<?php
/**
 * TTranslate, I18N translation component.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id$
 * @package System.I18N
 */

/**
 * Get the parent control class.
 */
Prado::using('System.I18N.TI18NControl');

/**
 * TTranslate class.
 *
 * This component performs message/string translation. The translation
 * source is set in the TGlobalization handler. The following example
 * demonstrated a simple message translation.
 * <code>
 * <com:TTranslate Text="Goodbye" />
 * </code>
 *
 * Depending on the culture set on the page, the phrase "Goodbye" will
 * be translated.
 *
 * The {@link getParameters Parameters} property can be use to add name values pairs for
 * substitution. Substrings enclosed with "{" and "}" in the translation message are consider as the
 * parameter names during substitution lookup. The following example will substitute the substring
 * "{time}" with the value of the parameter attribute "Parameters.time=<%= time() %>. Note that
 * the value of the parameter named "time" is evaluated.
 * <code>
 * <com:TTranslate Parameters.time=<%= time() %> >
 *   The unix-time is "{time}".
 * </com:TTranslate>
 * </code>
 *
 * More complex string substitution can be applied using the
 * TTranslateParameter component.
 *
 * Namespace: System.I18N
 *
 * Properties
 * - <b>Text</b>, string,
 *   <br>Gets or sets the string to translate.
 * - <b>Catalogue</b>, string,
 *   <br>Gets or sets the catalogue for message translation. The
 *    default catalogue can be set by the @Page directive.
 * - <b>Key</b>, string,
 *   <br>Gets or sets the key used to message look up.
 * - <b>Trim</b>, boolean,
 *   <br>Gets or sets an option to trim the contents.
 *   Default is to trim the contents.
 *
 * @author Xiang Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version v1.0, last update on Fri Dec 24 21:38:49 EST 2004
 * @package System.I18N
 */
class TTranslate extends TI18NControl
{
	/**
	 * @return string the text to be localized/translated.
	 */
	public function getText()
	{
		return $this->getViewState('Text','');
	}

	/**
	 * Sets the text for localization.
	 * @param string the text for translation.
	 */
	public function setText($value)
	{
		$this->setViewState('Text',$value,'');
	}

	/**
	 * Set the key for message lookup.
	 * @param string key
	 */
	public function setKey($value)
	{
		$this->setViewState('Key',$value,'');
	}

	/**
	 * Get the key for message lookup.
	 * @return string key
	 */
	public function getKey()
	{
		return $this->getViewState('Key','');
	}

	/**
	 * Get the message catalogue.
	 * @return string catalogue.
	 */
	public function getCatalogue()
	{
		return $this->getViewState('Catalogue','');
	}

	/**
	 * Set the message catalogue.
	 * @param string catalogue.
	 */
	public function setCatalogue($value)
	{
		$this->setViewState('Catalogue',$value,'');
	}

	/**
	 * Set the option to trim the contents.
	 * @param boolean trim or not.
	 */
	public function setTrim($value)
	{
		$this->setViewState('Trim',TPropertyValue::ensureBoolean($value),true);
	}

	/**
	 * Trim the content or not.
	 * @return boolean trim or not.
	 */
	public function getTrim()
	{
		return $this->getViewState('Trim',true);
	}

	/**
	 * Returns the list of custom parameters.
	 * Custom parameters are name-value pairs that may subsititute translation
	 * place holders during rendering.
	 * @return TAttributeCollection the list of custom parameters
	 */
	public function getParameters()
	{
		if($parameters=$this->getViewState('Parameters',null))
			return $parameters;
		else
		{
			$parameters=new TAttributeCollection;
			$parameters->setCaseSensitive(true);
			$this->setViewState('Parameters',$parameters,null);
			return $parameters;
		}
	}

	/**
	 * @return boolean whether the named parameter exists
	 */
	public function hasParameter($name)
	{
		if($parameters=$this->getViewState('Parameters',null))
			return $parameters->contains($name);
		else
			return false;
	}

	/**
	 * @return string parameter value, null if parameter does not exist
	 */
	public function getParameter($name)
	{
		if($parameters=$this->getViewState('Parameters',null))
			return $parameters->itemAt($name);
		else
			return null;
	}

	/**
	 * @param string parameter name
	 * @param string value of the parameter
	 */
	public function setParameter($name,$value)
	{
		$this->getParameters()->add($name,$value);
	}

	/**
	 * Removes the named parameter.
	 * @param string the name of the parameter to be removed.
	 * @return string parameter value removed, null if parameter does not exist.
	 */
	public function removeParameter($name)
	{
		if($parameters=$this->getViewState('Parameters',null))
			return $parameters->remove($name);
		else
			return null;
	}

	/**
	 * renders the translated string.
	 */
	public function render($writer)
	{
		$htmlWriter = Prado::createComponent($this->GetResponse()->getHtmlWriterType(), new TTextWriter());
		$subs = array();
		foreach($this->getParameters() as $key => $value)
			$subs['{'.$key.'}'] = $value;
		foreach($this->getControls() as $control)
		{
			if($control instanceof TTranslateParameter)
				$subs['{'.$control->getKey().'}'] = $control->getParameter();
			elseif($control instanceof TControl)
				$control->render($htmlWriter);
			elseif(is_string($control))
				$htmlWriter->write($control);
		}

		$text = $this->getText();
		if(strlen($text)==0)
			$text = $htmlWriter->flush();
		if($this->getTrim())
			$text = trim($text);

		$writer->write($this->translateText($text, $subs));
	}

	/**
	 * Translates the text with subsititution.
	 * @param string text for translation
	 * @param array list of substitutions
	 * @return string translated text
	 */
	protected function translateText($text, $subs)
	{
		$app = $this->getApplication()->getGlobalization();

		//no translation handler provided
		if(($config = $app->getTranslationConfiguration())===null)
			return strtr($text, $subs);

		$catalogue = $this->getCatalogue();
		if(empty($catalogue) && isset($config['catalogue']))
			$catalogue = $config['catalogue'];
		if (empty($catalogue)) $catalogue='messages';
		Translation::init($catalogue);
			
		$key = $this->getKey();
		if(!empty($key)) $text = $key;

		//translate it
		return Translation::formatter($catalogue)->format($text,
										$subs, $catalogue, $this->getCharset());
	}
}