gistfile1.txt

{ init: function(elevators, floors) {
    var floorsQueue = [];
    var UP = 'up';
    var DOWN = 'down';

    function removeFromQueue(floor) {
        if (floorsQueue.indexOf(floor) !== -1) {
            floorsQueue.splice(floor, 1);
        }
    }

    function getNextQueuedFloor(elevator) {
        var currentFloor = elevator.currentFloor();

        var prevFloor = currentFloor - 1;
        var nextFloor = currentFloor + 1;
        var reallyNext = true;
        var reallyPrev = true;

        if (prevFloor === -1) {
            prevFloor = 2;
            reallyPrev = false;
        }

        if (nextFloor === floors.length) {
            nextFloor = floors.length - 2;
            reallyNext = false;
        }

        var nearestNext = 0;
        var nearestPrev = 0;
        var nearest = -1;

        floorsQueue.forEach(function (floor) {
            if (nearest < Math.abs(floor.num - currentFloor)) {
                nearest = floor.num;
            }

            if (floor.num === nextFloor && reallyNext) {
                nearestNext++;
            }

            if (floor.num === prevFloor && reallyPrev) {
                nearestPrev++;
            }
        });

        if (nearestNext && nearestNext > nearestPrev) {
            return nearestNext;
        }

        if (nearestPrev && nearestPrev > nearestNext) {
            return nearestPrev;
        }

        return nearest;
    }

    floors.forEach(function (floor) {
        floor.on("up_button_pressed", function() {
            floorsQueue.push({num: floor.floorNum(), direction: UP});
        });
        floor.on("down_button_pressed", function() {
            floorsQueue.push({num: floor.floorNum(), direction: DOWN});
        });
    });

    var elevatorsPassengers = {};

    function getNextPressedFloor(elevator, id) {
        var floors = elevatorsPassengers[id] || {};
        var max = 0;
        var maxFloorNum = -1;

        Object.keys(floors).forEach(function (floorNum) {
            var count = floors[floorNum];
            if (count >= max) {
                max = count;
                maxFloorNum = floorNum;
            }
        });

        return maxFloorNum;
    }


    elevators.forEach(function (elevator, id) {
        function onStoppedAtFloor() {
            var floorNum = elevator.currentFloor();
            elevatorsPassengers[id][floorNum] = 0;
            var pressed = getNextPressedFloor(elevator, id);
            var queued = getNextQueuedFloor(elevator);

            if (pressed !== -1) {
                elevator.goToFloor(pressed);
            } else if (queued !== -1) {
                elevator.goToFloor(queued);
            }
        }

        elevatorsPassengers[id] = {};
        elevator.on('floor_button_pressed', function (floorNum) {
            removeFromQueue(floorNum);
            elevatorsPassengers[id][floorNum] = elevatorsPassengers[id][floorNum] || 0;
            elevatorsPassengers[id][floorNum]++;
            var next = getNextPressedFloor(elevator, id);
            elevator.goToFloor(next);
        });
        elevator.on("passing_floor", function(floor) {
            if (elevator.loadFactor() < 0.6) {
                if (floorsQueue.map(function (floor) {
                    return floor.num;
                }).indexOf(floor.num) !== -1) {
                    elevator.stop();
                }
            }
        });
        elevator.on("stopped_at_floor", function(floorNum) {
            onStoppedAtFloor();
        });
        onStoppedAtFloor();
    });
}, update: function(dt, elevators, floors) {  } }