<?php
/**
 * @file include/channel.php
 */

require_once('include/zot.php');
require_once('include/crypto.php');
require_once('include/menu.php');
require_once('include/perm_upgrade.php');

/**
 * @brief Called when creating a new channel.
 *
 * Checks the account's service class and number of current channels to determine
 * whether creating a new channel is within the current service class constraints.
 *
 * @param int $account_id
 *     Account_id used for this request
 *
 * @returns associative array with:
 *  * \e boolean \b success boolean true if creating a new channel is allowed for this account
 *  * \e string \b message (optional) if success is false, optional error text
 *  * \e int \b total_identities
 */
function identity_check_service_class($account_id) {
	$ret = array('success' => false, 'message' => '');

	$r = q("select count(channel_id) as total from channel where channel_account_id = %d and channel_removed = 0 ",
		intval($account_id)
	);
	if(! ($r && count($r))) {
		$ret['total_identities'] = 0;
		$ret['message'] = t('Unable to obtain identity information from database');
		return $ret;
	}

	$ret['total_identities'] = intval($r[0]['total']);

	if (! account_service_class_allows($account_id, 'total_identities', $r[0]['total'])) {
		$ret['message'] .= upgrade_message();
		return $ret;
	}

	$ret['success'] = true;

	return $ret;
}


/**
 * @brief Determine if the channel name is allowed when creating a new channel.
 *
 * This action is pluggable.
 * We're currently only checking for an empty name or one that exceeds our
 * storage limit (255 chars). 255 chars is probably going to create a mess on
 * some pages.
 * Plugins can set additional policies such as full name requirements, character
 * sets, multi-byte length, etc.
 *
 * @param string $name
 *
 * @returns nil return if name is valid, or string describing the error state.
 */
function validate_channelname($name) {

	if (! $name)
		return t('Empty name');

	if (strlen($name) > 255)
		return t('Name too long');

	$arr = array('name' => $name);
	call_hooks('validate_channelname', $arr);

	if (x($arr, 'message'))
		return $arr['message'];
}


/**
 * @brief Create a system channel - which has no account attached.
 *
 */
function create_sys_channel() {
	if (get_sys_channel())
		return;

	// Ensure that there is a host keypair.

	if ((! get_config('system', 'pubkey')) && (! get_config('system', 'prvkey'))) {
		require_once('include/crypto.php');
		$hostkey = new_keypair(4096);
		set_config('system', 'pubkey', $hostkey['pubkey']);
		set_config('system', 'prvkey', $hostkey['prvkey']);
	}

	create_identity(array(
		'account_id' => 'xxx',  // This will create an identity with an (integer) account_id of 0, but account_id is required
		'nickname' => 'sys',
		'name' => 'System',
		'pageflags' => 0,
		'publish' => 0,
		'system' => 1
	));
}


/**
 * @brief Returns the sys channel.
 *
 * @return array|boolean
 */
function get_sys_channel() {
	$r = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_system = 1 limit 1");

	if ($r)
		return $r[0];

	return false;
}


/**
 * @brief Checks if $channel_id is sys channel.
 *
 * @param int $channel_id
 * @return boolean
 */
function is_sys_channel($channel_id) {
	$r = q("select channel_system from channel where channel_id = %d and channel_system = 1 limit 1",
		intval($channel_id)
	);

	if($r)
		return true;

	return false;
}


/**
 * @brief Return the total number of channels on this site.
 *
 * No filtering is performed except to check PAGE_REMOVED.
 *
 * @returns int|booleean
 *   on error returns boolean false
 */
function channel_total() {
	$r = q("select channel_id from channel where channel_removed = 0");

	if (is_array($r))
		return count($r);

	return false;
}


/**
 * @brief Create a new channel.
 *
 * Also creates the related xchan, hubloc, profile, and "self" abook records,
 * and an empty "Friends" group/collection for the new channel.
 *
 * @param array $arr assoziative array with:
 *  * \e string \b name full name of channel
 *  * \e string \b nickname "email/url-compliant" nickname
 *  * \e int \b account_id to attach with this channel
 *  * [other identity fields as desired]
 *
 * @returns array
 *     'success' => boolean true or false
 *     'message' => optional error text if success is false
 *     'channel' => if successful the created channel array
 */
function create_identity($arr) {

	$ret = array('success' => false);

	if(! $arr['account_id']) {
	$ret['message'] = t('No account identifier');
		return $ret;
	}
	$ret = identity_check_service_class($arr['account_id']);
	if (!$ret['success']) { 
		return $ret;
	}
	// save this for auto_friending
	$total_identities = $ret['total_identities'];

	$nick = mb_strtolower(trim($arr['nickname']));
	if(! $nick) {
		$ret['message'] = t('Nickname is required.');
		return $ret;
	}

	$name = escape_tags($arr['name']);
	$pageflags = ((x($arr,'pageflags')) ? intval($arr['pageflags']) : PAGE_NORMAL);
	$system = ((x($arr,'system')) ? intval($arr['system']) : 0);
	$name_error = validate_channelname($arr['name']);
	if($name_error) {
		$ret['message'] = $name_error;
		return $ret;
	}

	if($nick === 'sys' && (! $system)) {
		$ret['message'] = t('Reserved nickname. Please choose another.');
		return $ret;
	}

	if(check_webbie(array($nick)) !== $nick) {
		$ret['message'] = t('Nickname has unsupported characters or is already being used on this site.');
		return $ret;
	}

	$guid = zot_new_uid($nick);
	$key = new_keypair(4096);

	$sig = base64url_encode(rsa_sign($guid,$key['prvkey']));
	$hash = make_xchan_hash($guid,$sig);

	// Force a few things on the short term until we can provide a theme or app with choice

	$publish = 1;

	if(array_key_exists('publish', $arr))
		$publish = intval($arr['publish']);

	$role_permissions = null;

	if(array_key_exists('permissions_role',$arr) && $arr['permissions_role']) {
		$role_permissions = \Zotlabs\Access\PermissionRoles::role_perms($arr['permissions_role']);
	}

	if($role_permissions && array_key_exists('directory_publish',$role_permissions))
		$publish = intval($role_permissions['directory_publish']);

	$primary = true;
		
	if(array_key_exists('primary', $arr))
		$primary = intval($arr['primary']);

	$expire = 0;

	$r = q("insert into channel ( channel_account_id, channel_primary, 
		channel_name, channel_address, channel_guid, channel_guid_sig,
		channel_hash, channel_prvkey, channel_pubkey, channel_pageflags, channel_system, channel_expire_days, channel_timezone )
		values ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, %d, '%s' ) ",

		intval($arr['account_id']),
		intval($primary),
		dbesc($name),
		dbesc($nick),
		dbesc($guid),
		dbesc($sig),
		dbesc($hash),
		dbesc($key['prvkey']),
		dbesc($key['pubkey']),
		intval($pageflags),
		intval($system),
		intval($expire),
		dbesc(App::$timezone)
	);

	$r = q("select * from channel where channel_account_id = %d 
		and channel_guid = '%s' limit 1",
		intval($arr['account_id']),
		dbesc($guid)
	);

	if(! $r) {
		$ret['message'] = t('Unable to retrieve created identity');
		return $ret;
	}

	if($role_permissions && array_key_exists('limits',$role_permissions))
		$perm_limits = $role_permissions['limits'];
	else
		$perm_limits = site_default_perms();

	foreach($perm_limits as $p => $v)
		\Zotlabs\Access\PermissionLimits::Set($r[0]['channel_id'],$p,$v);

	if($role_permissions && array_key_exists('perms_auto',$role_permissions))
		set_pconfig($r[0]['channel_id'],'system','autoperms',intval($role_permissions['perms_auto']));

	$ret['channel'] = $r[0];

	if(intval($arr['account_id']))
		set_default_login_identity($arr['account_id'],$ret['channel']['channel_id'],false);

	// Create a verified hub location pointing to this site.

