self.importScripts("satellite.js");
self.importScripts("moment.min.js");
self.importScripts("https://cesiumjs.org/releases/1.53/Build/Cesium/Cesium.js")

norad = ""
groundStations = []
satrec = null
Orbits = []
name = ""

onmessage = function(e) {
    norad = e.data[0]
    name = e.data[1][0]
    satrec = self.satellite_js.twoline2satrec(e.data[1][1],e.data[1][2]);
    getStations()
    Orbits = getObrit()
}

setInterval(function(){ 
    getStations()
}, 10000);

setInterval(function(){ 
    getObrit()
}, 60000*5);

setInterval(function(){ 
    
    var gmst = self.satellite_js.gstime(new Date());
    var positionAndVelocity = self.satellite_js.propagate(satrec, new Date());
    var positionEci = positionAndVelocity.position
    var positionGd    = self.satellite_js.eciToGeodetic(positionEci, gmst)
    
    if (groundStations[1] == undefined){
        groundStations.push([])
    }
    
    postMessage([norad,name,self.Cesium.Ellipsoid.WGS84.cartographicToCartesian(new self.Cesium.Cartographic(positionGd.longitude, positionGd.latitude, (positionGd.height*1000))),groundStations[0],groundStations[1],Orbits])
    
    
}, 10000);

function getStations(){
var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
     groundStations = JSON.parse(this.responseText);
    }
  };
  xhttp.open("GET", "/stations_from_sat/"+norad, true);
  xhttp.send();
}

function degress (radians) {
  return radians * 180 / Math.PI;
};


function getObrit(){
        
        satelliteOrbit = []
        for (var i = 0; i < 30; i++){
        time = moment().subtract(10,"m").add(i*1,"m")
        var gmst = self.satellite_js.gstime(new Date(time.valueOf()));
        var positionAndVelocity = self.satellite_js.propagate(satrec, new Date(time.valueOf()));
        var positionEci = positionAndVelocity.position
        var positionGd    = self.satellite_js.eciToGeodetic(positionEci, gmst)

        satelliteOrbit = satelliteOrbit.concat(self.Cesium.Ellipsoid.WGS84.cartographicToCartesian(new self.Cesium.Cartographic(positionGd.longitude, positionGd.latitude, positionGd.height*1000)));
        }
        return satelliteOrbit
        
    }