<?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\Exceptions\TConfigurationException;
use Prado\Prado;
use Prado\TApplication;
use Prado\TPropertyValue;
use Prado\Xml\TXmlDocument;
use Prado\Xml\TXmlElement;

/**
 * TUrlMapping Class
 *
 * The TUrlMapping module allows PRADO to construct and recognize URLs
 * based on specific patterns.
 *
 * TUrlMapping consists of a list of URL patterns which are used to match
 * against the currently requested URL. The first matching pattern will then
 * be used to decompose the URL into request parameters (accessible through
 * <code>$this->Request['paramname']</code>).
 *
 * The patterns can also be used to construct customized URLs. In this case,
 * the parameters in an applied pattern will be replaced with the corresponding
 * GET variable values.
 *
 * Since it is derived from {@link TUrlManager}, it should be configured globally
 * in the application configuration like the following,
 * <code>
 *  <module id="request" class="THttpRequest" UrlManager="friendly-url" />
 *  <module id="friendly-url" class="System.Web.TUrlMapping" EnableCustomUrl="true">
 *    <url ServiceParameter="Posts.ViewPost" pattern="post/{id}/" parameters.id="\d+" />
 *    <url ServiceParameter="Posts.ListPost" pattern="archive/{time}/" parameters.time="\d{6}" />
 *    <url ServiceParameter="Posts.ListPost" pattern="category/{cat}/" parameters.cat="\d+" />
 *  </module>
 * </code>
 *
 * In the above, each <tt>&lt;url&gt;</tt> element specifies a URL pattern represented
 * as a {@link TUrlMappingPattern} internally. You may create your own pattern classes
 * by extending {@link TUrlMappingPattern} and specifying the <tt>&lt;class&gt;</tt> attribute
 * in the element.
 *
 * The patterns can be also be specified in an external file using the {@link setConfigFile ConfigFile} property.
 *
 * The URL mapping are evaluated in order, only the first mapping that matches
 * the URL will be used. Cascaded mapping can be achieved by placing the URL mappings
 * in particular order. For example, placing the most specific mappings first.
 *
 * Only the PATH_INFO part of the URL is used to match the available patterns. The matching
 * is strict in the sense that the whole pattern must match the whole PATH_INFO of the URL.
 *
 * From PRADO v3.1.1, TUrlMapping also provides support for constructing URLs according to
 * the specified pattern. You may enable this functionality by setting {@link setEnableCustomUrl EnableCustomUrl} to true.
 * When you call THttpRequest::constructUrl() (or via TPageService::constructUrl()),
 * TUrlMapping will examine the available URL mapping patterns using their {@link TUrlMappingPattern::getServiceParameter ServiceParameter}
 * and {@link TUrlMappingPattern::getPattern Pattern} properties. A pattern is applied if its
 * {@link TUrlMappingPattern::getServiceParameter ServiceParameter} matches the service parameter passed
 * to constructUrl() and every parameter in the {@link getPattern Pattern} is found
 * in the GET variables.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @package Prado\Web
 * @since 3.0.5
 */
class TUrlMapping extends TUrlManager
{
	/**
	 * @var TUrlMappingPattern[] list of patterns.
	 */
	protected $_patterns=array();
	/**
	 * @var TUrlMappingPattern matched pattern.
	 */
	private $_matched;
	/**
	 * @var string external configuration file
	 */
	private $_configFile=null;
	/**
	 * @var boolean whether to enable custom contructUrl
	 */
	private $_customUrl=false;
	/**
	 * @var array rules for constructing URLs
	 */
	protected $_constructRules=array();

	private $_urlPrefix='';

	private $_defaultMappingClass='System.Web.TUrlMappingPattern';

	/**
	 * Initializes this module.
	 * This method is required by the IModule interface.
	 * @param mixed configuration for this module, can be null
	 * @throws TConfigurationException if module is configured in the global scope.
	 */
	public function init($config)
	{
		parent::init($config);
		if($this->getRequest()->getRequestResolved())
			throw new TConfigurationException('urlmapping_global_required');
		if($this->_configFile!==null)
			$this->loadConfigFile();
		$this->loadUrlMappings($config);
		if($this->_urlPrefix==='')
		{
			$request=$this->getRequest();
			if($request->getUrlFormat()===THttpRequestUrlFormat::HiddenPath)
			{
				$this->_urlPrefix=dirname($request->getApplicationUrl());
			} else {
				$this->_urlPrefix=$request->getApplicationUrl();
			}
		}
		$this->_urlPrefix=rtrim($this->_urlPrefix,'/');
	}

