<?php /** @file */

namespace Zotlabs\Lib;

use App;

require_once('include/text.php');

/**
 * A thread item
 */

class ThreadItem {

	public  $data = array();
	private $template = 'conv_item.tpl';
	private $comment_box_template = 'comment_item.tpl';
	private $commentable = false;
	// list of supported reaction emojis - a site can over-ride this via config system.reactions
	// Deprecated. Use your operating system or a browser plugin. 
	private $reactions = ['1f60a','1f44f','1f37e','1f48b','1f61e','2665','1f606','1f62e','1f634','1f61c','1f607','1f608'];
	private $toplevel = false;
	private $children = array();
	private $parent = null;
	private $conversation = null;
	private $redirect_url = null;
	private $owner_url = '';
	private $owner_photo = '';
	private $owner_name = '';
	private $owner_censored = false;
	private $wall_to_wall = false;
	private $threaded = false;
	private $visiting = false;
	private $channel = null;
	private $display_mode = 'normal';
	private $reload = '';


	public function __construct($data) {
				
		$this->data = $data;
		$this->toplevel = ($this->get_id() == $this->get_data_value('parent'));
		$this->threaded = get_config('system','thread_allow',true);

		$observer = App::get_observer();

		// Prepare the children
		if($data['children']) {
			foreach($data['children'] as $item) {

				/*
				 * Only add those that will be displayed
				 */

				if(! visible_activity($item)) {
					continue;
				}

				// this is a quick hack to hide ActivityPub DMs that we should not be allowed to see
				// but may have been forwarded as part of a conversation

				if(intval($item['item_private']) && (intval($item['item_restrict']) & 1 ) && $item['mid'] !== $item['parent_mid']) {
					if(! $observer) {
						continue;
					}
				}

				$child = new ThreadItem($item);
				$this->add_child($child);
			}
		}

		// allow a site to configure the order and content of the reaction emoji list
		if($this->toplevel) {
			$x = get_config('system','reactions');
			if($x && is_array($x) && count($x)) {
				$this->reactions = $x;
			}
		}
	}

	/**
	 * Get data in a form usable by a conversation template
	 *
	 * Returns:
	 *      _ The data requested on success
	 *      _ false on failure
	 */

	public function get_template_data($conv_responses, $thread_level = 1, $collapse_all = false) {
	
		$result = array();

		$item     = $this->get_data();

		$commentww = '';
		$sparkle = '';
		$buttons = '';
		$dropping = false;
		$star = false;
		$isstarred = "unstarred fa-star-o";
		$is_comment = false;
		$is_item = false;
		$osparkle = '';
		$total_children = $this->count_descendants();
		$unseen_comments = (($item['real_uid']) ? 0 : $this->count_unseen_descendants());

		$conv = $this->get_conversation();
		$observer = $conv->get_observer();

		$lock = (((intval($item['item_private'])) || (($item['uid'] == local_channel()) && (strlen($item['allow_cid']) || strlen($item['allow_gid']) 
			|| strlen($item['deny_cid']) || strlen($item['deny_gid']))))
			? t('Private Message')
			: false);

		$shareable = ((($conv->get_profile_owner() == local_channel() && local_channel()) && ($item['item_private'] != 1)) ? true : false);

		// allow an exemption for sharing stuff from your private feeds
		if($item['author']['xchan_network'] === 'rss')
			$shareable = true;

		$privacy_warning = false;

		$mode = $conv->get_mode();

		$edlink = 'editpost';

		if(local_channel() && $observer['xchan_hash'] === $item['author_xchan'])
			$edpost = array(z_root() . '/' . $edlink . '/' . $item['id'], t('Edit'));
		else
			$edpost = false;

		if($item['verb'] === 'Announce') {
			$edpost = false;
		}


		if ($observer && $observer['xchan_hash']
			&& ( $observer['xchan_hash'] == $this->get_data_value('author_xchan') 
			|| $observer['xchan_hash'] == $this->get_data_value('owner_xchan') 
			|| $observer['xchan_hash'] == $this->get_data_value('source_xchan') 
			|| $this->get_data_value('uid') == local_channel()))
			$dropping = true;


		if(array_key_exists('real_uid',$item)) {
			$edpost = false;
			$dropping = false;
		}


		if($dropping) {
			$drop = array(
				'dropping' => $dropping,
				'delete' => t('Delete'),
			);
		}		
		elseif(is_site_admin()) {
			$drop = [ 'dropping' => true, 'delete' => t('Admin Delete') ];
		}

		if($observer_is_pageowner) {		
			$multidrop = array(
				'select' => t('Select'), 
			);
		}

