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<?php
/**
 * EDateFormatBehavior.php
 *
 * @author: antonio ramirez <amigo.cobos@gmail.com>
 */
class EDateFormatBehavior extends CActiveRecordBehavior
{
	//.. array of columns that have dates to be converted
	public $dateColumns = array();
	public $dateTimeColumns = array();

	public $dateFormat = 'd/m/Y';
	public $dateTimeFormat = 'd/m/Y H:i:s';

	/**
	 * Convert from $dateFormat to UNIX timestamp dates before saving
	 */
	public function beforeSave($event)
	{
		$this->format($this->dateColumns, $this->dateFormat);
		$this->format($this->dateTimeColumns, $this->dateTimeFormat);
		return parent::beforeSave($event);
	}

	/**
	 * After saving, rollback state of the columns
	 * @param CModelEvent $event
	 */
	public function afterSave($event)
	{
		$this->format($this->dateColumns, $this->dateFormat, false);
		$this->format($this->dateTimeColumns, $this->dateTimeFormat, false);
		return parent::afterSave($event);
	}

	/**
	 * Converts UNIX timestamp dates to $dateFormat after read from database
	 */
	public function afterFind($event)
	{
		$this->format($this->dateColumns, $this->dateFormat, false);
		$this->format($this->dateTimeColumns, $this->dateTimeFormat, false);
		return parent::afterFind($event);
	}

	/**
	 *
	 * Formats to UNIX timestamp or $dateFormat as specified. Note that
	 * if using $dateFormat then assumed timestamp value
	 * @param array $columns the columns attributes to format
	 * @param string $format the format to convert the date to
	 * @param boolean $strtotime if boolean, will convert to UNIX timestamp
	 * @return void
	 */
	protected function format($columns, $format, $strtotime = true)
	{
		if (empty($columns)) return;

		foreach ($this->getOwner()->getAttributes() as $key => $value)
		{
			if (in_array($key, $columns) && !empty($value))
			{

				$dt = $this->getOwner()->{$key};
				$this->getOwner()->{$key} = $strtotime ? strtotime($dt, time()) : date($format, $dt);
			}
		}
	}
}