/*
    * Copyright (C) 2015 Obeo. 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.hooks;
  
  import java.io.IOException;
  import java.io.PrintStream;
  import java.util.Collection;
  
  import org.eclipse.jgit.api.errors.AbortedByHookException;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.transport.RemoteRefUpdate;
  
  /**
   * The <code>pre-push</code> hook implementation. The pre-push hook runs during
   * git push, after the remote refs have been updated but before any objects have
   * been transferred.
   *
   * @since 4.2
   */
  public class PrePushHook extends GitHook<String> {
  
  	/**
  	 * Constant indicating the name of the pre-push hook.
  	 */
  	public static final String NAME = "pre-push"; //$NON-NLS-1$
  
  	private String remoteName;
  
  	private String remoteLocation;
  
  	private String refs;
  
  	/**
  	 * Constructor for PrePushHook
  	 * <p>
  	 * This constructor will use the default error stream.
  	 * </p>
  	 *
  	 * @param repo
  	 *            The repository
  	 * @param outputStream
  	 *            The output stream the hook must use. {@code null} is allowed,
  	 *            in which case the hook will use {@code System.out}.
  	 */
  	protected PrePushHook(Repository repo, PrintStream outputStream) {
  		super(repo, outputStream);
  	}
  
  	/**
  	 * Constructor for PrePushHook
  	 *
  	 * @param repo
  	 *            The repository
  	 * @param outputStream
  	 *            The output stream the hook must use. {@code null} is allowed,
  	 *            in which case the hook will use {@code System.out}.
  	 * @param errorStream
  	 *            The error stream the hook must use. {@code null} is allowed,
  	 *            in which case the hook will use {@code System.err}.
  	 * @since 5.6
  	 */
  	protected PrePushHook(Repository repo, PrintStream outputStream,
  			PrintStream errorStream) {
  		super(repo, outputStream, errorStream);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected String getStdinArgs() {
  		return refs;
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public String call() throws IOException, AbortedByHookException {
  		if (canRun()) {
  			doRun();
  		}
  		return ""; //$NON-NLS-1$
  	}
  
  	/**
  	 * @return {@code true}
  	 */
  	private boolean canRun() {
  		return true;
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public String getHookName() {
 		return NAME;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 * <p>
 	 * This hook receives two parameters, which is the name and the location of
 	 * the remote repository.
 	 */
 	@Override
 	protected String[] getParameters() {
 		if (remoteName == null) {
 			remoteName = remoteLocation;
 		}
 		return new String[] { remoteName, remoteLocation };
 	}
 
 	/**
 	 * Set remote name
 	 *
 	 * @param name
 	 *            remote name
 	 */
 	public void setRemoteName(String name) {
 		remoteName = name;
 	}
 
 	/**
 	 * Get remote name
 	 *
 	 * @return remote name or null
 	 * @since 4.11
 	 */
 	protected String getRemoteName() {
 		return remoteName;
 	}
 
 	/**
 	 * Set remote location
 	 *
 	 * @param location
 	 *            a remote location
 	 */
 	public void setRemoteLocation(String location) {
 		remoteLocation = location;
 	}
 
 	/**
 	 * Set Refs
 	 *
 	 * @param toRefs
 	 *            a collection of {@code RemoteRefUpdate}s
 	 */
 	public void setRefs(Collection<RemoteRefUpdate> toRefs) {
 		StringBuilder b = new StringBuilder();
 		for (RemoteRefUpdate u : toRefs) {
 			b.append(u.getSrcRef());
 			b.append(" "); //$NON-NLS-1$
 			b.append(u.getNewObjectId().getName());
 			b.append(" "); //$NON-NLS-1$
 			b.append(u.getRemoteName());
 			b.append(" "); //$NON-NLS-1$
 			ObjectId ooid = u.getExpectedOldObjectId();
 			b.append((ooid == null) ? ObjectId.zeroId().getName() : ooid
 					.getName());
 			b.append("\n"); //$NON-NLS-1$
 		}
 		refs = b.toString();
 	}
 }