<?php
namespace Zotlabs\Module;

require_once("include/bbcode.php");
require_once('include/security.php');
require_once('include/conversation.php');
require_once('include/acl_selectors.php');
require_once('include/items.php');


class Display extends \Zotlabs\Web\Controller {

	function get($update = 0, $load = false) {

		$checkjs = new \Zotlabs\Web\CheckJS(1);
	
		if($load)
			$_SESSION['loadtime'] = datetime_convert();
	
		if(observer_prohibited()) {
			notice( t('Public access denied.') . EOL);
			return;
		}
	
		if(argc() > 1 && argv(1) !== 'load')
			$item_hash = argv(1);
	
		if($_REQUEST['mid'])
			$item_hash = $_REQUEST['mid'];

		if(! $item_hash) {
			\App::$error = 404;
			notice( t('Item not found.') . EOL);
			return;
		}
	
		$observer_is_owner = false;
		$updateable = false;

		if(local_channel() && (! $update)) {
	
			$channel = \App::get_channel();

			$channel_acl = array(
				'allow_cid' => $channel['channel_allow_cid'], 
				'allow_gid' => $channel['channel_allow_gid'], 
				'deny_cid' => $channel['channel_deny_cid'], 
				'deny_gid' => $channel['channel_deny_gid']
			); 

			$x = array(
				'is_owner' => true,
				'allow_location' => ((intval(get_pconfig($channel['channel_id'],'system','use_browser_location'))) ? '1' : ''),
				'default_location' => $channel['channel_location'],
				'nickname' => $channel['channel_address'],
				'lockstate' => (($group || $cid || $channel['channel_allow_cid'] || $channel['channel_allow_gid'] || $channel['channel_deny_cid'] || $channel['channel_deny_gid']) ? 'lock' : 'unlock'),
	
				'acl' => populate_acl($channel_acl),
				'permissions' => $channel_acl,
				'bang' => '',
				'visitor' => true,
				'profile_uid' => local_channel(),
				'return_path' => 'channel/' . $channel['channel_address'],
				'expanded' => true,
				'editor_autocomplete' => true,
				'bbco_autocomplete' => 'bbcode',
				'bbcode' => true,
				'jotnets' => true
			);
	
			$o = '<div id="jot-popup">';
			$o .= status_editor($a,$x);
			$o .= '</div>';
		}
	
		// This page can be viewed by anybody so the query could be complicated
		// First we'll see if there is a copy of the item which is owned by us - if we're logged in locally.
		// If that fails (or we aren't logged in locally), 
		// query an item in which the observer (if logged in remotely) has cid or gid rights
		// and if that fails, look for a copy of the post that has no privacy restrictions.  
		// If we find the post, but we don't find a copy that we're allowed to look at, this fact needs to be reported.
	
		// find a copy of the item somewhere
	
		$target_item = null;

		if(strpos($item_hash,'b64.') === 0)
			$decoded = @base64url_decode(substr($item_hash,4));
		if($decoded)
			$item_hash = $decoded;

		$r = q("select id, uid, mid, parent_mid, thr_parent, verb, item_type, item_deleted from item where mid like '%s' limit 1",
			dbesc($item_hash . '%')
		);
	
		if($r) {
			$target_item = $r[0];
		}
	
		$r = null;
	
		if($target_item['item_type']  == ITEM_TYPE_WEBPAGE) {
			$x = q("select * from channel where channel_id = %d limit 1",
				intval($target_item['uid'])
			);
			$y = q("select * from iconfig left join item on iconfig.iid = item.id 
				where item.uid = %d and iconfig.cat = 'system' and iconfig.k = 'WEBPAGE' and item.id = %d limit 1",
				intval($target_item['uid']),
				intval($target_item['id'])
			);
			if($x && $y) {
				goaway(z_root() . '/page/' . $x[0]['channel_address'] . '/' . $y[0]['v']);
			}
			else {
				notice( t('Page not found.') . EOL);
			 	return '';
			}
		}
		