	$r = q("insert into hubloc ( hubloc_guid, hubloc_guid_sig, hubloc_hash, hubloc_addr, hubloc_primary, 
		hubloc_url, hubloc_url_sig, hubloc_host, hubloc_callback, hubloc_sitekey, hubloc_network )
		values ( '%s', '%s', '%s', '%s', %d, '%s', '%s', '%s', '%s', '%s', '%s' )",
		dbesc($guid),
		dbesc($sig),
		dbesc($hash),
		dbesc($ret['channel']['channel_address'] . '@' . App::get_hostname()),
		intval($primary),
		dbesc(z_root()),
		dbesc(base64url_encode(rsa_sign(z_root(),$ret['channel']['channel_prvkey']))),
		dbesc(App::get_hostname()),
		dbesc(z_root() . '/post'),
		dbesc(get_config('system','pubkey')),
		dbesc('zot')
	);
	if(! $r)
		logger('create_identity: Unable to store hub location');

	$newuid = $ret['channel']['channel_id'];

	$r = q("insert into xchan ( xchan_hash, xchan_guid, xchan_guid_sig, xchan_pubkey, xchan_photo_l, xchan_photo_m, xchan_photo_s, xchan_addr, xchan_url, xchan_follow, xchan_connurl, xchan_name, xchan_network, xchan_photo_date, xchan_name_date, xchan_system ) values ('%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d)",
		dbesc($hash),
		dbesc($guid),
		dbesc($sig),
		dbesc($key['pubkey']),
		dbesc(z_root() . "/photo/profile/l/{$newuid}"),
		dbesc(z_root() . "/photo/profile/m/{$newuid}"),
		dbesc(z_root() . "/photo/profile/s/{$newuid}"),
		dbesc($ret['channel']['channel_address'] . '@' . App::get_hostname()),
		dbesc(z_root() . '/channel/' . $ret['channel']['channel_address']),
		dbesc(z_root() . '/follow?f=&url=%s'),
		dbesc(z_root() . '/poco/' . $ret['channel']['channel_address']),
		dbesc($ret['channel']['channel_name']),
		dbesc('zot'),
		dbesc(datetime_convert()),
		dbesc(datetime_convert()),
		intval($system)
	);

	// Not checking return value.
	// It's ok for this to fail if it's an imported channel, and therefore the hash is a duplicate

	$r = q("INSERT INTO profile ( aid, uid, profile_guid, profile_name, is_default, publish, fullname, photo, thumb)
		VALUES ( %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s') ",
		intval($ret['channel']['channel_account_id']),
		intval($newuid),
		dbesc(random_string()),
		t('Default Profile'),
		1,
		$publish,
		dbesc($ret['channel']['channel_name']),
		dbesc(z_root() . "/photo/profile/l/{$newuid}"),
		dbesc(z_root() . "/photo/profile/m/{$newuid}")
	);

	if($role_permissions) {
		$myperms = ((array_key_exists('perms_connect',$role_permissions)) ? $role_permissions['perms_connect'] : array());
	}
	else {
		$x = \Zotlabs\Access\PermissionRoles::role_perms('social');
		$myperms = $x['perms_connect'];
	}

	$r = q("insert into abook ( abook_account, abook_channel, abook_xchan, abook_closeness, abook_created, abook_updated, abook_self )
		values ( %d, %d, '%s', %d, '%s', '%s', %d ) ",
		intval($ret['channel']['channel_account_id']),
		intval($newuid),
		dbesc($hash),
		intval(0),
		dbesc(datetime_convert()),
		dbesc(datetime_convert()),
		intval(1)
	);

	$x = \Zotlabs\Access\Permissions::FilledPerms($myperms);
	foreach($x as $k => $v) {
		set_abconfig($newuid,$hash,'my_perms',$k,$v);
	}

	if(intval($ret['channel']['channel_account_id'])) {

		// Save our permissions role so we can perhaps call it up and modify it later.

		if($role_permissions) {
			set_pconfig($newuid,'system','permissions_role',$arr['permissions_role']);
			if(array_key_exists('online',$role_permissions))
				set_pconfig($newuid,'system','hide_presence',1-intval($role_permissions['online']));
			if(array_key_exists('perms_auto',$role_permissions)) {
				$autoperms = intval($role_permissions['perms_auto']);
				set_pconfig($newuid,'system','autoperms',$autoperms);
				if($autoperms) {
					$x = \Zotlabs\Access\Permissions::FilledPerms($role_permissions['perms_connect']);
					foreach($x as $k => $v) {
						set_pconfig($newuid,'autoperms',$k,$v);
					}
				}
				else {
					$r = q("delete from pconfig where uid = %d and cat = 'autoperms'",
						intval($newuid)
					);
				}
			}						
		}

		// Create a group with yourself as a member. This allows somebody to use it 
		// right away as a default group for new contacts. 

		require_once('include/group.php');
		group_add($newuid, t('Friends'));
		group_add_member($newuid,t('Friends'),$ret['channel']['channel_hash']);

		// if our role_permissions indicate that we're using a default collection ACL, add it.

		if(is_array($role_permissions) && $role_permissions['default_collection']) {
			$r = q("select hash from groups where uid = %d and gname = '%s' limit 1",
				intval($newuid),
				dbesc( t('Friends') )
			);
			if($r) {
				q("update channel set channel_default_group = '%s', channel_allow_gid = '%s' where channel_id = %d",
					dbesc($r[0]['hash']),
					dbesc('<' . $r[0]['hash'] . '>'),
					intval($newuid)
				);
			}
		}

		if(! $system) {
			set_pconfig($ret['channel']['channel_id'],'system','photo_path', '%Y-%m');
			set_pconfig($ret['channel']['channel_id'],'system','attach_path','%Y-%m');
		}
		
		// UNO: channel defaults, incl addons (addons specific pconfig will only work after the relevant addon is enabled by the admin). It's located here, so members can modify these defaults after the channel is created.
		if(UNO) {
			//diaspora protocol addon
			set_pconfig($ret['channel']['channel_id'],'system','diaspora_allowed', '1');
			set_pconfig($ret['channel']['channel_id'],'system','diaspora_public_comments', '1');
			set_pconfig($ret['channel']['channel_id'],'system','prevent_tag_hijacking', '0');
		}
		
		// auto-follow any of the hub's pre-configured channel choices.
		// Only do this if it's the first channel for this account;
		// otherwise it could get annoying. Don't make this list too big
		// or it will impact registration time.

