<?php
/**
 * TRatingList class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web\UI\WebControls
 */

namespace Prado\Web\UI\WebControls;
use Prado\TPropertyValue;
use Prado\Exceptions\TInvalidDataValueException;

/**
 * TRatingList class.
 *
 * This class is EXPERIMENTAL.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @author Bradley Booms <bradley[dot]booms[at]gmail[dot]com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
class TRatingList extends TRadioButtonList
{
	/**
	 * Script path relative to the TClientScriptManager::SCRIPT_PATH
	 */
	const SCRIPT_PATH='prado/ratings';

	/**
	 * @var array list of published rating images.
	 */
	private $_ratingImages = array();

	/**
	 * Sets the default repeat direction to horizontal.
	 */
	public function __construct()
	{
		parent::__construct();
		$this->setRepeatDirection(TRepeatDirection::Horizontal);
	}

	/**
	 * @return boolean whether the items in the column can be edited. Defaults to false.
	 */
	public function getReadOnly()
	{
		return $this->getViewState('ReadOnly',false);
	}

	/**
	 * @param boolean whether the items in the column can be edited
	 */
	public function setReadOnly($value)
	{
		$this->setViewState('ReadOnly',TPropertyValue::ensureBoolean($value),false);
	}

	/**
	 * Wrapper for {@link setReadOnly ReadOnly} property.
	 * @return boolean whether the rating list can be edited. Defaults to true.
	 */
	public function getAllowInput()
	{
		return !$this->getReadOnly();
	}

	/**
	 * Wrapper for {@link setReadOnly ReadOnly} property.
	 * @param boolean whether the rating list can be edited
	 */
	public function setAllowInput($value)
	{
		$this->setReadOnly(!TPropertyValue::ensureBoolean($value));
	}

	/**
	 * Wrapper for {@link setReadOnly ReadOnly} property.
	 * @param boolean whether the rating list can be edited
	 */
	public function setEnabled($value)
	{
		$this->setReadOnly(!TPropertyValue::ensureBoolean($value));
	}

	/**
	 * The repeat layout must be Table.
	 * @param string repeat layout type
	 * @throws TInvaliddataValueException when repeat layout is not Table.
	 */
	public function setRepeatLayout($value)
	{
		if($value!==TRepeatLayout::Table)
			throw new TInvalidDataValueException('ratinglist_table_layout_only');
		else
			parent::setRepeatLayout($value);
	}

	/**
	 * @return float rating value.
	 */
	public function getRating()
	{
		$rating = $this->getViewState('Rating', null);
		if ($rating === null)
			return $this->getSelectedIndex()+1;
		else
			return $rating;
	}

	/**
	 * @param float rating value, also sets the selected Index
	 */
	public function setRating($value)
	{
		$value = TPropertyValue::ensureFloat($value);
		$this->setViewState('Rating', $value, null);
		$index = $this->getRatingIndex($value);
		parent::setSelectedIndex($index);
	}

	public function setSelectedIndex($value)
	{
		$this->setRating($value+1);
		parent::setSelectedIndex($value);
	}

	/**
	 * @param float rating value
	 * @return int rating as integer
	 */
	protected function getRatingIndex($rating)
	{
		$interval = $this->getHalfRatingInterval();
		$base = intval($rating)-1;
		$remainder = $rating-$base-1;
		return $remainder > $interval[1] ? $base+1 : $base;
	}

	/**
	 * @param int change the rating selection index
	 */
	public function onSelectedIndexChanged($param)
	{
		$value = $this->getRating();
		$value = TPropertyValue::ensureInteger($value);
		$this->setRating($value);
		parent::onSelectedIndexChanged($param);
	}

	/**
	 * @return string control or html element ID for displaying a caption.
	 */
	public function getCaptionID()
	{
		return $this->getViewState('CaptionID', '');
	}

	/**
	 * @param string control or html element ID for displaying a caption.
	 */
	public function setCaptionID($value)
	{
		$this->setViewState('CaptionID', $value, '');
	}

	protected function getCaptionControl()
	{
		if(($id=$this->getCaptionID())!=='')
		{
			if($control=$this->getPage()->findControl($id))
				return $control;
			if($control=$this->getNamingContainer()->findControl($id))
				return $control;
		}
		throw new TInvalidDataValueException(
			'ratinglist_invalid_caption_id',$id,$this->getID());
	}

	/**
	 * @return string caption text. Default is "Rate It:".
	 */
	public function getCaption()
	{
		return $this->getCaptionControl()->getText();
	}

