<?php
/* Copyright (C) NAVER <http://www.navercorp.com> */

/**
 * Mobile class
 *
 * @author NAVER (developers@xpressengine.com)
 */
class Mobile
{

	/**
	 * Whether mobile or not mobile mode
	 * @var bool
	 */
	var $ismobile = NULL;

	/**
	 * Get instance of Mobile class(for singleton)
	 *
	 * @return Mobile
	 */
	function &getInstance()
	{
		static $theInstance;
		if(!isset($theInstance))
		{
			$theInstance = new Mobile();
		}
		return $theInstance;
	}

	/**
	 * Get current mobile mode
	 *
	 * @return bool If mobile mode returns true or false
	 */
	function isFromMobilePhone()
	{
		$oMobile = & Mobile::getInstance();
		return $oMobile->_isFromMobilePhone();
	}

	/**
	 * Get current mobile mode
	 *
	 * @return bool
	 */
	function _isFromMobilePhone()
	{
		if($this->ismobile !== NULL)
		{
			return $this->ismobile;
		}
		if(Mobile::isMobileEnabled() === false || Context::get('full_browse') || $_COOKIE["FullBrowse"])
		{
			return ($this->ismobile = false);
		}

		$xe_web_path = Context::pathToUrl(_XE_PATH_);

		// default setting. if there is cookie for a device, XE do not have to check if it is mobile or not and it will enhance performace of the server.
		$this->ismobile = FALSE;

		$m = Context::get('m');
		if(strlen($m) == 1)
		{
			if($m == "1")
			{
				$this->ismobile = TRUE;
			}
			elseif($m == "0")
			{
				$this->ismobile = FALSE;
			}
		}
		elseif(isset($_COOKIE['mobile']))
		{
			if($_COOKIE['user-agent'] == md5($_SERVER['HTTP_USER_AGENT']))
			{
				if($_COOKIE['mobile'] == 'true')
				{
					$this->ismobile = TRUE;
				}
				else
				{
					$this->ismobile = FALSE;
				}
			}
			else
			{
				$this->ismobile = FALSE;
				setcookie("mobile", FALSE, 0, $xe_web_path);
				setcookie("user-agent", FALSE, 0, $xe_web_path);
				if(!$this->isMobilePadCheckByAgent() && $this->isMobileCheckByAgent())
				{
					$this->ismobile = TRUE;
				}
			}
		}
		else
		{
			if($this->isMobilePadCheckByAgent())
			{
				$this->ismobile = FALSE;
			}
			else
			{
				if($this->isMobileCheckByAgent())
				{
					$this->ismobile = TRUE;
				}
			}
		}

		if($this->ismobile !== NULL)
		{
			if($this->ismobile == TRUE)
			{
				if($_COOKIE['mobile'] != 'true')
				{
					$_COOKIE['mobile'] = 'true';
					setcookie("mobile", 'true', 0, $xe_web_path);
				}
			}
			elseif($_COOKIE['mobile'] != 'false')
			{
				$_COOKIE['mobile'] = 'false';
				setcookie("mobile", 'false', 0, $xe_web_path);
			}

			if($_COOKIE['user-agent'] != md5($_SERVER['HTTP_USER_AGENT']))
			{
				setcookie("user-agent", md5($_SERVER['HTTP_USER_AGENT']), 0, $xe_web_path);
			}
		}

		return $this->ismobile;
	}

	/**
	 * Detect mobile device by user agent
	 *
	 * @return bool Returns true on mobile device or false.
	 */
	function isMobileCheckByAgent()
	{
		static $UACheck;
		if(isset($UACheck))
		{
			return $UACheck;
		}

		$oMobile = Mobile::getInstance();
		$mobileAgent = array('iPod', 'iPhone', 'Android', 'BlackBerry', 'SymbianOS', 'Bada', 'Tizen', 'Kindle', 'Wii', 'SCH-', 'SPH-', 'CANU-', 'Windows Phone', 'Windows CE', 'POLARIS', 'Palm', 'Dorothy Browser', 'Mobile', 'Opera Mobi', 'Opera Mini', 'Minimo', 'AvantGo', 'NetFront', 'Nokia', 'LGPlayer', 'SonyEricsson', 'HTC');

		if($oMobile->isMobilePadCheckByAgent())
		{
			$UACheck = TRUE;
			return TRUE;
		}

		foreach($mobileAgent as $agent)
		{
			if(stripos($_SERVER['HTTP_USER_AGENT'], $agent) !== FALSE)
			{
				$UACheck = TRUE;
				return TRUE;
			}
		}
		$UACheck = FALSE;
		return FALSE;
	}

	/**
	 * Check if user-agent is a tablet PC as iPad or Andoid tablet.
	 *
	 * @return bool TRUE for tablet, and FALSE for else.
	 */
	function isMobilePadCheckByAgent()
	{
		static $UACheck;
		if(isset($UACheck))
		{
			return $UACheck;
		}
		$padAgent = array('iPad', 'Android', 'webOS', 'hp-tablet', 'PlayBook');

		// Android with 'Mobile' string is not a tablet-like device, and 'Andoroid' without 'Mobile' string is a tablet-like device.
		// $exceptionAgent[0] contains exception agents for all exceptions.
		$exceptionAgent = array(0 => array('Opera Mini', 'Opera Mobi'), 'Android' => 'Mobile');

		foreach($padAgent as $agent)
		{
			if(strpos($_SERVER['HTTP_USER_AGENT'], $agent) !== FALSE)
			{
				if(!isset($exceptionAgent[$agent]))
				{
					$UACheck = TRUE;
					return TRUE;
				}
				elseif(strpos($_SERVER['HTTP_USER_AGENT'], $exceptionAgent[$agent]) === FALSE)
				{
					// If the agent is the Android, that can be either tablet and mobile phone.
					foreach($exceptionAgent[0] as $val)
					{
						if(strpos($_SERVER['HTTP_USER_AGENT'], $val) !== FALSE)
						{
							$UACheck = FALSE;
							return FALSE;
						}
					}
					$UACheck = TRUE;
					return TRUE;
				}
			}
		}

		$UACheck = FALSE;
		return FALSE;
	}

	/**
	 * Set mobile mode
	 *
	 * @param bool $ismobile
	 * @return void
	 */
	function setMobile($ismobile)
	{
		$oMobile = Mobile::getInstance();
		$oMobile->ismobile = $ismobile;
	}

	function isMobileEnabled()
	{
		$db_info = Context::getDBInfo();
		return ($db_info->use_mobile_view === 'Y');
	}
}
?>