gistfile1.txt

{
    init: function(elevators, floors) {
        function Controller (elevator) {
            var currentController = this;
            this.elevator = elevator;
            elevator.on('floor_button_pressed', function (floorNum) {
                currentController.goToFloor(floorNum);
            });
        }

        /**
         * Get floor priority of the request to this elevator at the moment.
         * @param  {[type]} floorRequest [description]
         * @return {[type]}              [description]
         */
        Controller.prototype.getRequestPriority = function (floorRequest) {
            var priority = 1 - this.elevator.loadFactor();
            if (floorRequest.floorNum > this.elevator.currentFloor() && this.elevator.destinationDirection() === 'up') priority += 10 / Math.pow(Math.abs(floorRequest.floorNum - this.elevator.currentFloor()), 2);
            if (floorRequest.floorNum < this.elevator.currentFloor() && this.elevator.destinationDirection() === 'down') priority -= 10 / Math.pow(Math.abs(floorRequest.floorNum - this.elevator.currentFloor()), 2);
            return priority;
        };

        Controller.prototype.appendFloorRequest = function (floorRequest) {
            this.goToFloor(floorRequest.floorNum);
        };

        Controller.prototype.goToFloor = function (floorNum) {
            var currentController = this;
            this.elevator.goToFloor(floorNum);
            setTimeout(function () {
                currentController.rearrangeDestination();
            }, 0);
        };

        Controller.prototype.rearrangeDestination = function () {
            var currentController = this;

            var destinationsToSameDirection, destinationToOpposite;
            if (currentController.elevator.destinationDirection() === 'up') {
                destinationsToSameDirection = currentController.elevator.destinationQueue.filter(function (destination) {
                    return destination >= currentController.elevator.currentFloor();
                }).sort(function (lhs, rhs) {
                    return lhs > rhs;
                });
                destinationToOpposite = currentController.elevator.destinationQueue.filter(function (destination) {
                    return destination < currentController.elevator.currentFloor();
                });
            }
            else if (currentController.elevator.destinationDirection() === 'down') {
                destinationsToSameDirection = currentController.elevator.destinationQueue.filter(function (destination) {
                    return destination <= currentController.elevator.currentFloor();
                }).sort(function (lhs, rhs) {
                    return lhs < rhs;
                });
                destinationToOpposite = currentController.elevator.destinationQueue.filter(function (destination) {
                    return destination > currentController.elevator.currentFloor();
                });
            }
            else {
                return;
            }

            currentController.elevator.destinationQueue = destinationsToSameDirection.concat(destinationToOpposite);
            currentController.elevator.checkDestinationQueue();
        }

        var controllers = elevators.map(function (elevator) {
            return new Controller(elevator);
        });

        function makeFloorRequest (direction, floorNum) {
            return {
                direction: direction,
                floorNum: floorNum
            };
        }

        function dispatchFloorRequest (floorRequest) {
            var sortedControllers = controllers.map(function (controller) {
                return {
                    controller: controller,
                    priority: controller.getRequestPriority(floorRequest)
                };
            }).sort(function (lhs, rhs) {
                return lhs.priority < rhs.priority;
            }).map(function (_) {
                return _.controller;
            });

            sortedControllers[0].appendFloorRequest(floorRequest);
        }

        floors.forEach(function (floor) {
            floor.on('up_button_pressed', function () {
                dispatchFloorRequest(makeFloorRequest('up', floor.floorNum()));
            });
            floor.on('down_button_pressed', function () {
                dispatchFloorRequest(makeFloorRequest('down', floor.floorNum()));
            });
        });
    },
    update: function(dt, elevators, floors) {
        // We normally don't need to do anything here
    }
}