		$filer = ((($conv->get_profile_owner() == local_channel()) && (! array_key_exists('real_uid',$item))) ? t('Save to Folder') : false);

		$profile_avatar = $item['author']['xchan_photo_m'];
		$profile_link   = chanlink_hash($item['author_xchan']);
		$profile_name   = $item['author']['xchan_name'];

		$profile_addr = $item['author']['xchan_addr'] ? : $item['author']['xchan_url'];


		$location = format_location($item);
		$isevent = false;
		$attend = null;
		$canvote = false;

		// process action responses - e.g. like/dislike/attend/agree/whatever
		$response_verbs = [ 'like', 'dislike' ];

		if($item['obj_type'] === ACTIVITY_OBJ_EVENT) {
			$response_verbs[] = 'attendyes';
			$response_verbs[] = 'attendno';
			$response_verbs[] = 'attendmaybe';
			if($this->is_commentable() && $observer) {
				$isevent = true;
				$attend = array( t('I will attend'), t('I will not attend'), t('I might attend'));
			}
		}

		$responses = get_responses($conv_responses,$response_verbs,$this,$item);

		$my_responses = [];
		foreach($response_verbs as $v) {
			$my_responses[$v] = (($conv_responses[$v][$item['mid'] . '-m']) ? 1 : 0);
		}

		$like_count = ((x($conv_responses['like'],$item['mid'])) ? $conv_responses['like'][$item['mid']] : '');
		$like_list = ((x($conv_responses['like'],$item['mid'])) ? $conv_responses['like'][$item['mid'] . '-l'] : '');
		if (($like_list) && (count($like_list) > MAX_LIKERS)) {
			$like_list_part = array_slice($like_list, 0, MAX_LIKERS);
			array_push($like_list_part, '<a class="dropdown-item" href="#" data-toggle="modal" data-target="#likeModal-' . $this->get_id() . '"><b>' . t('View all') . '</b></a>');
		} else {
			$like_list_part = '';
		}
		if(get_config('system','show_like_counts',true)) {
			$like_button_label = tt('Like','Likes',$like_count,'noun');
		}
		else {
			$like_button_label = t('Likes','noun');
		}

		$dislike_count = ((x($conv_responses['dislike'],$item['mid'])) ? $conv_responses['dislike'][$item['mid']] : '');
		$dislike_list = ((x($conv_responses['dislike'],$item['mid'])) ? $conv_responses['dislike'][$item['mid'] . '-l'] : '');
		if(get_config('system','show_like_counts',true)) {
				$dislike_button_label = tt('Dislike','Dislikes',$dislike_count,'noun');
		}
		else {
				$dislike_button_label = t('Dislikes','noun');
		}
		
		if (($dislike_list) && (count($dislike_list) > MAX_LIKERS)) {
			$dislike_list_part = array_slice($dislike_list, 0, MAX_LIKERS);
			array_push($dislike_list_part, '<a class="dropdown-item" href="#" data-toggle="modal" data-target="#dislikeModal-' . $this->get_id() . '"><b>' . t('View all') . '</b></a>');
		} else {
			$dislike_list_part = '';
		}


		$showlike    = ((x($conv_responses['like'],$item['mid'])) ? format_like($conv_responses['like'][$item['mid']],$conv_responses['like'][$item['mid'] . '-l'],'like',$item['mid']) : '');
		$showdislike = ((x($conv_responses['dislike'],$item['mid']))  
				? format_like($conv_responses['dislike'][$item['mid']],$conv_responses['dislike'][$item['mid'] . '-l'],'dislike',$item['mid']) : '');

		/*
		 * We should avoid doing this all the time, but it depends on the conversation mode
		 * And the conv mode may change when we change the conv, or it changes its mode
		 * Maybe we should establish a way to be notified about conversation changes
		 */

		$this->check_wall_to_wall();
		
		if($this->is_toplevel()) {
			if(($conv->get_profile_owner() == local_channel()) && (! array_key_exists('real_uid',$item))) {
				$star = array(
					'toggle' => t('Save'),
					'isstarred' => ((intval($item['item_starred'])) ? true : false),
				);
			}
		} 
		else {
			$is_comment = true;
		}


