<?php

require_once('include/items.php');
require_once('include/group.php');
require_once('include/contact_widgets.php');
require_once('include/conversation.php');
require_once('include/acl_selectors.php');


function network_init(&$a) {
	if(! local_channel()) {
		notice( t('Permission denied.') . EOL);
		return;
	}

	if((count($_GET) < 2) || (count($_GET) < 3 && $_GET['JS'])) {
		$network_options = get_pconfig(local_channel(),'system','network_page_default');
		if($network_options)
			goaway('network' . '?f=&' . $network_options);
	}

	$channel = $a->get_channel();
	$a->profile_uid = local_channel();
	head_set_icon($channel['xchan_photo_s']);

}

function network_content(&$a, $update = 0, $load = false) {

	if(! local_channel()) {
		$_SESSION['return_url'] = $a->query_string;
		return login(false);
	}

	if($load)
		$_SESSION['loadtime'] = datetime_convert();

	$arr = array('query' => $a->query_string);

	call_hooks('network_content_init', $arr);

	$channel = $a->get_channel();
	$item_normal = item_normal();

	$datequery = $datequery2 = '';

	$group = 0;

	$nouveau    = false;

	$datequery  = ((x($_GET,'dend') && is_a_date_arg($_GET['dend'])) ? notags($_GET['dend']) : '');
	$datequery2 = ((x($_GET,'dbegin') && is_a_date_arg($_GET['dbegin'])) ? notags($_GET['dbegin']) : '');
	$nouveau    = ((x($_GET,'new')) ? intval($_GET['new']) : 0);
	$gid        = ((x($_GET,'gid')) ? intval($_GET['gid']) : 0);
	$category   = ((x($_REQUEST,'cat')) ? $_REQUEST['cat'] : '');
	$hashtags   = ((x($_REQUEST,'tag')) ? $_REQUEST['tag'] : '');
	$verb       = ((x($_REQUEST,'verb')) ? $_REQUEST['verb'] : '');

	$search = (($_GET['search']) ? $_GET['search'] : '');
	if($search) {
		if(strpos($search,'@') === 0) {
			$r = q("select abook_id from abook left join xchan on abook_xchan = xchan_hash where xchan_name = '%s' and abook_channel = %d limit 1",
				dbesc(substr($search,1)),
				intval(local_channel())
			);
			if($r) {
				$_GET['cid'] = $r[0]['abook_id'];
				$search = $_GET['search'] = '';
			}
		}
		elseif(strpos($search,'#') === 0) {
			$hashtags = substr($search,1);
			$search = $_GET['search'] = '';
		}
	}

	if($datequery)
		$_GET['order'] = 'post';


	// filter by collection (e.g. group)

	if($gid) {
		$r = q("SELECT * FROM groups WHERE id = %d AND uid = %d LIMIT 1",
			intval($gid),
			intval(local_channel())
		);
		if(! $r) {
			if($update)
				killme();
			notice( t('No such group') . EOL );
			goaway($a->get_baseurl(true) . '/network');
			// NOTREACHED
		}

		$group      = $gid;
		$group_hash = $r[0]['hash'];
		$def_acl    = array('allow_gid' => '<' . $r[0]['hash'] . '>');
	}

	$o = '';


	// if no tabs are selected, defaults to comments

	$cid      = ((x($_GET,'cid'))   ? intval($_GET['cid'])   : 0);
	$star     = ((x($_GET,'star'))  ? intval($_GET['star'])  : 0);
	$order    = ((x($_GET,'order')) ? notags($_GET['order']) : 'comment');
	$liked    = ((x($_GET,'liked')) ? intval($_GET['liked']) : 0);
	$conv     = ((x($_GET,'conv'))  ? intval($_GET['conv'])  : 0);
	$spam     = ((x($_GET,'spam'))  ? intval($_GET['spam'])  : 0);
	$cmin     = ((x($_GET,'cmin'))  ? intval($_GET['cmin'])  : 0);
	$cmax     = ((x($_GET,'cmax'))  ? intval($_GET['cmax'])  : 99);
	$firehose = ((x($_GET,'fh'))    ? intval($_GET['fh'])    : 0);
	$file     = ((x($_GET,'file'))  ? $_GET['file']          : '');


