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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: Harry Fuecks <hfuecks@phppatterns.com>                      |

// |          Lorenzo Alberton <l dot alberton at quipo dot it>           |

// +----------------------------------------------------------------------+

//

// $Id: Calendar.php,v 1.3 2005/10/22 10:07:11 quipo Exp $

//

/**

 * @package Calendar

 * @version $Id: Calendar.php,v 1.3 2005/10/22 10:07:11 quipo Exp $

 */

/**

 * Allows Calendar include path to be redefined

 */

if (!defined('CALENDAR_ROOT')) {

    define('CALENDAR_ROOT', 'Calendar'.DIRECTORY_SEPARATOR);

}

/**

 * Constant which defines the calculation engine to use

 */

if (!defined('CALENDAR_ENGINE')) {

    define('CALENDAR_ENGINE', 'UnixTS');

}

/**

 * Define Calendar Month states

 */

define('CALENDAR_USE_MONTH',          1);

define('CALENDAR_USE_MONTH_WEEKDAYS', 2);

define('CALENDAR_USE_MONTH_WEEKS',    3);

/**

 * Contains a factory method to return a Singleton instance of a class

 * implementing the Calendar_Engine_Interface.<br>

 * <b>Note:</b> this class must be modified to "register" alternative

 * Calendar_Engines. The engine used can be controlled with the constant

 * CALENDAR_ENGINE

 * @see Calendar_Engine_Interface

 * @package Calendar

 * @access protected

 */

class Calendar_Engine_Factory

{

    /**

     * Returns an instance of the engine

     * @return object instance of a calendar calculation engine

     * @access protected

     */

    function & getEngine()

    {

        static $engine = false;

        switch (CALENDAR_ENGINE) {

            case 'PearDate':

                $class = 'Calendar_Engine_PearDate';

                break;

            case 'UnixTS':

            default:

                $class = 'Calendar_Engine_UnixTS';

            break;

        }

        if (!$engine) {

            if (!class_exists($class)) {

                require_once CALENDAR_ROOT.'Engine'.DIRECTORY_SEPARATOR.CALENDAR_ENGINE.'.php';

            }

            $engine = new $class;

        }

        return $engine;

    }

}

/**

 * Base class for Calendar API. This class should not be instantiated

 * directly.

 * @abstract

 * @package Calendar

 */

class Calendar

{

    /**

     * Instance of class implementing calendar engine interface

     * @var object

     * @access private

     */

    var $cE;

    /**

     * Instance of Calendar_Validator (lazy initialized when isValid() or

     * getValidor() is called

     * @var Calendar_Validator

     * @access private

     */

    var $validator;

    /**

     * Year for this calendar object e.g. 2003

     * @access private

     * @var int

     */

   var $year;

    /**

     * Month for this calendar object e.g. 9

     * @access private

     * @var int

     */

    var $month;

    /**

     * Day of month for this calendar object e.g. 23

     * @access private

     * @var int

     */

    var $day;

    /**

     * Hour of day for this calendar object e.g. 13

     * @access private

     * @var int

     */

    var $hour;

    /**

     * Minute of hour this calendar object e.g. 46

     * @access private

     * @var int

     */

    var $minute;

    /**

     * Second of minute this calendar object e.g. 34

     * @access private

     * @var int

     */

    var $second;

    /**

     * Marks this calendar object as selected (e.g. 'today')

     * @access private

     * @var boolean

     */

    var $selected = false;

    /**

     * Collection of child calendar objects created from subclasses

     * of Calendar. Type depends on the object which created them.