		$verified = (intval($item['item_verified']) ? t('Message signature validated') : '');
		$forged = ((($item['sig']) && (! intval($item['item_verified']))) ? t('Message signature incorrect') : '');
		$unverified = '' ; // (($this->is_wall_to_wall() && (! intval($item['item_verified']))) ? t('Message cannot be verified') : '');


		if($conv->get_profile_owner() == local_channel()) {
			$tagger = array(
				'tagit' => t("Add Tag"),
				'classtagger' => "",
			);
		}

		$has_bookmarks = false;
		if(is_array($item['term'])) {
			foreach($item['term'] as $t) {
				if($t['ttype'] == TERM_BOOKMARK)
					$has_bookmarks = true;
			}
		}

		$has_event = false;
		if(($item['obj_type'] === ACTIVITY_OBJ_EVENT) && $conv->get_profile_owner() == local_channel())
			$has_event = true;

		if($this->is_commentable() && $observer) {
			$like = array( t("I like this \x28toggle\x29"), t("like"));
			$dislike = array( t("I don't like this \x28toggle\x29"), t("dislike"));
		}

		if ($shareable) {
			$share = t('Repeat This');
			$embed = t('Share this');
		}

		$dreport = '';

		$keep_reports = intval(get_config('system','expire_delivery_reports'));
		if($keep_reports === 0)
			$keep_reports = 10;

		if((! get_config('system','disable_dreport')) && strcmp(datetime_convert('UTC','UTC',$item['created']),datetime_convert('UTC','UTC',"now - $keep_reports days")) > 0) {
			$dreport = t('Delivery Report');
			$dreport_link = gen_link_id($item['mid']);
		}
		if(strcmp(datetime_convert('UTC','UTC',$item['created']),datetime_convert('UTC','UTC','now - 12 hours')) > 0)
			$is_new = true;


		localize_item($item);

		if($this->is_toplevel() && $collapse_all) {
			$item['collapse'] = true;
		}

		$opts = [];
		if ($this->is_wall_to_wall()) {
			if ($this->owner_censored) {
				$opts['censored'] = true;
			}
		}

		$body = prepare_body($item,true,$opts);

		// $viewthread (below) is only valid in list mode. If this is a channel page, build the thread viewing link
		// since we can't depend on llink or plink pointing to the right local location.
 
		$owner_address = substr($item['owner']['xchan_addr'],0,strpos($item['owner']['xchan_addr'],'@'));
		$viewthread = $item['llink'];
		if($conv->get_mode() === 'channel')
			$viewthread = z_root() . '/channel/' . $owner_address . '?f=&mid=' . urlencode(gen_link_id($item['mid']));

		$comment_count_txt = sprintf( tt('%d comment','%d comments',$total_children),$total_children );
		$list_unseen_txt = (($unseen_comments) ? sprintf( t('%d unseen'),$unseen_comments) : '');
		
		$children = $this->get_children();


		$has_tags = (($body['tags'] || $body['categories'] || $body['mentions'] || $body['attachments'] || $body['folders']) ? true : false);

		$dropdown_extras_arr = [ 'item' => $item , 'dropdown_extras' => '' ];
		call_hooks('dropdown_extras',$dropdown_extras_arr);
		$dropdown_extras = $dropdown_extras_arr['dropdown_extras'];

		// Pinned item processing                                                                                                                                     
		$allowed_type = (in_array($item['item_type'], get_config('system', 'pin_types', [ ITEM_TYPE_POST ])) ? true : false);                                         
		$pinned_items = ($allowed_type ? get_pconfig($item['uid'], 'pinned', $item['item_type'], []) : []);                                                           
		$pinned = ((! empty($pinned_items) && in_array($item['mid'], $pinned_items)) ? true : false);             

