# NearestAirports Controller
var NearestAirportsController =
{
  UIGROUP : {
    NONE : 0, # No group currently selected,
    APT  : 1,
    RNWY : 2,
    FREQ : 3,
    APR  : 4,
  },

  new : func (page, svg)
  {
    var obj = { parents : [ NearestAirportsController ] };

    # Current active UI group.
    obj.page = page;
    obj._currentGroup = NearestAirportsController.UIGROUP.NONE;
    obj._crsrToggle = 0;

    # Emesary
    obj._recipient = nil;

    return obj;
  },

  getAirports : func() {
    # Find the airports within 200nm and display them.

    # To make this more efficient for areas with a high density of airports, we'll try
    # small radii first.

    var radius = 0;
    var apts = [];

    while ((radius <= 200) and (size(apts) < 25)) {
      radius = radius + 50;
      apts = findAirportsWithinRange(radius);
    }

    if (size(apts) > 25) {
      apts = subvec(apts, 0, 25);
    }
    me.page.updateAirports(apts);
  },
  selectAirports : func() {
    me.selectGroup(NearestAirportsController.UIGROUP.APT)
  },
  selectRunways : func() {
    me.selectGroup(NearestAirportsController.UIGROUP.RNWY);
  },
  selectFrequencies : func() {
    me.selectGroup(NearestAirportsController.UIGROUP.FREQ);
  },
  selectApproaches : func() {
    me.selectGroup(NearestAirportsController.UIGROUP.APR);
  },
  getSelectedGroup : func() {
    return me._currentGroup;
  },
  selectGroup : func(grp) {
    me._currentGroup = grp;
    # The current Airport is always highlighted - we're either changing it directly,
    # or viewing the selected airport.
    if (grp == NearestAirportsController.UIGROUP.RNWY) me.page.runwaySelect.highlightElement()   else me.page.runwaySelect.unhighlightElement();
    if (grp == NearestAirportsController.UIGROUP.FREQ) me.page.freqSelect.showCRSR()     else me.page.freqSelect.hideCRSR();
    if (grp == NearestAirportsController.UIGROUP.APR)  me.page.approachSelect.showCRSR() else me.page.approachSelect.hideCRSR();
    me._crsrToggle = 1;
  },

  # Input Handling
  handleCRSR : func() {
    me._crsrToggle = (! me._crsrToggle);
    if (me._crsrToggle) {
      me.page.selectAirports();
      me.selectAirports();
    } else {
      # Hide the cursor and reset any highlighting
      me.page.resetCRSR();
    }
    return emesary.Transmitter.ReceiptStatus_Finished;
  },
  handleFMSInner : func(value) {
    if (me._crsrToggle == 1) {
      # Scroll through whatever is the current list

      if (me._currentGroup == NearestAirportsController.UIGROUP.APT) {
        me.page.airportSelect.incrSmall(value);
        var apt_id = me.page.getSelectedAirportID();
        var apt_info = airportinfo(apt_id);
        me.page.updateAirportData(apt_info);
      }

      if (me._currentGroup == NearestAirportsController.UIGROUP.RNWY) {
        me.page.runwaySelect.incrSmall(value);
        # Need to manually update the runway information
        var apt_id = me.page.airportSelect.getValue();
        var rwy    = me.page.runwaySelect.getValue();

        if ((rwy != nil) and (rwy != "")) {
          var apt_info = airportinfo(apt_id);
          var rwy_info = apt_info.runways[rwy];
          me.page.updateRunwayInfo(rwy_info);
        }
      }

      if (me._currentGroup == NearestAirportsController.UIGROUP.FREQ) me.page.freqSelect.incrSmall(value);
      if (me._currentGroup == NearestAirportsController.UIGROUP.APR)  me.page.approachSelect.incrSmall(value);

      return emesary.Transmitter.ReceiptStatus_Finished;
    } else {
      return me.page.mfd._pageGroupController.handleFMSInner(value);
    }
  },
  handleFMSOuter : func(value) {
    if (me._crsrToggle == 1) {

