/*
    * Copyright (C) 2011, 2022 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.io.IOException;
  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.ConfigInvalidException;
  import org.eclipse.jgit.errors.NotSupportedException;
  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;
  import org.eclipse.jgit.transport.UrlConfig;
  import org.eclipse.jgit.util.SystemReader;
  
  /**
   * 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
  	 *
  	 * @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 <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
  	 *
  	 * @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
  	 *
  	 * @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
 	 *
 	 * @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}
 	 * <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 {@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(translate(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(refSpecs)) {
 				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 (IOException | ConfigInvalidException e) {
 			throw new org.eclipse.jgit.api.errors.TransportException(
 					e.getMessage(), e);
 		}
 	}
 
 	private String translate(String uri)
 			throws IOException, ConfigInvalidException {
 		UrlConfig urls = new UrlConfig(
 				SystemReader.getInstance().getUserConfig());
 		return urls.replace(uri);
 	}
 }