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

	File: qa-include/qa-ajax-comment.php
	Description: Server-side response to Ajax create comment requests


	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
*/

	require_once QA_INCLUDE_DIR.'app/users.php';
	require_once QA_INCLUDE_DIR.'app/limits.php';
	require_once QA_INCLUDE_DIR.'db/selects.php';


//	Load relevant information about this question and the comment parent

	$questionid=qa_post_text('c_questionid');
	$parentid=qa_post_text('c_parentid');
	$userid=qa_get_logged_in_userid();

	list($question, $parent, $children)=qa_db_select_with_pending(
		qa_db_full_post_selectspec($userid, $questionid),
		qa_db_full_post_selectspec($userid, $parentid),
		qa_db_full_child_posts_selectspec($userid, $parentid)
	);


//	Check if the question and parent exist, and whether the user has permission to do this

	if (
		(@$question['basetype']=='Q') &&
		((@$parent['basetype']=='Q') || (@$parent['basetype']=='A')) &&
		!qa_user_post_permit_error('permit_post_c', $parent, QA_LIMIT_COMMENTS))
	{
		require_once QA_INCLUDE_DIR.'app/captcha.php';
		require_once QA_INCLUDE_DIR.'app/format.php';
		require_once QA_INCLUDE_DIR.'app/post-create.php';
		require_once QA_INCLUDE_DIR.'app/cookies.php';
		require_once QA_INCLUDE_DIR.'pages/question-view.php';
		require_once QA_INCLUDE_DIR.'pages/question-submit.php';
		require_once QA_INCLUDE_DIR.'util/sort.php';


	//	Try to create the new comment

		$usecaptcha=qa_user_use_captcha(qa_user_level_for_post($question));
		$commentid=qa_page_q_add_c_submit($question, $parent, $children, $usecaptcha, $in, $errors);


	//	If successful, page content will be updated via Ajax

		if (isset($commentid)) {
			$children=qa_db_select_with_pending(qa_db_full_child_posts_selectspec($userid, $parentid));

			$parent=$parent+qa_page_q_post_rules($parent, ($questionid==$parentid) ? null : $question, null, $children);
				// in theory we should retrieve the parent's siblings for the above, but they're not going to be relevant

			foreach ($children as $key => $child)
				$children[$key]=$child+qa_page_q_post_rules($child, $parent, $children, null);

			$usershtml=qa_userids_handles_html($children, true);

			qa_sort_by($children, 'created');

			$c_list=qa_page_q_comment_follow_list($question, $parent, $children, true, $usershtml, false, null);

			$themeclass=qa_load_theme_class(qa_get_site_theme(), 'ajax-comments', null, null);
			$themeclass->initialize();

			echo "QA_AJAX_RESPONSE\n1\n";


		//	Send back the ID of the new comment

			echo qa_anchor('C', $commentid)."\n";


		//	Send back the HTML

			$themeclass->c_list_items($c_list['cs']);

			return;
		}
	}

	echo "QA_AJAX_RESPONSE\n0\n"; // fall back to non-Ajax submission if there were any problems


/*
	Omit PHP closing tag to help avoid accidental output
*/