	$deftag = '';

	if(x($_GET,'search') || x($_GET,'file'))
		$nouveau = true;
	if($cid) {
		$r = q("SELECT abook_xchan FROM abook WHERE abook_id = %d AND abook_channel = %d LIMIT 1",
			intval($cid),
			intval(local_channel())
		);
		if(! $r) {
			if($update) {
				killme();
			}
			notice( t('No such channel') . EOL );
			goaway($a->get_baseurl(true) . '/network');
			// NOTREACHED
		}
		if($_GET['pf'] === '1')
			$deftag = '@' . t('forum') . '+' . intval($cid) . '+';
		else
			$def_acl = array('allow_cid' => '<' . $r[0]['abook_xchan'] . '>');
	}

	if(! $update) {
		$tabs = network_tabs();
		$o .= $tabs;

		// search terms header
		if($search) {
			$o .= replace_macros(get_markup_template("section_title.tpl"),array(
				'$title' => t('Search Results For:') . ' ' . htmlspecialchars($search, ENT_COMPAT,'UTF-8')
			));
		}

		nav_set_selected('network');

		$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']
		); 

		$private_editing = ((($group || $cid) && (! intval($_GET['pf']))) ? true : false);

		$x = array(
			'is_owner'         => true,
			'allow_location'   => ((intval(get_pconfig($channel['channel_id'],'system','use_browser_location'))) ? '1' : ''),
			'default_location' => $channel['channel_location'],
			'nickname'         => $channel['channel_address'],
			'lockstate'        => (($private_editing || $channel['channel_allow_cid'] || $channel['channel_allow_gid'] || $channel['channel_deny_cid'] || $channel['channel_deny_gid']) ? 'lock' : 'unlock'),
			'acl'              => populate_acl((($private_editing) ? $def_acl : $channel_acl), true, (($channel['channel_r_stream'] & PERMS_PUBLIC) ? t('Public') : '')),
			'bang'             => (($private_editing) ? '!' : ''),
			'visitor'          => true,
			'profile_uid'      => local_channel()
		);
		if($deftag)
			$x['pretext'] = $deftag;

		$status_editor = status_editor($a,$x);
		$o .= $status_editor;
	}


	// We don't have to deal with ACL's on this page. You're looking at everything
	// that belongs to you, hence you can see all of it. We will filter by group if
	// desired.


	$sql_options  = (($star)
		? " and item_starred = 1 "
		: '');

	$sql_nets = '';

	$sql_extra = " AND `item`.`parent` IN ( SELECT `parent` FROM `item` WHERE item_thread_top = 1 $sql_options ) ";

	if($group) {
		$contact_str = '';
		$contacts = group_get_members($group);
		if($contacts) {
			foreach($contacts as $c) {
				if($contact_str)
					$contact_str .= ',';
				$contact_str .= "'" . $c['xchan'] . "'";
			}
		}
		else {
			$contact_str = ' 0 ';
			info( t('Collection is empty'));
		}

		$sql_extra = " AND item.parent IN ( SELECT DISTINCT parent FROM item WHERE true $sql_options AND (( author_xchan IN ( $contact_str ) OR owner_xchan in ( $contact_str )) or allow_gid like '" . protect_sprintf('%<' . dbesc($group_hash) . '>%') . "' ) and id = parent $item_normal ) ";

		$x = group_rec_byhash(local_channel(), $group_hash);

		if($x) {
			$title = replace_macros(get_markup_template("section_title.tpl"),array(
				'$title' => t('Collection: ') . $x['name']
			));
		}

