# vim: set foldmethod=marker foldmarker={{{,}}} :

var MapTiles = {

# displays maps background from web tiles {{{

# code from http://wiki.flightgear.org/Canvas_Snippets#A_simple_tile_map

    new : func (display) {

        var m = { parents: [MapTiles] };

        m.display = display;

        m.tile_size = 256;

        m.zoom = 10;

        m.maps_base = getprop("/sim/fg-home") ~ '/cache/maps';

        m.makeUrl = string.compileTemplate('https://{server}/{type}/{z}/{x}/{y}.png{apikey}');

        m.makePath = string.compileTemplate(m.maps_base ~ '/{server}/{type}/{z}/{x}/{y}.png');

        m.num_tiles = [

            math.ceil( m.display.get('view[0]') / m.tile_size ) + 1,

            math.ceil( m.display.get('view[1]') / m.tile_size ) + 1

        ];

        m.center_tile_offset = [

            (m.num_tiles[0] - 1) / 2,

            (m.num_tiles[1] - 1) / 2

        ];

        m.group = m.display.createGroup()

            .setCenter(

                    m.display.get('view[0]') / 2,

                    m.display.get('view[1]') / 2

            );

        m.tiles = setsize([], m.num_tiles[0]);

        m.last_tile = [-1,-1];

        m.last_type = data['tiles-type'];

        m.update_timer = maketimer(1, m, m.updateTiles);

        return m;

    },

# Simple user interface (Buttons for zoom and label for displaying it)

    changeZoom : func (d) {

        me.zoom = math.max(2, math.min(19, me.zoom + d));

        call(me.updateTiles, [], me);

    },

# initialize the map by setting up a grid of raster images

    initialize_grid : func {

        for(var x = 0; x < me.num_tiles[0]; x += 1) {

            me.tiles[x] = setsize([], me.num_tiles[1]);

            for(var y = 0; y < me.num_tiles[1]; y += 1)

                me.tiles[x][y] = me.group.createChild('image', 'tile ' ~ x ~ ',' ~ y);

        }

    },

# this is the callback that will be regularly called by the timer to update the map

    updateTiles : func {

#        me.group.setRotation(-data.hdg * D2R);

        var n = math.pow(2, me.zoom);

        var offset = [

            n * ((data.lon + 180) / 360) - me.center_tile_offset[0],

            (1 - math.ln(math.tan(data.lat * math.pi/180) + 1 / math.cos(data.lat * math.pi/180)) / math.pi) / 2 * n - me.center_tile_offset[1]

        ];

        var tile_index = [int(offset[0]), int(offset[1])];

        var ox = tile_index[0] - offset[0];

        var oy = tile_index[1] - offset[1];

        for(var x = 0; x < me.num_tiles[0]; x += 1)

            for(var y = 0; y < me.num_tiles[1]; y += 1)

                me.tiles[x][y]

                    .setTranslation(int((ox + x) * me.tile_size + 0.5), int((oy + y) * me.tile_size + 0.5));

        if(    tile_index[0] != me.last_tile[0]

                or tile_index[1] != me.last_tile[1]

                or data['tiles-type'] != me.last_type ) {

            for(var x = 0; x < me.num_tiles[0]; x += 1)

                for(var y = 0; y < me.num_tiles[1]; y += 1) {

                    var pos = {

                        z: me.zoom,

                        x: int(offset[0] + x),

                        y: int(offset[1] + y),

                        type: data['tiles-type'],

                        server : data['tiles-server'],

                        apikey: data['tiles-apikey'],

                    };

                    (func {

                        var img_path = me.makePath(pos);

                        printlog('debug', 'img_path: ', img_path);

                        var tile = me.tiles[x][y];

                        if( io.stat(img_path) == nil ) { # image not found, save in $FG_HOME

                            var img_url = me.makeUrl(pos);

                            printlog('debug', 'requesting ' ~ img_url);

                            http.save(img_url, img_path)

                                .done(func {printlog('info', 'received image ' ~ img_path); tile.set("src", img_path);})

