/*
    * Copyright (C) 2011, Tomasz Zarna <Tomasz.Zarna@pl.ibm.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.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.api.errors.JGitInternalException;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.RefUpdate;
  import org.eclipse.jgit.lib.RefUpdate.Result;
  import org.eclipse.jgit.lib.Repository;
  
  /**
   * Used to delete one or several tags.
   *
   * The result of {@link #call()} is a list with the (full) names of the deleted
   * tags.
   *
   * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-tag.html"
   *      >Git documentation about Tag</a>
   */
  public class DeleteTagCommand extends GitCommand<List<String>> {
  
  	private final Set<String> tags = new HashSet<>();
  
  	/**
  	 * Constructor for DeleteTagCommand
  	 *
  	 * @param repo
  	 *            the {@link org.eclipse.jgit.lib.Repository}
  	 */
  	protected DeleteTagCommand(Repository repo) {
  		super(repo);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public List<String> call() throws GitAPIException {
  		checkCallable();
  		List<String> result = new ArrayList<>();
  		if (tags.isEmpty())
  			return result;
  		try {
  			setCallable(false);
  			for (String tagName : tags) {
  				if (tagName == null)
  					continue;
  				Ref currentRef = repo.findRef(tagName);
  				if (currentRef == null)
  					continue;
  				String fullName = currentRef.getName();
  				RefUpdate update = repo.updateRef(fullName);
  				update.setForceUpdate(true);
  				Result deleteResult = update.delete();
  
  				boolean ok = true;
  				switch (deleteResult) {
  				case IO_FAILURE:
  				case LOCK_FAILURE:
  				case REJECTED:
  					ok = false;
  					break;
  				default:
  					break;
  				}
  
  				if (ok) {
  					result.add(fullName);
  				} else
  					throw new JGitInternalException(MessageFormat.format(
  							JGitText.get().deleteTagUnexpectedResult,
  							deleteResult.name()));
  			}
  			return result;
  		} catch (IOException ioe) {
  			throw new JGitInternalException(ioe.getMessage(), ioe);
  		}
  	}
  
  	/**
  	 * Set names of the tags to delete
  	 *
  	 * @param tags
  	 *            the names of the tags to delete; if not set, this will do
 	 *            nothing; invalid tag names will simply be ignored
 	 * @return this instance
 	 */
 	public DeleteTagCommand setTags(String... tags) {
 		checkCallable();
 		this.tags.clear();
 		this.tags.addAll(Arrays.asList(tags));
 		return this;
 	}
 }