		$tmp_item = array(
			'template' => $this->get_template(),
			'mode' => $mode,
			'item_type' => intval($item['item_type']),
			'comment_order' => $item['comment_order'],
			'parent' => $this->get_data_value('parent'),
			'collapsed' => ((intval($item['comment_order']) > 3) ? true : false),
			'type' => implode("",array_slice(explode("/",$item['verb']),-1)),
			'body' => $body['html'],
			'tags' => $body['tags'],
			'categories' => $body['categories'],
			'mentions' => $body['mentions'],
			'attachments' => $body['attachments'],
			'folders' => $body['folders'],
			'text' => strip_tags($body['html']),
			'id' => $this->get_id(),
			'mid' => $item['mid'],
			'isevent' => $isevent,
			'attend' => $attend,
			'consensus' => $consensus,
			'conlabels' => $conlabels,
			'canvote' => $canvote,
			'linktitle' => sprintf( t('View %s\'s profile - %s'), $profile_name, (($item['author']['xchan_addr']) ? $item['author']['xchan_addr'] : $item['author']['xchan_url'])),
			'olinktitle' => sprintf( t('View %s\'s profile - %s'), $this->get_owner_name(), (($item['owner']['xchan_addr']) ? $item['owner']['xchan_addr'] : $item['owner']['xchan_url'])),
			'llink' => $item['llink'],
			'viewthread' => $viewthread,
			'to' => t('to'),
			'via' => t('via'),
			'wall' => t('Wall-to-Wall'),
			'vwall' => t('via Wall-To-Wall:'),
			'profile_url' => $profile_link,
			'thread_action_menu' => thread_action_menu($item,$conv->get_mode()),
			'thread_author_menu' => thread_author_menu($item,$conv->get_mode()),
			'dreport' => $dreport,
			'dreport_link' => $dreport_link,
			'name' => $profile_name,
			'thumb' => $profile_avatar,
			'osparkle' => $osparkle,
			'sparkle' => $sparkle,
			'title' => $item['title'],
			'title_tosource' => get_pconfig($conv->get_profile_owner(),'system','title_tosource'),
			'ago' => relative_date($item['created']),
			'app' => $item['app'],
			'str_app' => sprintf( t('from %s'), $item['app']),
			'isotime' => datetime_convert('UTC', date_default_timezone_get(), $item['created'], 'c'),
			'localtime' => datetime_convert('UTC', date_default_timezone_get(), $item['created'], 'r'),
			'editedtime' => (($item['edited'] != $item['created']) ? sprintf( t('last edited: %s'), datetime_convert('UTC', date_default_timezone_get(), $item['edited'], 'r')) : ''),
			'expiretime' => (($item['expires'] > NULL_DATE) ? sprintf( t('Expires: %s'), datetime_convert('UTC', date_default_timezone_get(), $item['expires'], 'r')):''),
			'lock' => $lock,
			'delayed' => $item['item_delayed'],
			'privacy_warning' => $privacy_warning,
			'verified' => $verified,
			'unverified' => $unverified,
			'forged' => $forged,
			'location' => $location,
			'divider' => get_pconfig($conv->get_profile_owner(),'system','item_divider'),
			'attend_label' => t('Attend'),
			'attend_title' => t('Attendance Options'),
			'vote_label' => t('Vote'),
			'vote_title' => t('Voting Options'),
			'comment_lbl' => (($this->is_commentable() && $observer) ? t('Reply') : ''),
			'is_comment' => $is_comment,
			'is_new' => $is_new,
			'mod_display' => ((argv(0) === 'display') ? true : false),   // comments are not collapsed when using mod_display
			'owner_url' => $this->get_owner_url(),
			'owner_photo' => $this->get_owner_photo(),
			'owner_name' => $this->get_owner_name(),
			'photo' => $body['photo'],
			'event' => $body['event'],
			'has_tags' => $has_tags,
			'reactions' => $this->reactions,

			// Item toolbar buttons

			'emojis'    => '', // deprecated - use your operating system or a browser plugin
			'like'      => $like,
			'dislike'   => $dislike,
			'share'     => $share,
			'embed'     => $embed,
			'rawmid'	=> $item['mid'],
			'plink'     => get_plink($item),
			'edpost'    => $edpost, // ((feature_enabled($conv->get_profile_owner(),'edit_posts')) ? $edpost : ''),
			'star'      => $star,
			'tagger'    => ((feature_enabled($conv->get_profile_owner(),'commtag')) ? $tagger : ''),
			'filer'     => ((feature_enabled($conv->get_profile_owner(),'filing')) ? $filer : ''),
			'pinned'    => ($pinned ? t('Pinned post') : ''),
			'pinnable'  => (($this->is_toplevel() && local_channel() && $item['owner_xchan'] == $observer['xchan_hash'] && $allowed_type && $item['item_private'] == 0 && $item['item_delayed'] == 0) ? '1' : ''),
			'pinme'     => ($pinned ? t('Unpin this post') : t('Pin this post')),  
			'bookmark'  => (($conv->get_profile_owner() == local_channel() && local_channel() && $has_bookmarks) ? t('Save Bookmarks') : ''),
			'addtocal'  => (($has_event && ! $item['resource_id']) ? t('Add to Calendar') : ''),
			'drop'      => $drop,
			'multidrop' => ((feature_enabled($conv->get_profile_owner(),'multi_delete')) ? $multidrop : ''),
			'dropdown_extras' => $dropdown_extras,
			
