"use strict";

// Temporary config; this will move to config.js.
// All color values are given as Hue (0-359) / Saturation (0-100) / Lightness (0-100)
var ColorByAlt = {
        // HSL for planes with unknown altitude:
        unknown : { h: 0,   s: 0,   l: 40 },

        // HSL for planes that are on the ground:
        ground  : { h: 120, s: 100, l: 30 },

        air : {
                // These define altitude-to-hue mappings
                // at particular altitudes; the hue
                // for intermediate altitudes that lie
                // between the provided altitudes is linearly
                // interpolated.
                //
                // Mappings must be provided in increasing
                // order of altitude.
                //
                // Altitudes below the first entry use the
                // hue of the first entry; altitudes above
                // the last entry use the hue of the last
                // entry.
                h: [ { alt: 2000,  val: 20 },    // orange
                     { alt: 10000, val: 140 },   // light green
                     { alt: 40000, val: 300 } ], // magenta
                s: 85,
                l: 50,
        },

        // Changes added to the color of the currently selected plane
        selected : { h: 0, s: 0, l: +10 },

        // Changes added to the color of planes that have stale position info
        stale :    { h: 0, s: 0, l: +30 }
};

var PlaneSvg = "M 0,0 " +
        "M 1.9565564,41.694305 C 1.7174505,40.497708 1.6419973,38.448747 " +
        "1.8096508,37.70494 1.8936398,37.332056 2.0796653,36.88191 2.222907,36.70461 " +
        "2.4497603,36.423844 4.087816,35.47248 14.917931,29.331528 l 12.434577," +
        "-7.050718 -0.04295,-7.613412 c -0.03657,-6.4844888 -0.01164,-7.7625804 " +
        "0.168134,-8.6194061 0.276129,-1.3160905 0.762276,-2.5869575 1.347875," +
        "-3.5235502 l 0.472298,-0.7553719 1.083746,-0.6085497 c 1.194146,-0.67053522 " +
        "1.399524,-0.71738842 2.146113,-0.48960552 1.077005,0.3285939 2.06344," +
        "1.41299352 2.797602,3.07543322 0.462378,1.0469993 0.978731,2.7738408 " +
        "1.047635,3.5036272 0.02421,0.2570284 0.06357,3.78334 0.08732,7.836246 0.02375," +
        "4.052905 0.0658,7.409251 0.09345,7.458546 0.02764,0.04929 5.600384,3.561772 " +
        "12.38386,7.805502 l 12.333598,7.715871 0.537584,0.959688 c 0.626485,1.118378 " +
        "0.651686,1.311286 0.459287,3.516442 -0.175469,2.011604 -0.608966,2.863924 " +
        "-1.590344,3.127136 -0.748529,0.200763 -1.293144,0.03637 -10.184829,-3.07436 " +
        "C 48.007733,41.72562 44.793806,40.60197 43.35084,40.098045 l -2.623567," +
        "-0.916227 -1.981212,-0.06614 c -1.089663,-0.03638 -1.985079,-0.05089 -1.989804," +
        "-0.03225 -0.0052,0.01863 -0.02396,2.421278 -0.04267,5.339183 -0.0395,6.147742 " +
        "-0.143635,7.215456 -0.862956,8.845475 l -0.300457,0.680872 2.91906,1.361455 " +
        "c 2.929379,1.366269 3.714195,1.835385 4.04589,2.41841 0.368292,0.647353 " +
        "0.594634,2.901439 0.395779,3.941627 -0.0705,0.368571 -0.106308,0.404853 " +
        "-0.765159,0.773916 L 41.4545,62.83158 39.259237,62.80426 c -6.030106,-0.07507 " +
        "-16.19508,-0.495041 -16.870991,-0.697033 -0.359409,-0.107405 -0.523792," +
        "-0.227482 -0.741884,-0.541926 -0.250591,-0.361297 -0.28386,-0.522402 -0.315075," +
        "-1.52589 -0.06327,-2.03378 0.23288,-3.033615 1.077963,-3.639283 0.307525," +
        "-0.2204 4.818478,-2.133627 6.017853,-2.552345 0.247872,-0.08654 0.247455," +
        "-0.102501 -0.01855,-0.711959 -0.330395,-0.756986 -0.708622,-2.221756 -0.832676," +
        "-3.224748 -0.05031,-0.406952 -0.133825,-3.078805 -0.185533,-5.937448 -0.0517," +
        "-2.858644 -0.145909,-5.208974 -0.209316,-5.222958 -0.06341,-0.01399 -0.974464," +
        "-0.0493 -2.024551,-0.07845 L 23.247235,38.61921 18.831373,39.8906 C 4.9432155," +
        "43.88916 4.2929558,44.057819 3.4954426,43.86823 2.7487826,43.690732 2.2007966," +
        "42.916622 1.9565564,41.694305 z";

