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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Lorenzo Alberton <l dot alberton at quipo dot it>           |
// +----------------------------------------------------------------------+
//
// $Id: PearDate.php,v 1.1 2005-09-30 14:58:00 ddelon Exp $
//
/**
 * @package Calendar
 * @version $Id: PearDate.php,v 1.1 2005-09-30 14:58:00 ddelon Exp $
 */
/**
 * Load PEAR::Date class
 */
require_once 'Date.php';

/**
 * Performs calendar calculations based on the PEAR::Date class
 * Timestamps are in the ISO-8601 format (YYYY-MM-DD HH:MM:SS)
 * @package Calendar
 * @access protected
 */
class Calendar_Engine_PearDate /* implements Calendar_Engine_Interface */
{
    /**
     * Makes sure a given timestamp is only ever parsed once
     * Uses a static variable to prevent date() being used twice
     * for a date which is already known
     * @param mixed Any timestamp format recognized by Pear::Date
     * @return object Pear::Date object
     * @access protected
     */
    function stampCollection($stamp)
    {
        static $stamps = array();
        if (!isset($stamps[$stamp])) {
            $stamps[$stamp] = new Date($stamp);
        }
        return $stamps[$stamp];
    }

    /**
     * Returns a numeric year given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int year (e.g. 2003)
     * @access protected
     */
    function stampToYear($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->year;
    }

    /**
     * Returns a numeric month given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int month (e.g. 9)
     * @access protected
     */
    function stampToMonth($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->month;
    }

    /**
     * Returns a numeric day given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int day (e.g. 15)
     * @access protected
     */
    function stampToDay($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->day;
    }

    /**
     * Returns a numeric hour given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int hour (e.g. 13)
     * @access protected
     */
    function stampToHour($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->hour;
    }

    /**
     * Returns a numeric minute given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int minute (e.g. 34)
     * @access protected
     */
    function stampToMinute($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->minute;
    }

    /**
     * Returns a numeric second given a iso-8601 datetime
     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
     * @return int second (e.g. 51)
     * @access protected
     */
    function stampToSecond($stamp)
    {
        $date = Calendar_Engine_PearDate::stampCollection($stamp);
        return (int)$date->second;
    }

    /**
     * Returns a iso-8601 datetime
     * @param int year (2003)
     * @param int month (9)
     * @param int day (13)
     * @param int hour (13)
     * @param int minute (34)
     * @param int second (53)
     * @return string iso-8601 datetime
     * @access protected
     */
    function dateToStamp($y, $m, $d, $h=0, $i=0, $s=0)
    {
        $r = array();
        Calendar_Engine_PearDate::adjustDate($y, $m, $d, $h, $i, $s);
        $key = $y.$m.$d.$h.$i.$s;
        if (!isset($r[$key])) {
            $r[$key] = sprintf("%04d-%02d-%02d %02d:%02d:%02d",
                                $y, $m, $d, $h, $i, $s);
        }
        return $r[$key];
    }

    /**
     * Set the correct date values (useful for math operations on dates)
     * @param int year   (2003)
     * @param int month  (9)
     * @param int day    (13)
     * @param int hour   (13)
     * @param int minute (34)
     * @param int second (53)
     * @access protected
     */
    function adjustDate(&$y, &$m, &$d, &$h, &$i, &$s)
    {
        if ($s < 0) {
            $m -= floor($s / 60);
            $s = -$s % 60;
        }
        if ($s > 60) {
            $m += floor($s / 60);
            $s %= 60;
        }
        if ($i < 0) {
            $h -= floor($i / 60);
            $i = -$i % 60;
        }
        if ($i > 60) {
            $h += floor($i / 60);
            $i %= 60;
        }
        if ($h < 0) {
            $d -= floor($h / 24);
            $h = -$h % 24;
        }
        if ($h > 24) {
            $d += floor($h / 24);
            $h %= 24;
        }
        for(; $m < 1; $y--, $m+=12);
        for(; $m > 12; $y++, $m-=12);

        while ($d < 1) {
            if ($m > 1) {
                $m--;
            } else {
                $m = 12;
                $y--;
            }
            $d += Date_Calc::daysInMonth($m, $y);
        }
        for ($max_days = Date_Calc::daysInMonth($m, $y); $d > $max_days; ) {
            $d -= $max_days;
            if ($m < 12) {
                $m++;
            } else {
                $m = 1;
                $y++;
            }
        }
    }

    /**
     * The upper limit on years that the Calendar Engine can work with
     * @return int 9999
     * @access protected
     */
    function getMaxYears()
    {
        return 9999;
    }