		$o = $tabs;
		$o .= $title;
		$o .= $status_editor;

	}

	elseif($cid) {

		$r = q("SELECT abook.*, xchan.* from abook left join xchan on abook_xchan = xchan_hash where abook_id = %d and abook_channel = %d and abook_blocked = 0 limit 1",
			intval($cid),
			intval(local_channel())
		);
		if($r) {
			$sql_extra = " AND item.parent IN ( SELECT DISTINCT parent FROM item WHERE true $sql_options AND uid = " . intval(local_channel()) . " AND ( author_xchan = '" . dbesc($r[0]['abook_xchan']) . "' or owner_xchan = '" . dbesc($r[0]['abook_xchan']) . "' ) $item_normal ) ";
			$title = replace_macros(get_markup_template("section_title.tpl"),array(
				'$title' => '<a href="' . zid($r[0]['xchan_url']) . '" ><img src="' . zid($r[0]['xchan_photo_s'])  . '" alt="' . urlencode($r[0]['xchan_name']) . '" /></a> <a href="' . zid($r[0]['xchan_url']) . '" >' . $r[0]['xchan_name'] . '</a>'
			));
			$o = $tabs;
			$o .= $title;
			$o .= $status_editor;
		}
		else {
			notice( t('Invalid connection.') . EOL);
			goaway($a->get_baseurl(true) . '/network');
		}
	}

	if(x($category)) {
		$sql_extra .= protect_sprintf(term_query('item', $category, TERM_CATEGORY));
	}
	if(x($hashtags)) {
		$sql_extra .= protect_sprintf(term_query('item', $hashtags, TERM_HASHTAG, TERM_COMMUNITYTAG));
	}

	if(! $update) {
		// The special div is needed for liveUpdate to kick in for this page.
		// We only launch liveUpdate if you aren't filtering in some incompatible
		// way and also you aren't writing a comment (discovered in javascript).

		if($gid || $cid || $cmin || ($cmax != 99) || $star || $liked || $conv || $spam || $nouveau || $list)
			$firehose = 0;

		$maxheight = get_pconfig(local_channel(),'system','network_divmore_height');
		if(! $maxheight)
			$maxheight = 400;


		$o .= '<div id="live-network"></div>' . "\r\n";
		$o .= "<script> var profile_uid = " . local_channel() 
			. "; var profile_page = " . $a->pager['page'] 
			. "; divmore_height = " . intval($maxheight) . "; </script>\r\n";

		$a->page['htmlhead'] .= replace_macros(get_markup_template("build_query.tpl"),array(
			'$baseurl' => z_root(),
			'$pgtype'  => 'network',
			'$uid'     => ((local_channel()) ? local_channel() : '0'),
			'$gid'     => (($gid) ? $gid : '0'),
			'$cid'     => (($cid) ? $cid : '0'),
			'$cmin'    => (($cmin) ? $cmin : '0'),
			'$cmax'    => (($cmax) ? $cmax : '0'),
			'$star'    => (($star) ? $star : '0'),
			'$liked'   => (($liked) ? $liked : '0'),
			'$conv'    => (($conv) ? $conv : '0'),
			'$spam'    => (($spam) ? $spam : '0'),
			'$fh'      => (($firehose) ? $firehose : '0'),
			'$nouveau' => (($nouveau) ? $nouveau : '0'),
			'$wall'    => '0',
			'$list'    => ((x($_REQUEST,'list')) ? intval($_REQUEST['list']) : 0),
			'$page'    => (($a->pager['page'] != 1) ? $a->pager['page'] : 1),
			'$search'  => (($search) ? $search : ''),
			'$order'   => $order,
			'$file'    => $file,
			'$cats'    => $category,
			'$tags'    => $hashtags,
			'$dend'    => $datequery,
			'$mid'     => '',
			'$verb'     => $verb,
			'$dbegin'  => $datequery2
		));
	}

