/*
    * Copyright (C) 2010, 2022 Chris Aniszczyk <caniszczyk@gmail.com> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  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.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.eclipse.jgit.api.errors.DetachedHeadException;
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.InvalidRefNameException;
  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.TooLargeObjectInPackException;
  import org.eclipse.jgit.errors.TooLargePackException;
  import org.eclipse.jgit.errors.TransportException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.BranchConfig;
  import org.eclipse.jgit.lib.Config;
  import org.eclipse.jgit.lib.ConfigConstants;
  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.PushConfig;
  import org.eclipse.jgit.transport.PushConfig.PushDefault;
  import org.eclipse.jgit.transport.PushResult;
  import org.eclipse.jgit.transport.RefLeaseSpec;
  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;
  
  	private final List<RefSpec> refSpecs;
  
  	private final Map<String, RefLeaseSpec> refLeaseSpecs;
  
  	private ProgressMonitor monitor = NullProgressMonitor.INSTANCE;
  
  	private String receivePack = RemoteConfig.DEFAULT_RECEIVE_PACK;
  
  	private boolean dryRun;
  	private boolean atomic;
  	private boolean force;
  	private boolean thin = Transport.DEFAULT_PUSH_THIN;
  
  	private OutputStream out;
  
  	private List<String> pushOptions;
  
  	// Legacy behavior as default. Use setPushDefault(null) to determine the
  	// value from the git config.
  	private PushDefault pushDefault = PushDefault.CURRENT;
  
  	/**
  	 * <p>
  	 * Constructor for PushCommand.
  	 * </p>
  	 *
  	 * @param repo
  	 *            the {@link org.eclipse.jgit.lib.Repository}
  	 */
  	protected PushCommand(Repository repo) {
  		super(repo);
  		refSpecs = new ArrayList<>(3);
  		refLeaseSpecs = new HashMap<>();
  	}
  
  	/**
 	 * {@inheritDoc}
 	 * <p>
 	 * Execute 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()})
 	 */
 	@Override
 	public Iterable<PushResult> call() throws GitAPIException,
 			InvalidRemoteException,
 			org.eclipse.jgit.api.errors.TransportException {
 		checkCallable();
 		setCallable(false);
 
 		ArrayList<PushResult> pushResults = new ArrayList<>(3);
 
 		try {
 			Config config = repo.getConfig();
 			remote = determineRemote(config, remote);
 			if (refSpecs.isEmpty()) {
 				RemoteConfig rc = new RemoteConfig(config,
 						getRemote());
 				refSpecs.addAll(rc.getPushRefSpecs());
 				if (refSpecs.isEmpty()) {
 					determineDefaultRefSpecs(config);
 				}
 			}
 
 			if (force) {
 				for (int i = 0; i < refSpecs.size(); i++)
 					refSpecs.set(i, refSpecs.get(i).setForceUpdate(true));
 			}
 
 			List<Transport> transports = Transport.openAll(repo, remote,
 					Transport.Operation.PUSH);
 			for (@SuppressWarnings("resource") // Explicitly closed in finally
 					final Transport transport : transports) {
 				transport.setPushThin(thin);
 				transport.setPushAtomic(atomic);
 				if (receivePack != null)
 					transport.setOptionReceivePack(receivePack);
 				transport.setDryRun(dryRun);
 				transport.setPushOptions(pushOptions);
 				configure(transport);
 
 				final Collection<RemoteRefUpdate> toPush = transport
 						.findRemoteRefUpdatesFor(refSpecs, refLeaseSpecs);
 
 				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 (TooLargeObjectInPackException e) {
 					throw new org.eclipse.jgit.api.errors.TooLargeObjectInPackException(
 							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),
 					e);
 		} 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;
 	}
 
 	private String determineRemote(Config config, String remoteName)
 			throws IOException {
 		if (remoteName != null) {
 			return remoteName;
 		}
 		Ref head = repo.exactRef(Constants.HEAD);
 		String effectiveRemote = null;
 		BranchConfig branchCfg = null;
 		if (head != null && head.isSymbolic()) {
 			String currentBranch = head.getLeaf().getName();
 			branchCfg = new BranchConfig(config,
 					Repository.shortenRefName(currentBranch));
 			effectiveRemote = branchCfg.getPushRemote();
 		}
 		if (effectiveRemote == null) {
 			effectiveRemote = config.getString(
 					ConfigConstants.CONFIG_REMOTE_SECTION, null,
 					ConfigConstants.CONFIG_KEY_PUSH_DEFAULT);
 			if (effectiveRemote == null && branchCfg != null) {
 				effectiveRemote = branchCfg.getRemote();
 			}
 		}
 		if (effectiveRemote == null) {
 			effectiveRemote = Constants.DEFAULT_REMOTE_NAME;
 		}
 		return effectiveRemote;
 	}
 
 	private String getCurrentBranch()
 			throws IOException, DetachedHeadException {
 		Ref head = repo.exactRef(Constants.HEAD);
 		if (head != null && head.isSymbolic()) {
 			return head.getLeaf().getName();
 		}
 		throw new DetachedHeadException();
 	}
 