                                .fail(func (r) printlog('warn', 'Failed to get image ' ~ img_path ~ ' ' ~ r.status ~ ': ' ~ r.reason));

                        }

                        else { # cached image found, reusing

                            printlog('debug', 'loading ' ~ img_path);

                            tile.set("src", img_path);

                        }

                    })();

                }

            me.last_tile = tile_index;

            me.last_type = data['tiles-type'];

        }

    },

    del : func {

        me.update_timer.stop();

        call(canvas.Window.del, [], me);

    },

};

# }}}

# The following is largely inspired from the Extra500 Avidyne Entegra 9 

# https://gitlab.com/extra500/extra500.git

# Many thanks to authors: Dirk Dittmann and Eric van den Berg

var MapIconCache = {

# creates at init an icons cache for navaids, airports and airplane {{{

    new : func (svgFile) {

        var m = { parents:[MapIconCache] };

        m._canvas = canvas.new( {

            'name': 'MapIconCache',

            'size': [512, 512],

            'view': [512, 512],

            'mipmapping': 1

        });

        m._canvas.addPlacement( {'type': 'ref'} );

        m._canvas.setColorBackground(1,1,1,0);

        m._group = m._canvas.createGroup('MapIcons');

        canvas.parsesvg(m._group, data.zkv1000_reldir ~ svgFile);

        m._sourceRectMap = {};

        var icons = [ 'airplane' ];

        foreach (var near; [0, 1])

            foreach (var surface; [0, 1])

                foreach (var tower; [0, 1])

                    foreach (var center; tower ? [0, 1] : [ 0 ])

                        append(icons, 'Airport_' ~ near ~ surface ~ tower ~ center);

        foreach (var type; ['VOR', 'DME', 'TACAN', 'NDB'])

            append(icons, 'Navaid_' ~ type);

        foreach (var i; icons)

            m.registerIcon(i);

        return m;

    },

    registerIcon : func (id) {

        me._sourceRectMap[id] = {

            'bound' : [],

            'size'  : [],

        };

        var element = me._group.getElementById(id);

        if (element != nil) {

            me._sourceRectMap[id].bound = element.getTransformedBounds();

            # TODO ugly hack ? check for reason!

            var top     = 512 - me._sourceRectMap[id].bound[3];

            var bottom  = 512 - me._sourceRectMap[id].bound[1];

            me._sourceRectMap[id].bound[1] = top;

            me._sourceRectMap[id].bound[3] = bottom;

            me._sourceRectMap[id].size = [

                me._sourceRectMap[id].bound[2] - me._sourceRectMap[id].bound[0],

                me._sourceRectMap[id].bound[3] - me._sourceRectMap[id].bound[1]

            ];

        }

        else {

            print('MapIconCache.registerIcon(' ~ id ~ ') fail');

        }

    },

    getBounds : func (id) {

        return me._sourceRectMap[id].bound;

    },

    getSize : func (id) {

        return me._sourceRectMap[id].size;

    },

    boundIconToImage : func (id, image, center=1) {

        if (!contains(me._sourceRectMap, id)) {

            print('MapIconCache.boundIconToImage('~id~') ... no available.');

            id = 'Airport_0001';

        }

        image.setSourceRect(

                me._sourceRectMap[id].bound[0],

                me._sourceRectMap[id].bound[1],

                me._sourceRectMap[id].bound[2],

                me._sourceRectMap[id].bound[3],

                0);

        image.setSize(

                me._sourceRectMap[id].size[0],

                me._sourceRectMap[id].size[1]);

        if (center) {

            image.setTranslation(

                    -me._sourceRectMap[id].size[0]/2,

                    -me._sourceRectMap[id].size[1]/2);

        }

    },

};

var mapIconCache = MapIconCache.new('Models/MapIcons.svg');

# }}}

var MapAirportItem = {

# manage airports items by adding the ID and runways on associated icon {{{

    new : func (id) {

        var m = {parents:[MapAirportItem]};

        m._id = id;

        m._can = {

            'group' : nil,

            'label' : nil,

            'image' : nil,

            'layout': nil,

            'runway': [],

        };

        m._mapAirportIcon = {

            'near'      : 0,

            'surface'   : 0,

            'tower'     : 0,

            'center'    : 0,

            'displayed' : 0,

            'icon'      : '',

        };

        return m;