	$sql_extra3 = '';

	if($datequery) {
		$sql_extra3 .= protect_sprintf(sprintf(" AND item.created <= '%s' ", dbesc(datetime_convert(date_default_timezone_get(),'',$datequery))));
	}
	if($datequery2) {
		$sql_extra3 .= protect_sprintf(sprintf(" AND item.created >= '%s' ", dbesc(datetime_convert(date_default_timezone_get(),'',$datequery2))));
	}

	$sql_extra2 = (($nouveau) ? '' : " AND item.parent = item.id ");
	$sql_extra3 = (($nouveau) ? '' : $sql_extra3);

	if(x($_GET,'search')) {
		$search = escape_tags($_GET['search']);
		if(strpos($search,'#') === 0) {
			$sql_extra .= term_query('item',substr($search,1),TERM_HASHTAG,TERM_COMMUNITYTAG);
		}
		else {
			$sql_extra .= sprintf(" AND item.body like '%s' ",
				dbesc(protect_sprintf('%' . $search . '%'))
			);
		}
	}

	if($verb) {
		$sql_extra .= sprintf(" AND item.verb like '%s' ",
			dbesc(protect_sprintf('%' . $verb . '%'))
		);
	}

	if(strlen($file)) {
		$sql_extra .= term_query('item',$file,TERM_FILE);
	}

	if($conv) {
		$sql_extra .= sprintf(" AND parent IN (SELECT distinct(parent) from item where ( author_xchan like '%s' or item_mentionsme = 1 )) ",
			dbesc(protect_sprintf($channel['channel_hash']))
		);
	}

	if($update && ! $load) {

		// only setup pagination on initial page view
		$pager_sql = '';

	}
	else {
		$itemspage = get_pconfig(local_channel(),'system','itemspage');
		$a->set_pager_itemspage(((intval($itemspage)) ? $itemspage : 20));
		$pager_sql = sprintf(" LIMIT %d OFFSET %d ", intval($a->pager['itemspage']), intval($a->pager['start']));
	}


	if(($cmin != 0) || ($cmax != 99)) {

		// Not everybody who shows up in the network stream will be in your address book.
		// By default those that aren't are assumed to have closeness = 99; but this isn't
		// recorded anywhere. So if cmax is 99, we'll open the search up to anybody in
		// the stream with a NULL address book entry.

		$sql_nets .= " AND ";

		if($cmax == 99)
			$sql_nets .= " ( ";

		$sql_nets .= "( abook.abook_closeness >= " . intval($cmin) . " ";
		$sql_nets .= " AND abook.abook_closeness <= " . intval($cmax) . " ) ";

		if($cmax == 99)
			$sql_nets .= " OR abook.abook_closeness IS NULL ) ";


	}

	$abook_uids = " and abook.abook_channel = " . local_channel() . " ";

	if($firehose && (! get_config('system','disable_discover_tab'))) {
		require_once('include/identity.php');
		$sys = get_sys_channel();
		$uids = " and item.uid  = " . intval($sys['channel_id']) . " ";
		$a->data['firehose'] = intval($sys['channel_id']);
	}
	else {
		$uids = " and item.uid = " . local_channel() . " ";
	}

	if(get_pconfig(local_channel(),'system','network_list_mode'))
		$page_mode = 'list';
	else
		$page_mode = 'client';

	$simple_update = (($update) ? " and item_unseen = 1 " : '');

	// This fixes a very subtle bug so I'd better explain it. You wake up in the morning or return after a day
	// or three and look at your matrix page - after opening up your browser. The first page loads just as it
	// should. All of a sudden a few seconds later, page 2 will get inserted at the beginning of the page
	// (before the page 1 content). The update code is actually doing just what it's supposed
	// to, it's fetching posts that have the ITEM_UNSEEN bit set. But the reason that page 2 content is being
	// returned in an UPDATE is because you hadn't gotten that far yet - you're still on page 1 and everything
	// that we loaded for page 1 is now marked as seen. But the stuff on page 2 hasn't been. So... it's being
	// treated as "new fresh" content because it is unseen. We need to distinguish it somehow from content
	// which "arrived as you were reading page 1". We're going to do this
	// by storing in your session the current UTC time whenever you LOAD a network page, and only UPDATE items
	// which are both ITEM_UNSEEN and have "changed" since that time. Cross fingers...