 	private void determineDefaultRefSpecs(Config config)
 			throws IOException, GitAPIException {
 		if (pushDefault == null) {
 			pushDefault = config.get(PushConfig::new).getPushDefault();
 		}
 		switch (pushDefault) {
 		case CURRENT:
 			refSpecs.add(new RefSpec(getCurrentBranch()));
 			break;
 		case MATCHING:
 			refSpecs.add(new RefSpec(":")); //$NON-NLS-1$
 			break;
 		case NOTHING:
 			throw new InvalidRefNameException(
 					JGitText.get().pushDefaultNothing);
 		case SIMPLE:
 		case UPSTREAM:
 			String currentBranch = getCurrentBranch();
 			BranchConfig branchCfg = new BranchConfig(config,
 					Repository.shortenRefName(currentBranch));
 			String fetchRemote = branchCfg.getRemote();
 			if (fetchRemote == null) {
 				fetchRemote = Constants.DEFAULT_REMOTE_NAME;
 			}
 			boolean isTriangular = !fetchRemote.equals(remote);
 			if (isTriangular) {
 				if (PushDefault.UPSTREAM.equals(pushDefault)) {
 					throw new InvalidRefNameException(MessageFormat.format(
 							JGitText.get().pushDefaultTriangularUpstream,
 							remote, fetchRemote));
 				}
 				// Strange, but consistent with C git: "simple" doesn't even
 				// check whether there is a configured upstream, and if so, that
 				// it is equal to the local branch name. It just becomes
 				// "current".
 				refSpecs.add(new RefSpec(currentBranch));
 			} else {
 				String trackedBranch = branchCfg.getMerge();
 				if (branchCfg.isRemoteLocal() || trackedBranch == null
 						|| !trackedBranch.startsWith(Constants.R_HEADS)) {
 					throw new InvalidRefNameException(MessageFormat.format(
 							JGitText.get().pushDefaultNoUpstream,
 							currentBranch));
 				}
 				if (PushDefault.SIMPLE.equals(pushDefault)
 						&& !trackedBranch.equals(currentBranch)) {
 					throw new InvalidRefNameException(MessageFormat.format(
 							JGitText.get().pushDefaultSimple, currentBranch,
 							trackedBranch));
 				}
 				refSpecs.add(new RefSpec(currentBranch + ':' + trackedBranch));
 			}
 			break;
 		default:
 			throw new InvalidRefNameException(MessageFormat
 					.format(JGitText.get().pushDefaultUnknown, pushDefault));
 		}
 	}
 
 	/**
 	 * 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
 	 *            the remote name
 	 * @return {@code this}
 	 */
 	public PushCommand setRemote(String remote) {
 		checkCallable();
 		this.remote = remote;
 		return this;
 	}
 
 	/**
 	 * Get remote name
 	 *
 	 * @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
 	 *            name of the remote executable providing the receive-pack
 	 *            service
 	 * @return {@code this}
 	 */
 	public PushCommand setReceivePack(String receivePack) {
 		checkCallable();
 		this.receivePack = receivePack;
 		return this;
 	}
 
 	/**
 	 * Get the name of the remote executable providing the receive-pack service
 	 *
 	 * @return the receive-pack used for the remote operation
 	 */
 	public String getReceivePack() {
 		return receivePack;
 	}
 
 	/**
 	 * Get timeout used for push operation
 	 *
 	 * @return the timeout used for the push operation
 	 */
 	public int getTimeout() {
 		return timeout;
 	}
 
 	/**
 	 * Get the progress monitor
 	 *
 	 * @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
 	 *            a {@link org.eclipse.jgit.lib.ProgressMonitor}
 	 * @return {@code this}
 	 */
 	public PushCommand setProgressMonitor(ProgressMonitor monitor) {
 		checkCallable();
 		if (monitor == null) {
 			monitor = NullProgressMonitor.INSTANCE;
 		}
 		this.monitor = monitor;
 		return this;
 	}
 
 	/**
 	 * Get the <code>RefLeaseSpec</code>s.
 	 *
 	 * @return the <code>RefLeaseSpec</code>s
 	 * @since 4.7
 	 */
 	public List<RefLeaseSpec> getRefLeaseSpecs() {
 		return new ArrayList<>(refLeaseSpecs.values());
 	}
 
 	/**
 	 * The ref lease specs to be used in the push operation, for a
 	 * force-with-lease push operation.
 	 *
 	 * @param specs
 	 *            a {@link org.eclipse.jgit.transport.RefLeaseSpec} object.
 	 * @return {@code this}
 	 * @since 4.7
 	 */
 	public PushCommand setRefLeaseSpecs(RefLeaseSpec... specs) {
 		return setRefLeaseSpecs(Arrays.asList(specs));
 	}
 