		$accts = get_config('system','auto_follow');
		if(($accts) && (! $total_identities)) {
			require_once('include/follow.php');
			if(! is_array($accts))
				$accts = array($accts);
			foreach($accts as $acct) {
				if(trim($acct))
					new_contact($newuid,trim($acct),$ret['channel'],false);
			}
		}

		call_hooks('create_identity', $newuid);

		Zotlabs\Daemon\Master::Summon(array('Directory', $ret['channel']['channel_id']));
	}

	$ret['success'] = true;
	return $ret;
}

/**
 * @brief Set default channel to be used on login.
 *
 * @param int $account_id
 *       login account
 * @param int $channel_id
 *       channel id to set as default for this account
 * @param boolean $force
 *       if true, set this default unconditionally
 *       if $force is false only do this if there is no existing default
 */
function set_default_login_identity($account_id, $channel_id, $force = true) {
	$r = q("select account_default_channel from account where account_id = %d limit 1",
		intval($account_id)
	);
	if ($r) {
		if ((intval($r[0]['account_default_channel']) == 0) || ($force)) {
			$r = q("update account set account_default_channel = %d where account_id = %d",
				intval($channel_id),
				intval($account_id)
			);
		}
	}
}

/**
 * @brief Create an array representing the important channel information
 * which would be necessary to create a nomadic identity clone. This includes
 * most channel resources and connection information with the exception of content.
 *
 * @param int $channel_id
 *     Channel_id to export
 * @param boolean $items
 *     Include channel posts (wall items), default false
 *
 * @returns array
 *     See function for details
 */
function identity_basic_export($channel_id, $items = false) {

	/*
	 * Red basic channel export
	 */

	$ret = array();

	// use constants here as otherwise we will have no idea if we can import from a site 
	// with a non-standard platform and version.
	$ret['compatibility'] = array('project' => PLATFORM_NAME, 'version' => STD_VERSION, 'database' => DB_UPDATE_VERSION, 'server_role' => Zotlabs\Lib\System::get_server_role());

	$r = q("select * from channel where channel_id = %d limit 1",
		intval($channel_id)
	);
	if($r) {
		translate_channel_perms_outbound($r[0]);
		$ret['channel'] = $r[0];		
		$ret['relocate'] = [ 'channel_address' => $r[0]['channel_address'], 'url' => z_root()];
	}

	$r = q("select * from profile where uid = %d",
		intval($channel_id)
	);
	if($r)
		$ret['profile'] = $r;

	$xchans = array();
	$r = q("select * from abook where abook_channel = %d ",
		intval($channel_id)
	);
	if($r) {
		$ret['abook'] = $r;

		for($x = 0; $x < count($ret['abook']); $x ++) {
			$xchans[] = $ret['abook'][$x]['abook_chan'];
			$abconfig = load_abconfig($channel_id,$ret['abook'][$x]['abook_xchan']);
			if($abconfig)
				$ret['abook'][$x]['abconfig'] = $abconfig;
			translate_abook_perms_outbound($ret['abook'][$x]);
		}		 
		stringify_array_elms($xchans);
	}

	if($xchans) {
		$r = q("select * from xchan where xchan_hash in ( " . implode(',',$xchans) . " ) ");
		if($r)
			$ret['xchan'] = $r;
		
		$r = q("select * from hubloc where hubloc_hash in ( " . implode(',',$xchans) . " ) ");
		if($r)
			$ret['hubloc'] = $r;
	}

	$r = q("select * from `groups` where uid = %d ",
		intval($channel_id)
	);

	if($r)
		$ret['group'] = $r;

	$r = q("select * from group_member where uid = %d ",
		intval($channel_id)
	);
	if($r)
		$ret['group_member'] = $r;

	$r = q("select * from pconfig where uid = %d",
		intval($channel_id)
	);
	if($r)
		$ret['config'] = $r;

	$r = q("select mimetype, content, os_storage from photo where imgscale = 4 and photo_usage = %d and uid = %d limit 1",
		intval(PHOTO_PROFILE),
		intval($channel_id)
	);

	if($r) {
		$ret['photo'] = array('type' => $r[0]['mimetype'], 'data' => (($r[0]['os_storage']) ? base64url_encode(file_get_contents($r[0]['content'])) : base64url_encode($r[0]['content'])));
	}

	// All other term types will be included in items, if requested.

	$r = q("select * from term where ttype in (%d,%d) and uid = %d",
		intval(TERM_SAVEDSEARCH),
		intval(TERM_THING),
		intval($channel_id)
	);
	if($r)
		$ret['term'] = $r;


	// add psuedo-column obj_baseurl to aid in relocations

	$r = q("select obj.*, '%s' as obj_baseurl from obj where obj_channel = %d",
		dbesc(z_root()),
		intval($channel_id)
	);

	if($r)
		$ret['obj'] = $r;

	$r = q("select * from app where app_channel = %d and app_system = 0",
		intval($channel_id)
	);
	if($r) {
		for($x = 0; $x < count($r); $x ++) {
			$r[$x]['term'] = q("select * from term where otype = %d and oid = %d",
				intval(TERM_OBJ_APP),
				intval($r[$x]['id'])
			);
		}
		$ret['app'] = $r;
	}

	$r = q("select * from chatroom where cr_uid = %d",
		intval($channel_id)
	);
	if($r)
		$ret['chatroom'] = $r;


	$r = q("select * from event where uid = %d",
		intval($channel_id)
	);
	if($r)
		$ret['event'] = $r;

	$r = q("select * from item where resource_type = 'event' and uid = %d",
		intval($channel_id)
	);
	if($r) {
		$ret['event_item'] = array();
		xchan_query($r);
		$r = fetch_post_tags($r,true);
		foreach($r as $rr)
			$ret['event_item'][] = encode_item($rr,true);
	}
	
	$x = menu_list($channel_id);
	if($x) {
		$ret['menu'] = array();
		for($y = 0; $y < count($x); $y ++) {
			$m = menu_fetch($x[$y]['menu_name'],$channel_id,$ret['channel']['channel_hash']);
			if($m)
				$ret['menu'][] = menu_element($ret['channel'],$m);
		}
	}


	$addon = array('channel_id' => $channel_id,'data' => $ret);
	call_hooks('identity_basic_export',$addon);
	$ret = $addon['data'];


	if(! $items)
		return $ret;

	$r = q("select * from likes where channel_id = %d",
		intval($channel_id)
	);

	if($r)
		$ret['likes'] = $r;


	$r = q("select * from conv where uid = %d",
		intval($channel_id)
	);
	if($r) {
		for($x = 0; $x < count($r); $x ++) {
			$r[$x]['subject'] = base64url_decode(str_rot47($r[$x]['subject']));
		}		
		$ret['conv'] = $r;
	}


	$r = q("select * from mail where mail.uid = %d",
		intval($channel_id)
	);
	if($r) {
		$m = array();
		foreach($r as $rr) {
			xchan_mail_query($rr);
			$m[] = mail_encode($rr,true);
		}
		$ret['mail'] = $m;
	}


	/** @warning this may run into memory limits on smaller systems */


	/** export three months of posts. If you want to export and import all posts you have to start with 
	  * the first year and export/import them in ascending order. 
	  *
	  * Don't export linked resource items. we'll have to pull those out separately.
	  */

	$r = q("select * from item where item_wall = 1 and item_deleted = 0 and uid = %d and created > %s - INTERVAL %s and resource_type = '' order by created",
		intval($channel_id),
		db_utcnow(), 
		db_quoteinterval('3 MONTH')
	);
	if($r) {
		$ret['item'] = array();
		xchan_query($r);
		$r = fetch_post_tags($r,true);
		foreach($r as $rr)
			$ret['item'][] = encode_item($rr,true);
	}

	return $ret;
}


function identity_export_year($channel_id,$year,$month = 0) {

	if(! $year)
		return array();

	if($month && $month <= 12) {
		$target_month = sprintf('%02d',$month);
		$target_month_plus = sprintf('%02d',$month+1);
	}
	else
		$target_month = '01';

	$ret = array();

	$ch = channelx_by_n($channel_id);
	if($ch) {
		$ret['relocate'] = [ 'channel_address' => $ch['channel_address'], 'url' => z_root()];
	}
	$mindate = datetime_convert('UTC','UTC',$year . '-' . $target_month . '-01 00:00:00');
	if($month && $month < 12)
		$maxdate = datetime_convert('UTC','UTC',$year . '-' . $target_month_plus . '-01 00:00:00');
	else
		$maxdate = datetime_convert('UTC','UTC',$year+1 . '-01-01 00:00:00');

