<?php
/**
 * TUrlMapping, TUrlMappingPattern and TUrlMappingPatternSecureConnection class file.
 *
 * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web
 */

namespace Prado\Web;
use Prado\Collections\TAttributeCollection;
use Prado\Exceptions\TConfigurationException;
use Prado\Exceptions\TInvalidDataValueException;
use Prado\TPropertyValue;

/**
 * TUrlMappingPattern class.
 *
 * TUrlMappingPattern represents a pattern used to parse and construct URLs.
 * If the currently requested URL matches the pattern, it will alter
 * the THttpRequest parameters. If a constructUrl() call matches the pattern
 * parameters, the pattern will generate a valid URL. In both case, only the PATH_INFO
 * part of a URL is parsed/constructed using the pattern.
 *
 * To specify the pattern, set the {@link setPattern Pattern} property.
 * {@link setPattern Pattern} takes a string expression with
 * parameter names enclosed between a left brace '{' and a right brace '}'.
 * The patterns for each parameter can be set using {@link getParameters Parameters}
 * attribute collection. For example
 * <code>
 * <url ... pattern="articles/{year}/{month}/{day}"
 *          parameters.year="\d{4}" parameters.month="\d{2}" parameters.day="\d+" />
 * </code>
 *
 * In the above example, the pattern contains 3 parameters named "year",
 * "month" and "day". The pattern for these parameters are, respectively,
 * "\d{4}" (4 digits), "\d{2}" (2 digits) and "\d+" (1 or more digits).
 * Essentially, the <tt>Parameters</tt> attribute name and values are used
 * as substrings in replacing the placeholders in the <tt>Pattern</tt> string
 * to form a complete regular expression string.
 *
 * For more complicated patterns, one may specify the pattern using a regular expression
 * by {@link setRegularExpression RegularExpression}. For example, the above pattern
 * is equivalent to the following regular expression-based pattern:
 * <code>
 * #^articles/(?P<year>\d{4})/(?P<month>\d{2})\/(?P<day>\d+)$#u
 * </code>
 * The above regular expression used the "named group" feature available in PHP.
 * If you intended to use the <tt>RegularExpression</tt> property or
 * regular expressions in CDATA sections, notice that you need to escape the slash,
 * if you are using the slash as regular expressions delimiter.
 *
 * Thus, only an url that matches the pattern will be valid. For example,
 * a URL <tt>http://example.com/index.php/articles/2006/07/21</tt> will match the above pattern,
 * while <tt>http://example.com/index.php/articles/2006/07/hello</tt> will not
 * since the "day" parameter pattern is not satisfied.
 *
 * The parameter values are available through the <tt>THttpRequest</tt> instance (e.g.
 * <tt>$this->Request['year']</tt>).
 *
 * The {@link setServiceParameter ServiceParameter} and {@link setServiceID ServiceID}
 * (the default ID is 'page') set the service parameter and service id respectively.
 *
 * Since 3.1.4 you can also use simplyfied wildcard patterns to match multiple
 * ServiceParameters with a single rule. The pattern must contain the placeholder
 * {*} for the ServiceParameter. For example
 *
 * <url ServiceParameter="adminpages.*" pattern="admin/{*}" />
 *
 * This rule will match an URL like <tt>http://example.com/index.php/admin/edituser</tt>
 * and resolve it to the page Application.pages.admin.edituser. The wildcard matching
 * is non-recursive. That means you have to add a rule for every subdirectory you
 * want to access pages in:
 *
 * <url ServiceParameter="adminpages.users.*" pattern="useradmin/{*}" />
 *
 * It is still possible to define an explicit rule for a page in the wildcard path.
 * This rule has to preceed the wildcard rule.
 *
 * You can also use parameters with wildcard patterns. The parameters are then
 * available with every matching page:
 *
 * <url ServiceParameter="adminpages.*" pattern="admin/{*}/{id}" parameters.id="\d+" />
 *
 * To enable automatic parameter encoding in a path format from wildcard patterns you can set
 * {@setUrlFormat UrlFormat} to 'Path':
 *
 * <url ServiceParameter="adminpages.*" pattern="admin/{*}" UrlFormat="Path" />
 *
 * This will create and parse URLs of the form
 * <tt>.../index.php/admin/listuser/param1/value1/param2/value2</tt>.
 *
 * Use {@setUrlParamSeparator} to define another separator character between parameter
 * name and value. Parameter/value pairs are always separated by a '/'.
 *
 * <url ServiceParameter="adminpages.*" pattern="admin/{*}" UrlFormat="Path" UrlParamSeparator="-" />
 *
 * <tt>.../index.php/admin/listuser/param1-value1/param2-value2</tt>.
 *
 * Since 3.2.2 you can also add a list of "constants" parameters that can be used just
 * like the original "parameters" parameters, except that the supplied value will be treated
 * as a simple string constant instead of a regular expression. For example
 *
 * <url ServiceParameter="MyPage" pattern="/mypage/mypath/list/detail/{pageidx}" parameters.pageidx="\d+" constants.listtype="detailed"/>
 * <url ServiceParameter="MyPage" pattern="/mypage/mypath/list/summary/{pageidx}" parameters.pageidx="\d+" constants.listtype="summarized"/>
 *
 * These rules, when matched by the actual request, will make the application see a "lisstype" parameter present
 * (even through not supplied in the request) and equal to "detailed" or "summarized", depending on the friendly url matched.
 * The constants is practically a table-based validation and translation of specified, fixed-set parameter values.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @package Prado\Web
 * @since 3.0.5
 */
class TUrlMappingPattern extends \Prado\TComponent
{
	/**
	 * @var string service parameter such as Page class name.
	 */
	private $_serviceParameter;
	/**
	 * @var string service ID, default is 'page'.
	 */
	private $_serviceID='page';
	/**
	 * @var string url pattern to match.
	 */
	private $_pattern;
	/**
	 * @var TAttributeCollection parameter regular expressions.
	 */
	private $_parameters;
	/**
	 * @var TAttributeCollection of constant parameters.
	 */
	protected $_constants;
	/**
	 * @var string regular expression pattern.
	 */
	private $_regexp='';