    },

    create : func (group) {

        me._can.group = group.createChild('group', 'airport_' ~ me._id);

        me._can.image = me._can.group.createChild('image', 'airport-image_' ~ me._id)

            .setFile(mapIconCache._canvas.getPath())

            .setSourceRect(0,0,0,0,0);

        me._can.label = me._can.group.createChild('text', 'airport-label_' ~ me._id)

            .setDrawMode( canvas.Text.TEXT )

            .setTranslation(0, 37)

            .setAlignment('center-bottom-baseline')

            .setFont('LiberationFonts/LiberationSans-Regular.ttf')

            .setFontSize(32);

        me._can.label.set('fill','#BACBFB');

        me._can.label.set('stroke','#000000');

        me._can.layout = group.createChild('group','airport_layout' ~ me._id);

        me._can.layoutIcon = group.createChild('group','airport_layout_Icon' ~ me._id);

        return me._can.group;

    },

    draw : func (apt, mapOptions) {

        me._mapAirportIcon.near = mapOptions.range > 30 ? 0 : 1;

        me._mapAirportIcon.surface  = 0;

        me._mapAirportIcon.tower    = 0;

        me._mapAirportIcon.center   = 0;

        me._mapAirportIcon.displayed    = 0;

        # TODO make departure and destination airports specific

        var aptInfo = airportinfo(apt.id);

        me._can.layout.removeAllChildren();

        me._can.layoutIcon.removeAllChildren();

        me._mapAirportIcon.tower = (size(aptInfo.comms('tower')) > 0);

        me._mapAirportIcon.center = me._mapAirportIcon.tower and (size(aptInfo.comms('approach')) > 0);

        foreach (var rwy; keys(aptInfo.runways)) {

            var runway = aptInfo.runways[rwy];

            me._mapAirportIcon.surface = MAP_RUNWAY_SURFACE[runway.surface] ? 1 : me._mapAirportIcon.surface;

            me._mapAirportIcon.displayed = runway.length > mapOptions.runwayLength ? 1 : me._mapAirportIcon.displayed;

            if (mapOptions.range <= 10) {    # drawing real runways

                me._can.layout.createChild('path', 'airport-runway-' ~ me._id ~ '-' ~ runway.id)

                    .setStrokeLineWidth(7)

                    .setColor(1,1,1)

                    .setColorFill(1,1,1)

                    .setDataGeo([

                        canvas.Path.VG_MOVE_TO,

                        canvas.Path.VG_LINE_TO,

                        canvas.Path.VG_CLOSE_PATH

                    ],[

                        'N' ~ runway.lat, 'E' ~ runway.lon,

                        'N' ~ runway.reciprocal.lat, 'E' ~ runway.reciprocal.lon,

                    ]);

            }

            elsif (mapOptions.range <= 30) {     #draw icon runways

                me._can.layoutIcon.setGeoPosition(apt.lat, apt.lon);

                me._can.layoutIcon.createChild('path', 'airport-runway-' ~ me._id ~ '-' ~ runway.id)

                    .setStrokeLineWidth(7)

                    .setColor(1,1,1)

                    .setColorFill(1,1,1)

                    .setData([

                        canvas.Path.VG_MOVE_TO,

                        canvas.Path.VG_LINE_TO,

                        canvas.Path.VG_CLOSE_PATH

                    ],[

                        0, -20,

                        0, 20,

                    ])

                    .setRotation((runway.heading)* D2R);

            }

        }

        me._mapAirportIcon.icon = 'Airport_'

            ~ me._mapAirportIcon.near

            ~ me._mapAirportIcon.surface

            ~ me._mapAirportIcon.tower

            ~ me._mapAirportIcon.center;

        if (me._mapAirportIcon.displayed) {

            me._can.label.setText(apt.id);

            me._can.group.setGeoPosition(apt.lat, apt.lon);

            if (mapOptions.range <= 10) {

                me._can.image.setVisible(0);

                me._can.layout.setVisible(1);

