<?php
/**
 * Piwik - Open source web analytics
 * 
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 * 
 * @category Piwik
 * @package Piwik
 */

/**
 * @package Piwik
 * @subpackage Piwik_Period
 */
class Piwik_Period_Day extends Piwik_Period
{
	protected $label = 'day';

	/**
	 * Returns the day of the period as a string
	 *
	 * @return string
	 */
	public function getPrettyString()
	{
		$out = $this->getDateStart()->toString() ;
		return $out;
	}

	/**
	 * Returns the day of the period as a localized short string
	 *
	 * @return string
	 */
	public function getLocalizedShortString()
	{
		//"Mon 15 Aug"
		$date = $this->getDateStart();
		$out = $date->getLocalized(Piwik_Translate('CoreHome_ShortDateFormat'));
		return $out;
	}

	/**
	 * Returns the day of the period as a localized long string
	 *
	 * @return string
	 */
	public function getLocalizedLongString()
	{
		//"Mon 15 Aug"
		$date = $this->getDateStart();
		$template = Piwik_Translate('CoreHome_DateFormat');
		$out = $date->getLocalized($template);
		return $out;
	}

	/**
	 * Returns the number of subperiods
	 * Always 0, in that case
	 *
	 * @return int
	 */
	public function getNumberOfSubperiods()
	{
		return 0;
	}	

	/**
	 * Adds a subperiod
	 * Not supported for day periods
	 *
	 * @param $date
	 * @throws Exception
	 */
	public function addSubperiod( $date )
	{
		throw new Exception("Adding a subperiod is not supported for Piwik_Period_Day");
	}

	/**
	 * Returns the day of the period in the given format
	 *
	 * @param string $format
	 * @return string
	 */
	public function toString($format = "Y-m-d")
	{
		return $this->date->toString($format);
	}

	/**
	 * Returns the current period as a string
	 *
	 * @return string
	 */
	public function __toString()
	{
		return $this->toString();
	}
}
