<?php
namespace Zotlabs\Lib;

use Zotlabs\Lib\Libsync;

/**
 * @brief A class with chatroom related static methods.
 */
class Chatroom {
	/**
	 * @brief Creates a chatroom.
	 *
	 * @param array $channel
	 * @param array $arr
	 * @return array An associative array containing:
	 *   * \e boolean \b success - A boolean success status
	 *   * \e string \b message - (optional) A string
	 */
	static public function create($channel, $arr) {

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

		$name = trim($arr['name']);
		if(! $name) {
			$ret['message'] = t('Missing room name');
			return $ret;
		}

		$r = q("select cr_id from chatroom where cr_uid = %d and cr_name = '%s' limit 1",
			intval($channel['channel_id']),
			dbesc($name)
		);
		if($r) {
			$ret['message'] = t('Duplicate room name');
			return $ret;
		}

		$r = q("select count(cr_id) as total from chatroom where cr_aid = %d",
			intval($channel['channel_account_id'])
		);
		if($r)
			$limit = service_class_fetch($channel['channel_id'], 'chatrooms');

		if(($r) && ($limit !== false) && ($r[0]['total'] >= $limit)) {
			$ret['message'] = upgrade_message();
			return $ret;
		}

		if(! array_key_exists('expire', $arr))
			$arr['expire'] = 120;  // minutes, e.g. 2 hours

		$created = datetime_convert();

		$x = q("insert into chatroom ( cr_aid, cr_uid, cr_name, cr_created, cr_edited, cr_expire, allow_cid, allow_gid, deny_cid, deny_gid )
			values ( %d, %d , '%s', '%s', '%s', %d, '%s', '%s', '%s', '%s' ) ",
			intval($channel['channel_account_id']),
			intval($channel['channel_id']),
			dbesc($name),
			dbesc($created),
			dbesc($created),
			intval($arr['expire']),
			dbesc($arr['allow_cid']),
			dbesc($arr['allow_gid']),
			dbesc($arr['deny_cid']),
			dbesc($arr['deny_gid'])
		);

		if($x)
			$ret['success'] = true;

		return $ret;
	}


	static public function destroy($channel,$arr) {

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

		if(intval($arr['cr_id']))
			$sql_extra = " and cr_id = " . intval($arr['cr_id']) . " ";
		elseif(trim($arr['cr_name']))
			$sql_extra = " and cr_name = '" . protect_sprintf(dbesc(trim($arr['cr_name']))) . "' ";
		else {
			$ret['message'] = t('Invalid room specifier.');
			return $ret;
		}

		$r = q("select * from chatroom where cr_uid = %d $sql_extra limit 1",
			intval($channel['channel_id'])
		);
		if(! $r) {
			$ret['message'] = t('Invalid room specifier.');
			return $ret;
		}

		Libsync::build_sync_packet($channel['channel_id'],array('chatroom' => $r));

		q("delete from chatroom where cr_id = %d",
			intval($r[0]['cr_id'])
		);
		if($r[0]['cr_id']) {
			q("delete from chatpresence where cp_room = %d",
				intval($r[0]['cr_id'])
			);
			q("delete from chat where chat_room = %d",
				intval($r[0]['cr_id'])
			);
		}

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


	static public function enter($observer_xchan, $room_id, $status, $client) {

		if(! $room_id || ! $observer_xchan)
			return;

		$r = q("select * from chatroom where cr_id = %d limit 1",
			intval($room_id)
		);
		if(! $r) {
			notice( t('Room not found.') . EOL);
			return false;
		}
		require_once('include/security.php');
		$sql_extra = permissions_sql($r[0]['cr_uid']);

		$x = q("select * from chatroom where cr_id = %d and cr_uid = %d $sql_extra limit 1",
			intval($room_id),
			intval($r[0]['cr_uid'])
		);
		if(! $x) {
			notice( t('Permission denied.') . EOL);
			return false;
		}

