<?php

define('SG_ICALREADER_VERSION', '0.7.0');

/**
 * A simple iCal parser. Should take care of most stuff for ya
 * http://github.com/fangel/SG-iCalendar
 *
 * Roadmap:
 *  * Finish FREQUENCY-parsing.
 *  * Add API for recurring events
 *
 * A simple example:
 * <?php
 * $ical = new SG_iCalReader("http://example.com/calendar.ics");
 * foreach( $ical->getEvents() As $event ) {
 *   // Do stuff with the event $event
 * }
 * ?>
 *
 * @package SG_iCalReader
 * @author Morten Fangel (C) 2008
 * @author xonev (C) 2010
 * @author Tanguy Pruvot (C) 2010
 * @license http://creativecommons.org/licenses/by-sa/2.5/dk/deed.en_GB CC-BY-SA-DK
 */
class SG_iCal {

    //objects
    public $information; //SG_iCal_VCalendar
    public $timezones;   //SG_iCal_VTimeZone

    protected $events; //SG_iCal_VEvent[]

    /**
     * Constructs a new iCalReader. You can supply the url now, or later using setUrl
     * @param $url string
     */
    public function __construct($url = false) {
        $this->setUrl($url);
    }

    /**
     * Sets (or resets) the url this reader reads from.
     * @param $url string
     */
    public function setUrl( $url = false ) {
        if( $url !== false ) {
            SG_iCal_Parser::Parse($url, $this);
        }
    }

    /**
     * Returns the main calendar info. You can then query the returned
     * object with ie getTitle().
     * @return SG_iCal_VCalendar
     */
    public function getCalendarInfo() {
        return $this->information;
    }

    /**
     * Sets the calendar info for this calendar
     * @param SG_iCal_VCalendar $info
     */
    public function setCalendarInfo( SG_iCal_VCalendar $info ) {
        $this->information = $info;
    }


    /**
     * Returns a given timezone for the calendar. This is mainly used
     * by VEvents to adjust their date-times if they have specified a
     * timezone.
     *
     * If no timezone is given, all timezones in the calendar is
     * returned.
     *
     * @param $tzid string
     * @return SG_iCal_VTimeZone
     */
    public function getTimeZoneInfo( $tzid = null ) {
        if( $tzid == null ) {
            return $this->timezones;
        } else {
            if ( !isset($this->timezones)) {
                return null;
            }
            foreach( $this->timezones AS $tz ) {
                if( $tz->getTimeZoneId() == $tzid ) {
                    return $tz;
                }
            }
            return null;
        }
    }

    /**
     * Adds a new timezone to this calendar
     * @param SG_iCal_VTimeZone $tz
     */
    public function addTimeZone( SG_iCal_VTimeZone $tz ) {
        $this->timezones[] = $tz;
    }

    /**
     * Returns the events found
     * @return array
     */
    public function getEvents() {
        return $this->events;
    }

    /**
     * Adds a event to this calendar
     * @param SG_iCal_VEvent $event
     */
    public function addEvent( SG_iCal_VEvent $event ) {
        $this->events[] = $event;
    }
}

/**
 * For legacy reasons, we keep the name SG_iCalReader..
 */
class SG_iCalReader extends SG_iCal {}