solution_elevator_saga.js

{
    init: function(elevators, floors) {
        var upQueue = [], downQueue = [], pressedButtons = [];

        elevators.forEach(function(elevator) {
             
            console.log('max', elevator.maxPassengerCount());
            elevator.clearDestination = function() {
                this.destinationQueue = [];
                this.checkDestinationQueue();
            }

            elevator.on("idle", function() {

                console.log('idle',this.currentFloor(), upQueue, downQueue);

                if (this.goingUpIndicator() && upQueue.length > 0) {
                    var toFloor = upQueue.shift();
                    this.goToFloor(toFloor, true);


                } else if(upQueue.length > 0) {
                    var toFloor = upQueue.pop();
                    this.goToFloor(toFloor, true);


                }

                if (this.goingDownIndicator() && downQueue.length > 0) {
                    var toFloor = downQueue.shift();
                    this.goToFloor(toFloor, true);


                } else if(downQueue.length > 0) {
                    var toFloor = downQueue.pop();
                    this.goToFloor(toFloor, true);

                }

                this.goToFloor(0);
            });

            elevator.on("floor_button_pressed", function(floorNum) {
                if (pressedButtons.indexOf(floorNum) == -1) {
                    pressedButtons.push(floorNum);
                }
                if (this.getPressedFloors().length == 1) {
                    this.goToFloor(floorNum, true);
                } else {
                    this.goToFloor(floorNum);
                }
            });

            elevator.on("passing_floor", function(floorNum, direction) { 
                if (this.getPressedFloors().indexOf(floorNum) != -1) {
                    this.goToFloor(floorNum, true);
                    console.log('passing_floor', floorNum, this.getPressedFloors());
                }

                if (
                    this.goingUpIndicator() 
                    && direction == 'up' 
                    && this.loadFactor != 1
                    && upQueue.indexOf(floorNum) != -1
                ) {
                    upQueue.splice(upQueue.indexOf(floorNum), 1);
                    this.goToFloor(floorNum, true);
                }

                if (
                    this.goingDownIndicator() 
                    && direction == 'down' 
                    && this.loadFactor != 1
                    && downQueue.indexOf(floorNum) != -1
                ) {
                    downQueue.splice(downQueue.indexOf(floorNum), 1);
                    this.goToFloor(floorNum, true);
                }
            });

            elevator.on("stopped_at_floor", function(floorNum) {
                pressedButtons.splice(pressedButtons.indexOf(floorNum));
                if (this.loadFactor == 0) {
                    this.clearDestination();
                }
            })
        });

        floors.forEach(function(floor){
            floor.on("up_button_pressed", function() { 
                if (upQueue.indexOf(this.floorNum()) == -1 && pressedButtons.indexOf(this.floorNum()) == -1) {
                    upQueue.push(this.floorNum());
                }
            });

            floor.on("down_button_pressed", function() {
                if (downQueue.indexOf(this.floorNum()) == -1 && pressedButtons.indexOf(this.floorNum()) == -1) {
                    downQueue.push(this.floorNum());
                }
            });

        });


    },
        update: function(dt, elevators, floors) {
            // We normally don't need to do anything here
        }
}