     * @access private

     * @var array

     */

    var $children = array();

    /**

     * Constructs the Calendar

     * @param int year

     * @param int month

     * @param int day

     * @param int hour

     * @param int minute

     * @param int second

     * @access protected

     */

    function Calendar($y = 2000, $m = 1, $d = 1, $h = 0, $i = 0, $s = 0)

    {

        static $cE = null;

        if (!isset($cE)) {

            $cE = & Calendar_Engine_Factory::getEngine();

        }

        $this->cE = & $cE;

        $this->year   = (int)$y;

        $this->month  = (int)$m;

        $this->day    = (int)$d;

        $this->hour   = (int)$h;

        $this->minute = (int)$i;

        $this->second = (int)$s;

    }

    /**

     * Defines the calendar by a timestamp (Unix or ISO-8601), replacing values

     * passed to the constructor

     * @param int|string Unix or ISO-8601 timestamp

     * @return void

     * @access public

     */

    function setTimestamp($ts)

    {

        $this->year   = $this->cE->stampToYear($ts);

        $this->month  = $this->cE->stampToMonth($ts);

        $this->day    = $this->cE->stampToDay($ts);

        $this->hour   = $this->cE->stampToHour($ts);

        $this->minute = $this->cE->stampToMinute($ts);

        $this->second = $this->cE->stampToSecond($ts);

    }

    /**

     * Returns a timestamp from the current date / time values. Format of

     * timestamp depends on Calendar_Engine implementation being used

     * @return int|string timestamp

     * @access public

     */

    function getTimestamp()

    {

        return $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute, $this->second);

    }

    /**

     * Defines calendar object as selected (e.g. for today)

     * @param boolean state whether Calendar subclass

     * @return void

     * @access public

     */

    function setSelected($state = true)

    {

        $this->selected = $state;

    }

    /**

     * True if the calendar subclass object is selected (e.g. today)

     * @return boolean

     * @access public

     */

    function isSelected()

    {

        return $this->selected;

    }

    /**

     * Adjusts the date (helper method)

     * @return void

     * @access public

     */

    function adjust()

    {

        $stamp = $this->getTimeStamp();

        $this->year   = $this->cE->stampToYear($stamp);

        $this->month  = $this->cE->stampToMonth($stamp);

        $this->day    = $this->cE->stampToDay($stamp);

        $this->hour   = $this->cE->stampToHour($stamp);

        $this->minute = $this->cE->stampToMinute($stamp);

        $this->second = $this->cE->stampToSecond($stamp);

    }

    /**

     * Returns the date as an associative array (helper method)

     * @param mixed timestamp (leave empty for current timestamp)

     * @return array

     * @access public

     */

    function toArray($stamp=null)

    {

        if (is_null($stamp)) {

            $stamp = $this->getTimeStamp();

        }

        return array(

            'year'   => $this->cE->stampToYear($stamp),

            'month'  => $this->cE->stampToMonth($stamp),

            'day'    => $this->cE->stampToDay($stamp),

            'hour'   => $this->cE->stampToHour($stamp),

            'minute' => $this->cE->stampToMinute($stamp),

            'second' => $this->cE->stampToSecond($stamp)

        );

    }

    /**

     * Returns the value as an associative array (helper method)

     * @param string type of date object that return value represents

     * @param string $format ['int' | 'array' | 'timestamp' | 'object']

     * @param mixed timestamp (depending on Calendar engine being used)

     * @param int integer default value (i.e. give me the answer quick)

     * @return mixed

     * @access private

     */

    function returnValue($returnType, $format, $stamp, $default)

    {

        switch (strtolower($format)) {

            case 'int':

                return $default;

            case 'array':

                return $this->toArray($stamp);

                break;

            case 'object':

                require_once CALENDAR_ROOT.'Factory.php';

                return Calendar_Factory::createByTimestamp($returnType,$stamp);

                break;

            case 'timestamp':

            default:

                return $stamp;

                break;

        }

    }

    /**

     * Abstract method for building the children of a calendar object.