	private $_customUrl=true;

	private $_manager;

	private $_caseSensitive=true;

	private $_isWildCardPattern=false;

	private $_urlFormat=THttpRequestUrlFormat::Get;

	private $_separator='/';

	/**
	 * @var TUrlMappingPatternSecureConnection
	 * @since 3.2
	 */
	private $_secureConnection = TUrlMappingPatternSecureConnection::Automatic;

	/**
	 * Constructor.
	 * @param TUrlManager the URL manager instance
	 */
	public function __construct(TUrlManager $manager)
	{
		$this->_manager=$manager;
	}

	/**
	 * @return TUrlManager the URL manager instance
	 */
	public function getManager()
	{
		return $this->_manager;
	}

	/**
	 * Initializes the pattern.
	 * @param TXmlElement configuration for this module.
	 * @throws TConfigurationException if service parameter is not specified
	 */
	public function init($config)
	{
		if($this->_serviceParameter===null)
			throw new TConfigurationException('urlmappingpattern_serviceparameter_required', $this->getPattern());
		if(strpos($this->_serviceParameter,'*')!==false)
				$this->_isWildCardPattern=true;
	}

	/**
	 * Substitute the parameter key value pairs as named groupings
	 * in the regular expression matching pattern.
	 * @return string regular expression pattern with parameter subsitution
	 */
	protected function getParameterizedPattern()
	{
		$params=array();
		$values=array();
		if ($this->_parameters)
		{
			foreach($this->_parameters as $key=>$value)
			{
				$params[]='{'.$key.'}';
				$values[]='(?P<'.$key.'>'.$value.')';
			}
		}
		if ($this->getIsWildCardPattern())
		{
				$params[]='{*}';
				// service parameter must not contain '=' and '/'
				$values[]='(?P<'.$this->getServiceID().'>[^=/]+)';
		}
		$params[]='/';
		$values[]='\\/';
		$regexp=str_replace($params,$values,trim($this->getPattern(),'/').'/');
		if ($this->_urlFormat===THttpRequestUrlFormat::Get)
				$regexp='/^'.$regexp.'$/u';
		else
				$regexp='/^'.$regexp.'(?P<urlparams>.*)$/u';

		if(!$this->getCaseSensitive())
			$regexp.='i';
		return $regexp;
	}

	/**
	 * @return string full regular expression mapping pattern
	 */
	public function getRegularExpression()
	{
		return $this->_regexp;
	}

	/**
	 * @param string full regular expression mapping pattern.
	 */
	public function setRegularExpression($value)
	{
		$this->_regexp=$value;
	}

	/**
	 * @return boolean whether the {@link getPattern Pattern} should be treated as case sensititve. Defaults to true.
	 */
	public function getCaseSensitive()
	{
		return $this->_caseSensitive;
	}

	/**
	 * @param boolean whether the {@link getPattern Pattern} should be treated as case sensititve.
	 */
	public function setCaseSensitive($value)
	{
		$this->_caseSensitive=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * @param string service parameter, such as page class name.
	 */
	public function setServiceParameter($value)
	{
		$this->_serviceParameter=$value;
	}

	/**
	 * @return string service parameter, such as page class name.
	 */
	public function getServiceParameter()
	{
		return $this->_serviceParameter;
	}

	/**
	 * @param string service id to handle.
	 */
	public function setServiceID($value)
	{
		$this->_serviceID=$value;
	}

