##
# storage container for all ND instances
var placement_left = "ND.screenL";
var placement_right = "ND.screenR";
var nd_display = {};

##
# configure aircraft specific cockpit/ND switches here
# these are to be found in the property branch you specify
# via the NavDisplay.new() call
# the backend code in navdisplay.mfd should NEVER contain any aircraft-specific
# properties, or it will break other aircraft using different properties
# instead, make up an identifier (hash key) and map it to the property used
# in your aircraft, relative to your ND root in the backend code, only ever
# refer to the handle/key instead via the me.get_switch('toggle_range') method
# which would internally look up the matching aircraft property, e.g. '/instrumentation/efis'/inputs/range-nm'
#
# note: it is NOT sufficient to just add new switches here, the backend code in navdisplay.mfd also
# needs to know what to do with them !
# refer to incomplete symbol implementations to learn how they work (e.g. WXR, STA)

      var myCockpit_switches = {
    # symbolic alias : relative property (as used in bindings), initial value, type
    'toggle_range':         {path: '/inputs/range-nm', value:40, type:'INT'},
    'toggle_weather':       {path: '/inputs/wxr', value:0, type:'BOOL'},
    'toggle_airports':      {path: '/inputs/arpt', value:0, type:'BOOL'},
    'toggle_stations':      {path: '/inputs/sta', value:0, type:'BOOL'},
    'toggle_waypoints':     {path: '/inputs/wpt', value:0, type:'BOOL'},
    'toggle_position':      {path: '/inputs/pos', value:0, type:'BOOL'},
    'toggle_data':          {path: '/inputs/data',value:0, type:'BOOL'},
    'toggle_terrain':       {path: '/inputs/terr',value:0, type:'BOOL'},
    'toggle_traffic':       {path: '/inputs/tfc',value:0, type:'BOOL'},
    'toggle_centered':      {path: '/inputs/nd-centered',value:0, type:'BOOL'},
    'toggle_lh_vor_adf':    {path: '/inputs/lh-vor-adf',value:0, type:'INT'},
    'toggle_rh_vor_adf':    {path: '/inputs/rh-vor-adf',value:0, type:'INT'},
    'toggle_display_mode':  {path: '/mfd/display-mode', value:'MAP', type:'STRING'},
    'toggle_display_type':  {path: '/mfd/display-type', value:'LCD', type:'STRING'},
    'toggle_true_north':    {path: '/mfd/true-north', value:0, type:'BOOL'},
    'toggle_rangearc':      {path: '/mfd/rangearc', value:0, type:'BOOL'},
    'toggle_track_heading': {path: '/hdg-trk-selected', value:0, type:'BOOL'},
    # add new switches here
      };

###
# entry point, this will set up all ND instances

var _list = setlistener("sim/signals/fdm-initialized", func() {


    # get a handle to the NavDisplay in canvas namespace (for now), see $FG_ROOT/Nasal/canvas/map/navdisplay.mfd
    var ND = canvas.NavDisplay;

    ## TODO: We want to support multiple independent ND instances here!
    # foreach(var pilot; var pilots = [ {name:'cpt', path:'instrumentation/efis',
    #                    name:'fo',  path:'instrumentation[1]/efis']) {


    ##
    # set up a  new ND instance, under 'instrumentation/efis' and use the
    # myCockpit_switches hash to map control properties
    var NDCpt = ND.new("instrumentation/efis", myCockpit_switches);

    nd_display.cpt = canvas.new({
        "name": "ND",
        "size": [1024, 1024],
        "view": [1024, 1024],
        "mipmapping": 1
    });

    nd_display.cpt.addPlacement({"node": placement_left});
    var group = nd_display.cpt.createGroup();
    NDCpt.newMFD(group, nd_display.cpt);
    NDCpt.update();

    var NDFo = ND.new("instrumentation/efis[1]", myCockpit_switches);

    nd_display.fo = canvas.new({
        "name": "ND",
        "size": [1024, 1024],
        "view": [1024, 1024],
        "mipmapping": 1
    });

    nd_display.fo.addPlacement({"node": placement_right});
    var group = nd_display.fo.createGroup();
    NDFo.newMFD(group, nd_display.fo);
    NDFo.update();

    removelistener(_list); # run ONCE
}); # fdm-initialized listener callback


var showNd = func(pilot='cpt') {
    if(getprop("sim/instrument-options/canvas-popup-enable"))
    {
        # The optional second arguments enables creating a window decoration
        var dlg = canvas.Window.new([400, 400], "dialog");
        dlg.setCanvas( nd_display[pilot] );
    }
}