     * Implemented by Calendar subclasses

     * @param array containing Calendar objects to select (optional)

     * @return boolean

     * @access public

     * @abstract

     */

    function build($sDates = array())

    {

        require_once 'PEAR.php';

        PEAR::raiseError(

            'Calendar::build is abstract', null, PEAR_ERROR_TRIGGER,

            E_USER_NOTICE, 'Calendar::build()');

        return false;

    }

    /**

     * Abstract method for selected data objects called from build

     * @param array

     * @return boolean

     * @access public

     * @abstract

     */

    function setSelection($sDates)

    {

        require_once 'PEAR.php';

        PEAR::raiseError(

            'Calendar::setSelection is abstract', null, PEAR_ERROR_TRIGGER,

            E_USER_NOTICE, 'Calendar::setSelection()');

        return false;

    }

    /**

     * Iterator method for fetching child Calendar subclass objects

     * (e.g. a minute from an hour object). On reaching the end of

     * the collection, returns false and resets the collection for

     * further iteratations.

     * @return mixed either an object subclass of Calendar or false

     * @access public

     */

    function fetch()

    {

        $child = each($this->children);

        if ($child) {

            return $child['value'];

        } else {

            reset($this->children);

            return false;

        }

    }

    /**

     * Fetches all child from the current collection of children

     * @return array

     * @access public

     */

    function fetchAll()

    {

        return $this->children;

    }

    /**

     * Get the number Calendar subclass objects stored in the internal

     * collection.

     * @return int

     * @access public

     */

    function size()

    {

        return count($this->children);

    }

    /**

     * Determine whether this date is valid, with the bounds determined by

     * the Calendar_Engine. The call is passed on to

     * Calendar_Validator::isValid

     * @return boolean

     * @access public

     */

    function isValid()

    {

        $validator = & $this->getValidator();

        return $validator->isValid();

    }

    /**

     * Returns an instance of Calendar_Validator

     * @return Calendar_Validator

     * @access public

     */

    function & getValidator()

    {

        if (!isset($this->validator)) {

            require_once CALENDAR_ROOT.'Validator.php';

            $this->validator = & new Calendar_Validator($this);

        }

        return $this->validator;

    }

    /**

     * Returns a reference to the current Calendar_Engine being used. Useful

     * for Calendar_Table_Helper and Calendar_Validator

     * @return object implementing Calendar_Engine_Inteface

     * @access protected

     */

    function & getEngine()

    {

        return $this->cE;

    }

    /**

     * Set the CALENDAR_FIRST_DAY_OF_WEEK constant to the $firstDay value

     * if the constant is not set yet.

     * @throws E_USER_WARNING this method throws a WARNING if the

     *    CALENDAR_FIRST_DAY_OF_WEEK constant is already defined and

     *    the $firstDay parameter is set to a different value

     * @param integer $firstDay first day of the week (0=sunday, 1=monday, ...)

     * @return integer

     * @access protected

     */

    function defineFirstDayOfWeek($firstDay = null)

    {

        if (defined('CALENDAR_FIRST_DAY_OF_WEEK')) {

            if (!is_null($firstDay) && ($firstDay != CALENDAR_FIRST_DAY_OF_WEEK)) {

                $msg = 'CALENDAR_FIRST_DAY_OF_WEEK constant already defined.'

                  .' The $firstDay parameter will be ignored.';

                trigger_error($msg, E_USER_WARNING);

            }

            return CALENDAR_FIRST_DAY_OF_WEEK;

        }

        if (is_null($firstDay)) {

            $firstDay = $this->cE->getFirstDayOfWeek(

                $this->thisYear(),

                $this->thisMonth(),

                $this->thisDay()

            );

        }

        define ('CALENDAR_FIRST_DAY_OF_WEEK', $firstDay);

        return CALENDAR_FIRST_DAY_OF_WEEK;

    }

    /**

     * Returns the value for the previous year

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 2002 or timestamp

     * @access public

     */

    function prevYear($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year-1, 1, 1, 0, 0, 0);

        return $this->returnValue('Year', $format, $ts, $this->year-1);

    }

    /**

     * Returns the value for this year

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 2003 or timestamp

     * @access public

     */

    function thisYear($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year, 1, 1, 0, 0, 0);

        return $this->returnValue('Year', $format, $ts, $this->year);

    }

    /**

     * Returns the value for next year

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 2004 or timestamp

     * @access public

     */

    function nextYear($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year+1, 1, 1, 0, 0, 0);

        return $this->returnValue('Year', $format, $ts, $this->year+1);