	/**
	 * Initialize the module from configuration file.
	 * @throws TConfigurationException if {@link getConfigFile ConfigFile} is invalid.
	 */
	protected function loadConfigFile()
	{
		if(is_file($this->_configFile))
		{
			if($this->getApplication()->getConfigurationType()==TApplication::CONFIG_TYPE_PHP)
			{
				$config = include $this->_configFile;
				$this->loadUrlMappings($dom);
			}
			else
			{
				$dom=new TXmlDocument;
				$dom->loadFromFile($this->_configFile);
				$this->loadUrlMappings($dom);
			}
		}
		else
			throw new TConfigurationException('urlmapping_configfile_inexistent',$this->_configFile);
	}

	/**
	 * Returns a value indicating whether to enable custom constructUrl.
	 * If true, constructUrl() will make use of the URL mapping rules to
	 * construct valid URLs.
	 * @return boolean whether to enable custom constructUrl. Defaults to false.
	 * @since 3.1.1
	 */
	public function getEnableCustomUrl()
	{
		return $this->_customUrl;
	}

	/**
	 * Sets a value indicating whether to enable custom constructUrl.
	 * If true, constructUrl() will make use of the URL mapping rules to
	 * construct valid URLs.
	 * @param boolean whether to enable custom constructUrl.
	 * @since 3.1.1
	 */
	public function setEnableCustomUrl($value)
	{
		$this->_customUrl=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * @return string the part that will be prefixed to the constructed URLs. Defaults to the requested script path (e.g. /path/to/index.php for a URL http://hostname/path/to/index.php)
	 * @since 3.1.1
	 */
	public function getUrlPrefix()
	{
		return $this->_urlPrefix;
	}

	/**
	 * @param string the part that will be prefixed to the constructed URLs. This is used by constructUrl() when EnableCustomUrl is set true.
	 * @see getUrlPrefix
	 * @since 3.1.1
	 */
	public function setUrlPrefix($value)
	{
		$this->_urlPrefix=$value;
	}

	/**
	 * @return string external configuration file. Defaults to null.
	 */
	public function getConfigFile()
	{
		return $this->_configFile;
	}

	/**
	 * @param string external configuration file in namespace format. The file
	 * must be suffixed with '.xml'.
	 * @throws TInvalidDataValueException if the file is invalid.
	 */
	public function setConfigFile($value)
	{
		if(($this->_configFile=Prado::getPathOfNamespace($value,$this->getApplication()->getConfigurationFileExt()))===null)
			throw new TConfigurationException('urlmapping_configfile_invalid',$value);
	}

	/**
	 * @return string the default class of URL mapping patterns. Defaults to TUrlMappingPattern.
	 * @since 3.1.1
	 */
	public function getDefaultMappingClass()
	{
		return $this->_defaultMappingClass;
	}

	/**
	 * Sets the default class of URL mapping patterns.
	 * When a URL matching pattern does not specify "class" attribute, it will default to the class
	 * specified by this property. You may use either a class name or a namespace format of class (if the class needs to be included first.)
	 * @param string the default class of URL mapping patterns.
	 * @since 3.1.1
	 */
	public function setDefaultMappingClass($value)
	{
		$this->_defaultMappingClass=$value;
	}

	/**
	 * Load and configure each url mapping pattern.
	 * @param mixed configuration node
	 * @throws TConfigurationException if specific pattern class is invalid
	 */
	protected function loadUrlMappings($config)
	{
		$defaultClass = $this->getDefaultMappingClass();

		if(is_array($config))
		{
			if(isset($config['urls']) && is_array($config['urls']))
			{
				foreach($config['urls'] as $url)
				{
					$class=isset($url['class'])?$url['class']:$defaultClass;
					$properties = isset($url['properties'])?$url['properties']:array();
					$this->buildUrlMapping($class,$properties,$url);
				}
			}
		}
		else
		{
			foreach($config->getElementsByTagName('url') as $url)
			{
				$properties=$url->getAttributes();
				if(($class=$properties->remove('class'))===null)
					$class=$defaultClass;
				$this->buildUrlMapping($class,$properties,$url);
			}
		}
	}

	private function buildUrlMapping($class, $properties, $url)
	{
		$pattern=Prado::createComponent($class,$this);
		if(!($pattern instanceof TUrlMappingPattern))
			throw new TConfigurationException('urlmapping_urlmappingpattern_required');
		foreach($properties as $name=>$value)
			$pattern->setSubproperty($name,$value);

