<?php
/**
 * CCompareValidator class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CCompareValidator compares the specified attribute value with another value and validates if they are equal.
 *
 * The value being compared with can be another attribute value
 * (specified via {@link compareAttribute}) or a constant (specified via
 * {@link compareValue}. When both are specified, the latter takes
 * precedence. If neither is specified, the attribute will be compared
 * with another attribute whose name is by appending "_repeat" to the source
 * attribute name.
 *
 * The comparison can be either {@link strict} or not.
 *
 * CCompareValidator supports different comparison operators.
 * Previously, it only compares to see if two values are equal or not.
 *
 * When using the {@link message} property to define a custom error message, the message
 * may contain additional placeholders that will be replaced with the actual content. In addition
 * to the "{attribute}" placeholder, recognized by all validators (see {@link CValidator}),
 * CCompareValidator allows for the following placeholders to be specified:
 * <ul>
 * <li>{compareValue}: replaced with the constant value being compared with ({@link compareValue}).</li>
 * <li>{compareAttribute}: replaced with the label of the attribute beeing compared with ({@link compareAttribute}).</li>
 * </ul>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.validators
 * @since 1.0
 */
class CCompareValidator extends CValidator
{
	/**
	 * @var string the name of the attribute to be compared with
	 */
	public $compareAttribute;
	/**
	 * @var string the constant value to be compared with
	 */
	public $compareValue;
	/**
	 * @var boolean whether the comparison is strict (both value and type must be the same.)
	 * Defaults to false.
	 */
	public $strict=false;
	/**
	 * @var boolean whether the attribute value can be null or empty. Defaults to false.
	 * If this is true, it means the attribute is considered valid when it is empty.
	 */
	public $allowEmpty=false;
	/**
	 * @var string the operator for comparison. Defaults to '='.
	 * The followings are valid operators:
	 * <ul>
	 * <li>'=' or '==': validates to see if the two values are equal. If {@link strict} is true, the comparison
	 * will be done in strict mode (i.e. checking value type as well).</li>
	 * <li>'!=': validates to see if the two values are NOT equal. If {@link strict} is true, the comparison
	 * will be done in strict mode (i.e. checking value type as well).</li>
	 * <li>'>': validates to see if the value being validated is greater than the value being compared with.</li>
	 * <li>'>=': validates to see if the value being validated is greater than or equal to the value being compared with.</li>
	 * <li>'<': validates to see if the value being validated is less than the value being compared with.</li>
	 * <li>'<=': validates to see if the value being validated is less than or equal to the value being compared with.</li>
	 * </ul>
	 */
	public $operator='=';

	/**
	 * Validates the attribute of the object.
	 * If there is any error, the error message is added to the object.
	 * @param CModel $object the object being validated
	 * @param string $attribute the attribute being validated
	 */
	protected function validateAttribute($object,$attribute)
	{
		$value=$object->$attribute;
		if($this->allowEmpty && $this->isEmpty($value))
			return;
		if($this->compareValue!==null)
			$compareTo=$compareValue=$this->compareValue;
		else
		{
			$compareAttribute=$this->compareAttribute===null ? $attribute.'_repeat' : $this->compareAttribute;
			$compareValue=$object->$compareAttribute;
			$compareTo=$object->getAttributeLabel($compareAttribute);
		}

		switch($this->operator)
		{
			case '=':
			case '==':
				if(($this->strict && $value!==$compareValue) || (!$this->strict && $value!=$compareValue))
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be repeated exactly.');
				break;
			case '!=':
				if(($this->strict && $value===$compareValue) || (!$this->strict && $value==$compareValue))
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must not be equal to "{compareValue}".');
				break;
			case '>':
				if($value<=$compareValue)
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be greater than "{compareValue}".');
				break;
			case '>=':
				if($value<$compareValue)
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be greater than or equal to "{compareValue}".');
				break;
			case '<':
				if($value>=$compareValue)
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be less than "{compareValue}".');
				break;
			case '<=':
				if($value>$compareValue)
					$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} must be less than or equal to "{compareValue}".');
				break;
			default:
				throw new CException(Yii::t('yii','Invalid operator "{operator}".',array('{operator}'=>$this->operator)));
		}
		if(!empty($message))
			$this->addError($object,$attribute,$message,array('{compareAttribute}'=>$compareTo,'{compareValue}'=>$compareValue));
	}

	/**
	 * Returns the JavaScript needed for performing client-side validation.
	 * @param CModel $object the data object being validated
	 * @param string $attribute the name of the attribute to be validated.
	 * @return string the client-side validation script.
	 * @see CActiveForm::enableClientValidation
	 * @since 1.1.7
	 */
	public function clientValidateAttribute($object,$attribute)
	{
		if($this->compareValue !== null)
		{
			$compareTo=$this->compareValue;
			$compareValue=CJSON::encode($this->compareValue);
		}
		else
		{
			$compareAttribute=$this->compareAttribute === null ? $attribute . '_repeat' : $this->compareAttribute;
			$compareValue="jQuery('#" . (CHtml::activeId($object, $compareAttribute)) . "').val()";
			$compareTo=$object->getAttributeLabel($compareAttribute);
		}

		$message=$this->message;
		switch($this->operator)
		{
			case '=':
			case '==':
				if($message===null)
					$message=Yii::t('yii','{attribute} must be repeated exactly.');
				$condition='value!='.$compareValue;
				break;
			case '!=':
				if($message===null)
					$message=Yii::t('yii','{attribute} must not be equal to "{compareValue}".');
				$condition='value=='.$compareValue;
				break;
			case '>':
				if($message===null)
					$message=Yii::t('yii','{attribute} must be greater than "{compareValue}".');
				$condition='parseFloat(value)<=parseFloat('.$compareValue.')';
				break;
			case '>=':
				if($message===null)
					$message=Yii::t('yii','{attribute} must be greater than or equal to "{compareValue}".');
				$condition='parseFloat(value)<parseFloat('.$compareValue.')';
				break;
			case '<':
				if($message===null)
					$message=Yii::t('yii','{attribute} must be less than "{compareValue}".');
				$condition='parseFloat(value)>=parseFloat('.$compareValue.')';
				break;
			case '<=':
				if($message===null)
					$message=Yii::t('yii','{attribute} must be less than or equal to "{compareValue}".');
				$condition='parseFloat(value)>parseFloat('.$compareValue.')';
				break;
			default:
				throw new CException(Yii::t('yii','Invalid operator "{operator}".',array('{operator}'=>$this->operator)));
		}

		$message=strtr($message,array(
			'{attribute}'=>$object->getAttributeLabel($attribute),
			'{compareAttribute}'=>$compareTo,
		));

		return "
if(".($this->allowEmpty ? "jQuery.trim(value)!='' && " : '').$condition.") {
	messages.push(".CJSON::encode($message).".replace('{compareValue}', ".$compareValue."));
}
";
	}
}