    }

    /**

     * Returns the value for the previous month

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 4 or Unix timestamp

     * @access public

     */

    function prevMonth($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year, $this->month-1, 1, 0, 0, 0);

        return $this->returnValue('Month', $format, $ts, $this->cE->stampToMonth($ts));

    }

    /**

     * Returns the value for this month

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 5 or timestamp

     * @access public

     */

    function thisMonth($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year, $this->month, 1, 0, 0, 0);

        return $this->returnValue('Month', $format, $ts, $this->month);

    }

    /**

     * Returns the value for next month

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 6 or timestamp

     * @access public

     */

    function nextMonth($format = 'int')

    {

        $ts = $this->cE->dateToStamp($this->year, $this->month+1, 1, 0, 0, 0);

        return $this->returnValue('Month', $format, $ts, $this->cE->stampToMonth($ts));

    }

    /**

     * Returns the value for the previous day

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 10 or timestamp

     * @access public

     */

    function prevDay($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day-1, 0, 0, 0);

        return $this->returnValue('Day', $format, $ts, $this->cE->stampToDay($ts));

    }

    /**

     * Returns the value for this day

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 11 or timestamp

     * @access public

     */

    function thisDay($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day, 0, 0, 0);

        return $this->returnValue('Day', $format, $ts, $this->day);

    }

    /**

     * Returns the value for the next day

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 12 or timestamp

     * @access public

     */

    function nextDay($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day+1, 0, 0, 0);

        return $this->returnValue('Day', $format, $ts, $this->cE->stampToDay($ts));

    }

    /**

     * Returns the value for the previous hour

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 13 or timestamp

     * @access public

     */

    function prevHour($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day, $this->hour-1, 0, 0);

        return $this->returnValue('Hour', $format, $ts, $this->cE->stampToHour($ts));

    }

    /**

     * Returns the value for this hour

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 14 or timestamp

     * @access public

     */

    function thisHour($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day, $this->hour, 0, 0);

        return $this->returnValue('Hour', $format, $ts, $this->hour);

    }

    /**

     * Returns the value for the next hour

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 14 or timestamp

     * @access public

     */

    function nextHour($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day, $this->hour+1, 0, 0);

        return $this->returnValue('Hour', $format, $ts, $this->cE->stampToHour($ts));

    }

    /**

     * Returns the value for the previous minute

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 23 or timestamp

     * @access public

     */

    function prevMinute($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute-1, 0);

        return $this->returnValue('Minute', $format, $ts, $this->cE->stampToMinute($ts));

    }

    /**

     * Returns the value for this minute

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 24 or timestamp

     * @access public

     */

    function thisMinute($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute, 0);

        return $this->returnValue('Minute', $format, $ts, $this->minute);

    }

    /**

    * Returns the value for the next minute

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 25 or timestamp

     * @access public

     */

    function nextMinute($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute+1, 0);

        return $this->returnValue('Minute', $format, $ts, $this->cE->stampToMinute($ts));

    }

    /**

     * Returns the value for the previous second

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 43 or timestamp

     * @access public

     */

    function prevSecond($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute, $this->second-1);

        return $this->returnValue('Second', $format, $ts, $this->cE->stampToSecond($ts));

    }

    /**

     * Returns the value for this second

    * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 44 or timestamp

     * @access public

     */

    function thisSecond($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute, $this->second);

        return $this->returnValue('Second', $format, $ts, $this->second);

    }

    /**

     * Returns the value for the next second

     * @param string return value format ['int' | 'timestamp' | 'object' | 'array']

     * @return int e.g. 45 or timestamp

     * @access public

     */

    function nextSecond($format = 'int')

    {

        $ts = $this->cE->dateToStamp(

            $this->year, $this->month, $this->day,

            $this->hour, $this->minute, $this->second+1);

        return $this->returnValue('Second', $format, $ts, $this->cE->stampToSecond($ts));

    }

}

?>