function PlaneObject(icao) {
	// Info about the plane
        this.icao      = icao;
        this.flight    = null;
	this.squawk    = null;
	this.selected  = false;

	// Basic location information
        this.altitude  = null;
        this.speed     = null;
        this.track     = null;
        this.position  = null;
        this.sitedist  = null;

	// Data packet numbers
	this.messages  = null;
        this.rssi      = null;

        // Track history as a series of line segments
        this.track_linesegs = [];
        this.history_size = 0;

	// When was this last updated (receiver timestamp)
        this.last_message_time = null;
        this.last_position_time = null;

        // When was this last updated (seconds before last update)
        this.seen = null;
        this.seen_pos = null;

        // Display info
        this.visible = true;
        this.marker = null;
        this.icon = { strokeWeight: 1,
                      path: PlaneSvg,
                      scale: 0.4,
                      fillColor: MarkerColor,
                      fillOpacity: 0.9,
                      anchor: new google.maps.Point(32, 32), // Set anchor to middle of plane.
                      rotation: 0 };
}

// Appends data to the running track so we can get a visual tail on the plane
// Only useful for a long running browser session.
PlaneObject.prototype.updateTrack = function(estimate_time) {
        var here = this.position;
        if (!here)
                return;

        if (this.track_linesegs.length == 0) {
                // Brand new track
                //console.log(this.icao + " new track");
                var newseg = { track : new google.maps.MVCArray([here,here]),
                               line : null,
                               head_update : this.last_position_time,
                               tail_update : this.last_position_time,
                               estimated : false,
                               ground : (this.altitude === "ground")
                             };
                this.track_linesegs.push(newseg);
                this.history_size += 2;
                return;
        }
        
        var lastseg = this.track_linesegs[this.track_linesegs.length - 1];
        var lastpos = lastseg.track.getAt(lastseg.track.getLength() - 1);
        var elapsed = (this.last_position_time - lastseg.head_update);
        
        var new_data = (here !== lastpos);
        var est_track = (elapsed > estimate_time);
        var ground_track = (this.altitude === "ground");
        
        if (!new_data)
                return false;
        
        if (est_track) {
                if (!lastseg.estimated) {
                        // >5s gap in data, create a new estimated segment
                        //console.log(this.icao + " switching to estimated");
                        this.track_linesegs.push({ track : new google.maps.MVCArray([lastpos, here]),
                                                   line : null,
                                                   head_update : this.last_position_time,
                                                   estimated : true });
                        this.history_size += 2;
                        return true;
                }
                
                // Append to ongoing estimated line
                //console.log(this.icao + " extending estimated (" + lastseg.track.getLength() + ")");
                lastseg.track.push(here);
                lastseg.head_update = this.last_position_time;
                this.history_size++;
                return true;
        }
        
        if (lastseg.estimated) {
                // We are back to good data.
                //console.log(this.icao + " switching to good track");
                this.track_linesegs.push({ track : new google.maps.MVCArray([lastpos, here]),
                                           line : null,
                                           head_update : this.last_position_time,
                                           tail_update : this.last_position_time,
                                           estimated : false,
                                           ground : (this.altitude === "ground") });
                this.history_size += 2;
                return true;
        }
        
        if ( (lastseg.ground && this.altitude !== "ground") ||
             (!lastseg.ground && this.altitude === "ground") ) {
                //console.log(this.icao + " ground state changed");
                // Create a new segment as the ground state changed.
                // assume the state changed halfway between the two points
                var midpoint = google.maps.geometry.spherical.interpolate(lastpos,here,0.5);
                lastseg.track.push(midpoint);
                this.track_linesegs.push({ track : new google.maps.MVCArray([midpoint,here,here]),
                                           line : null,
                                           head_update : this.last_position_time,
                                           tail_update : this.last_position_time,
                                           estimated : false,
                                           ground : (this.altitude === "ground") });
                this.history_size += 4;
                return true;
        }
        