			// end toolbar buttons

			'unseen_comments' => $unseen_comments,
			'comment_count' => $total_children,
			'comment_count_txt' => $comment_count_txt,
			'list_unseen_txt' => $list_unseen_txt,
			'markseen' => t('Mark all seen'),
			'responses' => $responses,
			'my_responses' => $my_responses,
			'like_count' => $like_count,
			'like_list' => $like_list,
			'like_list_part' => $like_list_part,
			'like_button_label' => $like_button_label,
			'like_modal_title' => t('Likes','noun'),
			'dislike_modal_title' => t('Dislikes','noun'),
			'dislike_count' => $dislike_count,
			'dislike_list' => $dislike_list,
			'dislike_list_part' => $dislike_list_part,
			'dislike_button_label' => $dislike_button_label,
			'modal_dismiss' => t('Close'),
			'showlike' => $showlike,
			'showdislike' => $showdislike,
			'comment' => ($item['item_delayed'] ? '' : $this->get_comment_box($indent)),
			'previewing' => ($conv->is_preview() ? true : false ),
			'preview_lbl' => t('This is an unsaved preview'),
			'wait' => t('Please wait'),
			'submid' => str_replace(['+','='], ['',''], base64_encode($item['mid'])),
			'thread_level' => $thread_level,
			'thread_max' => intval(get_config('system','thread_maxlevel',20)) + 1
		);

		$arr = array('item' => $item, 'output' => $tmp_item);
		call_hooks('display_item', $arr);

		$result = $arr['output'];

		$censored = ((strpos($body['html'],"<button id=\"nsfw-wrap-") !== false && $collapse_all === false) ? true : false);

		$result['children'] = [];

		if (local_channel() && get_pconfig(local_channel(),'system','activitypub',get_config('system','activitypub',true))) {
			// place to store all the author addresses (links if not available) in the thread so we can auto-mention them in JS. 
			$result['authors'] = [];
			// fix to add in sub-replies if replying to a comment on your own post from the top level. 
			if ($observer && ($profile_addr === $observer['xchan_hash'] || $profile_addr === $observer['xchan_addr'])) {
				// ignore it
			}
			else {
				$result['authors'][] = $profile_addr;
			}
//			if ($children) {
//				foreach ($children as $child) {
//					$cdata = $child->get_data();
//					if ($cdata['author']['xchan_addr']) {
//						if ($observer && $observer['xchan_hash'] !== $cdata['author']['xchan_hash'] && ! in_array($cdata['author']['xchan_addr'],$result['authors'])) {
//							$result['authors'][] = $cdata['author']['xchan_addr'];
//						}
//					}
//				}
//			}
					
			// Add any mentions from the immediate parent, unless they are mentions of the current viewer or duplicates
			if ($item['term']) {
				$additional_mentions = [];
				foreach ($item['term'] as $t) {
					if ($t['ttype'] == TERM_MENTION) {
						$additional_mentions[] = ((($position = strpos($t['url'],'url=')) !== false) ? urldecode(substr($t['url'],$position + 4)) : $t['url']);;
					}
				}
				if ($additional_mentions) {
					$r = q("select hubloc_addr, hubloc_id_url, hubloc_hash from hubloc where hubloc_id_url in (" . protect_sprintf(stringify_array($additional_mentions, true)) . ") ");
					if ($r) {
						foreach ($r as $rv) {
							$ment = (($r[0]['hubloc_addr']) ? $r[0]['hubloc_addr'] : $r[0]['hubloc_id_url']);
							if ($ment) {
								if ($observer && $observer['xchan_hash'] !== $rv['hubloc_hash'] && ! in_array($ment,$result['authors'])) {
									$result['authors'][] = $ment;
								}
							}
						}
					}
				}
			}
		}

		$nb_children = count($children);

		$total_children = $this->count_visible_descendants();