      # The large knob only affects the Airport selection in cursor mode.
      # Question-mark over whether it does this when other groups
      # are selected.  Assumption now is that it doesn't - otherwise it would
      # be too easy to nudge it while trying to scroll through runways/approaches etc.

      if (me._currentGroup == NearestAirportsController.UIGROUP.APT) {
        me.page.airportSelect.incrLarge(value);
        var apt_id = me.page.getSelectedAirportID();
        var apt_info = airportinfo(apt_id);
        me.page.updateAirportData(apt_info);
      }

      return emesary.Transmitter.ReceiptStatus_Finished;
    } else {
      return me.page.mfd._pageGroupController.handleFMSOuter(value);
    }
  },
  handleEnter : func(value) {
    if (me._crsrToggle == 1) {
      if (me._currentGroup == NearestAirportsController.UIGROUP.APT) {
        # If the airport group is selected, the ENT key selects the next airport
        me.page.airportSelect.incrLarge(value);
        var apt_id = me.page.getSelectedAirportID();
        var apt_info = airportinfo(apt_id);
        me.page.updateAirportData(apt_info);
      }

      if (me._currentGroup == NearestAirportsController.UIGROUP.RNWY) {
        # No effect if runways are selected
      }

      if (me._currentGroup == NearestAirportsController.UIGROUP.FREQ) {
        # TODO Select the current COM frequency.
        var freq = me.page.getSelectedFreq();
        if (freq != nil) print("NearestAirportController.handleEnter frequency selection " ~ freq);
      }

      if (me._currentGroup == NearestAirportsController.UIGROUP.APR) {
        # TODO Select the current Approach
        var appr = me.page.getSelectedApproach();
        if (appr != nil) print("NearestAirportController.handleEnter Approach selection " ~ appr);
      }
    } else {
      return emesary.Transmitter.ReceiptStatus_NotProcessed;
    }
  },
  RegisterWithEmesary : func(transmitter = nil){
    if (transmitter == nil)
      transmitter = emesary.GlobalTransmitter;

    if (me._recipient == nil){
      me._recipient = emesary.Recipient.new("AirportInfoController_" ~ me.page.device.designation);
      var pfd_obj = me.page.device;
      var controller = me;
      me._recipient.Receive = func(notification)
      {
        if (notification.Device_Id == pfd_obj.device_id
            and notification.NotificationType == notifications.PFDEventNotification.DefaultType) {
          if (notification.Event_Id == notifications.PFDEventNotification.HardKeyPushed
              and notification.EventParameter != nil)
          {
            var id = notification.EventParameter.Id;
            var value = notification.EventParameter.Value;
            #printf("Button pressed " ~ id ~ " " ~ value);
            if (id == fg1000.FASCIA.FMS_CRSR)   return controller.handleCRSR();
            if (id == fg1000.FASCIA.FMS_OUTER)  return controller.handleFMSOuter(value);
            if (id == fg1000.FASCIA.FMS_INNER)  return controller.handleFMSInner(value);
            if (id == fg1000.FASCIA.ENT)        return controller.handleEnter(value);
          }
        }
        return emesary.Transmitter.ReceiptStatus_NotProcessed;
      };
    }
    transmitter.Register(me._recipient);
    me.transmitter = transmitter;
  },
  DeRegisterWithEmesary : func(transmitter = nil){
      # remove registration from transmitter; but keep the recipient once it is created.
      if (me.transmitter != nil)
        me.transmitter.DeRegister(me._recipient);
      me.transmitter = nil;
  },

  # Reset controller if required when the page is displayed or hidden
  ondisplay : func() {
    me._currentGroup = NearestAirportsController.UIGROUP.NONE;
    me.RegisterWithEmesary();
    me.getAirports();
  },
  offdisplay : func() {
    me.DeRegisterWithEmesary();
  },
};