    /**
     * The lower limit on years that the Calendar Engine can work with
     * @return int 0
     * @access protected
     */
    function getMinYears()
    {
        return 0;
    }

    /**
     * Returns the number of months in a year
     * @return int (12)
     * @access protected
     */
    function getMonthsInYear($y=null)
    {
        return 12;
    }

    /**
     * Returns the number of days in a month, given year and month
     * @param int year (2003)
     * @param int month (9)
     * @return int days in month
     * @access protected
     */
    function getDaysInMonth($y, $m)
    {
        return (int)Date_Calc::daysInMonth($m, $y);
    }

    /**
     * Returns numeric representation of the day of the week in a month,
     * given year and month
     * @param int year (2003)
     * @param int month (9)
     * @return int from 0 to 7
     * @access protected
     */
    function getFirstDayInMonth($y, $m)
    {
        return (int)Date_Calc::dayOfWeek(1, $m, $y);
    }

    /**
     * Returns the number of days in a week
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @return int (7)
     * @access protected
     */
    function getDaysInWeek($y=NULL, $m=NULL, $d=NULL)
    {
        return 7;
    }

    /**
     * Returns the number of the week in the year (ISO-8601), given a date
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @return int week number
     * @access protected
     */
    function getWeekNInYear($y, $m, $d)
    {
        return Date_Calc::weekOfYear($d, $m, $y); //beware, Date_Calc doesn't follow ISO-8601 standard!
    }

    /**
     * Returns the number of the week in the month, given a date
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @param int first day of the week (default: monday)
     * @return int week number
     * @access protected
     */
    function getWeekNInMonth($y, $m, $d, $firstDay=1)
    {
        $weekEnd = ($firstDay == 0) ? $this->getDaysInWeek()-1 : $firstDay-1;
        $end_of_week = (int)Date_Calc::nextDayOfWeek($weekEnd, 1, $m, $y, '%e', true);
        $w = 1;
        while ($d > $end_of_week) {
           ++$w;
            $end_of_week += $this->getDaysInWeek();
        }
        return $w;
    }

    /**
     * Returns the number of weeks in the month
     * @param int year (2003)
     * @param int month (9)
     * @param int first day of the week (default: monday)
     * @return int weeks number
     * @access protected
     */
    function getWeeksInMonth($y, $m, $firstDay=1)
    {
        $FDOM = Date_Calc::firstOfMonthWeekday($m, $y);

        if ($FDOM > $firstDay) {
            $firstWeekDays = $this->getDaysInWeek() - $FDOM + $firstDay;
            $weeks = 1;
        } else {
            $firstWeekDays = $firstDay - $FDOM;
            $weeks = 0;
        }
        
        $firstWeekDays %= $this->getDaysInWeek();
        
        $result = (int)(ceil(($this->getDaysInMonth($y, $m) - $firstWeekDays) /
                           $this->getDaysInWeek()) + $weeks);

        if ( $FDOM != 0 ) {
            return $result;
        } else {
            return $result + 1;
        }
    }

    /**
     * Returns the number of the day of the week (0=sunday, 1=monday...)
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @return int weekday number
     * @access protected
     */
    function getDayOfWeek($y, $m, $d)
    {
        return Date_Calc::dayOfWeek($d, $m, $y);
    }

    /**
     * Returns a list of integer days of the week beginning 0
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @return array (0, 1, 2, 3, 4, 5, 6) 1 = Monday
     * @access protected
     */
    function getWeekDays($y=NULL, $m=NULL, $d=NULL)
    {
        return array(0, 1, 2, 3, 4, 5, 6);
    }

   /**
     * Returns the default first day of the week
     * @param int year (2003)
     * @param int month (9)
     * @param int day (4)
     * @return int (default 1 = Monday)
     * @access protected
     */
    function getFirstDayOfWeek($y=NULL, $m=NULL, $d=NULL)
    {
        return 1;
    }

    /**
     * Returns the number of hours in a day
     * @return int (24)
     * @access protected
     */
    function getHoursInDay($y=null,$m=null,$d=null)
    {
        return 24;
    }

    /**
     * Returns the number of minutes in an hour
     * @return int (60)
     * @access protected
     */
    function getMinutesInHour($y=null,$m=null,$d=null,$h=null)
    {
        return 60;
    }

    /**
     * Returns the number of seconds in a minutes
     * @return int (60)
     * @access protected
     */
    function getSecondsInMinute($y=null,$m=null,$d=null,$h=null,$i=null)
    {
        return 60;
    }
}
?>