	/**
	 * @return TRatingListStyle current rating style
	 */
 	public function setCaption($value)
 	{
		$this->getCaptionControl()->setText($value);
 	}

	/**
	 * @param string set the rating style, default is "default"
	 */
	public function setRatingStyle($value)
 	{
	   $this->setViewState('RatingStyle', $value, 'default');
 	}

	/**
	 * @return TRatingListStyle current rating style
	 */
	public function getRatingStyle()
 	{
	   return $this->getViewState('RatingStyle', 'default');
 	}

 	/**
	 * @return string rating style css class name.
 	 */
	protected function getRatingStyleCssClass()
 	{
		return 'TRatingList_'.$this->getRatingStyle();
 	}

	/**
	 * Sets the interval such that those rating values within the interval
	 * will be considered as a half star rating.
	 * @param array rating display half value interval, default is array(0.3, 0.7);
	 */
	public function setHalfRatingInterval($value)
 	{
		$this->setViewState('HalfRating',
				TPropertyValue::ensureArray($value), array(0.3, 0.7));
 	}

	/**
	 * @return array rating display half value interval, default is array(0.3, 0.7);
	 */
	public function getHalfRatingInterval()
 	{
		return $this->getViewState('HalfRating', array(0.3, 0.7));
 	}

	/**
	 * @return array list of post back options.
	 */
	protected function getPostBackOptions()
 	{
		$options = parent::getPostBackOptions();
		$options['AutoPostBack'] = $this->getAutoPostBack();
		$options['ReadOnly'] = $this->getReadOnly();
		$options['Style'] = $this->getRatingStyleCssClass();
		$options['CaptionID'] = $this->getCaptionControlID();
		$options['SelectedIndex'] = $this->getSelectedIndex();
		$options['Rating'] = $this->getRating();
		$options['HalfRating'] = $this->getHalfRatingInterval();
		return $options;
 	}

 	/**
	 * @return string find the client ID of the caption control.
 	 */
	protected function getCaptionControlID()
 	{
		if(($id=$this->getCaptionID())!=='')
 		{
			if($control=$this->getParent()->findControl($id))
			{
				if($control->getVisible(true))
					return $control->getClientID();
			}
			else
				return $id;
 		}
		return '';
 	}

	/**
	 * Publish the the rating style css file and rating image files.
	 */
	public function onPreRender($param)
 	{
		parent::onPreRender($param);
		$this->publishStyle($this->getRatingStyle());
		$this->_ratingImages = $this->publishImages($this->getRatingStyle());
 		$this->registerClientScript();
	}

	/**
	 * @param string rating style name
	 * @return string URL of the css style file
	 */
	protected function publishStyle($style)
 	{
		$cs = $this->getPage()->getClientScript();
		$url = $this->getAssetUrl($style.'.css');
		if(!$cs->isStyleSheetFileRegistered($url))
			$cs->registerStyleSheetFile($url, $url);
		return $url;
 	}

	/**
	 * @param string rating style name
	 * @param string rating image file extension, default is '.gif'
	 * @return array URL of publish the rating images
	 */
	protected function publishImages($style, $fileExt='.gif')
 	{
		$types = array('blank', 'selected', 'half', 'combined');
		$files = array();
		foreach($types as $type)
			$files[$type] = $this->getAssetUrl("{$style}_{$type}{$fileExt}");
		return $files;
 	}

	/**
	 * Registers the relevant JavaScript.
	 */
	protected function registerClientScript()
	{
		$cs=$this->getPage()->getClientScript();
		$cs->registerPradoScript('ratings');
	}

	/**
	 * @param string asset file in the self::SCRIPT_PATH directory.
	 * @return string asset file url.
	 */
	protected function getAssetUrl($file='')
 	{
		$base = $this->getPage()->getClientScript()->getPradoScriptAssetUrl();
		return $base.'/'.self::SCRIPT_PATH.'/'.$file;
 	}

	/**
	 * Add rating style class name to the class attribute
	 * when {@link setReadOnly ReadOnly} property is true and when the
	 * {@link setCssClass CssClass} property is empty.
	 * @param THtmlWriter renderer
	 */
	public function render($writer)
 	{
		$writer->addAttribute('id',$this->getClientID());
		$this->getPage()->getClientScript()->registerPostBackControl(
			$this->getClientClassName(), $this->getPostBackOptions());
		parent::render($writer);
 	}

	/**
	 * Gets the name of the javascript class responsible for performing postback for this control.
	 * This method overrides the parent implementation.
	 * @return string the javascript class name
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TRatingList';
	}
}