var mount = {};
var tracking = false;

function mount_slew(direction, state) {
  const rate = document.getElementById("slew_rate").value;
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_slew?direction=" + direction + "&rate=" + rate + "&state=" + state, true);
  xhttp.send();
}
function mount_park() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_park", true);
  xhttp.send();
}
function mount_unpark() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_unpark", true);
  xhttp.send();
}
function mount_connect() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_connect", true);
  xhttp.send();
}
function mount_disconnect() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_disconnect", true);
  xhttp.send();
}
function mount_set_pier_side(pier_side) {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/mount_pier_side?pier_side=" + pier_side , true);
  xhttp.send();
}
function mount_get_messages() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    control = document.getElementById("mount_messages");
    if (this.responseText != "{}") {
      message = JSON.parse(this.responseText);
      text = String(message.message);
      if (text.length > 160) {
        text = text.slice(0, 160) + "...";
      }
      control.innerHTML = "<p>" + text + "</p>"
    }
  }
  xhttp.open("GET", "/mount_messages", true);
  xhttp.send();
}
function mount_get_current_ra_dec() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    mount_ra = document.getElementById("mount_ra");
    mount_dec = document.getElementById("mount_dec");
    mount_alt = document.getElementById("mount_alt");
    mount_az = document.getElementById("mount_az");
    var nf2 = Intl.NumberFormat('en-IN', { minimumIntegerDigits: 2, minimumFractionDigits: 4, maximumFractionDigits: 4 });
    var nf3 = Intl.NumberFormat('en-IN', { minimumIntegerDigits: 3, minimumFractionDigits: 3, maximumFractionDigits: 3 });
    if (this.responseText != "{}") {
      vector = JSON.parse(this.responseText)
      const now = new Date;
      const observer = new Astronomy.Observer(local_observer.latitude, local_observer.longitude, local_observer.altitude);
      var alt = 0;
      var az = 0;
      if (typeof vector.members.RA !== "undefined" && typeof vector.members.DEC !== "undefined") {
        const hor = Astronomy.Horizon(now, observer, parseFloat(vector.members.RA.value), parseFloat(vector.members.DEC.value), 'normal');
        alt = hor.altitude;
        az = hor.azimuth;
      }
      mount.online = vector.online;
      if(vector.online == true) {
        mount_ra.innerHTML = "<p>RA: " + nf2.format(vector.members.RA.value) + "</p>"
        mount_dec.innerHTML = "<p>DEC: " + nf3.format(vector.members.DEC.value) + "</p>"
        mount_alt.innerHTML = "<p>ALT: " + nf2.format(alt) + "</p>"
        mount_az.innerHTML = "<p>AZ: " + nf3.format(az) + "</p>"
        mount.ra = vector.members.RA.value;
        mount.dec = vector.members.DEC.value;
        mount.alt = alt;
        mount.az = az;
      } else {
        mount_ra.innerHTML = "<p>RA:  --.----</p>"
        mount_dec.innerHTML = "<p>DEC: ---.---</p>"
        mount_alt.innerHTML = "<p>ALT:  --.----</p>"
        mount_az.innerHTML = "<p>AZ: ---.---</p>"
        mount.ra = 0;
        mount.dec = 0;
        mount.alt = 0;
        mount.az = 0;
      }
    }
  }
  xhttp.open("GET", "/current_ra_dec", true);
  xhttp.send();
}
function mount_set_track_mode(body) {
  if (body.dataset.body_name == "Moon") {
    mode = "LUNAR";
  } else if (body.dataset.body_name == "Sun") {
    mode = "SOLAR";
  } else {
    mode = "SIDEREAL";
  }
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/track_mode?track_mode=" + mode, true);
  xhttp.send();
}
function mount_goto_body(body) {
  mount_set_track_mode(body);
  window.setTimeout("", 100);
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/goto_ra_dec?ra=" + body.dataset.ra + "&dec=" + body.dataset.dec, true);
  xhttp.send();
}
function mount_random_goto(e) {
  const width = sky_view.offsetWidth;
  const height = sky_view.offsetHeight;
  var alt = -(e.offsetY / height * 180 - 90);
  if (alt == 90){
    alt = 0;
  }
  if (az == 0){
    az = 180;
  }
  var az = e.offsetX / width * 360;
  const now = new Date;
  const observer = new Astronomy.Observer(local_observer.latitude, local_observer.longitude, local_observer.altitude);
  var mercury = Astronomy.Equator("Mercury", now, observer, true, true);
  var matrix = Astronomy.Rotation_HOR_EQD(now, observer);
  var spherical = {lat:alt, lon:az, dist:mercury.dist};
  var in_vector = Astronomy.VectorFromHorizon(spherical, now, "normal");
  var out_vector = Astronomy.RotateVector(matrix, in_vector);
  var equator = Astronomy.EquatorFromVector(out_vector);
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
  }
  xhttp.open("GET", "/goto_ra_dec?ra=" + equator.ra + "&dec=" + equator.dec, true);
  xhttp.send();
}
function mount_get_pier_side() {
  const xhttp = new XMLHttpRequest();
  xhttp.onload = function() {
    document.getElementById("mount_pier_side").innerHTML = "PIER_SIDE: " + this.responseText;
  }
  xhttp.open("GET", "/pier_side", true);
  xhttp.send();
}