###

# Not Yet Implemented: just draw a warnig box during 3 seconds

var nyi = func (x) { gui.popupTip(x ~ ': not yet implemented', 3) }

###

# print message in terminal

var msg = func (str) { print('ZKV1000 >> ', str) }

###

# print message in popup

var msg_popup = func (str...) { gui.popupTip("ZKV1000\n" ~ str, 3) }

###

# just do nothing

var void = func { }

###

# returns decimal part arg

var frac = func (x) { return (x - int(x)) }

###

# rounds regarding proximity

# e.g.:

#   round(1540, 300) gives 1500

#   round(2370, 400) gives 2400

var round = func (x, m = 1) {

    var v = x / m;

    if (frac(v) >= 0.5) v += 1;

    return (int(v) * m);

}

###

# rounds regarless proximity

# e.g.:

#   round_bis(1540, 300) gives 1500

#   round_bis(2370, 400) gives 2000

var round_bis = func (x, m) {

    var r = round(x, m);

    if (r > x) r -= m;

    return r;

}

var alt = vs = vs_abs = ias = tas = pitch = roll = agl = stall = rpm = 0;

var getData = func {

    alt = math.abs(getprop('/instrumentation/altimeter/indicated-altitude-ft'));

    vs = getprop('/velocities/vertical-speed-fps') * 60; 

    ias = getprop('/instrumentation/airspeed-indicator/indicated-speed-kt');

    pitch = getprop('/orientation/pitch-deg');

    roll = getprop('/orientation/pitch-deg');

    agl = getprop('/position/altitude-agl-ft');

    stall = getprop('/sim/alarms/stall-warning');

    gear = getprop('/controls/gears/gear');

}

###

# returns DMS coordinates

# d is decimal longitude or latitude

# c should be one of E, W, S or N

# inspired from FG source: $FGSRC/src/Main/fg_props.cxx 

var DMS = func (d, c) {

    var deg = min = sec = 0.0;

    d = abs(d);

    deg = d + 0.05 / 3600;

    min = (deg - int(deg)) * 60;

    sec = (min - int(min)) * 60 - 0.049;

    return sprintf('%d %02d %04.1f %s', int(deg), int(min), abs(sec), c);

}

var timeUTC = func {

    setprop('/instrumentation/zkv1000/infos/time', sprintf('UTC %02i%02i%02i',

                getprop('/sim/time/utc/hour'),

                getprop('/sim/time/utc/minute'),

                getprop('/sim/time/utc/second')));

}

var timeLCL = func {

    var utc_hour = getprop('/sim/time/utc/hour') + (getprop('/sim/time/local-offset') / 3600);

    if (utc_hour > 23) utc_hour -= 24;

    if (utc_hour < 0)  utc_hour += 24;

    setprop('/instrumentation/zkv1000/infos/time', sprintf('LCL  %02i%02i%02i',

                utc_hour, 

                getprop('/sim/time/utc/minute'),

                getprop('/sim/time/utc/second')));

}

var timeRL = func {

    setprop('/instrumentation/zkv1000/infos/time', sprintf('RL   %02i%02i%02i',

                getprop('/sim/time/real/hour'),

                getprop('/sim/time/real/minute'),

                getprop('/sim/time/real/second')));

}

###

# Loads a fligtplan (route) from a XML file

# replaces existing route by the new one

var loadFPLfromFile = func (file) {

    afcs.getNode('route').removeChildren();

    fgcommand('loadxml', props.Node.new({

              'filename': file,

              'targetnode': afcs.getNode('route').getPath()})

            );

    FPLtoRouteManager();

    msg('route loaded from ' ~ file);

}

var wipeRoute = func {

    var command = props.globals.getNode('/instrumentation/gps/command');

    var v = getprop('/autopilot/route-manager/route/num');

    setprop('/autopilot/route-manager/active', 0);

    setprop('/instrumentation/gps/scratch/index', 0);

    while (v) {

        v -= 1;

        command.setValue('route-delete');

    }

}

var FPLtoRouteManager = func {

    wipeRoute();

    lockSearches();

    var scratch = props.globals.getNode('/instrumentation/gps/scratch');

    var command = scratch.getNode('../command');

    foreach (var waypoint; afcs.getNode('route').getChildren()) {

        scratch.getNode('index').setIntValue(-1);

        searchNearestNavaid(waypoint.getNode('type').getValue(), 1, waypoint.getPath());

        command.setValue('route-insert-after');

    }

    unlockSearches();

}

####

# Search nav facilities

var searchNearestNavaid = func (type, quantity = 1, path = nil) {

    getprop('/instrumentation/zkv1000/searches-locked') or return;

    scratch = props.globals.getNode('/instrumentation/gps/scratch/');

    scratch.getNode('max-results', 1).setIntValue(quantity);

    var lat = lon = -9999;

    if (path != nil) {

        if (props.globals.getNode(path) != nil) {

            lon = getprop(path ~ '/longitude-deg');

            lat = getprop(path ~ '/latitude-deg');

        }

    }

    scratch.getNode('longitude-deg', 1).setDoubleValue(lon);

    scratch.getNode('latitude-deg', 1).setDoubleValue(lat);

    scratch.getNode('type').setValue(type);

    setprop('/instrumentation/gps/command', 'nearest');

}

var lockSearches = func (v = 1) {

    props.globals.getNode('/instrumentation/zkv1000/searches-locked', 1).setBoolValue(v);

}

var unlockSearches = func {

    lockSearches(0);

}

#var dialog = func {

#    var d = gui.Widget.new();

#    d.set({'name': 'ZKV1000 text entry interface', 

#           'layout': 'vbox',

#           'default-padding' : 0});

#    d.addChild('text').

#}

var computeAltitudeDiff = void;

var computeAirspeedDiff = void;

var FLCcomputation = void;

var checkRollAcquisition = void;

var checkPitchAcquisition = void;

var checkTrafficProximity = void;

var manageLandingGears = void;

var checkAbnormalAttitude = void;

var applyFilter = void;