		$static = ((array_key_exists('static',$_REQUEST)) ? intval($_REQUEST['static']) : 0);
	
	
		$simple_update = (($update) ? " AND item_unseen = 1 " : '');
			
		if($update && $_SESSION['loadtime'])
			$simple_update = " AND (( item_unseen = 1 AND item.changed > '" . datetime_convert('UTC','UTC',$_SESSION['loadtime']) . "' )  OR item.changed > '" . datetime_convert('UTC','UTC',$_SESSION['loadtime']) . "' ) ";
		if($load)
			$simple_update = '';
	
		if($static && $simple_update)
			$simple_update .= " and item_thread_top = 0 and author_xchan = '" . protect_sprintf(get_observer_hash()) . "' ";
	
		if((! $update) && (! $load)) {

			$static  = ((local_channel()) ? channel_manual_conv_update(local_channel()) : 1);

			//if the target item is not a post (eg a like) we want to address its thread parent
			$mid = ((($target_item['verb'] == ACTIVITY_LIKE) || ($target_item['verb'] == ACTIVITY_DISLIKE)) ? $target_item['thr_parent'] : $target_item['mid']);

			//if we got a decoded hash we must encode it again before handing to javascript 
			if($decoded)
				$mid = 'b64.' . base64url_encode($mid);

			$o .= '<div id="live-display"></div>' . "\r\n";
			$o .= "<script> var profile_uid = " . ((intval(local_channel())) ? local_channel() : (-1))
				. "; var netargs = '?f='; var profile_page = " . \App::$pager['page'] . "; </script>\r\n";
	
			\App::$page['htmlhead'] .= replace_macros(get_markup_template("build_query.tpl"),array(
				'$baseurl' => z_root(),
				'$pgtype' => 'display',
				'$uid' => '0',
				'$gid' => '0',
				'$cid' => '0',
				'$cmin' => '0',
				'$cmax' => '99',
				'$star' => '0',
				'$liked' => '0',
				'$conv' => '0',
				'$spam' => '0',
				'$fh' => '0',
				'$nouveau' => '0',
				'$wall' => '0',
				'$static' => $static,
				'$page' => ((\App::$pager['page'] != 1) ? \App::$pager['page'] : 1),
				'$list' => ((x($_REQUEST,'list')) ? intval($_REQUEST['list']) : 0),
				'$search' => '',
				'$xchan' => '',
				'$order' => '',
				'$file' => '',
				'$cats' => '',
				'$tags' => '',
				'$dend' => '',
				'$dbegin' => '',
				'$verb' => '',
				'$mid' => $mid
			));

			head_add_link([ 
				'rel'   => 'alternate',
				'type'  => 'application/json+oembed',
				'href'  => z_root() . '/oep?f=&url=' . urlencode(z_root() . '/' . \App::$query_string),
				'title' => 'oembed'
			]);

		}

		$observer_hash = get_observer_hash();
		$item_normal = item_normal();
		$item_normal_update = item_normal_update();

		$sql_extra = public_permissions_sql($observer_hash);

		if(($update && $load) || ($checkjs->disabled())) {

			$pager_sql = sprintf(" LIMIT %d OFFSET %d ", intval(\App::$pager['itemspage']),intval(\App::$pager['start']));

			if($load || ($checkjs->disabled())) {
				$r = null;

				require_once('include/channel.php');
				$sys = get_sys_channel();
				$sysid = $sys['channel_id'];

				if(local_channel()) {
					$r = q("SELECT item.id as item_id from item
						WHERE uid = %d
						and mid = '%s'
						$item_normal
						limit 1",
						intval(local_channel()),
						dbesc($target_item['parent_mid'])
					);
					if($r) {
						$updateable = true;
					}
				}

				if($r === null) {

					// in case somebody turned off public access to sys channel content using permissions
					// make that content unsearchable by ensuring the owner uid can't match

					if(! perm_is_allowed($sysid,$observer_hash,'view_stream'))
						$sysid = 0;

