var PFD = nil;

var MFD = nil;

# les listeners triggent en permanence sur les fréquences...

var setListeners = func {

    setlistener('/instrumentation/nav/nav-id',

            func (n) {

                var val = n.getValue();

                if (PFD != nil)

                    PFD.display.updateNAV({'nav-id': 1, val: val});

                if (MFD != nil)

                    MFD.display.updateNAV({'nav-id': 1, val: val});

            }, 1, 2);

    setlistener('/instrumentation/nav[1]/nav-id',

            func (n) {

                var val = n.getValue();

                if (PFD != nil)

                    PFD.display.updateNAV({'nav-id': 2, val: val});

                if (MFD != nil)

                    MFD.display.updateNAV({'nav-id': 2, val: val});

            }, 1, 2);

    setlistener('/instrumentation/zkv1000/radios/nav-tune',

            func (n) {

                var val = n.getValue();

                setNavTune();

                if (PFD != nil)

                    PFD.display.updateNAV({tune: val});

                if (MFD != nil)

                    MFD.display.updateNAV({tune: val});

            }, 1, 2);

    setlistener('/instrumentation/zkv1000/radios/comm-tune',

            func (n) {

                var val = n.getValue();

                setCommTune();

                if (PFD != nil)

                    PFD.display.updateCOMM({tune: val});

                if (MFD != nil)

                    MFD.display.updateCOMM({tune: val});

            }, 1, 2);

    setlistener('/instrumentation/zkv1000/afcs/heading-bug-deg',

            func (n) {

                var val = n.getValue();

                if (val != nil) {

                    if (PFD != nil)

                        PFD.display.updateHDG(val);

                    if (MFD != nil)

                        MFD.display.updateHDG(val);

                }

            }, 0, 2);

    setlistener('/instrumentation/zkv1000/PFD/knobs/CRS',

            func (n) {

                var val = n.getValue();

                if (val != nil) {

                    if (PFD != nil)

                        PFD.display.updateCRS();

                    if (MFD != nil)

                        MFD.display.updateCRS();

                }

            }, 0, 2);

    setlistener('/instrumentation/zkv1000/afcs/selected-alt-ft',

            func (n) {

                var val = n.getValue();

                if (val != nil  and PFD != nil) {

                    if (! PFD.display.screenElements['SelectedALT'].getVisible()) {

                        PFD.display.screenElements['SelectedALT'].show();

                        PFD.display.screenElements['SelectedALT-text'].show();

                        PFD.display.screenElements['SelectedALT-symbol'].show();

                        PFD.display.screenElements['SelectedALT-bug'].show();

                        PFD.display.screenElements['SelectedALT-bg'].show();

                    }

                    PFD.display.updateSelectedALT();

                }

            }, 0, 2);

    setlistener('/gear/gear/wow',

            func if (PFD != nil) PFD.display.updateXPDR(),

            0, 0);

    setlistener('/instrumentation/altimeter/setting-inhg',

            func if (PFD != nil) PFD.display.updateBARO(), 0, 2);

}

var deviceClass = {

    new: func (role) {

        var m = { parents: [ deviceClass ] };

        m.role = role;

        m.node = zkv.getNode(role, 1);

        m.data = {};

        foreach (var v; ['Vx', 'Vy', 'Vr', 'Vglide']) {

            m.data[v] = alerts.getNode(v).getValue();

            m.data[v ~ '-visible'] = 1;

        }

        m.display  = displayClass.new(m, m.role);

        m.display.showInitProgress(m.role);

        m.softkeys = softkeysClass.new(m, m.node, m.role);

        m.buttons  = buttonsClass.new(m.node);

        m.knobs    = knobsClass.new(m);

        m.display.loadsvg();

        m.display.loadGroup({

            hide : [

                'Failures',

                'SoftKeysTexts',

                'PFD-Widgets', 

                'COMM',

                'XPDR-TIME', 

                'NAV',

                'FlightInstruments', 

                'VDI',

                'OMI',

            ],

            clip : 'PitchScale',

        });

        m.windows  = pageClass.new(m);

        zkv.getNode(m.role ~ 'init').setIntValue(0);

        setprop('/instrumentation/zkv1000/' ~ m.role ~ '/status', 1);

        msg(m.role ~ ' switched on!');

        return m;

    },

};

var powerOn = func {

    foreach (var role; ['PFD', 'MFD'])

        if (zkv.getNode(role) != nil)

#            thread.newthread(func {

                zkv1000[role] = deviceClass.new(role);

#            });

    settimer(setListeners, 5);

}