		if (monitor == null) {
 			monitor = NullProgressMonitor.INSTANCE;
 		}
 		this.monitor = monitor;
 		return this;
 	}
 
 	/**
 	 * @return the ref specs
 	 */
 	public List<RefSpec> getRefSpecs() {
 		return refSpecs;
 	}
 
 	/**
 	 * The ref specs to be used in the push operation
 	 *
 	 * @param specs
 	 * @return {@code this}
 	 */
 	public PushCommand setRefSpecs(RefSpec... specs) {
 		checkCallable();
 		this.refSpecs.clear();
 		Collections.addAll(refSpecs, specs);
 		return this;
 	}
 
 	/**
 	 * The ref specs to be used in the push operation
 	 *
 	 * @param specs
 	 * @return {@code this}
 	 */
 	public PushCommand setRefSpecs(List<RefSpec> specs) {
 		checkCallable();
 		this.refSpecs.clear();
 		this.refSpecs.addAll(specs);
 		return this;
 	}
 
 	/**
 	 * Push all branches under refs/heads/*.
 	 *
 	 * @return {code this}
 	 */
 	public PushCommand setPushAll() {
 		refSpecs.add(Transport.REFSPEC_PUSH_ALL);
 		return this;
 	}
 
 	/**
 	 * Push all tags under refs/tags/*.
 	 *
 	 * @return {code this}
 	 */
 	public PushCommand setPushTags() {
 		refSpecs.add(Transport.REFSPEC_TAGS);
 		return this;
 	}
 
 	/**
 	 * Add a reference to push.
 	 *
 	 * @param ref
 	 *            the source reference. The remote name will match.
 	 * @return {@code this}.
 	 */
 	public PushCommand add(Ref ref) {
 		refSpecs.add(new RefSpec(ref.getLeaf().getName()));
 		return this;
 	}
 
 	/**
 	 * Add a reference to push.
 	 *
 	 * @param nameOrSpec
 	 *            any reference name, or a reference specification.
 	 * @return {@code this}.
 	 * @throws JGitInternalException
 	 *             the reference name cannot be resolved.
 	 */
 	public PushCommand add(String nameOrSpec) {
 		if (0 <= nameOrSpec.indexOf(':')) {
 			refSpecs.add(new RefSpec(nameOrSpec));
 		} else {
 			Ref src;
 			try {
 				src = repo.getRef(nameOrSpec);
 			} catch (IOException e) {
 				throw new JGitInternalException(
 						JGitText.get().exceptionCaughtDuringExecutionOfPushCommand,
 						e);
 			}
 			if (src != null)
 				add(src);
 		}
 		return this;
 	}
 
 	/**
 	 * @return the dry run preference for the push operation
 	 */
 	public boolean isDryRun() {
 		return dryRun;
 	}
 
 	/**
 	 * Sets whether the push operation should be a dry run
 	 *
 	 * @param dryRun
 	 * @return {@code this}
 	 */
 	public PushCommand setDryRun(boolean dryRun) {
 		checkCallable();
 		this.dryRun = dryRun;
 		return this;
 	}
 
 	/**
 	 * @return the thin-pack preference for push operation
 	 */
 	public boolean isThin() {
 		return thin;
 	}
 
 	/**
 	 * Sets the thin-pack preference for push operation.
 	 *
 	 * Default setting is Transport.DEFAULT_PUSH_THIN
 	 *
 	 * @param thin
 	 * @return {@code this}
 	 */
 	public PushCommand setThin(boolean thin) {
 		checkCallable();
 		this.thin = thin;
 		return this;
 	}
 
 	/**
 	 * @return the force preference for push operation
 	 */
 	public boolean isForce() {
 		return force;
 	}
 
 	/**
 	 * Sets the force preference for push operation.
 	 *
 	 * @param force
 	 * @return {@code this}
 	 */
 	public PushCommand setForce(boolean force) {
 		checkCallable();
 		this.force = force;
 		return this;
 	}
 
 	/**
 	 * Sets the output stream to write sideband messages to
 	 *
 	 * @param out
 	 * @return {@code this}
 	 * @since 3.0
 	 */
 	public PushCommand setOutputStream(OutputStream out) {
 		this.out = out;
 		return this;
 	}
 }