<?php
/**
 * TJuiControlOptions class file.
 *
 * @author Fabio Bas <ctrlaltca@gmail.com>
 * @link https://github.com/pradosoft/prado
 * @copyright Copyright &copy; 2013-2015 PradoSoft
 * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
 * @package System.Web.UI.JuiControls
 */

/**
 * IJuiOptions interface
 *
 * IJuiOptions is the interface that must be implemented by controls using
 * {@link TJuiControlOptions}.
 *
 * @author Fabio Bas <ctrlaltca@gmail.com>
 * @package System.Web.UI.JuiControls
 * @since 3.3
 */
interface IJuiOptions
{
	public function getWidget();
	public function getWidgetID();
	public function getOptions();
	public function getValidOptions();
	public function getValidEvents();
}

/**
 * TJuiControlOptions interface
 *
 * TJuiControlOptions is an helper class that can collect a list of options
 * for a control. The control must implement {@link IJuiOptions}.
 * The options are validated againg an array of valid options provided by the control itself.
 * Since component properties are case insensitive, the array of valid options is used
 * to ensure the option name has the correct case.
 * The options array can then get retrieved using {@link toArray} and applied to the jQuery-ui widget.
 * In addition to the options, this class will render the needed javascript to raise a callback
 * for any event for which an handler is defined in the control.
 *
 * @author Fabio Bas <ctrlaltca@gmail.com>
 * @package System.Web.UI.JuiControls
 * @since 3.3
 */
class TJuiControlOptions
{
	/**
	 * @var TMap map of javascript options.
	 */
	private $_options;
	/**
	 * @var TControl parent control.
	 */
	private $_control;

	/**
	 * Constructor. Set the parent control owning these options.
	 * @param TControl parent control
	 */
	public function __construct($control)
	{
    $this->setControl($control);
	}

	/**
	 * Sets the parent control.
	 * @param TControl $control
	 * @throws THttpException
	 */
	public function setControl($control)
	{
	  if(!$control instanceof IJuiOptions)
	    throw new THttpException(500,'juioptions_control_invalid',$control->ID);
	  $this->_control=$control;
	}

	/**
	 * Sets a named options with a value. Options are used to store and retrive
	 * named values for the javascript control.
	 * @param string option name.
	 * @param mixed option value.
	 * @throws THttpException
	 */
	public function __set($name,$value)
	{
		if($this->_options===null)
			$this->_options=array();

		foreach($this->_control->getValidOptions() as $option)
		{
			if(0 == strcasecmp($name, $option))
			{
				$low = strtolower($value);
				if($low === 'null')
				{
					$this->_options[$option] = null;
				} elseif($low === 'true') {
					$this->_options[$option] = true;
				} elseif($low === 'false') {
					$this->_options[$option] = false;
				} elseif(is_numeric($value)) {
					// trick to get float or integer automatically when needed
					$this->_options[$option] = $value + 0;
				} elseif(substr($low,0,8)=='function') {
					$this->_options[$option] = new TJavaScriptLiteral($value);
				} else {
					$this->_options[$option] = $value;
				}
				return;
			}
		}

		throw new THttpException(500,'juioptions_option_invalid',$this->_control->ID, $name);
	}

	/**
	 * Gets an option named value. Options are used to store and retrive
	 * named values for the base active controls.
	 * @param string option name.
	 * @return mixed options value or null if not set.
	 */
	public function __get($name)
	{
		if($this->_options===null)
			$this->_options=array();

		foreach($this->_control->getValidOptions() as $option)
		{
			if(0 == strcasecmp($name, $option) && isset($this->_options[$option]))
			{
				return $this->_options[$option];
			}
		}

		return null;
	}

	/**
	 * Only serialize the options itself, not the corresponding parent control.
	 * @return mixed array with the names of all variables of that object that should be serialized.
	 */
	public function __sleep() {
	  return array('_options');
	}

	/**
	 * @return Array of active control options
	 */
	public function toArray()
	{
		$ret= ($this->_options===null) ? array() : $this->_options;

		foreach($this->_control->getValidEvents() as $event)
			if($this->_control->hasEventHandler('on'.$event))
				$ret[$event]=new TJavaScriptLiteral("function( event, ui ) { Prado.JuiCallback(".TJavascript::encode($this->_control->getUniqueID()).", ".TJavascript::encode($event).", event, ui, this); }");

		return $ret;
	}

	/**
	 * Raise the specific callback event handler of the target control.
	 * @param mixed callback parameters
	 */
	public function raiseCallbackEvent($param)
	{
		$callbackParam=$param->CallbackParameter;
		if(isset($callbackParam->event))
		{
			$eventName = 'On'.ucfirst($callbackParam->event);
			if($this->_control->hasEventHandler($eventName))
			{
				$this->_control->$eventName( new TJuiEventParameter(
					$this->_control->getResponse(),
					isset($callbackParam->ui) ? $callbackParam->ui : null)
				);
			}
		}
	}
}