 	/**
 	 * The ref lease specs to be used in the push operation, for a
 	 * force-with-lease push operation.
 	 *
 	 * @param specs
 	 *            list of {@code RefLeaseSpec}s
 	 * @return {@code this}
 	 * @since 4.7
 	 */
 	public PushCommand setRefLeaseSpecs(List<RefLeaseSpec> specs) {
 		checkCallable();
 		this.refLeaseSpecs.clear();
 		for (RefLeaseSpec spec : specs) {
 			refLeaseSpecs.put(spec.getRef(), spec);
 		}
 		return this;
 	}
 
 	/**
 	 * Get {@code RefSpec}s.
 	 *
 	 * @return the ref specs
 	 */
 	public List<RefSpec> getRefSpecs() {
 		return refSpecs;
 	}
 
 	/**
 	 * The ref specs to be used in the push operation
 	 *
 	 * @param specs a {@link org.eclipse.jgit.transport.RefSpec} object.
 	 * @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
 	 *            list of {@link org.eclipse.jgit.transport.RefSpec}s
 	 * @return {@code this}
 	 */
 	public PushCommand setRefSpecs(List<RefSpec> specs) {
 		checkCallable();
 		this.refSpecs.clear();
 		this.refSpecs.addAll(specs);
 		return this;
 	}
 
 	/**
 	 * Retrieves the {@link PushDefault} currently set.
 	 *
 	 * @return the {@link PushDefault}, or {@code null} if not set
 	 * @since 6.1
 	 */
 	public PushDefault getPushDefault() {
 		return pushDefault;
 	}
 
 	/**
 	 * Sets an explicit {@link PushDefault}. The default used if this is not
 	 * called is {@link PushDefault#CURRENT} for compatibility reasons with
 	 * earlier JGit versions.
 	 *
 	 * @param pushDefault
 	 *            {@link PushDefault} to set; if {@code null} the value defined
 	 *            in the git config will be used.
 	 *
 	 * @return {@code this}
 	 * @since 6.1
 	 */
 	public PushCommand setPushDefault(PushDefault pushDefault) {
 		checkCallable();
 		this.pushDefault = pushDefault;
 		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.findRef(nameOrSpec);
 			} catch (IOException e) {
 				throw new JGitInternalException(
 						JGitText.get().exceptionCaughtDuringExecutionOfPushCommand,
 						e);
 			}
 			if (src != null)
 				add(src);
 		}
 		return this;
 	}
 
 	/**
 	 * Whether to run the push operation as a dry run
 	 *
 	 * @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 a boolean.
 	 * @return {@code this}
 	 */
 	public PushCommand setDryRun(boolean dryRun) {
 		checkCallable();
 		this.dryRun = dryRun;
 		return this;
 	}
 
 	/**
 	 * Get the thin-pack preference
 	 *
 	 * @return the thin-pack preference for push operation
 	 */
 	public boolean isThin() {
 		return thin;
 	}
 
 	/**
 	 * Set the thin-pack preference for push operation.
 	 *
 	 * Default setting is Transport.DEFAULT_PUSH_THIN
 	 *
 	 * @param thin
 	 *            the thin-pack preference value
 	 * @return {@code this}
 	 */
 	public PushCommand setThin(boolean thin) {
 		checkCallable();
 		this.thin = thin;
 		return this;
 	}
 
 	/**
 	 * Whether this push should be executed atomically (all references updated,
 	 * or none)
 	 *
 	 * @return true if all-or-nothing behavior is requested.
 	 * @since 4.2
 	 */
 	public boolean isAtomic() {
 		return atomic;
 	}
 
 	/**
 	 * Requests atomic push (all references updated, or no updates).
 	 *
 	 * Default setting is false.
 	 *
 	 * @param atomic
 	 *            whether to run the push atomically
 	 * @return {@code this}
 	 * @since 4.2
 	 */
 	public PushCommand setAtomic(boolean atomic) {
 		checkCallable();
 		this.atomic = atomic;
 		return this;
 	}
 
 	/**
 	 * Whether to push forcefully
 	 *
 	 * @return the force preference for push operation
 	 */
 	public boolean isForce() {
 		return force;
 	}
 
 	/**
 	 * Sets the force preference for push operation.
 	 *
 	 * @param force
 	 *            whether to push forcefully
 	 * @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
 	 *            an {@link java.io.OutputStream}
 	 * @return {@code this}
 	 * @since 3.0
 	 */
 	public PushCommand setOutputStream(OutputStream out) {
 		this.out = out;
 		return this;
 	}
 
 	/**
 	 * Get push options
 	 *
 	 * @return the option strings associated with the push operation
 	 * @since 4.5
 	 */
 	public List<String> getPushOptions() {
 		return pushOptions;
 	}
 
 	/**
 	 * Set the option strings associated with the push operation.
 	 *
 	 * @param pushOptions
 	 *            a {@link java.util.List} of push option strings
 	 * @return {@code this}
 	 * @since 4.5
 	 */
 	public PushCommand setPushOptions(List<String> pushOptions) {
 		this.pushOptions = pushOptions;
 		return this;
 	}
 }