	$r = q("select * from item where ( item_wall = 1 or item_type != %d ) and item_deleted = 0 and uid = %d and created >= '%s' and created < '%s'  and resource_type = '' order by created",
		intval(ITEM_TYPE_POST),
		intval($channel_id),
		dbesc($mindate), 
		dbesc($maxdate)
	);

	if($r) {
		$ret['item'] = array();
		xchan_query($r);
		$r = fetch_post_tags($r,true);
		foreach($r as $rr)
			$ret['item'][] = encode_item($rr,true);
	}

	return $ret;
}

// export items within an arbitrary date range. Date/time is in UTC.

function channel_export_items($channel_id,$start,$finish) {

	if(! $start)
		return array();
	else
		$start = datetime_convert('UTC','UTC',$start);

	$finish = datetime_convert('UTC','UTC',(($finish) ? $finish : 'now'));
	if($finish < $start)
		return array();

	$ret = array();

	$ch = channelx_by_n($channel_id);
	if($ch) {
		$ret['relocate'] = [ 'channel_address' => $ch['channel_address'], 'url' => z_root()];
	}

	$r = q("select * from item where ( item_wall = 1 or item_type != %d ) and item_deleted = 0 and uid = %d and created >= '%s' and created < '%s'  and resource_type = '' order by created",
		intval(ITEM_TYPE_POST),
		intval($channel_id),
		dbesc($start), 
		dbesc($finish)
	);

	if($r) {
		$ret['item'] = array();
		xchan_query($r);
		$r = fetch_post_tags($r,true);
		foreach($r as $rr)
			$ret['item'][] = encode_item($rr,true);
	}

	return $ret;
}


/**
 * @brief Loads a profile into the App structure.
 *
 * The function requires a writeable copy of the main App structure, and the
 * nickname of a valid channel.
 *
 * Permissions of the current observer are checked. If a restricted profile is available
 * to the current observer, that will be loaded instead of the channel default profile.
 * 
 * The channel owner can set $profile to a valid profile_guid to preview that profile.
 *
 * The channel default theme is also selected for use, unless over-riden elsewhere.
 *
 * @param string $nickname
 * @param string $profile
 */
function profile_load($nickname, $profile = '') {

//	logger('profile_load: ' . $nickname . (($profile) ? ' profile: ' . $profile : ''));

	$user = q("select channel_id from channel where channel_address = '%s' and channel_removed = 0  limit 1",
		dbesc($nickname)
	);

	if(! $user) {
		logger('profile error: ' . App::$query_string, LOGGER_DEBUG);
		notice( t('Requested channel is not available.') . EOL );
		App::$error = 404;
		return;
	}

	// get the current observer
	$observer = App::get_observer();

	$can_view_profile = true;

	// Can the observer see our profile?
	require_once('include/permissions.php');
	if(! perm_is_allowed($user[0]['channel_id'],$observer['xchan_hash'],'view_profile')) {
		$can_view_profile = false;
	}

	if(! $profile) {
		$r = q("SELECT abook_profile FROM abook WHERE abook_xchan = '%s' and abook_channel = '%d' limit 1",
			dbesc($observer['xchan_hash']),
			intval($user[0]['channel_id'])
		);
		if($r)
			$profile = $r[0]['abook_profile'];
	}
	$p = null;

	if($profile) {
		$p = q("SELECT profile.uid AS profile_uid, profile.*, channel.* FROM profile
				LEFT JOIN channel ON profile.uid = channel.channel_id
				WHERE channel.channel_address = '%s' AND profile.profile_guid = '%s' LIMIT 1",
				dbesc($nickname),
				dbesc($profile)
		);
	}

	if(! $p) {
		$p = q("SELECT profile.uid AS profile_uid, profile.*, channel.* FROM profile
			LEFT JOIN channel ON profile.uid = channel.channel_id
			WHERE channel.channel_address = '%s' and channel_removed = 0
			AND profile.is_default = 1 LIMIT 1",
			dbesc($nickname)
		);
	}

	if(! $p) {
		logger('profile error: ' . App::$query_string, LOGGER_DEBUG);
		notice( t('Requested profile is not available.') . EOL );
		App::$error = 404;
		return;
	}

	$q = q("select * from profext where hash = '%s' and channel_id = %d",
		dbesc($p[0]['profile_guid']),
		intval($p[0]['profile_uid'])
	);
	if($q) {

		$extra_fields = array();

		require_once('include/channel.php');
		$profile_fields_basic    = get_profile_fields_basic();
		$profile_fields_advanced = get_profile_fields_advanced();

		$advanced = ((feature_enabled(local_channel(),'advanced_profiles')) ? true : false);
		if($advanced)
			$fields = $profile_fields_advanced;
		else
			$fields = $profile_fields_basic;

		foreach($q as $qq) {
			foreach($fields as $k => $f) {
				if($k == $qq['k']) {
					$p[0][$k] = $qq['v'];
					$extra_fields[] = $k;
					break;
				}
			}
		}
	}

	$p[0]['extra_fields'] = $extra_fields;

	$z = q("select xchan_photo_date, xchan_addr from xchan where xchan_hash = '%s' limit 1",
		dbesc($p[0]['channel_hash'])
	);
	if($z) {
		$p[0]['picdate'] = $z[0]['xchan_photo_date'];
		$p[0]['reddress'] = str_replace('@','&#x40;',$z[0]['xchan_addr']);
	}

	// fetch user tags if this isn't the default profile

	if(! $p[0]['is_default']) {
		$x = q("select `keywords` from `profile` where uid = %d and `is_default` = 1 limit 1",
				intval($p[0]['profile_uid'])
		);
		if($x && $can_view_profile)
			$p[0]['keywords'] = $x[0]['keywords'];
	}

	if($p[0]['keywords']) {
		$keywords = str_replace(array('#',',',' ',',,'),array('',' ',',',','),$p[0]['keywords']);
		if(strlen($keywords) && $can_view_profile)
			App::$page['htmlhead'] .= '<meta name="keywords" content="' . htmlentities($keywords,ENT_COMPAT,'UTF-8') . '" />' . "\r\n" ;
	}

	App::$profile = $p[0];
	App::$profile_uid = $p[0]['profile_uid'];
	App::$page['title'] = App::$profile['channel_name'] . " - " . App::$profile['channel_address'] . "@" . App::get_hostname();

	App::$profile['permission_to_view'] = $can_view_profile;

	if($can_view_profile) {
		$online = get_online_status($nickname);
		App::$profile['online_status'] = $online['result'];
	}

	if(local_channel()) {
		App::$profile['channel_mobile_theme'] = get_pconfig(local_channel(),'system', 'mobile_theme');
		$_SESSION['mobile_theme'] = App::$profile['channel_mobile_theme'];
	}

	/*
	 * load/reload current theme info
	 */

	$_SESSION['theme'] = $p[0]['channel_theme'];

}

function profile_edit_menu($uid) {

	$ret = array();

	$is_owner = (($uid == local_channel()) ? true : false);

	// show edit profile to profile owner
	if($is_owner) {
		$ret['menu'] = array(
			'chg_photo' => t('Change profile photo'),
			'entries' => array(),
		);

		$multi_profiles = feature_enabled(local_channel(), 'multi_profiles');
		if($multi_profiles) {
			$ret['multi'] = 1;
			$ret['edit'] = array(z_root(). '/profiles', t('Edit Profiles'), '', t('Edit'));
			$ret['menu']['cr_new'] = t('Create New Profile');
		}
		else {
			$ret['edit'] = array(z_root() . '/profiles/' . $uid, t('Edit Profile'), '', t('Edit'));
		}

