##
# 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] );
	}
}