		$visible_comments = get_config('system', 'expanded_comments', 3);
		
		if($collapse_all) {
			$visible_comments = 0;
		}
		if(($this->get_display_mode() === 'normal') && ($nb_children > 0)) {
			if ($children) {
				foreach($children as $child) {
					$xz = $child->get_template_data($conv_responses, $thread_level + 1);
					if(strpos($xz['body'],"<button id=\"nsfw-wrap-") !== false && $collapse_all === false) {
						$censored = true;
					}
					$result['children'][] = $xz;
				}
			}
			// Collapse
			if($total_children > $visible_comments && $thread_level == 1) {
				$result['children'][0]['comment_firstcollapsed'] = true;
				$result['children'][0]['num_comments'] = $comment_count_txt;
				$result['children'][0]['hide_text'] = sprintf( t('%s show all'), '<i class="fa fa-chevron-down"></i>');
		//		if($thread_level > 1) {
		//			$result['children'][$nb_children - 1]['comment_lastcollapsed'] = true;
		//		}
		//		else {
		//			$result['children'][$nb_children - ($visible_comments + 1)]['comment_lastcollapsed'] = true;
		//		}
			}
		}

		$result['private'] = $item['item_private'];
		$result['toplevel'] = ($this->is_toplevel() ? 'toplevel_item' : '');

		if($this->is_threaded()) {
			$result['flatten'] = false;
			$result['threaded'] = true;
		}
		else {
			$result['flatten'] = true;
			$result['threaded'] = false;
		}


		if($result['toplevel'] && $censored && (! $collapse_all) && get_pconfig($conv->get_profile_owner(),'nsfw','collapse_all',true)) {
			$copy = $conv_responses;
			$result = $this->get_template_data($copy, 1, true);
		}

		return $result;
	}
	
	public function get_id() {
		return $this->get_data_value('id');
	}

	public function get_display_mode() {
		return $this->display_mode;
	}

	public function set_display_mode($mode) {
		$this->display_mode = $mode;
	}

	public function is_threaded() {
		return $this->threaded;
	}

	public function get_author() {
		$xchan = $this->get_data_value('author');
		if($xchan['xchan_addr']) {
			return $xchan['xchan_addr'];
		}
		return $xchan['xchan_url'];
	}

	public function set_reload($val) {
		$this->reload = $val;
	}

	public function get_reload() {
		return $this->reload;
	}

	public function set_commentable($val) {
		$this->commentable = $val;
		foreach($this->get_children() as $child)
			$child->set_commentable($val);
	}

	public function is_commentable() {
		return $this->commentable;
	}

	/**
	 * Add a child item
	 */
	public function add_child($item) {
		$item_id = $item->get_id();
		if(!$item_id) {
			logger('[ERROR] Item::add_child : Item has no ID!!', LOGGER_DEBUG);
			return false;
		}
		if($this->get_child($item->get_id())) {
			logger('[WARN] Item::add_child : Item already exists ('. $item->get_id() .').', LOGGER_DEBUG);
			return false;
		}

		/*
		 * Only add what will be displayed
		 */

		if(activity_match($item->get_data_value('verb'),ACTIVITY_LIKE) || activity_match($item->get_data_value('verb'),ACTIVITY_DISLIKE)) {
			return false;
		}
		
		$item->set_parent($this);
		$this->children[] = $item;
		return end($this->children);
	}

	/**
	 * Get a child by its ID
	 */
	 
	public function get_child($id) {
		foreach($this->get_children() as $child) {
			if($child->get_id() == $id)
				return $child;
		}
		return null;
	}

	/**
	 * Get all our children
	 */
	 
	public function get_children() {
		return $this->children;
	}

	/**
	 * Set our parent
	 */
	protected function set_parent($item) {
		$parent = $this->get_parent();
		if($parent) {
			$parent->remove_child($this);
		}
		$this->parent = $item;
		$this->set_conversation($item->get_conversation());
	}

	/**
	 * Remove our parent
	 */
	 
	protected function remove_parent() {
		$this->parent = null;
		$this->conversation = null;
	}

	/**
	 * Remove a child
	 */
	 
	public function remove_child($item) {
		$id = $item->get_id();
		foreach($this->get_children() as $key => $child) {
			if($child->get_id() == $id) {
				$child->remove_parent();
				unset($this->children[$key]);
				// Reindex the array, in order to make sure there won't be any trouble on loops using count()
				$this->children = array_values($this->children);
				return true;
			}
		}
		logger('[WARN] Item::remove_child : Item is not a child ('. $id .').', LOGGER_DEBUG);
		return false;
	}