		$r = q("SELECT * FROM profile WHERE uid = %d",
				local_channel()
		);

		if($r) {
			foreach($r as $rr) {
				if(!($multi_profiles || $rr['is_default']))
					 continue;
				$ret['menu']['entries'][] = array(
					'photo'                => $rr['thumb'],
					'id'                   => $rr['id'],
					'alt'                  => t('Profile Image'),
					'profile_name'         => $rr['profile_name'],
					'isdefault'            => $rr['is_default'],
					'visible_to_everybody' => t('Visible to everybody'),
					'edit_visibility'      => t('Edit visibility'),
				);
			}
		}
	}

	return $ret;

}

/**
 * @brief Formats a profile for display in the sidebar.
 *
 * It is very difficult to templatise the HTML completely
 * because of all the conditional logic.
 *
 * @param array $profile
 * @param int $block
 * @param boolean $show_connect
 *
 * @return HTML string suitable for sidebar inclusion
 * Exceptions: Returns empty string if passed $profile is wrong type or not populated
 */
function profile_sidebar($profile, $block = 0, $show_connect = true, $zcard = false) {

	$observer = App::get_observer();

	$o = '';
	$location = false;
	$pdesc = true;
	$reddress = true;

	if(! perm_is_allowed($profile['uid'],((is_array($observer)) ? $observer['xchan_hash'] : ''),'view_profile')) {
		$block = true;
	}

	if((! is_array($profile)) && (! count($profile)))
		return $o;

	head_set_icon($profile['thumb']);

	if(is_sys_channel($profile['uid']))
		$show_connect = false;

	$profile['picdate'] = urlencode($profile['picdate']);

	call_hooks('profile_sidebar_enter', $profile);

	if($show_connect) {

		// This will return an empty string if we're already connected.

		$connect_url = rconnect_url($profile['uid'],get_observer_hash());
		$connect = (($connect_url) ? t('Connect') : '');
		if($connect_url) 
			$connect_url = sprintf($connect_url,urlencode($profile['channel_address'] . '@' . App::get_hostname()));

		// premium channel - over-ride

		if($profile['channel_pageflags'] & PAGE_PREMIUM)
			$connect_url = z_root() . '/connect/' . $profile['channel_address'];
	}

	if((x($profile,'address') == 1)
		|| (x($profile,'locality') == 1)
		|| (x($profile,'region') == 1)
		|| (x($profile,'postal_code') == 1)
		|| (x($profile,'country_name') == 1))
		$location = t('Location:');

	$profile['homepage'] = linkify($profile['homepage'],true);

	$gender   = ((x($profile,'gender')   == 1) ? t('Gender:')   : False);
	$marital  = ((x($profile,'marital')  == 1) ? t('Status:')   : False);
	$homepage = ((x($profile,'homepage') == 1) ? t('Homepage:') : False);
	$profile['online']   = (($profile['online_status'] === 'online') ? t('Online Now') : False);

//	logger('online: ' . $profile['online']);


	if(($profile['hidewall'] && (! local_channel()) && (! remote_channel())) || $block ) {
		$location = $reddress = $pdesc = $gender = $marital = $homepage = False;
	}

	$firstname = ((strpos($profile['channel_name'],' '))
		? trim(substr($profile['channel_name'],0,strpos($profile['channel_name'],' '))) : $profile['channel_name']);
	$lastname = (($firstname === $profile['channel_name']) ? '' : trim(substr($profile['channel_name'],strlen($firstname))));

	$diaspora = array(
		'podloc'     => z_root(),
		'guid'       => $profile['channel_guid'] . str_replace('.','',App::get_hostname()),
		'searchable' => (($block) ? 'false' : 'true'),
		'nickname'   => $profile['channel_address'],
		'fullname'   => $profile['channel_name'],
		'firstname'  => $firstname,
		'lastname'   => $lastname,
		'photo300'   => z_root() . '/photo/profile/300/' . $profile['uid'] . '.jpg',
		'photo100'   => z_root() . '/photo/profile/100/' . $profile['uid'] . '.jpg',
		'photo50'    => z_root() . '/photo/profile/50/'  . $profile['uid'] . '.jpg',
	);

	$contact_block = contact_block();

	$channel_menu = false;
	$menu = get_pconfig($profile['uid'],'system','channel_menu');
	if($menu && ! $block) {
		require_once('include/menu.php');
		$m = menu_fetch($menu,$profile['uid'],$observer['xchan_hash']);
		if($m)
			$channel_menu = menu_render($m);
	}
	$menublock = get_pconfig($profile['uid'],'system','channel_menublock');
	if ($menublock && (! $block)) {
		$comanche = new Zotlabs\Render\Comanche();
		$channel_menu .= $comanche->block($menublock);
	}

	if($zcard)
		$tpl = get_markup_template('profile_vcard_short.tpl');
	else
		$tpl = get_markup_template('profile_vcard.tpl');

	require_once('include/widgets.php');

	if(! feature_enabled($profile['uid'],'hide_rating'))
		$z = widget_rating(array('target' => $profile['channel_hash']));

	$o .= replace_macros($tpl, array(
		'$zcard'         => $zcard,
		'$profile'       => $profile,
		'$connect'       => $connect,
		'$connect_url'   => $connect_url,
		'$location'      => $location,
		'$gender'        => $gender,
		'$pdesc'         => $pdesc,
		'$marital'       => $marital,
		'$homepage'      => $homepage,
		'$chanmenu'      => $channel_menu,
		'$diaspora'      => $diaspora,
		'$reddress'      => $reddress,
		'$rating'        => $z,
		'$contact_block' => $contact_block,
		'$editmenu'	 => profile_edit_menu($profile['uid'])
	));

	$arr = array('profile' => &$profile, 'entry' => &$o);

	call_hooks('profile_sidebar', $arr);

	return $o;
}


function advanced_profile(&$a) {
	require_once('include/text.php');
	if(! perm_is_allowed(App::$profile['profile_uid'],get_observer_hash(),'view_profile'))
		return '';

	if(App::$profile['fullname']) {

		$profile_fields_basic    = get_profile_fields_basic();
		$profile_fields_advanced = get_profile_fields_advanced();

		$advanced = ((feature_enabled(App::$profile['profile_uid'],'advanced_profiles')) ? true : false);
		if($advanced)
			$fields = $profile_fields_advanced;
		else
			$fields = $profile_fields_basic;

		$clean_fields = array();
		if($fields) {
			foreach($fields as $k => $v) {
				$clean_fields[] = trim($k);
			}
		}


		$tpl = get_markup_template('profile_advanced.tpl');

		$profile = array();

		$profile['fullname'] = array( t('Full Name:'), App::$profile['fullname'] ) ;

		if(App::$profile['gender']) $profile['gender'] = array( t('Gender:'),  App::$profile['gender'] );

		$ob_hash = get_observer_hash();
		if($ob_hash && perm_is_allowed(App::$profile['profile_uid'],$ob_hash,'post_like')) {
			$profile['canlike'] = true;
			$profile['likethis'] = t('Like this channel');
			$profile['profile_guid'] = App::$profile['profile_guid'];
		}

