/**
 *	Find Calendar event
 *  convert to ics syntax and open in data: URI
 *
 *	Ben Adida - ben@mit.edu
 *  Dan Connolly - connolly@w3.org
 *  Elias Torres - elias@torrez.us
 *
 *  2006-04-26
 *  2006-05-22 moved to W3
 *
 *	licensed under GPL v2
 */

// EXPECTING __RDFA_BASE
if (typeof(__RDFA_BASE) == 'undefined')
  __RDFA_BASE = 'http://www.w3.org/2001/sw/BestPractices/HTML/rdfa-bookmarklet/';

var __RDFA_VERSION_SUBDIR = '2006-10-08/';

// two simple namespaces as objects
var CAL = new Object();
var RDFA = new Object();

// configuration information
RDFA.url = __RDFA_BASE + __RDFA_VERSION_SUBDIR + 'rdfa.js';

CAL.google_image_src = 'data:image/gif;base64,'+
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CAL.reminder_image_src = 'data:image/png;base64,'+
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    'kBgg5rLZH+fT5dvfn7iFAAAAAElFTkSuQmCC';


// The events
CAL.events = new Array();
CAL.event_els = new Array();
CAL.namespace_uri = 'http://www.w3.org/2002/12/cal/ical#';

CAL.makeGoogleLink = function(el, event) {

    var reminder_link = document.createElement('a');
    reminder_link.title = "Add to Google Calendar"
    reminder_link.href = "http://www.google.com/calendar/event?action=TEMPLATE";

    reminder_link.href += "&text=" + event.summary;
    reminder_link.href += "&dates=" + event.dtstart + "/" + event.dtend;
    reminder_link.href += "&location=" + event.location;

    var reminder_image = document.createElement('img');
    reminder_image.src = CAL.google_image_src;
    reminder_image.border = 0;
    reminder_link.appendChild(reminder_image);
    el.appendChild(reminder_link);
};

CAL.new_triple = function(el,triple) {
    if (triple.predicate.uri() != CAL.namespace_uri + 'dtstart') {
        return;
    }

    CAL.events[CAL.events.length] = triple.subject;
    CAL.event_els[CAL.event_els.length] = el.parentNode;
};

// a function that is called on an element when a triple pertains to it
// with the element being the literal object
RDFA.CALLBACK_NEW_TRIPLE_WITH_LITERAL_OBJECT = function(el, triple) {
    CAL.new_triple(el,triple);
}

// a function that is called on an element when a triple pertains to it
// with the element being the clickable link for a URI object
RDFA.CALLBACK_NEW_TRIPLE_WITH_URI_OBJECT = function(el, triple) {
    CAL.new_triple(el,triple);
}

// a function that is called on an element when a triple pertains to it
// with the element being the subject of the assertions
RDFA.CALLBACK_NEW_TRIPLE_WITH_SUBJECT = function(el, triple) {
    CAL.new_triple(el,triple);
}

// what happens when it's done parsing
RDFA.CALLBACK_DONE_PARSING = function() {
    //alert('okay, done parsing.');
    var cal_ns = new RDFA.Namespace('cal',CAL.namespace_uri);

    for (var i=0; i<CAL.events.length; i++) {
        //alert('going through event ' + i);
        // get dtstart
        var dtstart = RDFA.getTriples(CAL.events[i], new RDFA.CURIE(cal_ns,'dtstart'))[0].object;

        // get duration
        var duration_triples = RDFA.getTriples(CAL.events[i], new RDFA.CURIE(cal_ns, 'duration'));
        var duration = null;
        if (duration_triples)
            duration = duration_triples[0].object;

        // get dtend
        var dtend_triples = RDFA.getTriples(CAL.events[i], new RDFA.CURIE(cal_ns,'dtend'));
        var dtend = null;
        if (dtend_triples)
            dtend = dtend_triples[0].object;

        // default to 1 hour
        if (!duration && !dtend)
            duration = 'PT1H';

        // get summary
        var summary = RDFA.getTriples(CAL.events[i], new RDFA.CURIE(cal_ns,'summary'))[0].object;

        // get location
        var location = RDFA.getTriples(CAL.events[i], new RDFA.CURIE(cal_ns,'location'))[0].object;

        var event = {'dtstart':dtstart , 'duration':duration , 'summary':summary, 'dtend':dtend, 'location':location};

        //alert('about to make links');
        CAL.makeIcalLink(CAL.event_els[i],event);
        CAL.makeGoogleLink(CAL.event_els[i],event);
    }
}

CAL.makeIcalLink = function(el,event) {
        var ical_event = 'BEGIN:VCALENDAR\nVERSION:2.0\nPRODID:RDFa Converter\nBEGIN:VEVENT\nDTSTART:' + event.dtstart + '\nDURATION:' + event.duration + '\nSUMMARY:' + event.summary + '\nLOCATION:' + event.location + '\nEND:VEVENT\nEND:VCALENDAR';
        var ical_event_b64 = btoa(ical_event);
        var ical_uri = 'data:text/calendar;base64,' + ical_event_b64;

        var reminder_link = document.createElement('a');
        reminder_link.title = "Add to iCal"
        reminder_link.href = ical_uri;

        var reminder_image = document.createElement('img');
        reminder_image.src = CAL.reminder_image_src;
        reminder_image.border = 0;
        reminder_link.appendChild(reminder_image);

        el.appendChild(reminder_link);
};

//
// Everything below is used only for loading the RDF/A javascript.
// You probably don't need to look at it.
//

// callback when the RDF/A parsing is done.
RDFA.CALLBACK_DONE_LOADING = function() {
    RDFA.GRDDL.addProfile(__RDFA_BASE + __RDFA_VERSION_SUBDIR + 'hcal-rdfa.js');
    RDFA.parse();
}

RDFA.load = function()
{
    var s = document.createElement("script");
    s.type = 'text/javascript';
    s.src = RDFA.url;

    // add it to the document tree, load it up!
    document.getElementsByTagName('head')[0].appendChild(s);
}

RDFA.load();