elevator.js

{
	init: function(elevators, floors) {
		function contains(array, item) {
			var i = array.length;
			while (i--) {
				if (array[i] === item) {
					return true;
				}
			}
			return false;
		};
		function remove(array, item) {
			var i = array.length;
			while (i--) {
				if (array[i] === item) {
					array.splice(i, 1);
				}
			}
		};
		var upQueue = [];
		var downQueue = [];
		var idleElevators = [];
		function sortDestination(elevator) {
			elevator.destinationQueue.sort(function(a, b){return a-b});
			if (elevator.goingUpIndicator()) {
				for (var i = 0; i < elevator.destinationQueue.length; i++) {
					if (elevator.destinationQueue[0] < elevator.currentFloor()) {
						elevator.destinationQueue.push(elevator.destinationQueue.shift());
					}
				}
			}
			if (elevator.goingDownIndicator()) {
				elevator.destinationQueue.reverse();
				for (var i = 0; i < elevator.destinationQueue.length; i++) {
					if (elevator.destinationQueue[0] > elevator.currentFloor()) {
						elevator.destinationQueue.push(elevator.destinationQueue.shift());
					}
				}
			}
			elevator.checkDestinationQueue();
		}
		function updateIndicator(elevator) {
			if (elevator.destinationQueue.length == 0) {
				elevator.goingUpIndicator(true);
				elevator.goingDownIndicator(true);
			} else {
				if (elevator.destinationQueue[0] > elevator.currentFloor()) {
					elevator.goingUpIndicator(true);
					elevator.goingDownIndicator(false);
				}
				if (elevator.destinationQueue[0] < elevator.currentFloor()) {
					elevator.goingUpIndicator(false);
					elevator.goingDownIndicator(true);
				}
			}
		}
		function digest() {
			downQueue.sort(function(a, b){return a-b});
			downQueue.reverse();
			upQueue.sort(function(a, b){return a-b});
			if (idleElevators.length > 0) {
				if (downQueue.length > 0) {
					var e = idleElevators.shift();
					var f = downQueue.shift();
					e.goToFloor(f);
				}
			}
			if (idleElevators.length > 0) {
				if (upQueue.length > 0) {
					var e = idleElevators.shift();
					var f = upQueue.shift();
					e.goToFloor(f);
				}
			}
		}
		floors.forEach(function(floor) {
			floor.on("up_button_pressed", function() {
				upQueue.push(floor.floorNum());
				digest();
			});
			floor.on("down_button_pressed", function() {
				downQueue.push(floor.floorNum());
				digest();
			});
		});
		elevators.forEach(function(elevator){
			elevator.on("idle", function() {
				idleElevators.push(elevator);
				updateIndicator(elevator);
				digest();
			});
			elevator.on("floor_button_pressed", function(floorNum) {
				elevator.goToFloor(floorNum);
				updateIndicator(elevator);
				sortDestination(elevator);
			});
			elevator.on("stopped_at_floor", function(floorNum) {
				if (elevator.goingUpIndicator()) {
					remove(upQueue, floorNum);
				}
				if (elevator.goingDownIndicator()) {
					remove(downQueue, floorNum);
				}
				updateIndicator(elevator);
			});
			elevator.on("passing_floor", function(floorNum, direction) {
				if (direction == 'down') {
					if (contains(downQueue, floorNum)) {
						if (elevator.loadFactor() < 0.5) {
							elevator.goToFloor(floorNum, true);
						}
					}
				}
			});
		});
	},
	update: function(dt, elevators, floors) {
	}
}