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File: Period.php
<?php
# MantisBT - a php based bugtracking system

# MantisBT is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# MantisBT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with MantisBT.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Class for actions dealing with date periods
 *
 * This class encapsulates all actions dealing with time intervals. It handles data
 * storage, and retrieval, as well as formatting and access.
 *
 * @copyright Logical Outcome Ltd. 2005 - 2007
 * @author Glenn Henshaw <thraxisp@logicaloutcome.ca>
 * @link http://www.mantisbt.org
 * @package MantisBT
 * @subpackage classes
 *
 */
class Period {

	/**
	* @var string start date
	*/
	var $start = '';

	/**
	* @var string end date
	*/
	var $end = '';

	// ******* End vars *********************************************
	/**
	* Constructor
	*/
	function Period() {
		$this->start = '';

		// default to today
		$this->end = '';

		// default to today
	}

	/**
	* set dates for a week
	*
	* @param string $p_when date string to expand to a week (Sun to Sat)
	* @param int $p_weeks number of weeks
	*/
	function a_week( $p_when, $p_weeks = 1 ) {
		list( $t_year, $t_month, $t_day ) = explode( "-", $p_when );
		$t_now = getdate( mktime( 0, 0, 0, $t_month, $t_day, $t_year ) );
		$this->end = strftime( "%Y-%m-%d 23:59:59", mktime( 0, 0, 0, $t_month, $t_day - $t_now['wday'] + ( $p_weeks * 7 ) - 1, $t_year ) );
		$this->start = strftime( "%Y-%m-%d 00:00:00", mktime( 0, 0, 0, $t_month, $t_day - $t_now['wday'], $t_year ) );
	}

	/**
	* set dates for this week
	*
	*/
	function this_week() {
		$this->a_week( date( 'Y-m-d' ) );
	}

	/**
	* set dates for last week
	*
	* @param int $p_weeks number of weeks
	*/
	function last_week( $p_weeks = 1 ) {
		$this->a_week( date( 'Y-m-d', strtotime( '-' . $p_weeks . ' week' ) ), $p_weeks );
	}

	/**
	* set dates for this week to date
	*
	*/
	function week_to_date() {
		$this->this_week();
		$this->end = date( 'Y-m-d' ) . ' 23:59:59';
	}

	/**
	* set dates for a month
	*
	* @param string $p_when date string to expand to a month
	*/
	function a_month( $p_when ) {
		list( $t_year, $t_month, $t_day ) = explode( "-", $p_when );
		$this->end = strftime( '%Y-%m-%d 23:59:59', mktime( 0, 0, 0, $t_month + 1, 0, $t_year ) );
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, $t_month, 1, $t_year ) );
	}

	/**
	* set dates for this month
	*
	*/
	function this_month() {
		$this->a_month( date( 'Y-m-d' ) );
	}

	/**
	* set dates for last month
	*
	*/
	function last_month() {
		$this->a_month( date( 'Y-m-d', strtotime( '-1 month' ) ) );
	}

	/**
	* set dates for this month to date
	*
	*/
	function month_to_date() {
		$this->end = date( 'Y-m-d' ) . ' 23:59:59';
		list( $t_year, $t_month, $t_day ) = explode( "-", $this->end );
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, $t_month, 1, $t_year ) );
	}

	/**
	* set dates for a quarter
	*
	* @param string $p_when date string to expand to a quarter
	*/
	function a_quarter( $p_when ) {
		list( $t_year, $t_month, $t_day ) = explode( "-", $p_when );
		$t_month = ( (int)(( $t_month - 1 ) / 3 ) * 3 ) + 1;
		$this->end = strftime( '%Y-%m-%d 23:59:59', mktime( 0, 0, 0, $t_month + 3, 0, $t_year ) );
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, $t_month, 1, $t_year ) );
	}

	/**
	* set dates for this quarter
	*
	*/
	function this_quarter() {
		$this->a_quarter( date( 'Y-m-d' ) );
	}

	/**
	* set dates for last month
	*
	*/
	function last_quarter() {
		$this->a_quarter( date( 'Y-m-d', strtotime( '-3 months' ) ) );
	}

	/**
	* set dates for this quarter to date
	*
	*/
	function quarter_to_date() {
		$this->end = date( 'Y-m-d' ) . ' 23:59:59';
		list( $t_year, $t_month, $t_day ) = explode( '-', $this->end );
		$t_month = ( (int)(( $t_month - 1 ) / 3 ) * 3 ) + 1;
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, $t_month, 1, $t_year ) );
	}

	/**
	* set dates for a year
	*
	* @param string $p_when date string to expand to a year
	*/
	function a_year( $p_when ) {
		list( $t_year, $t_month, $t_day ) = explode( '-', $p_when );
		$this->end = strftime( '%Y-%m-%d 23:59:59', mktime( 0, 0, 0, 12, 31, $t_year ) );
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, 1, 1, $t_year ) );
	}

	/**
	* set dates for this year
	*
	*/
	function this_year() {
		$this->a_year( date( 'Y-m-d' ) );
	}

	/**
	* set dates for current year, ending today
	*
	*/
	function year_to_date() {
		$this->end = date( 'Y-m-d' ) . ' 23:59:59';
		list( $t_year, $t_month, $t_day ) = explode( "-", $this->end );
		$this->start = strftime( '%Y-%m-%d 00:00:00', mktime( 0, 0, 0, 1, 1, $t_year ) );
	}

