/*
 * Copyright (C) 2011, Christoph Brill <egore911@egore911.de> 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.net.URISyntaxException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

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.TransportException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.FetchConnection;
import org.eclipse.jgit.transport.RefSpec;
import org.eclipse.jgit.transport.Transport;
import org.eclipse.jgit.transport.URIish;

The ls-remote command
See Also:
Git documentation about ls-remote/**
 * The ls-remote command
 *
 * @see <a
 *      href="http://www.kernel.org/pub/software/scm/git/docs/git-ls-remote.html"
 *      >Git documentation about ls-remote</a>
 */
public class LsRemoteCommand extends
		TransportCommand<LsRemoteCommand, Collection<Ref>> {

	private String remote = Constants.DEFAULT_REMOTE_NAME;

	private boolean heads;

	private boolean tags;

	private String uploadPack;

	
Constructor for LsRemoteCommand
Params:
repo – 
           local repository or null for operation without local
           repository/**
	 * Constructor for LsRemoteCommand
	 *
	 * @param repo
	 *            local repository or null for operation without local
	 *            repository
	 */
	public LsRemoteCommand(Repository repo) {
		super(repo);
	}

	
The remote (uri or name) used for the fetch operation. If no remote is
set, the default value of Constants.DEFAULT_REMOTE_NAME will
be used.
Params:
remote –  a String object.
See Also:
DEFAULT_REMOTE_NAME.DEFAULT_REMOTE_NAME
Returns:
this/**
	 * The remote (uri or name) used for the fetch 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
	 *            a {@link java.lang.String} object.
	 * @return {@code this}
	 */
	public LsRemoteCommand setRemote(String remote) {
		checkCallable();
		this.remote = remote;
		return this;
	}

	
Include refs/heads in references results
Params:
heads – 
           whether to include refs/heads
Returns:
this/**
	 * Include refs/heads in references results
	 *
	 * @param heads
	 *            whether to include refs/heads
	 * @return {@code this}
	 */
	public LsRemoteCommand setHeads(boolean heads) {
		this.heads = heads;
		return this;
	}

	
Include refs/tags in references results
Params:
tags – 
           whether to include tags
Returns:
this/**
	 * Include refs/tags in references results
	 *
	 * @param tags
	 *            whether to include tags
	 * @return {@code this}
	 */
	public LsRemoteCommand setTags(boolean tags) {
		this.tags = tags;
		return this;
	}

	
The full path of git-upload-pack on the remote host
Params:
uploadPack – 
           the full path of executable providing the git-upload-pack
           service on remote host
Returns:
this/**
	 * The full path of git-upload-pack on the remote host
	 *
	 * @param uploadPack
	 *            the full path of executable providing the git-upload-pack
	 *            service on remote host
	 * @return {@code this}
	 */
	public LsRemoteCommand setUploadPack(String uploadPack) {
		this.uploadPack = uploadPack;
		return this;
	}

	
{@inheritDoc}
 Execute the LsRemote command with all the options and parameters collected by the setter methods (e.g. setHeads(boolean)) of this class. Each instance of this class should only be used for one invocation of the command. Don't call this method twice on an instance. /**
	 * {@inheritDoc}
	 * <p>
	 * Execute the {@code LsRemote} command with all the options and parameters
	 * collected by the setter methods (e.g. {@link #setHeads(boolean)}) of this
	 * class. Each instance of this class should only be used for one invocation
	 * of the command. Don't call this method twice on an instance.
	 */
	@Override
	public Collection<Ref> call() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		return execute().values();
	}

	
Same as call(), but return Map instead of Collection. 
Throws:
GitAPIException – 
            or subclass thereof when an error occurs
InvalidRemoteException – 
            when called with an invalid remote uri
TransportException – 
            for errors that occurs during transport
Returns:
a map from names to references in the remote repository
Since:
3.5/**
	 * Same as {@link #call()}, but return Map instead of Collection.
	 *
	 * @return a map from names to references in the remote repository
	 * @throws org.eclipse.jgit.api.errors.GitAPIException
	 *             or subclass thereof when an error occurs
	 * @throws org.eclipse.jgit.api.errors.InvalidRemoteException
	 *             when called with an invalid remote uri
	 * @throws org.eclipse.jgit.api.errors.TransportException
	 *             for errors that occurs during transport
	 * @since 3.5
	 */
	public Map<String, Ref> callAsMap() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		return Collections.unmodifiableMap(execute());
	}

	private Map<String, Ref> execute() throws GitAPIException,
			InvalidRemoteException,
			org.eclipse.jgit.api.errors.TransportException {
		checkCallable();

		try (Transport transport = repo != null
				? Transport.open(repo, remote)
				: Transport.open(new URIish(remote))) {
			transport.setOptionUploadPack(uploadPack);
			configure(transport);
			Collection<RefSpec> refSpecs = new ArrayList<>(1);
			if (tags)
				refSpecs.add(new RefSpec(
						"refs/tags/*:refs/remotes/origin/tags/*")); //$NON-NLS-1$
			if (heads)
				refSpecs.add(new RefSpec("refs/heads/*:refs/remotes/origin/*")); //$NON-NLS-1$
			Collection<Ref> refs;
			Map<String, Ref> refmap = new HashMap<>();
			try (FetchConnection fc = transport.openFetch()) {
				refs = fc.getRefs();
				if (refSpecs.isEmpty())
					for (Ref r : refs)
						refmap.put(r.getName(), r);
				else
					for (Ref r : refs)
						for (RefSpec rs : refSpecs)
							if (rs.matchSource(r)) {
								refmap.put(r.getName(), r);
								break;
							}
				return refmap;
			}
		} catch (URISyntaxException e) {
			throw new InvalidRemoteException(MessageFormat.format(
					JGitText.get().invalidRemote, remote), e);
		} catch (NotSupportedException e) {
			throw new JGitInternalException(
					JGitText.get().exceptionCaughtDuringExecutionOfLsRemoteCommand,
					e);
		} catch (TransportException e) {
			throw new org.eclipse.jgit.api.errors.TransportException(
					e.getMessage(),
					e);
		}
	}

}