<?php
/**
 * Copyright 2009-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author   Chuck Hagenbuch <chuck@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/lgpl21 LGPL
 * @package  Date
 */

/**
 * A Span represents a range of time.
 *
 * @author    Chuck Hagenbuch <chuck@horde.org>
 * @category  Horde
 * @copyright 2009-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL
 * @package   Date
 */
class Horde_Date_Span
{
    /**
     * @var Horde_Date
     */
    public $begin;

    /**
     * @var Horde_Date
     */
    public $end;

    /**
     * Constructor.
     *
     * @param mixed $begin  Horde_Date or other format accepted by the
     *                      Horde_Date constructor.
     * @param mixed $end    Horde_Date or other format accepted by the
     *                      Horde_Date constructor.
     */
    public function __construct($begin, $end)
    {
        if (!($begin instanceof Horde_Date)) {
            $begin = new Horde_Date($begin);
        }
        if (!($end instanceof Horde_Date)) {
            $end = new Horde_Date($end);
        }

        $this->begin = $begin;
        $this->end = $end;
    }

    /**
     * Returns the width of this span in seconds.
     */
    public function width()
    {
        return abs($this->end->timestamp() - $this->begin->timestamp());
    }

    /**
     * Is a Horde_Date within this span?
     *
     * @param Horde_Date $date
     */
    public function includes($date)
    {
        return ($this->begin->compareDateTime($date) <= 0) && ($this->end->compareDateTime($date) >= 0);
    }

    /**
     * Add a number of seconds to this span, returning the new span
     */
    public function add($factor)
    {
        return new Horde_Date_Span($this->begin->add($factor), $this->end->add($factor));
    }

    /**
     * Subtract a number of seconds from this span, returning the new span.
     */
    public function sub($factor)
    {
        return new Horde_Date_Span($this->begin->sub($factor), $this->end->sub($factor));
    }

    public function __toString()
    {
        return '(' . $this->begin . '..' . $this->end . ')';
    }

}