var now   =new Date();
var mycal = CalendarApp.getCalendarById("hlg8igq79s8h34ka583ij2d128@group.calendar.google.com")

evtype = ["V"] // ['V', 'DS', 'C', 'TP', 'TD']
year = [0] // [0,1,2,3] // année en cours

// type are 'V' 'DS' 'C' 'TP' 'TD' for asso, controle, cours, tp, td   
function addEvents(jsonSearch,evtype){
  for( var i = 0; i < jsonSearch.length; i++){
    var eventsg = jsonSearch[i].eventgroups
    for(var m in eventsg) {
      events = eval("eventsg."+m+".events")
      for(var n in events) {
        event = eval("events."+n)
        if( event.shorttype == evtype ){
          var day = event.begin
          var real_start = event.real_start * 15
          var duration = event.duration * 15
          var title = event.title
          var location = event.location
          var author = event.teacher
          var start = new Date(new Date(day).getTime() + real_start*60000)
          var end   = new Date(start.getTime() +duration*60000);
          mycal.createEvent((""+title+"\n"+location+"\n"+author), start, end)
        }
      }
    }
  }
}
  

function strEvent(event){
 return event.getTitle()+event.getStartTime() 
}

function removeDuplicateEvent(){
 var ev = []
 var events = mycal.getEvents(new Date("2015-01-01"), new Date("2022-01-01"))
 for( var i in events){
   event = events[i]
   var s = strEvent(event)
   for( var j in ev ){
     if( ev[j] == s ) {
       Logger.log(s)
       try{event.deleteEvent()}
       catch(err){Logger.log(s)}
     }
   }
   ev.push(s)
 }
}


function updateCal() {
  for ( var i in year ) {
    var y = year[i]
    for( var nweek = 0 ; nweek < 12 ; nweek++ ){
      var url   = "https://www.iiens.net/etudiants/edt.php?year="+y+"&ts="+parseInt((now.getTime()+604800000*nweek)/1000)+"&format=json";
      var jsonData = UrlFetchApp.fetch(url);
      var jsonString = jsonData.getContentText();
      var jsonSearch = JSON.parse(jsonString);
      for (var j in evtype){
        ev = evtype[j]
        addEvents(jsonSearch,ev)
      }
    }
  }
  removeDuplicateEvent()
}