        // Add more data to the existing track.
        // We only retain some historical points, at 5+ second intervals,
        // plus the most recent point
        if (this.last_position_time - lastseg.tail_update >= 5) {
                // enough time has elapsed; retain the last point and add a new one
                //console.log(this.icao + " retain last point");
                lastseg.track.push(here);
                lastseg.tail_update = lastseg.head_update;
                this.history_size ++;
        } else {
                // replace the last point with the current position
                lastseg.track.setAt(lastseg.track.getLength()-1, here);
        }
        lastseg.head_update = this.last_position_time;
        return true;
};

// This is to remove the line from the screen if we deselect the plane
PlaneObject.prototype.clearLines = function() {
        for (var i = 0; i < this.track_linesegs.length; ++i) {
                var seg = this.track_linesegs[i];
                if (seg.line !== null) {
                        seg.line.setMap(null);
                        seg.line = null;
                }
        }
};

PlaneObject.prototype.getMarkerColor = function() {
        // Emergency squawks override everything else
        if (this.squawk in SpecialSquawks)
                return SpecialSquawks[this.squawk].markerColor;

        var h, s, l;

        if (this.altitude === null) {
                h = ColorByAlt.unknown.h;
                s = ColorByAlt.unknown.s;
                l = ColorByAlt.unknown.l;
        } else if (this.altitude === "ground") {
                h = ColorByAlt.ground.h;
                s = ColorByAlt.ground.s;
                l = ColorByAlt.ground.l;
        } else {
                s = ColorByAlt.air.s;
                l = ColorByAlt.air.l;

                // find the pair of points the current altitude lies between,
                // and interpolate the hue between those points
                var hpoints = ColorByAlt.air.h;
                h = hpoints[0].val;
                for (var i = hpoints.length-1; i >= 0; --i) {
                        if (this.altitude > hpoints[i].alt) {
                                if (i == hpoints.length-1) {
                                        h = hpoints[i].val;
                                } else {
                                        h = hpoints[i].val + (hpoints[i+1].val - hpoints[i].val) * (this.altitude - hpoints[i].alt) / (hpoints[i+1].alt - hpoints[i].alt)
                                }
                                break;
                        }
                }
        }

        // If we have not seen a recent position update, change color
        if (this.seen_pos > 15) {
                h += ColorByAlt.stale.h;
                s += ColorByAlt.stale.s;
                l += ColorByAlt.stale.l;
        }

        // If this marker is selected, change color
        if (this.selected){
                h += ColorByAlt.selected.h;
                s += ColorByAlt.selected.s;
                l += ColorByAlt.selected.l;
        }

        if (h < 0) {
                h = (h % 360) + 360;
        } else if (h >= 360) {
                h = h % 360;
        }

        if (s < 5) s = 5;
        else if (s > 95) s = 95;

        if (l < 5) l = 5;
        else if (l > 95) l = 95;

        return 'hsl(' + h.toFixed(0) + ',' + s.toFixed(0) + '%,' + l.toFixed(0) + '%)'
}

PlaneObject.prototype.updateIcon = function() {
        var col = this.getMarkerColor();
        var weight = this.selected ? 2 : 1;
        var rotation = (this.track === null ? 0 : this.track);
        
        if (col === this.icon.fillColor && weight === this.icon.strokeWeight && rotation === this.icon.rotation)
                return false;  // no changes
        
        this.icon.fillColor = col;                
        this.icon.strokeWeight = weight;
        this.icon.rotation = rotation;
        if (this.marker)
                this.marker.setIcon(this.icon);
        
        return true;
};