            }

            elsif (mapOptions.range <= 30) {

                mapIconCache.boundIconToImage(me._mapAirportIcon.icon, me._can.image);

                me._can.image.setVisible(1);

                me._can.layout.setVisible(1);

            }

            else {

                mapIconCache.boundIconToImage(me._mapAirportIcon.icon, me._can.image);

                me._can.layout.setVisible(0);

                me._can.image.setVisible(1);

            }

            me._can.group.setVisible(1);

        }

        return me._mapAirportIcon.displayed;

    },

    update : func (mapOptions) {

        if (mapOptions.range <= 10) { }

        elsif (mapOptions.range <= 30)

            me._can.layoutIcon.setRotation(-mapOptions.orientation * D2R);

        else { }

    },

    setVisible : func (visibility) {

        me._can.group.setVisible(visibility);

        me._can.layout.setVisible(visibility);

        me._can.image.setVisible(visibility);

        me._can.layoutIcon.setVisible(visibility);

    },

};

# }}}

var MapNavaidItem = {

# manage navaids items by adding ID in the icon {{{

    new : func (id, type) {

        var m = {parents:[MapNavaidItem]};

        m._id = id;

        m._type = type;

        m._can = {

            'group' : nil,

            'label' : nil,

            'image' : nil,

        };

        return m;

    },

    create : func (group) {

        me._can.group = group.createChild('group', me._type ~ '_' ~ me._id);

        me._can.image = me._can.group.createChild('image', me._type ~ '-image_' ~ me._id)

            .setFile(mapIconCache._canvas.getPath())

            .setSourceRect(0,0,0,0,0);

        me._can.label = me._can.group.createChild('text', me._type ~ '-label_' ~ me._id)

            .setDrawMode( canvas.Text.TEXT )

            .setTranslation(0,42)

            .setAlignment('center-bottom-baseline')

            .setFont('LiberationFonts/LiberationSans-Regular.ttf')

            .setFontSize(32);

        me._can.label.set('fill','#BACBFB');

        me._can.label.set('stroke','#000000');

        return me._can.group;

    },

    setData : func (navaid, type) {

        mapIconCache.boundIconToImage('Navaid_' ~ type, me._can.image);

        me._can.label.setText(navaid.id);

        me._can.group.setGeoPosition(navaid.lat, navaid.lon);

    },

    setVisible : func (visibility) {

        me._can.group.setVisible(visibility);

    },

};

# }}}

var MAP_RUNWAY_SURFACE =  {0:0, 1:1, 2:1, 3:0, 4:0, 5:0, 6:1, 7:1, 8:0, 9:0, 10:0, 11:0, 12:0};

var MAP_RUNWAY_AT_RANGE = {2:0, 4:0, 10:0, 20:0, 30:0, 40:250, 50:500, 80:1000, 160:2000, 240:3000}; # TODO: make it compatible with tiles zoom level

var MAP_TXRANGE_VOR     = {2:0, 4:0, 10:0, 20:0, 30:0, 40:20,  50:25,  80:30,   160:50,   240:100}; # TODO: make it compatible with tiles zoom level

####

# Declutter

#   land

#       0 : 'Terrain'

#       1 : 'Political boundaries'

#       2 : 'River/Lakes/Oceans'

#       3 : 'Roads'

#   Nav

#       0 : 'Airspace'

#       1 : 'Victor/Jet airways'

#       2 : 'Obstacles'

#       3 : 'Navaids'

var PositionedLayer = {

# the layer to show navaids, airports and airplane symbol {{{

    new : func (display) {

        var m = {parents : [PositionedLayer]};

        m._model = nil;

        m._group = display.createGroup().createChild('map', 'MFD map');

        m._can = {};

        m._cache = {};

        foreach (var n; ['airport', 'VOR', 'TACAN', 'NDB', 'DME']) {

            m._can[n] = m._group.createChild('group', n);

            m._cache[n] = {

                'data' : [],

                'index' : 0,

                'max' : 100,

            };