	/**
	 * Get parent item
	 */
	protected function get_parent() {
		return $this->parent;
	}

	/**
	 * set conversation
	 */
	public function set_conversation($conv) {
		$previous_mode = ($this->conversation ? $this->conversation->get_mode() : '');
		
		$this->conversation = $conv;

		// Set it on our children too
		foreach($this->get_children() as $child)
			$child->set_conversation($conv);
	}

	/**
	 * get conversation
	 */
	public function get_conversation() {
		return $this->conversation;
	}

	/**
	 * Get raw data
	 *
	 * We shouldn't need this
	 */
	public function get_data() {
		return $this->data;
	}

	/**
	 * Get a data value
	 *
	 * Returns:
	 *      _ value on success
	 *      _ false on failure
	 */
	public function get_data_value($name) {
		if(!isset($this->data[$name])) {
//			logger('[ERROR] Item::get_data_value : Item has no value name "'. $name .'".', LOGGER_DEBUG);
			return false;
		}

		return $this->data[$name];
	}

	/**
	 * Get template
	 */
	public function get_template() {
		return $this->template;
	}


	public function set_template($t) {
		$this->template = $t;
	}

	/**
	 * Check if this is a toplevel post
	 */
	private function is_toplevel() {
		return $this->toplevel;
	}

	/**
	 * Count the total of our descendants
	 */
	private function count_descendants() {
		$children = $this->get_children();
		$total = count($children);
		if($total > 0) {
			foreach($children as $child) {
				$total += $child->count_descendants();
			}
		}
		return $total;
	}

	public function count_visible_descendants() {
		$total = 0;
		$children = $this->get_children();
		if ($children) {
			foreach ($children as $child) {
				if (! visible_activity($child->data)) {
					continue;
				}
				$total ++;
				$total += $child->count_visible_descendants();
			}
		}
		return $total;
	}


	private function label_descendants($count = 0) {
		if(! array_key_exists('sequence',$this->data)) {
			if($count) {
				$count ++;
			}
			$this->data['sequence'] = $count;
		}
		logger('labelled: ' . print_r($this->data,true), LOGGER_DATA);
		$children = $this->get_children();
		$total = count($children);
		if($total > 0) {
			foreach($children as $child) {
				if(! visible_activity($child->data)) {
					continue;
				}
				if(! array_key_exists('sequence',$this->data)) {
					$count ++;
					$child->data['sequence'] = $count;
					logger('labelled_child: ' . print_r($child->data,true), LOGGER_DATA);
				}
				$child->label_descendants($count);
			}
		}
	}

	private function count_unseen_descendants() {
		$children = $this->get_children();
		$total = count($children);
		if($total > 0) {
			$total = 0;
			foreach($children as $child) {
				if(! visible_activity($child->data)) {
					continue;
				}
				if(intval($child->data['item_unseen']))
					$total ++;
			}
		}
		return $total;
	}


	/**
	 * Get the template for the comment box
	 */
	private function get_comment_box_template() {
		return $this->comment_box_template;
	}

	/**
	 * Get the comment box
	 *
	 * Returns:
	 *      _ The comment box string (empty if no comment box)
	 *      _ false on failure
	 */
	private function get_comment_box($indent) {

		if(!$this->is_toplevel() && !get_config('system','thread_allow',true)) {
			return '';
		}
		
		$comment_box = '';
		$conv = $this->get_conversation();

//		logger('Commentable conv: ' . $conv->is_commentable());

		if(! $this->is_commentable())
			return;

		$template = get_markup_template($this->get_comment_box_template());

		$observer = $conv->get_observer();

		$arr = array('comment_buttons' => '','id' => $this->get_id());
		call_hooks('comment_buttons',$arr);
		$comment_buttons = $arr['comment_buttons'];
		
		$feature_auto_save_draft = ((feature_enabled($conv->get_profile_owner(), 'auto_save_draft')) ? "true" : "false");

