/*
 * 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();
	}
}