Elevator Saga Solution

ess.js

{
    init: function(elevators, floors) {
        var floorsWithPassengersDown = [];
        var floorsWithPassengersUp = [];

        for (var e = 0; e < elevators.length; e++){
            elevators[e].on("idle", function() {
                var floorsWithPassengers = floorsWithPassengersDown.concat(floorsWithPassengersUp);
                var currentFloor = this.currentFloor();
                var floorNum = 0;
                
                if (floorsWithPassengers.length > 0) {
                    var closestFloor = floorsWithPassengers.reduce(function (prev, curr) {
                        return (Math.abs(curr - currentFloor) < Math.abs(prev - currentFloor) ? curr : prev);
                    });
                    floorNum = closestFloor;
                    removeFloorFromPassengersOnFloor(floorNum);
                }
                
                this.goToFloor(floorNum);
                /*
                var floorNumber = 0;
                // go to a floor with passengers
                if(floorsWithPassengers.length > 0){
                    var sorted = floorsWithPassengers.sort();
                    floorNumber = sorted[sorted.length-1];
                    removeFloorFromPassengersOnFloor(floorNumber);
                }
                this.goToFloor(floorNumber);*/
            });

            elevators[e].on("passing_floor", function(floorNum, direction) {
                
                // below 0.7 there might be place for another passenger
                if(this.loadFactor() < 0.7){

                    if(direction === "up"){
                        // if the elevator is going UP
                        // we only pick up from floors where people want to go UP
                        if(passengersOnFloorUp(floorNum)){
                            // if there are passengers, make next stop that floor
                            this.destinationQueue.unshift(floorNum);
                            this.checkDestinationQueue();
                            // dont let other elevators go there
                            removeFloorFromPassengersOnFloor(floorNum);
                        }
                    }

                    if(direction === "down"){
                        // if the elevator is going DOWN
                        // we only pick up from floors where people want to go DOWN
                        if(passengersOnFloorDown(floorNum)){
                            // if there are passengers, make next stop that floor
                            if (this.destinationQueue.filter(function (x,i,a) { return x === 0; }).length < 2) {
                                this.destinationQueue.unshift(floorNum);
                                this.checkDestinationQueue();
                                // dont let other elevators go there
                                removeFloorFromPassengersOnFloor(floorNum);
                            }
                        }
                    }
                }
            });

            elevators[e].on("floor_button_pressed", function(floorNum) {
                console.log("Elevator " + e + ": floor pressed on " + floorNum);
                // @todo: SORT the destinationQueue starting at the current floor, in direction that we are moving first
                // That is: direction: down, currentfloor: 3
                // Order: 2 1 0 1 2 3 4 5 (etc.)
                this.destinationQueue.push(floorNum);
                console.log("Elevator " + e + ": destinationQueue " + this.destinationQueue);
                this.destinationQueue.sort();
                
                console.log("Elevator " + e + ": current floor " + this.currentFloor());
                var self = this;
                var x = this.destinationQueue.findIndex(function(e, i, a) {
                    return e >= self.currentFloor();
                });
                
                if (x === -1) {
                    this.destinationQueue.reverse();
                    console.log("Elevator " + e + ": Nothing above, going down with " + this.destinationQueue);
                }
                else if (this.goingUpIndicator()) {
                    this.destinationQueue = this.destinationQueue.slice(x).concat(this.destinationQueue.slice(0, x).reverse());
                    console.log("Elevator " + e + ": Going up with " + this.destinationQueue);
                }
                else {
                    this.destinationQueue = this.destinationQueue.slice(0, x).reverse().concat(this.destinationQueue.slice(x));
                    console.log("Elevator " + e + ": Going down with " + this.destinationQueue);
                }
                
                this.checkDestinationQueue();
            });
        }

        for(var f = 0; f < floors.length; f++){
            floors[f].on('up_button_pressed', function(){
                // register passengers that want to go UP
                floorsWithPassengersUp.push(this.level);
            });

            floors[f].on('down_button_pressed', function(){
                // register passengers that want to go DOWN
                floorsWithPassengersDown.push(this.level);
            });
        }

        function passengersOnFloorUp(floorNumber){
            // Are there passengers on the floor that want to go UP
            for(var i = 0; i < floorsWithPassengersUp.length; i++){
                if(floorsWithPassengersUp[i] == floorNumber){
                    return true;
                }
            }
        }

        function passengersOnFloorDown(floorNumber){
            // Are there passengers on the floor that want to go DOWN
            for(var i = 0; i < floorsWithPassengersDown.length; i++){
                if(floorsWithPassengersDown[i] == floorNumber){
                    return true;
                }
            }
        }

        function removeFloorFromPassengersOnFloor(floorNumber){
            // Remove the floor from registration
            for(var i = 0; i < floorsWithPassengersDown.length; i++){
                if(floorsWithPassengersDown[i] == floorNumber){
                    floorsWithPassengersDown.splice(i,1);
                }
            }

            for(var j = 0; j < floorsWithPassengersUp.length; j++){
                if(floorsWithPassengersUp[j] == floorNumber){
                    floorsWithPassengersUp.splice(j,1);
                }
            }
        }
    },
    update: function(dt, elevators, floors) {
    }
}