        }

        m._mapOptions = {

            declutterLand : 3,

            declutterNAV  : 3,

            lightning     : 0,

            reports       : 0,

            overlay       : 0,

            range         : 30,

            rangeLow      : 15,

            runwayLength  : -1,

            orientation   : 0,

        };

        m._results = nil;

        m._timer = maketimer(600, m, PositionedLayer.update);

        m._visibility = 0;

        return m;

    },

    update : func {

        if (me._visibility == 1) {

            me.loadAirport();

            foreach (var n; ['VOR', 'TACAN', 'NDB', 'DME'])

                me.loadNavaid(n);

        }

        #TODO compute from actual speed (220 = Vne extra500)

        me._timer.restart(me._mapOptions.range/(220/3600));

    },

    _onVisibilityChange : func {

        me._group.setVisible(me._visibility);

    },

    setMapOptions : func (mapOptions) {

        me._mapOptions = mapOptions;

        me.update();

    },

    updateOrientation : func (value) {

        me._mapOptions.orientation = value;

        for (var i = 0 ; i < me._cache.airport.index ; i +=1) {

            item = me._cache.airport.data[i];

            item.update(me._mapOptions);

        }

    },

    setRange : func (range=100) {

        me._mapOptions.range = range;

        me._mapOptions.rangeLow = range/2;

        me.update();

    },

    setRotation : func (deg) {

        me._group.setRotation(deg * D2R);

    },

    setVisible : func (v) {

        if (me._visibility != v) {

            me._visibility = v;

            me._onVisibilityChange();

        }

    },

    _onVisibilityChange : func {

        me._group.setVisible(me._visibility);

    },

    # positioned.findWithinRange : any, fix, vor, ndb, ils, dme, tacan

    loadAirport : func {

        me._cache.airport.index = 0;

        var results = positioned.findWithinRange(me._mapOptions.range * 2.5, 'airport');

        var item = nil;

        if (me._mapOptions.declutterNAV >= 2)

            me._mapOptions.runwayLength = MAP_RUNWAY_AT_RANGE[me._mapOptions.range];

        elsif (me._mapOptions.declutterNAV >= 1)

            me._mapOptions.runwayLength = 2000;

        else

            me._mapOptions.runwayLength = 3000;

        if (me._mapOptions.runwayLength >= 0) {

            foreach (var apt; results) {

                if (me._cache.airport.index >= me._cache.airport.max )

                    break;

                if (size(me._cache.airport.data) > me._cache.airport.index)

                    item = me._cache.airport.data[me._cache.airport.index];

                else {

                    item = MapAirportItem.new(me._cache.airport.index);

                    item.create(me._can.airport);

                    append(me._cache.airport.data, item);

                }

                if (item.draw(apt, me._mapOptions)) {

                    item.setVisible(1);

                    me._cache.airport.index += 1;

                }

            }

        }

        for (var i = me._cache.airport.index ; i < size(me._cache.airport.data) ; i +=1) {

            item = me._cache.airport.data[i];

            item.setVisible(0);

        }

    },

    loadNavaid : func (type) {

        me._cache[type].index = 0;

        if (me._mapOptions.declutterNAV >= 3) { # TODO test for DME and NDB range < 100nm

            var range = me._mapOptions.range * 2.5;

            var txRange = MAP_TXRANGE_VOR[me._mapOptions.range];

            var results = positioned.findWithinRange(range, type);

            var item = nil;

            foreach (var n; results) {

                if (n.range_nm < txRange)

                    break;

                if (me._cache[type].index >= me._cache[type].max )

                    break;

                if (size(me._cache[type].data) > me._cache[type].index) {

                    item = me._cache[type].data[me._cache[type].index];

                    item.setData(n, type);

                }

                else {

                    item = MapNavaidItem.new(me._cache[type].index, type);

                    item.create(me._can[type]);

                    item.setData(n, type);

                    append(me._cache[type].data, item);

                }

                item.setVisible(1);

                me._cache[type].index += 1;

            }

        }

        for (var i = me._cache[type].index ; i < size(me._cache[type].data) ; i +=1) {

            item = me._cache[type].data[i];

            item.setVisible(0);

        }

    },

};

# }}}