<?php
class DateCompareValidator extends CValidator {
	/**
	 * @var mixed the format pattern that the date value should follow.
	 * This can be either a string or an array representing multiple formats.
	 * Defaults to 'MM/dd/yyyy'. Please see {@link CDateTimeParser} for details
	 * about how to specify a date format.
	 */
	public $format='MM/dd/yyyy';
	/**
	 * @var boolean whether the attribute value can be null or empty. Defaults to true,
	 * meaning that if the attribute is empty, it is considered valid.
	 */
	public $allowEmpty=true;
	/**
	 * @var string the name of the attribute to receive the parsing result.
	 * When this property is not null and the validation is successful, the named attribute will
	 * receive the parsing result.
	 */
	public $timestampAttribute;
	public $operator = '>';
	public $compareAttribute;
	public $compareValue;
	
	/**
	 * 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, $attribute) {
		if ((empty($this->compareAttribute) && empty($this->compareValue)) || empty($this->operator)) {
			$this->addError($attribute, 'Invalid Parameters to dateCompare');
		}
		
		$compareAttribute = $this->compareAttribute;
		$this->compareValue = empty($compareAttribute) ? $this->compareValue : $object->$compareAttribute;;
		
		if ($this->allowEmpty && empty($this->compareValue)) {
			return;
		}

		$start = $object->$attribute;
		Yii::trace('Input value: '.$start. ' -> output timestamp: '.$object->$attribute, 'ccwn.astaf.format');
		$end = $this->compareValue;
		Yii::trace('Input value: '.$end. ' -> output timestamp: '.$this->compareValue, 'ccwn.astaf.format');
		
		//a little php trick - safe than eval and easier than a big switch statement

		if (version_compare($start, $end, $this->operator)) {
			return;
		} else {
			$message = $this->message !== null ? $this->message : Yii::t('astaf', 'The value of {attribute} ({value}) is not {operator} {compareAttribute} ({compareValue}).');
			$this->addError($object, $attribute, $message, array('{operator}'=>$this->operator, '{compareValue}'=>$this->compareValue, '{value}'=>$object->$attribute, '{compareAttribute}'=>($object->getAttributeLabel($this->compareAttribute))));
		}

	}
}