					$r = q("SELECT item.id as item_id from item
						WHERE mid = '%s'
						AND (((( item.allow_cid = ''  AND item.allow_gid = '' AND item.deny_cid  = '' 
						AND item.deny_gid  = '' AND item_private = 0 ) 
						and uid in ( " . stream_perms_api_uids(($observer_hash) ? (PERMS_NETWORK|PERMS_PUBLIC) : PERMS_PUBLIC) . " ))
						OR uid = %d )
						$sql_extra )
						$item_normal
						limit 1",
						dbesc($target_item['parent_mid']),
						intval($sysid)
					);
				}
			}
		}
	
		elseif($update && !$load) {
			$r = null;
	
			require_once('include/channel.php');
			$sys = get_sys_channel();
			$sysid = $sys['channel_id'];

			if(local_channel()) {
				$r = q("SELECT item.parent AS item_id from item
					WHERE uid = %d
					and parent_mid = '%s'
					$item_normal_update
					$simple_update
					limit 1",
					intval(local_channel()),
					dbesc($target_item['parent_mid'])
				);
				if($r) {
					$updateable = true;
				}
			}

			if($r === null) {
				// in case somebody turned off public access to sys channel content using permissions
				// make that content unsearchable by ensuring the owner_xchan can't match
				if(! perm_is_allowed($sysid,$observer_hash,'view_stream'))
					$sysid = 0;

				$r = q("SELECT item.parent AS item_id from item
					WHERE parent_mid = '%s'
					AND (((( item.allow_cid = ''  AND item.allow_gid = '' AND item.deny_cid  = '' 
					AND item.deny_gid  = '' AND item_private = 0 ) 
					and uid in ( " . stream_perms_api_uids(($observer_hash) ? (PERMS_NETWORK|PERMS_PUBLIC) : PERMS_PUBLIC) . " ))
					OR uid = %d )
					$sql_extra )
					$item_normal_update
					$simple_update
					limit 1",
					dbesc($target_item['parent_mid']),
					intval($sysid)
				);
			}
			$_SESSION['loadtime'] = datetime_convert();
		}
	
		else {
			$r = array();
		}
	
		if($r) {
			$parents_str = ids_to_querystr($r,'item_id');
			if($parents_str) {
				$items = q("SELECT item.*, item.id AS item_id 
					FROM item
					WHERE parent in ( %s ) $item_normal ",
					dbesc($parents_str)
				);
	
				xchan_query($items);
				$items = fetch_post_tags($items,true);
				$items = conv_sort($items,'created');
			}
		}
		else {
			$items = array();
		}
	
		if ($checkjs->disabled()) {
			$o .= conversation($items, 'display', $update, 'traditional');
			if ($items[0]['title'])
				\App::$page['title'] = $items[0]['title'] . " - " . \App::$page['title'];
		} 
		else {
			$o .= conversation($items, 'display', $update, 'client');
		}
	
		if($updateable) {
			$x = q("UPDATE item SET item_unseen = 0 where item_unseen = 1 AND uid = %d and parent = %d ",
				intval(local_channel()),
				intval($r[0]['item_id'])
			);
		}

		$o .= '<div id="content-complete"></div>';

		if((($update && $load) || $checkjs->disabled()) && (! $items))  {
			
			$r = q("SELECT id, item_deleted FROM item WHERE mid = '%s' LIMIT 1",
				dbesc($item_hash)
			);

			if($r) {
				if(intval($r[0]['item_deleted'])) {
					notice( t('Item has been removed.') . EOL );
				}
				else {	
					notice( t('Permission denied.') . EOL ); 
				}
			}
			else {
				notice( t('Item not found.') . EOL );
			}
	
		}

		return $o;

	}

}