	/**
	* set dates for last year
	*
	*/
	function last_year() {
		$this->a_year( date( 'Y-m-d', strtotime( '-1 year' ) ) );
	}

	/**
	* get start date in unix timestamp format
	*
	*/
	function get_start_timestamp() {
		return strtotime( $this->start );
	}

	/**
	* get end date in unix timestamp format
	*
	*/
	function get_end_timestamp() {
		return strtotime( $this->end );
	}

	/**
	* get formatted start date
	*
	*/
	function get_start_formatted() {
		return( $this->start == '' ? '' : strftime( '%Y-%m-%d', $this->get_start_timestamp() ) );
	}

	/**
	* get formatted end date
	*
	*/
	function get_end_formatted() {
		return( $this->end == '' ? '' : strftime( '%Y-%m-%d', $this->get_end_timestamp() ) );
	}

	/**
	* get number of days in interval
	*
	*/
	function get_elapsed_days() {
		return( $this->get_end_timestamp() - $this->get_start_timestamp() ) / ( 24 * 60 * 60 );
	}

	/**
	* print a period selector
	*
	* @param string $p_control_name
	*/
	function period_selector( $p_control_name ) {
		$t_periods = array(
			0 => plugin_lang_get( 'period_none' ),
			7 => plugin_lang_get( 'period_this_week' ),
			8 => plugin_lang_get( 'period_last_week' ),
			9 => plugin_lang_get( 'period_two_weeks' ),
			1 => plugin_lang_get( 'period_this_month' ),
			2 => plugin_lang_get( 'period_last_month' ),
			3 => plugin_lang_get( 'period_this_quarter' ),
			4 => plugin_lang_get( 'period_last_quarter' ),
			5 => plugin_lang_get( 'period_year_to_date' ),
			6 => plugin_lang_get( 'period_last_year' ),
			10 => plugin_lang_get( 'period_select' ),
		);
		$t_default = gpc_get_int( $p_control_name, 0 );
		$t_formatted_start = $this->get_start_formatted();
		$t_formatted_end = $this->get_end_formatted();
		$t_ret = '<div id="period_menu">';
		$t_ret .= get_dropdown( $t_periods, $p_control_name, $t_default, false, false, 'setDisplay(\'dates\', document.getElementById(\'' . $p_control_name . '\').value == 10)' );
		$t_ret .= '</div><div id="dates">' . lang_get( 'from_date' ) . '&#160;' . '<input type="text" id="start_date" name="start_date" size="10" value="' . $t_formatted_start . '" />' . '<img src="images/calendar-img.gif" id="f_trigger_s" style="cursor: pointer; border: 1px solid red;" ' . ' title="Date selector" alt="Date" onmouseover="this.style.background=\'red\';"' . ' onmouseout="this.style.background=\'white\'" />' . "\n" . '<br />' . lang_get( 'to_date' ) . '&#160;&#160;&#160;&#160;' . '<input type="text" id="end_date" name="end_date" size="10" value="' . $t_formatted_end . '" />' . '<img src="images/calendar-img.gif" id="f_trigger_e" style="cursor: pointer; border: 1px solid red;" ' . ' alt="Date" title="Date selector" onmouseover="this.style.background=\'red\';"' . ' onmouseout="this.style.background=\'white\'" />' . "\n" . '<script type="text/javascript">
			<!--
			Calendar.setup({ inputField : "start_date", ifFormat : "%Y-%m-%d", button : "f_trigger_s",
			    align : "cR", singleClick : false,  showTime : false });
    		Calendar.setup({ inputField : "end_date", ifFormat : "%Y-%m-%d", button : "f_trigger_e",
    			    align : "cR", singleClick : false,  showTime : false });
    		var t = document.getElementById(\'' . $p_control_name . '\').value;
    		setDisplay(\'' . $p_control_name . '\',true);
    		setDisplay(\'dates\', document.getElementById(\'' . $p_control_name . '\').value == 10);
    			//-->
    		</script>' . "\n" . '</div>';
		return $t_ret;
	}

	/**
	* set date based on period selector
	*
	* @param string $p_control_name
	* @param string $p_start_field
	* @param string $p_end_field
	*/
	function set_period_from_selector( $p_control_name, $p_start_field = 'start_date', $p_end_field = 'end_date' ) {
		$t_default = gpc_get_int( $p_control_name, 0 );
		switch( $t_default ) {
			case 1:
				$this->month_to_date();
				break;
			case 2:
				$this->last_month();
				break;
			case 3:
				$this->quarter_to_date();
				break;
			case 4:
				$this->last_quarter();
				break;
			case 5:
				$this->year_to_date();
				break;
			case 6:
				$this->last_year();
				break;
			case 7:
				$this->week_to_date();
				break;
			case 8:
				$this->last_week();
				break;
			case 9:
				$this->last_week( 2 );
				break;
			case 10:
				$t_today = date( 'Y-m-d' );
				if( $p_start_field != '' ) {
					$this->start = gpc_get_string( $p_start_field, '' ) . ' 00:00:00';
					if( $this->start == '' ) {
						$this->start = $t_today . ' 00:00:00';
					}
				}
				if( $p_end_field != '' ) {
					$this->end = gpc_get_string( $p_end_field, '' ) . ' 23:59:59';
					if( $this->end == '' ) {
						$this->end = $t_today . ' 23:59:59';
					}
				}
				break;
			default:
		}
	}
}