	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($nouveau && $load) {
		// "New Item View" - show all items unthreaded in reverse created date order

		$items = q("SELECT item.*, item.id AS item_id, received FROM item
			left join abook on ( item.owner_xchan = abook.abook_xchan $abook_uids )
			WHERE true $uids $item_normal
			and (abook.abook_blocked = 0 or abook.abook_flags is null)
			$simple_update
			$sql_extra $sql_nets
			ORDER BY item.received DESC $pager_sql "
		);

		require_once('include/items.php');

		xchan_query($items);

		$items = fetch_post_tags($items,true);
	}
	elseif($update) {

		// Normal conversation view

		if($order === 'post')
				$ordering = "created";
		else
				$ordering = "commented";

		if($load) {

			// Fetch a page full of parent items for this page

			$r = q("SELECT distinct item.id AS item_id, $ordering FROM item
				left join abook on ( item.owner_xchan = abook.abook_xchan $abook_uids )
				WHERE true $uids $item_normal
				AND item.parent = item.id
				and (abook.abook_blocked = 0 or abook.abook_flags is null)
				$sql_extra3 $sql_extra $sql_nets
				ORDER BY $ordering DESC $pager_sql "
			);

		}
		else {
			// this is an update
			$r = q("SELECT item.parent AS item_id FROM item
				left join abook on ( item.owner_xchan = abook.abook_xchan $abook_uids )
				WHERE true $uids $item_normal $simple_update
				and (abook.abook_blocked = 0 or abook.abook_flags is null)
				$sql_extra3 $sql_extra $sql_nets "
			);
			$_SESSION['loadtime'] = datetime_convert();
		}

		// Then fetch all the children of the parents that are on this page
		$parents_str = '';
		$update_unseen = '';

		if($r) {

			$parents_str = ids_to_querystr($r,'item_id');

			$items = q("SELECT item.*, item.id AS item_id FROM item
				WHERE true $uids $item_normal
				AND item.parent IN ( %s )
				$sql_extra ",
				dbesc($parents_str)
			);

			xchan_query($items,true,(($firehose) ? local_channel() : 0));
			$items = fetch_post_tags($items,true);
			$items = conv_sort($items,$ordering);
		}
		else {
			$items = array();
		}

		if($page_mode === 'list') {

			/**
			 * in "list mode", only mark the parent item and any like activities as "seen". 
			 * We won't distinguish between comment likes and post likes. The important thing
			 * is that the number of unseen comments will be accurate. The SQL to separate the
			 * comment likes could also get somewhat hairy. 
			 */

			if($parents_str) {
				$update_unseen = " AND ( id IN ( " . dbesc($parents_str) . " )";
				$update_unseen .= " OR ( parent IN ( " . dbesc($parents_str) . " ) AND verb in ( '" . dbesc(ACTIVITY_LIKE) . "','" . dbesc(ACTIVITY_DISLIKE) . "' ))) ";
			}
		}
		else {
			if($parents_str) {
				$update_unseen = " AND parent IN ( " . dbesc($parents_str) . " )";
			}
		}
	}

	if(($update_unseen) && (! $firehose))
		$r = q("UPDATE item SET item_unseen = 0 WHERE item_unseen = 1 AND uid = %d $update_unseen ",
			intval(local_channel())
		);

	$mode = (($nouveau) ? 'network-new' : 'network');

	$o .= conversation($a,$items,$mode,$update,$page_mode);

	if(($items) && (! $update))
		$o .= alt_pager($a,count($items));

	return $o;
}