		$likers = q("select liker, xchan.*  from likes left join xchan on liker = xchan_hash where channel_id = %d and target_type = '%s' and verb = '%s'",
			intval(App::$profile['profile_uid']),
			dbesc(ACTIVITY_OBJ_PROFILE),
			dbesc(ACTIVITY_LIKE)
		);
		$profile['likers'] = array();
		$profile['like_count'] = count($likers);
		$profile['like_button_label'] = tt('Like','Likes',$profile['like_count'],'noun');
		if($likers) {
			foreach($likers as $l)
				$profile['likers'][] = array('name' => $l['xchan_name'],'photo' => zid($l['xchan_photo_s']), 'url' => zid($l['xchan_url']));
		}

		if((App::$profile['dob']) && (App::$profile['dob'] != '0000-00-00')) {

			$val = '';

			if((substr(App::$profile['dob'],5,2) === '00') || (substr(App::$profile['dob'],8,2) === '00'))
				$val = substr(App::$profile['dob'],0,4);
		
			$year_bd_format = t('j F, Y');
			$short_bd_format = t('j F');

			if(! $val) {
				$val = ((intval(App::$profile['dob'])) 
					? day_translate(datetime_convert('UTC','UTC',App::$profile['dob'] . ' 00:00 +00:00',$year_bd_format))
					: day_translate(datetime_convert('UTC','UTC','2001-' . substr(App::$profile['dob'],5) . ' 00:00 +00:00',$short_bd_format)));
			}
			$profile['birthday'] = array( t('Birthday:'), $val);
		}

		if($age = age(App::$profile['dob'],App::$profile['timezone'],''))
			$profile['age'] = array( t('Age:'), $age );

		if(App::$profile['marital'])
			$profile['marital'] = array( t('Status:'), App::$profile['marital']);

		if(App::$profile['partner'])
			$profile['marital']['partner'] = bbcode(App::$profile['partner']);

		if(strlen(App::$profile['howlong']) && App::$profile['howlong'] !== NULL_DATE) {
			$profile['howlong'] = relative_date(App::$profile['howlong'], t('for %1$d %2$s'));
		}

		if(App::$profile['sexual']) $profile['sexual'] = array( t('Sexual Preference:'), App::$profile['sexual'] );

		if(App::$profile['homepage']) $profile['homepage'] = array( t('Homepage:'), linkify(App::$profile['homepage']) );

		if(App::$profile['hometown']) $profile['hometown'] = array( t('Hometown:'), linkify(App::$profile['hometown']) );

		if(App::$profile['keywords']) $profile['keywords'] = array( t('Tags:'), App::$profile['keywords']);

		if(App::$profile['politic']) $profile['politic'] = array( t('Political Views:'), App::$profile['politic']);

		if(App::$profile['religion']) $profile['religion'] = array( t('Religion:'), App::$profile['religion']);

		if($txt = prepare_text(App::$profile['about'])) $profile['about'] = array( t('About:'), $txt );

		if($txt = prepare_text(App::$profile['interest'])) $profile['interest'] = array( t('Hobbies/Interests:'), $txt);

		if($txt = prepare_text(App::$profile['likes'])) $profile['likes'] = array( t('Likes:'), $txt);

		if($txt = prepare_text(App::$profile['dislikes'])) $profile['dislikes'] = array( t('Dislikes:'), $txt);

		if($txt = prepare_text(App::$profile['contact'])) $profile['contact'] = array( t('Contact information and Social Networks:'), $txt);

		if($txt = prepare_text(App::$profile['channels'])) $profile['channels'] = array( t('My other channels:'), $txt);

		if($txt = prepare_text(App::$profile['music'])) $profile['music'] = array( t('Musical interests:'), $txt);
		
		if($txt = prepare_text(App::$profile['book'])) $profile['book'] = array( t('Books, literature:'), $txt);

		if($txt = prepare_text(App::$profile['tv'])) $profile['tv'] = array( t('Television:'), $txt);

		if($txt = prepare_text(App::$profile['film'])) $profile['film'] = array( t('Film/dance/culture/entertainment:'), $txt);

		if($txt = prepare_text(App::$profile['romance'])) $profile['romance'] = array( t('Love/Romance:'), $txt);
		
		if($txt = prepare_text(App::$profile['employment'])) $profile['employment'] = array( t('Work/employment:'), $txt);

		if($txt = prepare_text(App::$profile['education'])) $profile['education'] = array( t('School/education:'), $txt );

		if(App::$profile['extra_fields']) {
			foreach(App::$profile['extra_fields'] as $f) {
				$x = q("select * from profdef where field_name = '%s' limit 1",
					dbesc($f)
				);
				if($x && $txt = prepare_text(App::$profile[$f]))
					$profile[$f] = array( $x[0]['field_desc'] . ':',$txt);
			}
			$profile['extra_fields'] = App::$profile['extra_fields'];
		}

		$things = get_things(App::$profile['profile_guid'],App::$profile['profile_uid']);


//		logger('mod_profile: things: ' . print_r($things,true), LOGGER_DATA); 

		return replace_macros($tpl, array(
			'$title' => t('Profile'),
			'$canlike' => (($profile['canlike'])? true : false),
			'$likethis' => t('Like this thing'),
			'$profile' => $profile,
			'$fields' => $clean_fields,
			'$editmenu' => profile_edit_menu(App::$profile['profile_uid']),
			'$things' => $things
		));
	}

	return '';
}


function get_my_url() {
	if(x($_SESSION, 'zrl_override'))
		return $_SESSION['zrl_override'];
	if(x($_SESSION, 'my_url'))
		return $_SESSION['my_url'];

	return false;
}

function get_my_address() {
	if(x($_SESSION, 'zid_override'))
		return $_SESSION['zid_override'];
	if(x($_SESSION, 'my_address'))
		return $_SESSION['my_address'];

	return false;
}

/**
 * @brief
 *
 * If somebody arrives at our site using a zid, add their xchan to our DB if we don't have it already.
 * And if they aren't already authenticated here, attempt reverse magic auth.
 *
 *
 * @hooks 'zid_init'
 *      string 'zid' - their zid
 *      string 'url' - the destination url
 */
function zid_init() {
	$tmp_str = get_my_address();
	if(validate_email($tmp_str)) {
		Zotlabs\Daemon\Master::Summon(array('Gprobe',bin2hex($tmp_str)));
		$arr = array('zid' => $tmp_str, 'url' => App::$cmd);
		call_hooks('zid_init',$arr);
		if(! local_channel()) {
			$r = q("select * from hubloc where hubloc_addr = '%s' order by hubloc_connected desc limit 1",
				dbesc($tmp_str)
			);
			if($r && remote_channel() && remote_channel() === $r[0]['hubloc_hash'])
				return;
			logger('zid_init: not authenticated. Invoking reverse magic-auth for ' . $tmp_str);
			// try to avoid recursion - but send them home to do a proper magic auth
			$query = App::$query_string;
			$query = str_replace(array('?zid=','&zid='),array('?rzid=','&rzid='),$query);
			$dest = '/' . urlencode($query);
			if($r && ($r[0]['hubloc_url'] != z_root()) && (! strstr($dest,'/magic')) && (! strstr($dest,'/rmagic'))) {
				goaway($r[0]['hubloc_url'] . '/magic' . '?f=&rev=1&dest=' . z_root() . $dest);
			}
			else
				logger('zid_init: no hubloc found.');
		}
	}
}

/**
 * @brief
 *
 * If somebody arrives at our site using a zat, authenticate them
 *
 */

function zat_init() {
	if(local_channel() || remote_channel())
		return;

	$r = q("select * from atoken where atoken_token = '%s' limit 1",
		dbesc($_REQUEST['zat'])
	);
	if($r) {
		$xchan = atoken_xchan($r[0]);
		atoken_login($xchan);
	}

}


/**
 * @brief Adds a zid parameter to a url.
 *
 * @param string $s
 *   The url to accept the zid
 * @param boolean $address
 *   $address to use instead of session environment
 * @return string
 *
 * @hooks 'zid'
 *      string url - url to accept zid
 *      string zid - urlencoded zid
 *      string result - the return string we calculated, change it if you want to return something else
 */
function zid($s,$address = '') {
	if (! strlen($s) || strpos($s,'zid='))
		return $s;

