<?php
class Calendar extends PhpObject
{
	const CAL_YEAR = 'cy';
	const CAL_MONTH = 'cm';

	private $oMySql;
	private $oSession;
	private $oMask;

	private $iUserId;
	private $iYear;
	private $iMonth;

	function __construct($oMySql, $oSession)
	{
		parent::__construct();
		$this->oMySql = $oMySql;
		$this->oSession = $oSession;
		$this->oMask = new Mask('calendar');
		$this->iYear = 0;
		$this->iMonth = 0;
	}

	public function setDate($iYear=0, $iMonth=0)
	{
		if($iYear==0)
		{
			$iYear = date('Y');
		}
		if($iMonth==0)
		{
			$iMonth = date('m');
		}
		$this->iYear = $iYear;
		$this->iMonth = $iMonth;
	}

	private function getThoughts()
	{
		//TODO essayer avec selectRows
		$sQuery = "SELECT DATE_FORMAT(led, '%d') AS day
					FROM ".Db::THOUGHTS_TABLE."
					WHERE ".Db::getId(Db::USERS_TABLE)." = ".$this->oSession->getUserId()."
					AND YEAR(led) = ".$this->iYear."
					AND MONTH(led) = ".$this->iMonth."
					GROUP BY day
					ORDER BY day";

		return $this->oMySql->getArrayQuery($sQuery, true);
	}

	private function getUpdatedLink($asParams)
	{
		$sCurrentVariables = $_SERVER['QUERY_STRING'];
		$asCurrentVariables = explode('&', $sCurrentVariables);
		foreach($asCurrentVariables as $sParam)
		{
			$sKey = strstr($sParam, '=', true);
			$sValue = substr(strstr($sParam, '='), 1);
			$asVariables[$sKey] = $sValue;
		}
		return '?'.implodeAll(array_merge($asVariables, $asParams), '=', '&');
	}

	private function getLink($iOffset)
	{
		$iTimeStamp = mktime(0, 0, 0, $this->iMonth + $iOffset, 1, $this->iYear);
		return $this->getUpdatedLink(array(self::CAL_MONTH=>date('n', $iTimeStamp), self::CAL_YEAR=>date('Y', $iTimeStamp)));
	}

	private function setMaskItems()
	{
		//week starting on the sunday : offset = 0, monday : offset = 1
		$iOffset = 1;

		//days in the month
		$iMonthLastDay = date('d', mktime(0, 0, 0, $this->iMonth+1, 0, $this->iYear));
		$asDays = range(1, $iMonthLastDay);

		$iDayNb = 1 - date($iOffset?'N':'w', mktime(0, 0, 0, $this->iMonth, 1, $this->iYear)) + $iOffset;
		$iCalendarLastDay = $iMonthLastDay + (7 - date($iOffset?'N':'w', mktime(0, 0, 0, $this->iMonth+1, 0, $this->iYear))) + $iOffset;

		//days with thoughts
		$asThoughts = $this->getThoughts();

		while($iDayNb < $iCalendarLastDay)
		{
			$iCurrentDayTimeStamp = mktime(0, 0, 0, $this->iMonth, $iDayNb, $this->iYear);
			$sItemDate = date('d', $iCurrentDayTimeStamp);
				
			//new week
			if(date('w', $iCurrentDayTimeStamp) == $iOffset)
			{
				$this->oMask->newInstance('WEEK');
			}
				
			//day within month
			if(date('n', $iCurrentDayTimeStamp)==$this->iMonth)
			{
				$bThoughts = in_array($iDayNb, $asThoughts);

				$sItemClass = $bThoughts?'full':'empty';
				$sItemLink = $bThoughts?$this->getUpdatedLink(array('d'=>date(MyThoughts::URL_DATE_FORMAT, $iCurrentDayTimeStamp), 'p'=>'r')):'#';
				$sItemLinkTitle = $bThoughts?'See my thoughts on '.date(MyThoughts::LAYOUT_DATE_FORMAT, $iCurrentDayTimeStamp):'';
			}
			else
			{
				$sItemClass = 'disabled';
				$sItemLink = '#';
				$sItemLinkTitle = '';
			}
				
			$this->oMask->addInstance('DAY', array('item_day'=>$sItemDate, 'item_class'=>$sItemClass, 'item_link'=>$sItemLink, 'item_link_title'=>$sItemLinkTitle));
			$iDayNb++;
		}

		//column titles
		$asDayNames = array('1'=>'Mon', '2'=>'Tue', '3'=>'Wed', '4'=>'Thu', '5'=>'Fri', '6'=>'Sat', $iOffset?'7':'0'=>'Sun');
		ksort($asDayNames);
		foreach($asDayNames as $sDayName)
		{
			$this->oMask->addInstance('TITLE', array('day_name'=>$sDayName));
		}

	}

	public function getCalendar()
	{
		$sResult = '';
		if($this->iYear!=0 && $this->iMonth!=0)
		{
			$this->oMask->setTag('link_prev', $this->getLink(-1));
			$this->oMask->setTag('current_month', date('F', mktime(0, 0, 0, $this->iMonth, 1, $this->iYear)));
			$this->oMask->setTag('link_next', $this->getLink(1));
			$this->setMaskItems();
			$sResult = $this->oMask->getMask();
		}
		return $sResult;
	}
}
?>