	/**
	 * @return string service id.
	 */
	public function getServiceID()
	{
		return $this->_serviceID;
	}

	/**
	 * @return string url pattern to match. Defaults to ''.
	 */
	public function getPattern()
	{
		return $this->_pattern;
	}

	/**
	 * @param string url pattern to match.
	 */
	public function setPattern($value)
	{
		$this->_pattern = $value;
	}

	/**
	 * @return TAttributeCollection parameter key value pairs.
	 */
	public function getParameters()
	{
		if (!$this->_parameters)
		{
			$this->_parameters=new TAttributeCollection;
			$this->_parameters->setCaseSensitive(true);
		}
		return $this->_parameters;
	}

	/**
	 * @param TAttributeCollection new parameter key value pairs.
	 */
	public function setParameters($value)
	{
		$this->_parameters=$value;
	}

	/**
	 * @return TAttributeCollection constanst parameter key value pairs.
	 * @since 3.2.2
	 */
	public function getConstants()
	{
		if (!$this->_constants)
		{
			$this->_constants = new TAttributeCollection;
			$this->_constants->setCaseSensitive(true);
		}
		return $this->_constants;
	}

	/**
	 * Uses URL pattern (or full regular expression if available) to
	 * match the given url path.
	 * @param THttpRequest the request module
	 * @return array matched parameters, empty if no matches.
	 */
	public function getPatternMatches($request)
	{
		$matches=array();
		if(($pattern=$this->getRegularExpression())!=='')
			preg_match($pattern,$request->getPathInfo(),$matches);
		else
			preg_match($this->getParameterizedPattern(),trim($request->getPathInfo(),'/').'/',$matches);

		if($this->getIsWildCardPattern() && isset($matches[$this->_serviceID]))
			$matches[$this->_serviceID]=str_replace('*',$matches[$this->_serviceID],$this->_serviceParameter);

		if (isset($matches['urlparams']))
		{
			$params=explode('/',$matches['urlparams']);
			if ($this->_separator==='/')
			{
				while($key=array_shift($params))
					$matches[$key]=($value=array_shift($params)) ? $value : '';
			}
			else
			{
				array_pop($params);
				foreach($params as $param)
				{
					list($key,$value)=explode($this->_separator,$param,2);
					$matches[$key]=$value;
				}
			}
			unset($matches['urlparams']);
		}

		if(count($matches) > 0 && $this->_constants)
		{
			foreach($this->_constants->toArray() as $key=>$value)
				$matches[$key] = $value;
		}

		return $matches;
	}

	/**
	 * Returns a value indicating whether to use this pattern to construct URL.
	 * @return boolean whether to enable custom constructUrl. Defaults to true.
	 * @since 3.1.1
	 */
	public function getEnableCustomUrl()
	{
		return $this->_customUrl;
	}

	/**
	 * Sets a value indicating whether to enable custom constructUrl using this pattern
	 * @param boolean whether to enable custom constructUrl.
	 */
	public function setEnableCustomUrl($value)
	{
		$this->_customUrl=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * @return boolean whether this pattern is a wildcard pattern
	 * @since 3.1.4
	 */
	public function getIsWildCardPattern() {
		return $this->_isWildCardPattern;
	}

	/**
	 * @return THttpRequestUrlFormat the format of URLs. Defaults to THttpRequestUrlFormat::Get.
	 */
	public function getUrlFormat()
	{
		return $this->_urlFormat;
	}

	/**
	 * Sets the format of URLs constructed and interpreted by this pattern.
	 * A Get URL format is like index.php?name1=value1&name2=value2
	 * while a Path URL format is like index.php/name1/value1/name2/value.
	 * The separating character between name and value can be configured with
	 * {@link setUrlParamSeparator} and defaults to '/'.
	 * Changing the UrlFormat will affect {@link constructUrl} and how GET variables
	 * are parsed.
	 * @param THttpRequestUrlFormat the format of URLs.
	 * @since 3.1.4
	 */
	public function setUrlFormat($value)
	{
		$this->_urlFormat=TPropertyValue::ensureEnum($value,'THttpRequestUrlFormat');
	}

	/**
	 * @return string separator used to separate GET variable name and value when URL format is Path. Defaults to slash '/'.
	 */
	public function getUrlParamSeparator()
	{
		return $this->_separator;
	}

	/**
	 * @param string separator used to separate GET variable name and value when URL format is Path.
	 * @throws TInvalidDataValueException if the separator is not a single character
	 */
	public function setUrlParamSeparator($value)
	{
		if(strlen($value)===1)
			$this->_separator=$value;
		else
			throw new TInvalidDataValueException('httprequest_separator_invalid');
	}

