// For docs, see:
// http://developer.mapquest.com/web/products/open/directions-service
// http://open.mapquestapi.com/directions/
// https://github.com/apmon/openstreetmap-website/blob/21edc353a4558006f0ce23f5ec3930be6a7d4c8b/app/controllers/routing_controller.rb#L153

MapQuestEngine = function(vehicleName, vehicleParam, locale) {
    this.vehicleName = vehicleName;
    this.vehicleParam = vehicleParam;
    this.locale = locale;
    if (!locale)
        this.locale = "en";
};

MapQuestEngine.prototype.createConfig = function() {
    var that = this;
    return {
        name: "javascripts.directions.engines.mapquest_"+this.vehicleName.toLowerCase(),
        creditline: '<a href="http://www.mapquest.com/" target="_blank">MapQuest</a> <img src="http://developer.mapquest.com/content/osm/mq_logo.png">',
        draggable: false,
        _hints: {},
        MQ_SPRITE_MAP: {
            0: 1, // straight
            1: 2, // slight right
            2: 3, // right
            3: 4, // sharp right
            4: 5, // reverse
            5: 6, // sharp left
            6: 7, // left
            7: 8, // slight left
            8: 5, // right U-turn
            9: 5, // left U-turn
            10: 2, // right merge
            11: 8, // left merge
            12: 2, // right on-ramp
            13: 8, // left on-ramp
            14: 2, // right off-ramp
            15: 8, // left off-ramp
            16: 2, // right fork
            17: 8, // left fork
            18: 1  // straight fork
        },
        getRoute: function(isFinal,points) {
            var url=document.location.protocol+"//open.mapquestapi.com/directions/v2/route?key=Fmjtd%7Cluur290anu%2Crl%3Do5-908a0y";
            var from=points[0]; var to=points[points.length-1];
            url+="&from="+from.join(',');
            url+="&to="+to.join(',');
            url+="&"+that.vehicleParam;
            //url+="&locale=" + I18n.currentLocale(); //Doesn't actually work. MapQuest requires full locale e.g. "de_DE", but I18n may only provides language, e.g. "de"
            url+="&manMaps=false";
            url+="&shapeFormat=raw&generalize=0&unit=k";
            this.requestCORS(url);
        },
        gotRoute: function(router,data) {
            if (data.info.statuscode!=0) return false;
        
            var poly=[];
            var shape=data.route.shape.shapePoints;
            for (var i=0; i<shape.length; i+=2) {
                poly.push(L.latLng(shape[i],shape[i+1]));
            }
            router.setPolyline(poly);

            // data.route.shape.maneuverIndexes links turns to polyline positions
            // data.route.legs[0].maneuvers is list of turns
            var steps=[];
            var mq=data.route.legs[0].maneuvers;
            for (var i=0; i<mq.length; i++) {
                var s=mq[i];
                var d;
                var linesegstart, linesegend, lineseg;
                linesegstart = data.route.shape.maneuverIndexes[i];
                if (i==mq.length-1) {
                    d = 15;
                    linesegend = linesegstart + 1;
                } else {
                    d = this.MQ_SPRITE_MAP[s.turnType];
                    linesegend = data.route.shape.maneuverIndexes[i+1] + 1;
                }
                lineseg = [];
                for (var j=linesegstart; j<linesegend; j++) {
                    lineseg.push(L.latLng(data.route.shape.shapePoints[j*2], data.route.shape.shapePoints[j*2+1]));
                }
                steps.push([L.latLng(s.startPoint.lat, s.startPoint.lng), d, s.narrative, s.distance*1000, lineseg]);
            }
            router.setItinerary( { steps: steps, distance: data.route.distance*1000, time: data.route['time'] });
            return true;
        }
    };
};

OSM.RoutingEngines.add(true, new MapQuestEngine("Bicycle", "routeType=bicycle").createConfig());
OSM.RoutingEngines.add(true, new MapQuestEngine("Foot", "routeType=pedestrian").createConfig());
OSM.RoutingEngines.add(true, new MapQuestEngine("Car", "routeType=fastest").createConfig());
// can be: routeType=fastest|shortest|pedestrian|multimodal|bicycle