# vim: set foldmethod=marker foldmarker={{{,}}} :
var MapTiles = {
# code from http://wiki.flightgear.org/Canvas_Snippets#A_simple_tile_map
    new : func (display) {
        var m = { parents: [MapTiles] };
        m.display = display;
        m.group = m.display.createGroup();
        m.tile_size = 256;
        m.zoom = 10;
        m.tile_server = getprop('/instrumentation/zkv1000/mfd/online-tiles-server');
        m.type = getprop('/instrumentation/zkv1000/mfd/online-tiles-type');
        m.maps_base = getprop("/sim/fg-home") ~ '/cache/maps';
        m.makeUrl = string.compileTemplate('https://{tile_server}/{type}/{z}/{x}/{y}.png');
        m.makePath = string.compileTemplate(m.maps_base ~ '/{tile_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.tiles = setsize([], m.num_tiles[0]);
        m.last_tile = [-1,-1];
        m.last_type = m.type;
        m.update_timer = maketimer(2, 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", "map-tile");
        }
    },

# this is the callback that will be regularly called by the timer to update the map
    updateTiles : func() {
        var lat = getprop('/position/latitude-deg');
        var lon = getprop('/position/longitude-deg');

        var n = math.pow(2, me.zoom);
        var offset = [
            n * ((lon + 180) / 360) - me.center_tile_offset[0],
            (1 - math.ln(math.tan(lat * math.pi/180) + 1 / math.cos(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 me.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: me.type,
                        tile_server : me.tile_server,
                    };

                    (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 = me.type;
        }
    },

    del : func() {
        me.update_timer.stop();
        call(canvas.Window.del, [], me);
    },
};

var MapNavDisplay = {
    new : func (display) {
        var m = { parents: [MapNavDisplay] };
        m.display = display;
        m.map = m.display.createGroup().createChild('map');
        m.ctrl_ns = canvas.Map.Controller.get("Aircraft position");
        m.ctrl_ns.SOURCES["map-dialog"] = {
            getPosition: func subvec(geo.aircraft_position().latlon(), 0, 2),
            getAltitude: func getprop('/position/altitude-ft'),
            getHeading:  func {
                if (me.aircraft_heading)
                    getprop('/orientation/heading-deg')
                else 0
            },
            aircraft_heading: 1,
        };

        m.Styles = {
            get : func(type) return m.Styles[type],
        };

        m.Options = {
            get : func(type) return m.Options[type],
        };

        m.listeners = [];

        return m;
    },

    showMap : func {
        me.setMap();
        me.setStyles();
        me.setOptions();
        me.refresh();
    },

    setMap : func {
        var source = me.ctrl_ns.SOURCES["map-dialog"];
        me.map.setController("Aircraft position", "map-dialog");
        me.map.setRange(40);
        me.map.setTranslation(
            me.display.get("view[0]")/2,
            me.display.get("view[1]")/2
        );
    },

    setStyles : func {
## set up a few keys supported by the DME.symbol file to customize appearance: {{{
        me.Styles.DME = {};
        me.Styles.DME.debug = 1; # HACK for benchmarking/debugging purposes
        me.Styles.DME.animation_test = 0; # for prototyping animated symbols

        me.Styles.DME.scale_factor = 0.4; # 40% (applied to whole group)
        me.Styles.DME.line_width = 3.0;
        me.Styles.DME.color_tuned = [0,1,0]; #rgb
        me.Styles.DME.color_default = [1,1,0];  #rgb

        me.Styles.APT = {};
        me.Styles.APT.scale_factor = 0.4; # 40% (applied to whole group)
        me.Styles.APT.line_width = 3.0;
        me.Styles.APT.color_default = [0,0.6,0.85];  #rgb
        me.Styles.APT.label_font_color = me.Styles.APT.color_default;
        me.Styles.APT.label_font_size=16;

        me.Styles.TFC = {};
        me.Styles.TFC.scale_factor = 0.4; # 40% (applied to whole group)

        me.Styles.WPT = {};
        me.Styles.WPT.scale_factor = 0.5; # 50% (applied to whole group)

        me.Styles.RTE = {};
        me.Styles.RTE.line_width = 2;

        me.Styles.FLT = {};
        me.Styles.FLT.line_width = 3;

        me.Styles.FIX = {};
        me.Styles.FIX.color = [1,0,0];
        me.Styles.FIX.scale_factor = 0.4; # 40%

        me.Styles.VOR = {};
        me.Styles.VOR.range_line_width = 2;
        me.Styles.VOR.radial_line_width = 1;
        me.Styles.VOR.scale_factor = 0.6; # 60%

        me.Styles.APS = {};
        me.Styles.APS.scale_factor = 0.5;
    },
#}}}

    setOptions : func {
        me.Options.FLT = {};
    },

    make_update_wrapper : func(name) {
        if (!contains(me.Options, name)) me.Options[name] = {};
        me.Options[name].update_wrapper = func(layer, fn) {
            fn();
        }
    },

    ToggleLayerVisible : func(name) {
        (var l = me.map.getLayer(name)).setVisible(l.getVisible());
    },

    SetLayerVisible : func(name,n=1) {
        me.map.getLayer(name).setVisible(n);
    },

    refresh : func {
        var r = func(name,vis=1,zindex=nil) return caller(0)[0];
        # TODO: we'll need some z-indexing here, right now it's just random
        foreach(var type; [r('TFC',0),r('APT'),r('DME'),r('VOR'),r('NDB'),r('FIX',0),r('RTE'),r('WPT'),r('FLT'),r('WXR',0),r('APS'), ] ) {
            if (1 and type.name != 'APS' and type.name != 'FLT') me.make_update_wrapper(type.name);
            me.map.addLayer(factory: canvas.SymbolLayer, type_arg: type.name,
                    visible: type.vis, priority: type.zindex,
                    style: me.Styles.get(type.name),
                    options: me.Options.get(type.name) 
                    );
            (func {
                 # Notify MapStructure about layer visibility changes:
                 var name = type.name;
                 props.globals.initNode("/sim/gui/dialogs/map-canvas/draw-"~name, type.vis, "BOOL");
                 append(me.listeners,
                         setlistener("/sim/gui/dialogs/map-canvas/draw-"~name,
                             func(n) me.SetLayerVisible(name,n.getValue()), 1, 2)
                       );
             })();
        }
    },
};