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

	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
*/

namespace Q2A\Recalc;

require_once QA_INCLUDE_DIR . 'app/events.php';
require_once QA_INCLUDE_DIR . 'app/updates.php';
require_once QA_INCLUDE_DIR . 'util/sort.php';


class RefillEventsRefill extends AbstractStep
{
	public function doStep()
	{
		$questionids = qa_db_qs_get_for_event_refilling($this->state->next, 1);

		if (empty($questionids)) {
			$this->state->transition('dorefillevents_complete');
			return false;
		}

		$lastquestionid = max($questionids);

		foreach ($questionids as $questionid) {
			// Retrieve all posts relating to this question

			list($question, $childposts, $achildposts) = qa_db_select_with_pending(
				qa_db_full_post_selectspec(null, $questionid),
				qa_db_full_child_posts_selectspec(null, $questionid),
				qa_db_full_a_child_posts_selectspec(null, $questionid)
			);

			// Merge all posts while preserving keys as postids

			$posts = array($questionid => $question);

			foreach ($childposts as $postid => $post) {
				$posts[$postid] = $post;
			}

			foreach ($achildposts as $postid => $post) {
				$posts[$postid] = $post;
			}

			// Creation and editing of each post

			foreach ($posts as $postid => $post) {
				$followonq = ($post['basetype'] == 'Q') && ($postid != $questionid);

				if ($followonq) {
					$updatetype = QA_UPDATE_FOLLOWS;
				} elseif ($post['basetype'] == 'C' && @$posts[$post['parentid']]['basetype'] == 'Q') {
					$updatetype = QA_UPDATE_C_FOR_Q;
				} elseif ($post['basetype'] == 'C' && @$posts[$post['parentid']]['basetype'] == 'A') {
					$updatetype = QA_UPDATE_C_FOR_A;
				} else {
					$updatetype = null;
				}

				qa_create_event_for_q_user($questionid, $postid, $updatetype, $post['userid'], @$posts[$post['parentid']]['userid'], $post['created']);

				if (isset($post['updated']) && !$followonq) {
					qa_create_event_for_q_user($questionid, $postid, $post['updatetype'], $post['lastuserid'], $post['userid'], $post['updated']);
				}
			}

			// Tags and categories of question

			qa_create_event_for_tags($question['tags'], $questionid, null, $question['userid'], $question['created']);
			qa_create_event_for_category($question['categoryid'], $questionid, null, $question['userid'], $question['created']);

			// Collect comment threads

			$parentidcomments = array();

			foreach ($posts as $postid => $post) {
				if ($post['basetype'] == 'C') {
					$parentidcomments[$post['parentid']][$postid] = $post;
				}
			}

			// For each comment thread, notify all previous comment authors of each comment in the thread (could get slow)

			foreach ($parentidcomments as $parentid => $comments) {
				$keyuserids = array();

				qa_sort_by($comments, 'created');

				foreach ($comments as $comment) {
					foreach ($keyuserids as $keyuserid => $dummy) {
						if ($keyuserid != $comment['userid'] && $keyuserid != @$posts[$parentid]['userid']) {
							qa_db_event_create_not_entity($keyuserid, $questionid, $comment['postid'], QA_UPDATE_FOLLOWS, $comment['userid'], $comment['created']);
						}
					}

					if (isset($comment['userid'])) {
						$keyuserids[$comment['userid']] = true;
					}
				}
			}
		}

		$this->state->next = 1 + $lastquestionid;
		$this->state->done += count($questionids);
		return true;
	}

	public function getMessage()
	{
		return $this->progressLang('admin/refill_events_refilled', $this->state->done, $this->state->length);
	}
}