	/**
	 * @return TUrlMappingPatternSecureConnection the SecureConnection behavior. Defaults to {@link TUrlMappingPatternSecureConnection::Automatic Automatic}
	 * @since 3.2
	 */
	public function getSecureConnection()
	{
		return $this->_secureConnection;
	}

	/**
	 * @param TUrlMappingPatternSecureConnection the SecureConnection behavior.
	 * @since 3.2
	 */
	public function setSecureConnection($value)
	{
		$this->_secureConnection = TPropertyValue::ensureEnum($value, 'TUrlMappingPatternSecureConnection');
	}

	/**
	 * @param array list of GET items to be put in the constructed URL
	 * @return boolean whether this pattern IS the one for constructing the URL with the specified GET items.
	 * @since 3.1.1
	 */
	public function supportCustomUrl($getItems)
	{
		if(!$this->_customUrl || $this->getPattern()===null)
			return false;
		if ($this->_parameters)
		{
			foreach($this->_parameters as $key=>$value)
			{
				if(!isset($getItems[$key]))
					return false;
			}
		}

		if ($this->_constants)
		{
			foreach($this->_constants->toArray() as $key=>$value)
			{
				if (!isset($getItems[$key]))
					return false;
				if ($getItems[$key]!=$value)
					return false;
			}
		}
		return true;
	}

	/**
	 * Constructs a URL using this pattern.
	 * @param array list of GET variables
	 * @param boolean whether the ampersand should be encoded in the constructed URL
	 * @param boolean whether the GET variables should be encoded in the constructed URL
	 * @return string the constructed URL
	 * @since 3.1.1
	 */
	public function constructUrl($getItems,$encodeAmpersand,$encodeGetItems)
	{
		if ($this->_constants)
		{
			foreach($this->_constants->toArray() as $key=>$value)
			{
				unset($getItems[$key]);
			}
		}

		$extra=array();
		$replace=array();
		// for the GET variables matching the pattern, put them in the URL path
		foreach($getItems as $key=>$value)
		{
			if(($this->_parameters && $this->_parameters->contains($key)) || ($key==='*' && $this->getIsWildCardPattern()))
				$replace['{'.$key.'}']=$encodeGetItems ? rawurlencode($value) : $value;
			else
				$extra[$key]=$value;
		}

		$url=$this->_manager->getUrlPrefix().'/'.ltrim(strtr($this->getPattern(),$replace),'/');

		// for the rest of the GET variables, put them in the query string
		if(count($extra)>0)
		{
			if ($this->_urlFormat===THttpRequestUrlFormat::Path && $this->getIsWildCardPattern()) {
				foreach ($extra as $name=>$value)
					$url.='/'.$name.$this->_separator.($encodeGetItems?rawurlencode($value):$value);
				return $url;
			}

			$url2='';
			$amp=$encodeAmpersand?'&amp;':'&';
			if($encodeGetItems)
			{
				foreach($extra as $name=>$value)
				{
					if(is_array($value))
					{
						$name=rawurlencode($name.'[]');
						foreach($value as $v)
							$url2.=$amp.$name.'='.rawurlencode($v);
					}
					else
						$url2.=$amp.rawurlencode($name).'='.rawurlencode($value);
				}
			}
			else
			{
				foreach($extra as $name=>$value)
				{
					if(is_array($value))
					{
						foreach($value as $v)
							$url2.=$amp.$name.'[]='.$v;
					}
					else
						$url2.=$amp.$name.'='.$value;
				}
			}
			$url=$url.'?'.substr($url2,strlen($amp));
		}
		return $this -> applySecureConnectionPrefix($url);
	}

	/**
	 * Apply behavior of {@link SecureConnection} property by conditionaly prefixing
	 * URL with {@link THttpRequest::getBaseUrl()}
	 *
	 * @param string $url
	 * @return string
	 * @since 3.2
	 */
	protected function applySecureConnectionPrefix($url)
	{
		static $request;
		if($request === null) $request = Prado::getApplication() -> getRequest();

		static $isSecureConnection;
		if($isSecureConnection === null) $isSecureConnection = $request -> getIsSecureConnection();

		switch($this -> getSecureConnection())
		{
			case TUrlMappingPatternSecureConnection::EnableIfNotSecure:
				if($isSecureConnection) return $url;
				return $request -> getBaseUrl(true) . $url;
			break;
			case TUrlMappingPatternSecureConnection::DisableIfSecure:
				if(!$isSecureConnection) return $url;
				return $request -> getBaseUrl(false) . $url;
			break;
			case TUrlMappingPatternSecureConnection::Enable:
				return $request -> getBaseUrl(true) . $url;
			break;
			case TUrlMappingPatternSecureConnection::Disable:
				return $request -> getBaseUrl(false) . $url;
			break;
			case TUrlMappingPatternSecureConnection::Automatic:
			default:
				return $url;
			break;
		}
	}
}