Elevator Saga

elevator.js

{
    init: function(elevators, floors) {

        // helper function to check if a floor is already queued
        function isFloorQueued(elevator, floorNum) {
            return elevator.destinationQueue.indexOf(floorNum) > -1;
        }

        function isFloorQueuedForAnyElevator(floorNum) {
            for (let e = 0; e < elevators.length; e++) {
                if (isFloorQueued(elevators[e], floorNum))
                    return true;
            }
            return false;
        }

        function getElevatorWithLeastQueue() {
            let leastQueue = 999;
            let leastQueueElevator = null;
            for (let e = 0; e < elevators.length; e++) {
                if (elevators[e].destinationQueue.length < leastQueue) {
                    leastQueue = elevators[e].destinationQueue.length;
                    leastQueueElevator = elevators[e];
                }   
            }
            return leastQueueElevator;
        }

        for(let e = 0; e < elevators.length; e++) {
            let elevator = elevators[e];

            
            elevator.on("floor_button_pressed", function(floorno) {
                if (!isFloorQueued(elevator, floorno))
                    
                    //Check if the elevator is going in the same direction as the floor button pressed
                    if (elevator.goingUpIndicator() && floorno > elevator.currentFloor() || elevator.goingDownIndicator() && floorno < elevator.currentFloor())
                        elevator.goToFloor(floorno, true);
                    else
                        elevator.goToFloor(floorno);
            })

          

            // Whenever the elevator is idle (has no more queued destinations) ...
            elevator.on("idle", function() {


            });
        }

          // iterate through all floors
          for(let i = 0; i < floors.length; i++) {
            var floor = floors[i];
            floor.on("up_button_pressed", function() {
                if (!isFloorQueuedForAnyElevator(floors[i].floorNum()))
                    getElevatorWithLeastQueue().goToFloor(floors[i].floorNum());
            });

            floor.on("down_button_pressed", function() {
                if (!isFloorQueuedForAnyElevator(floors[i].floorNum()))
                    getElevatorWithLeastQueue().goToFloor(floors[i].floorNum());
            });
        }


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