	$has_params = ((strpos($s,'?')) ? true : false);
	$num_slashes = substr_count($s, '/');
	if (! $has_params)
		$has_params = ((strpos($s, '&')) ? true : false);

	$achar = strpos($s,'?') ? '&' : '?';

	$mine = get_my_url();
	$myaddr = (($address) ? $address : get_my_address());

	/** @FIXME checking against our own channel url is no longer reliable. We may have a lot
	 * of urls attached to out channel. Should probably match against our site, since we
	 * will not need to remote authenticate on our own site anyway.
	 */

	if ($mine && $myaddr && (! link_compare($mine,$s)))
		$zurl = $s . (($num_slashes >= 3) ? '' : '/') . $achar . 'zid=' . urlencode($myaddr);
	else
		$zurl = $s;

	$arr = array('url' => $s, 'zid' => urlencode($myaddr), 'result' => $zurl);
	call_hooks('zid', $arr);

	return $arr['result'];
}

// Used from within PCSS themes to set theme parameters. If there's a
// puid request variable, that is the "page owner" and normally their theme
// settings take precedence; unless a local user sets the "always_my_theme" 
// system pconfig, which means they don't want to see anybody else's theme 
// settings except their own while on this site.

function get_theme_uid() {
	$uid = (($_REQUEST['puid']) ? intval($_REQUEST['puid']) : 0);
	if(local_channel()) {
		if((get_pconfig(local_channel(),'system','always_my_theme')) || (! $uid))
			return local_channel();
	}
	if(! $uid) {
		$x = get_sys_channel();
		if($x)
			return $x['channel_id'];
	}

	return $uid;
}

/**
* @brief Retrieves the path of the default_profile_photo for this system
* with the specified size.
*
* @param int $size
*  one of (300, 80, 48)
* @returns string
*/
function get_default_profile_photo($size = 300) {
	$scheme = get_config('system','default_profile_photo');
	if(! $scheme)
		$scheme = 'rainbow_man';

	return 'images/default_profile_photos/' . $scheme . '/' . $size . '.png';
}

/**
 * @brief Test whether a given identity is NOT a member of the Hubzilla.
 *
 * @param string $s;
 *    xchan_hash of the identity in question
 * @returns boolean true or false
 */
function is_foreigner($s) {
	return((strpbrk($s, '.:@')) ? true : false);
}

/**
 * @brief Test whether a given identity is a member of the Hubzilla.
 *
 * @param string $s;
 *    xchan_hash of the identity in question
 * @returns boolean true or false
 */
function is_member($s) {
	return((is_foreigner($s)) ? false : true);
}

function get_online_status($nick) {

	$ret = array('result' => false);

	if(observer_prohibited())
		return $ret;

	$r = q("select channel_id, channel_hash from channel where channel_address = '%s' limit 1",
		dbesc(argv(1))
	);
	if($r) {
		$hide = get_pconfig($r[0]['channel_id'],'system','hide_online_status');
		if($hide)
			return $ret;
		$x = q("select cp_status from chatpresence where cp_xchan = '%s' and cp_room = 0 limit 1",
			dbesc($r[0]['channel_hash'])
		);
		if($x)
			$ret['result'] = $x[0]['cp_status'];
	}

	return $ret;
}


function remote_online_status($webbie) {

	$result = false;
	$r = q("select * from hubloc where hubloc_addr = '%s' limit 1",
		dbesc($webbie)
	);
	if(! $r)
		return $result;

	$url = $r[0]['hubloc_url'] . '/online/' . substr($webbie,0,strpos($webbie,'@'));

	$x = z_fetch_url($url);
	if($x['success']) {
		$j = json_decode($x['body'],true);
		if($j)
			$result = (($j['result']) ? $j['result'] : false);
	}

	return $result;
}


function get_channel_by_nick($nick) {
	$r = q("select * from channel where channel_address = '%s' limit 1",
		dbesc($nick)
	);
	return(($r) ? $r[0] : false);

}

/**
 * @brief
 *
 * @return string
 */
function identity_selector() {
	if (local_channel()) {
		$r = q("select channel.*, xchan.* from channel left join xchan on channel.channel_hash = xchan.xchan_hash where channel.channel_account_id = %d and channel_removed = 0 order by channel_name ",
			intval(get_account_id())
		);
		if (count($r) > 1) {
			//$account = App::get_account();
			$o = replace_macros(get_markup_template('channel_id_select.tpl'), array(
				'$channels' => $r,
				'$selected' => local_channel()
			));
			return $o;
		}
	}

	return '';
}


function is_public_profile() {
	if(! local_channel())
		return false;
	if(intval(get_config('system','block_public')))
		return false;
	$channel = App::get_channel();
	if($channel) {
		$perm = \Zotlabs\Access\PermissionLimits::Get($channel['channel_id'],'view_profile');
		if($perm == PERMS_PUBLIC)
			return true;
	}
	return false;
}

function get_profile_fields_basic($filter = 0) {

	$profile_fields_basic = (($filter == 0) ? get_config('system','profile_fields_basic') : null);
	if(! $profile_fields_basic)
		$profile_fields_basic = array('fullname','pdesc','chandesc','gender','dob','dob_tz','address','locality','region','postal_code','country_name','marital','sexual','homepage','hometown','keywords','about','contact');

	$x = array();
	if($profile_fields_basic)
		foreach($profile_fields_basic as $f)
			$x[$f] = 1;

	return $x;
}


function get_profile_fields_advanced($filter = 0) {
	$basic = get_profile_fields_basic($filter);
	$profile_fields_advanced = (($filter == 0) ? get_config('system','profile_fields_advanced') : null);
	if(! $profile_fields_advanced)
		$profile_fields_advanced = array('partner','howlong','politic','religion','likes','dislikes','interest','channels','music','book','film','tv','romance','employment','education');

	$x = array();
	if($basic)
		foreach($basic as $f => $v)
			$x[$f] = $v;

	if($profile_fields_advanced)
		foreach($profile_fields_advanced as $f)
			$x[$f] = 1;

	return $x;
}

/**
 * @brief Clear notifyflags for a channel.
 *
 * Most likely during bulk import of content or other activity that is likely
 * to generate huge amounts of undesired notifications.
 *
 * @param int $channel_id
 *    The channel to disable notifications for
 * @returns int
 *    Current notification flag value. Send this to notifications_on() to restore the channel settings when finished
 *    with the activity requiring notifications_off(); 
 */
function notifications_off($channel_id) {
	$r = q("select channel_notifyflags from channel where channel_id = %d limit 1",
		intval($channel_id)
	);
	q("update channel set channel_notifyflags = 0 where channel_id = %d",
		intval($channel_id)
	);

	return intval($r[0]['channel_notifyflags']);
}


function notifications_on($channel_id,$value) {
	$x = q("update channel set channel_notifyflags = %d where channel_id = %d",
		intval($value),
		intval($channel_id)
	);
	return $x;
}


function get_channel_default_perms($uid) {

	$r = q("select abook_xchan from abook where abook_channel = %d and abook_self = 1 limit 1",
		intval($uid)
	);
	if($r)
		return load_abconfig($uid,$r[0]['abook_xchan'],'my_perms');

	return array();
}


function profiles_build_sync($channel_id) {
	
	$r = q("select * from profile where uid = %d",
		intval($channel_id)
	);
	if($r) {
		build_sync_packet($channel_id,array('profile' => $r));
	}
}


function auto_channel_create($account_id) {

	if(! $account_id)
		return false;