		$limit = service_class_fetch($r[0]['cr_uid'], 'chatters_inroom');
		if($limit !== false) {
			$y = q("select count(*) as total from chatpresence where cp_room = %d",
				intval($room_id)
			);
			if($y && $y[0]['total'] > $limit) {
				notice( t('Room is full') . EOL);
				return false;
			}
		}

		if(intval($x[0]['cr_expire'])) {
			$r = q("delete from chat where created < %s - INTERVAL %s and chat_room = %d",
				db_utcnow(),
				db_quoteinterval( intval($x[0]['cr_expire']) . ' MINUTE' ),
				intval($x[0]['cr_id'])
			);
		}

		$r = q("select * from chatpresence where cp_xchan = '%s' and cp_room = %d limit 1",
			dbesc($observer_xchan),
			intval($room_id)
		);
		if($r) {
			q("update chatpresence set cp_last = '%s' where cp_id = %d and cp_client = '%s'",
				dbesc(datetime_convert()),
				intval($r[0]['cp_id']),
				dbesc($client)
			);
			return true;
		}

		$r = q("insert into chatpresence ( cp_room, cp_xchan, cp_last, cp_status, cp_client )
			values ( %d, '%s', '%s', '%s', '%s' )",
			intval($room_id),
			dbesc($observer_xchan),
			dbesc(datetime_convert()),
			dbesc($status),
			dbesc($client)
		);

		return $r;
	}


	public static function leave($observer_xchan, $room_id, $client) {
		if(! $room_id || ! $observer_xchan)
			return;

		$r = q("select * from chatpresence where cp_xchan = '%s' and cp_room = %d and cp_client = '%s' limit 1",
			dbesc($observer_xchan),
			intval($room_id),
			dbesc($client)
		);
		if($r) {
			q("delete from chatpresence where cp_id = %d",
				intval($r[0]['cp_id'])
			);
		}

		return true;
	}


	static public function roomlist($uid) {
		require_once('include/security.php');
		$sql_extra = permissions_sql($uid);

		$r = q("select allow_cid, allow_gid, deny_cid, deny_gid, cr_name, cr_expire, cr_id, count(cp_id) as cr_inroom from chatroom left join chatpresence on cr_id = cp_room where cr_uid = %d $sql_extra group by cr_name, cr_id order by cr_name",
			intval($uid)
		);

		return $r;
	}

	static public function list_count($uid) {
		require_once('include/security.php');
		$sql_extra = permissions_sql($uid);

		$r = q("select count(*) as total from chatroom where cr_uid = %d $sql_extra",
			intval($uid)
		);

		return $r[0]['total'];
	}

	/**
	 * @brief Create a chat message via API.
	 *
	 * It is the caller's responsibility to enter the room.
	 *
	 * @param int $uid
	 * @param int $room_id
	 * @param string $xchan
	 * @param string $text
	 * @return array
	 */
	static public function message($uid, $room_id, $xchan, $text) {

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

		if(! $text)
			return;

		$sql_extra = permissions_sql($uid);

		$r = q("select * from chatroom where cr_uid = %d and cr_id = %d $sql_extra",
			intval($uid),
			intval($room_id)
		);
		if(! $r)
			return $ret;

		$arr = [
			'chat_room' => $room_id,
			'chat_xchan' => $xchan,
			'chat_text' => $text
		];
		/**
		 * @hooks chat_message
		 *   Called to create a chat message.
		 *   * \e int \b chat_room
		 *   * \e string \b chat_xchan
		 *   * \e string \b chat_text
		 */
		call_hooks('chat_message', $arr);

		$x = q("insert into chat ( chat_room, chat_xchan, created, chat_text )
			values( %d, '%s', '%s', '%s' )",
			intval($room_id),
			dbesc($xchan),
			dbesc(datetime_convert()),
			dbesc(str_rot47(base64url_encode($arr['chat_text'])))
		);

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