// Update our data
PlaneObject.prototype.updateData = function(receiver_timestamp, data) {
	// Update all of our data
	this.messages	= data.messages;
        this.rssi       = data.rssi;
	this.last_message_time = receiver_timestamp - data.seen;
        
        if (typeof data.altitude !== "undefined")
		this.altitude	= data.altitude;
        if (typeof data.vert_rate !== "undefined")
		this.vert_rate	= data.vert_rate;
        if (typeof data.speed !== "undefined")
		this.speed	= data.speed;
        if (typeof data.track !== "undefined")
                this.track	= data.track;
        if (typeof data.lat !== "undefined") {
                this.position   = new google.maps.LatLng(data.lat, data.lon);
                this.last_position_time = receiver_timestamp - data.seen_pos;

                if (SitePosition !== null) {
                        this.sitedist = google.maps.geometry.spherical.computeDistanceBetween (SitePosition, this.position);
                }
        }
        if (typeof data.flight !== "undefined")
		this.flight	= data.flight;
        if (typeof data.squawk !== "undefined")
		this.squawk	= data.squawk;
};

PlaneObject.prototype.updateTick = function(receiver_timestamp, last_timestamp) {
        // recompute seen and seen_pos
        this.seen = receiver_timestamp - this.last_message_time;
        this.seen_pos = (this.last_position_time === null ? null : receiver_timestamp - this.last_position_time);
        
	// If no packet in over 58 seconds, clear the plane.
	if (this.seen > 58) {
                if (this.visible) {
                        //console.log("hiding " + this.icao);
                        this.clearMarker();
                        this.visible = false;
			if (SelectedPlane == this.icao)
                                selectPlaneByHex(null,false);
                }
	} else {
                this.visible = true;
                if (this.position !== null) {
			if (this.updateTrack(receiver_timestamp - last_timestamp + 5)) {
                                this.updateLines();
                                this.updateMarker(true);
                        } else { 
                                this.updateMarker(false); // didn't move
                        }
                }
	}
};

PlaneObject.prototype.clearMarker = function() {
	if (this.marker) {
		this.marker.setMap(null);
                google.maps.event.clearListeners(this.marker, 'click');
		this.marker = null;
	}
};

// Update our marker on the map
PlaneObject.prototype.updateMarker = function(moved) {
        if (!this.visible) {
                this.clearMarker();
                return;
        }
        
	if (this.marker) {
                if (moved)
			this.marker.setPosition(this.position);
                this.updateIcon();
	} else {
                this.updateIcon();
		this.marker = new google.maps.Marker({
			position: this.position,
			map: GoogleMap,
			icon: this.icon,
			visible: true
		});
                
		// Trap clicks for this marker.
		google.maps.event.addListener(this.marker, 'click', selectPlaneByHex.bind(undefined,this.icao,false));
		google.maps.event.addListener(this.marker, 'dblclick', selectPlaneByHex.bind(undefined,this.icao,true));
	}
        
	// Setting the marker title
        var title = (this.flight === null || this.flight.length == 0) ? this.icao : (this.flight+' ('+this.icao+')');
        if (title !== this.marker.title)
	        this.marker.setTitle(title);
};

// Update our planes tail line,
PlaneObject.prototype.updateLines = function() {
        if (!this.selected)
                return;
        
        for (var i = 0; i < this.track_linesegs.length; ++i) {
                var seg = this.track_linesegs[i];
                if (seg.line === null) {
                        // console.log("create line for seg " + i + " with " + seg.track.getLength() + " points" + (seg.estimated ? " (estimated)" : ""));
                        // for (var j = 0; j < seg.track.getLength(); j++) {
                        //         console.log("  point " + j + " at " + seg.track.getAt(j).lat() + "," + seg.track.getAt(j).lng());
                        // }
                        
                        if (seg.estimated) {
                                var lineSymbol = {
                                        path: 'M 0,-1 0,1',
                                        strokeOpacity : 1,
                                        strokeColor : '#804040',
                                        strokeWeight : 2,
                                        scale: 2
                                };
                                
                                seg.line = new google.maps.Polyline({
                                        path: seg.track,
					strokeOpacity: 0,
                                        icons: [{
                                                icon: lineSymbol,
                                                offset: '0',
                                                repeat: '10px' }],
                                        map : GoogleMap });
                        } else {
                                seg.line = new google.maps.Polyline({
                                        path: seg.track,
					strokeOpacity: 1.0,
					strokeColor: (seg.ground ? '#408040' : '#000000'),
					strokeWeight: 3,
					map: GoogleMap });
                        }
                }
        }
};

PlaneObject.prototype.destroy = function() {
        this.clearLines();
        this.clearMarker();
};