		if($url instanceof TXmlElement) {
			$text = $url -> getValue();
			if($text) {
				$text = preg_replace('/(\s+)/S', '', $text);
				if(($regExp = $pattern->getRegularExpression()) !== '')
				trigger_error(sPrintF('%s.RegularExpression property value "%s" for ServiceID="%s" and ServiceParameter="%s" was replaced by node value "%s"',
				get_class($pattern),
				$regExp,
				$pattern->getServiceID(),
				$pattern->getServiceParameter(),
				$text),
				E_USER_NOTICE);
				$pattern->setRegularExpression($text);
			}
		}

		$this->_patterns[]=$pattern;
		$pattern->init($url);

		$key=$pattern->getServiceID().':'.$pattern->getServiceParameter();
		$this->_constructRules[$key][]=$pattern;
	}

	/**
	 * Parses the request URL and returns an array of input parameters.
	 * This method overrides the parent implementation.
	 * The input parameters do not include GET and POST variables.
	 * This method uses the request URL path to find the first matching pattern. If found
	 * the matched pattern parameters are used to return as the input parameters.
	 * @return array list of input parameters
	 */
	public function parseUrl()
	{
		$request=$this->getRequest();
		foreach($this->_patterns as $pattern)
		{
			$matches=$pattern->getPatternMatches($request);
			if(count($matches)>0)
			{
				$this->_matched=$pattern;
				$params=array();
				foreach($matches as $key=>$value)
				{
					if(is_string($key))
						$params[$key]=$value;
				}
				if (!$pattern->getIsWildCardPattern())
					$params[$pattern->getServiceID()]=$pattern->getServiceParameter();
				return $params;
			}
		}
		return parent::parseUrl();
	}

	/**
	 * Constructs a URL that can be recognized by PRADO.
	 *
	 * This method provides the actual implementation used by {@link THttpRequest::constructUrl}.
	 * Override this method if you want to provide your own way of URL formatting.
	 * If you do so, you may also need to override {@link parseUrl} so that the URL can be properly parsed.
	 *
	 * The URL is constructed as the following format:
	 * /entryscript.php?serviceID=serviceParameter&get1=value1&...
	 * If {@link THttpRequest::setUrlFormat THttpRequest.UrlFormat} is 'Path',
	 * the following format is used instead:
	 * /entryscript.php/serviceID/serviceParameter/get1,value1/get2,value2...
	 * If {@link THttpRequest::setUrlFormat THttpRequest.UrlFormat} is 'HiddenPath',
	 * the following format is used instead:
	 * /serviceID/serviceParameter/get1,value1/get2,value2...
	 * @param string service ID
	 * @param string service parameter
	 * @param array GET parameters, null if not provided
	 * @param boolean whether to encode the ampersand in URL
	 * @param boolean whether to encode the GET parameters (their names and values)
	 * @return string URL
	 * @see parseUrl
	 * @since 3.1.1
	 */
	public function constructUrl($serviceID,$serviceParam,$getItems,$encodeAmpersand,$encodeGetItems)
	{
		if($this->_customUrl)
		{
			if(!(is_array($getItems) || ($getItems instanceof \Traversable)))
				$getItems=array();
			$key=$serviceID.':'.$serviceParam;
			$wildCardKey = ($pos=strrpos($serviceParam,'.'))!==false ?
				$serviceID.':'.substr($serviceParam,0,$pos).'.*' : $serviceID.':*';
			if(isset($this->_constructRules[$key]))
			{
				foreach($this->_constructRules[$key] as $rule)
				{
					if($rule->supportCustomUrl($getItems))
						return $rule->constructUrl($getItems,$encodeAmpersand,$encodeGetItems);
				}
			}
			elseif(isset($this->_constructRules[$wildCardKey]))
			{
				foreach($this->_constructRules[$wildCardKey] as $rule)
				{
					if($rule->supportCustomUrl($getItems))
					{
						$getItems['*']= $pos ? substr($serviceParam,$pos+1) : $serviceParam;
						return $rule->constructUrl($getItems,$encodeAmpersand,$encodeGetItems);
					}
				}
			}
		}
		return parent::constructUrl($serviceID,$serviceParam,$getItems,$encodeAmpersand,$encodeGetItems);
	}

	/**
	 * @return TUrlMappingPattern the matched pattern, null if not found.
	 */
	public function getMatchingPattern()
	{
		return $this->_matched;
	}
}