	$arr = array();
	$arr['account_id'] = $account_id;
	$arr['name'] = get_aconfig($account_id,'register','channel_name');
	$arr['nickname'] = legal_webbie(get_aconfig($account_id,'register','channel_address'));
	$arr['permissions_role'] = get_aconfig($account_id,'register','permissions_role');

	del_aconfig($account_id,'register','channel_name');
	del_aconfig($account_id,'register','channel_address');
	del_aconfig($account_id,'register','permissions_role');

	if((! $arr['name']) || (! $arr['nickname'])) {
		$x = q("select * from account where account_id = %d limit 1",
			intval($account_id)
		);
		if($x) {
			if(! $arr['name'])
				$arr['name'] = substr($x[0]['account_email'],0,strpos($x[0]['account_email'],'@'));
			if(! $arr['nickname'])
				$arr['nickname'] = legal_webbie(substr($x[0]['account_email'],0,strpos($x[0]['account_email'],'@')));
		}
	}
	if(! $arr['permissions_role'])
		$arr['permissions_role'] = 'social';

	if(validate_channelname($arr['name']))
		return false;
	if($arr['nickname'] === 'sys')
		$arr['nickname'] = $arr['nickname'] . mt_rand(1000,9999);

	$arr['nickname'] = check_webbie(array($arr['nickname'], $arr['nickname'] . mt_rand(1000,9999)));

	return create_identity($arr);

}

function get_cover_photo($channel_id,$format = 'bbcode', $res = PHOTO_RES_COVER_1200) {

	$r = q("select height, width, resource_id, mimetype from photo where uid = %d and imgscale = %d and photo_usage = %d",
		intval($channel_id),
		intval($res),
		intval(PHOTO_COVER)
	);
	if(! $r)
		return false;

	$output = false;

	$url = z_root() . '/photo/' . $r[0]['resource_id'] . '-' . $res ;

	switch($format) {
		case 'bbcode':
			$output = '[zrl=' . $r[0]['width'] . 'x' . $r[0]['height'] . ']' . $url . '[/zrl]';
			break;
		case 'html':
 			$output = '<img class="zrl" width="' . $r[0]['width'] . '" height="' . $r[0]['height'] . '" src="' . $url . '" alt="' . t('cover photo') . '" />';
			break;
		case 'array':
		default:
			$output = array(
				'width' => $r[0]['width'],
				'height' => $r[0]['height'],
				'type' => $r[0]['mimetype'],
				'url' => $url
			);
			break;
	}

	return $output;  
		
}

function get_zcard($channel,$observer_hash = '',$args = array()) {

	logger('get_zcard');

	$maxwidth = (($args['width']) ? intval($args['width']) : 0);
	$maxheight = (($args['height']) ? intval($args['height']) : 0);


	if(($maxwidth > 1200) || ($maxwidth < 1))
		$maxwidth = 1200;

	if($maxwidth <= 425) {
		$width = 425;
		$size = 'hz_small';
		$cover_size = PHOTO_RES_COVER_425;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 80 , 'height' => 80, 'href' => $channel['xchan_photo_m']);
	}
	elseif($maxwidth <= 900) {
		$width = 900;
		$size = 'hz_medium';
		$cover_size = PHOTO_RES_COVER_850;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 160 , 'height' => 160, 'href' => $channel['xchan_photo_l']);
	}
	elseif($maxwidth <= 1200) {
		$width = 1200;
		$size = 'hz_large';
		$cover_size = PHOTO_RES_COVER_1200;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 300 , 'height' => 300, 'href' => $channel['xchan_photo_l']);
	}

//	$scale = (float) $maxwidth / $width;
//	$translate = intval(($scale / 1.0) * 100);


	$channel['channel_addr'] = $channel['channel_address'] . '@' . App::get_hostname();
	$zcard = array('chan' => $channel);

	$r = q("select height, width, resource_id, imgscale, mimetype from photo where uid = %d and imgscale = %d and photo_usage = %d",
		intval($channel['channel_id']),
		intval($cover_size),
		intval(PHOTO_COVER)
	);

	if($r) {
		$cover = $r[0];
		$cover['href'] = z_root() . '/photo/' . $r[0]['resource_id'] . '-' . $r[0]['imgscale'];
	}		
	else {
		$cover = $pphoto;
	}
	
	$o .= replace_macros(get_markup_template('zcard.tpl'),array(
		'$maxwidth' => $maxwidth,
		'$scale' => $scale,
		'$translate' => $translate,
		'$size' => $size,
		'$cover' => $cover,
		'$pphoto' => $pphoto,
		'$zcard' => $zcard
	));		
	
	return $o;
		
}


function get_zcard_embed($channel,$observer_hash = '',$args = array()) {

	logger('get_zcard_embed');

	$maxwidth = (($args['width']) ? intval($args['width']) : 0);
	$maxheight = (($args['height']) ? intval($args['height']) : 0);


	if(($maxwidth > 1200) || ($maxwidth < 1))
		$maxwidth = 1200;

	if($maxwidth <= 425) {
		$width = 425;
		$size = 'hz_small';
		$cover_size = PHOTO_RES_COVER_425;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 80 , 'height' => 80, 'href' => $channel['xchan_photo_m']);
	}
	elseif($maxwidth <= 900) {
		$width = 900;
		$size = 'hz_medium';
		$cover_size = PHOTO_RES_COVER_850;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 160 , 'height' => 160, 'href' => $channel['xchan_photo_l']);
	}
	elseif($maxwidth <= 1200) {
		$width = 1200;
		$size = 'hz_large';
		$cover_size = PHOTO_RES_COVER_1200;
		$pphoto = array('mimetype' => $channel['xchan_photo_mimetype'],  'width' => 300 , 'height' => 300, 'href' => $channel['xchan_photo_l']);
	}

	$channel['channel_addr'] = $channel['channel_address'] . '@' . App::get_hostname();
	$zcard = array('chan' => $channel);

	$r = q("select height, width, resource_id, imgscale, mimetype from photo where uid = %d and imgscale = %d and photo_usage = %d",
		intval($channel['channel_id']),
		intval($cover_size),
		intval(PHOTO_COVER)
	);

	if($r) {
		$cover = $r[0];
		$cover['href'] = z_root() . '/photo/' . $r[0]['resource_id'] . '-' . $r[0]['imgscale'];
	}		
	else {
		$cover = $pphoto;
	}
	
	$o .= replace_macros(get_markup_template('zcard_embed.tpl'),array(
		'$maxwidth' => $maxwidth,
		'$scale' => $scale,
		'$translate' => $translate,
		'$size' => $size,
		'$cover' => $cover,
		'$pphoto' => $pphoto,
		'$zcard' => $zcard
	));		
	
	return $o;
		
}


function channelx_by_nick($nick) {
	$r = q("SELECT * FROM channel left join xchan on channel_hash = xchan_hash WHERE channel_address = '%s'  and channel_removed = 0 LIMIT 1",
		dbesc($nick)
	);
	return(($r) ? $r[0] : false);
}

function channelx_by_hash($hash) {
	$r = q("SELECT * FROM channel left join xchan on channel_hash = xchan_hash WHERE channel_hash = '%s'  and channel_removed = 0 LIMIT 1",
		dbesc($hash)
	);
	return(($r) ? $r[0] : false);
}

function channelx_by_n($id) {
	$r = q("SELECT * FROM channel left join xchan on channel_hash = xchan_hash WHERE channel_id = %d  and channel_removed = 0 LIMIT 1",
		dbesc($id)
	);
	return(($r) ? $r[0] : false);
}