		$comment_box = replace_macros($template,array(
			'$return_path' => '',
			'$threaded' => $this->is_threaded(),
			'$jsreload' => $conv->reload,
			'$type' => (($conv->get_mode() === 'channel') ? 'wall-comment' : 'net-comment'),
			'$id' => $this->get_id(),
			'$parent' => $this->get_id(),
			'$comment_buttons' => $comment_buttons,
			'$profile_uid' =>  $conv->get_profile_owner(),
			'$mylink' => $observer['xchan_url'],
			'$mytitle' => t('This is you'),
			'$myphoto' => $observer['xchan_photo_s'],
			'$comment' => t('Comment'),
			'$submit' => t('Submit'),
			'$edat' => EMPTY_STR,
			'$edbold' => t('Bold'),
			'$editalic' => t('Italic'),
			'$eduline' => t('Underline'),
			'$edquote' => t('Quote'),
			'$edcode' => t('Code'),
			'$edimg' => t('Image'),
			'$edatt' => t('Attach/Upload file'),
			'$edurl' => t('Insert Link'),
			'$edvideo' => t('Video'),
			'$preview' => t('Preview'), 
			'$reset' => t('Reset'),
			'$indent' => $indent,
			'$can_upload' => (perm_is_allowed($conv->get_profile_owner(),get_observer_hash(),'write_storage') && $conv->is_uploadable()),
			'$feature_encrypt' => ((Apps::system_app_installed($conv->get_profile_owner(),'Secrets')) ? true : false),
			'$feature_markup' => ((Apps::system_app_installed($conv->get_profile_owner(),'Markup')) ? true : false),
			'$encrypt' => t('Encrypt text'),
			'$cipher' => $conv->get_cipher(),
			'$sourceapp' => App::$sourcename,
			'$observer' => get_observer_hash(),
			'$anoncomments' => ((($conv->get_mode() === 'channel' || $conv->get_mode() === 'display') && perm_is_allowed($conv->get_profile_owner(),'','post_comments')) ? true : false),
			'$anonname' => [ 'anonname', t('Your full name (required)') ],
			'$anonmail' => [ 'anonmail', t('Your email address (required)') ],
			'$anonurl'  => [ 'anonurl',  t('Your website URL (optional)') ],
			'$auto_save_draft' => $feature_auto_save_draft,
		));

		return $comment_box;
	}

	private function get_redirect_url() {
		return $this->redirect_url;
	}

	/**
	 * Check if we are a wall to wall item and set the relevant properties
	 */
	protected function check_wall_to_wall() {
		$conv = $this->get_conversation();
		$this->wall_to_wall = false;
		$this->owner_url = '';
		$this->owner_photo = '';
		$this->owner_name = '';
		$this->owner_censored = false;
		
		if($conv->get_mode() === 'channel')
			return;
		
		if($this->is_toplevel() && ($this->get_data_value('author_xchan') != $this->get_data_value('owner_xchan'))) {
			$this->owner_url = chanlink_hash($this->data['owner']['xchan_hash']);
			$this->owner_photo = $this->data['owner']['xchan_photo_m'];
			$this->owner_name = $this->data['owner']['xchan_name'];
			$this->wall_to_wall = true;
		}

		// present friend-of-friend conversations from hyperdrive as relayed posts from the first friend
		// we find among the respondents.
		
		if ($this->is_toplevel() && (! $this->data['owner']['abook_id'])) {
			if ($this->data['children']) {
				$friend = $this->find_a_friend($this->data['children']);
				if ($friend) {
					$this->owner_url = $friend['url'];
					$this->owner_photo = $friend['photo'];
					$this->owner_name = $friend['name'];
					$this->owner_censored = $friend['censored'];
					$this->wall_to_wall = true;
				}
			}
		}
	}

	private function find_a_friend($items) {
		$ret = null;
		if ($items) {
			foreach ($items as $child) {
				if ($child['author']['abook_id'] && (! intval($child['author']['abook_self']))) {
					return [
						'url'   => chanlink_hash($child['author']['xchan_hash']),
						'photo' => $child['author']['xchan_photo_m'],
						'name'  => $child['author']['xchan_name'],
						'censored' => (($child['author']['xchan_censored'] || $child['author']['abook_censor']) ? true : false)
					];
					if ($child['children']) {
						$ret = $this->find_a_friend($child['children']);
						if ($ret) {
							break;
						}
					}
				}
			}
		}
		return $ret;
	}


	private function is_wall_to_wall() {
		return $this->wall_to_wall;
	}

	private function get_owner_url() {
		return $this->owner_url;
	}

	private function get_owner_photo() {
		return $this->owner_photo;
	}

	private function get_owner_name() {
		return $this->owner_name;
	}

	private function is_visiting() {
		return $this->visiting;
	}


}