<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	Description: Handles the submission of events to the database (application level)


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
	header('Location: ../../');
	exit;
}

require_once QA_INCLUDE_DIR . 'db/events.php';
require_once QA_INCLUDE_DIR . 'app/updates.php';


/**
 * Add appropriate events to the database for an action performed on a question. The event of type $updatetype relates
 * to $lastpostid whose antecedent question is $questionid, and was caused by $lastuserid. Pass a unix $timestamp for
 * the event time or leave as null to use now. This will add an event to $questionid's and $lastuserid's streams. If
 * $otheruserid is set, it will also add an notification-style event for that user, unless they are the one who did it.
 * @param $questionid
 * @param $lastpostid
 * @param $updatetype
 * @param $lastuserid
 * @param $otheruserid
 * @param $timestamp
 */
function qa_create_event_for_q_user($questionid, $lastpostid, $updatetype, $lastuserid, $otheruserid = null, $timestamp = null)
{
	qa_db_event_create_for_entity(QA_ENTITY_QUESTION, $questionid, $questionid, $lastpostid, $updatetype, $lastuserid, $timestamp); // anyone who favorited the question

	if (isset($lastuserid) && !QA_FINAL_EXTERNAL_USERS)
		qa_db_event_create_for_entity(QA_ENTITY_USER, $lastuserid, $questionid, $lastpostid, $updatetype, $lastuserid, $timestamp); // anyone who favorited the user who did it

	if (isset($otheruserid) && ($otheruserid != $lastuserid))
		qa_db_event_create_not_entity($otheruserid, $questionid, $lastpostid, $updatetype, $lastuserid, $timestamp); // possible other user to be informed
}


/**
 * Add appropriate events to the database for an action performed on a set of tags in $tagstring (namely, a question
 * being created with those tags or having one of those tags added afterwards). The event of type $updatetype relates
 * to the question $questionid, and was caused by $lastuserid. Pass a unix $timestamp for the event time or leave as
 * null to use now.
 * @param $tagstring
 * @param $questionid
 * @param $updatetype
 * @param $lastuserid
 * @param $timestamp
 */
function qa_create_event_for_tags($tagstring, $questionid, $updatetype, $lastuserid, $timestamp = null)
{
	require_once QA_INCLUDE_DIR . 'util/string.php';
	require_once QA_INCLUDE_DIR . 'db/post-create.php';

	$tagwordids = qa_db_word_mapto_ids(array_unique(qa_tagstring_to_tags($tagstring)));
	foreach ($tagwordids as $wordid) {
		qa_db_event_create_for_entity(QA_ENTITY_TAG, $wordid, $questionid, $questionid, $updatetype, $lastuserid, $timestamp);
	}
}


/**
 * Add appropriate events to the database for an action performed on $categoryid (namely, a question being created in
 * that category or being moved to it later on), along with all of its ancestor categories. The event of type
 * $updatetype relates to the question $questionid, and was caused by $lastuserid. Pass a unix $timestamp for the event
 * time or leave as null to use now.
 * @param $categoryid
 * @param $questionid
 * @param $updatetype
 * @param $lastuserid
 * @param $timestamp
 */
function qa_create_event_for_category($categoryid, $questionid, $updatetype, $lastuserid, $timestamp = null)
{
	if (isset($categoryid)) {
		require_once QA_INCLUDE_DIR . 'db/selects.php';
		require_once QA_INCLUDE_DIR . 'app/format.php';

		$categories = qa_category_path(qa_db_single_select(qa_db_category_nav_selectspec($categoryid, true)), $categoryid);
		foreach ($categories as $category) {
			qa_db_event_create_for_entity(QA_ENTITY_CATEGORY, $category['categoryid'], $questionid, $questionid, $updatetype, $lastuserid, $timestamp);
		}
	}
}