{
    init: function(elevators, floors) {

        var floorWait = floors.map( function(floor) {
            return {up:false, down: false};
        });
        function distance(a,b) {
             return Math.abs(a-b);
        }
        function addQueue(floorNum) {
            var exist = false;
            elevators.forEach( function (elevator) {
                if( elevator.destinationQueue.indexOf(floorNum) >= 0 ) {
                    exist = true;
                }
            });
            if (exist) {
                return;
            }
            var lessbusy = elevators.reduce(function (a, b) {

                if ( a.destinationQueue.length < b.destinationQueue.length ) {
                    return a;
                }
                else if ( a.destinationQueue.length > b.destinationQueue.length ) {
                    return b;
                }
                else if ( distance(a.currentFloor(), floorNum) < distance(b.currentFloor(), floorNum) ) {
                    return a;
                }
                else if ( distance(a.currentFloor(), floorNum) > distance(b.currentFloor(), floorNum) ) {
                    return b;
                }
                else {
                     return a;
                }
            });

            lessbusy.goToFloor(floorNum);
        }


        elevators.forEach( function (elevator, index) {
            elevator.on("idle", function() {
                elevator.goToFloor(index*2);
            });

            elevator.on("floor_button_pressed", function(floorNum) {
                elevator.goToFloor(floorNum, true);
            });
            elevator.on("passing_floor", function(floorNum) {
                if ( elevator.destinationQueue.indexOf(floorNum) >= 0 || (
                    !elevator.loadFactor && (
                        /*elevator.goingDownIndicator() &&*/ floorWait[floorNum].down ||
                        /*elevator.goingUpIndicator() &&*/ floorWait[floorNum].up )
                    ) ){
                    elevator.goToFloor(floorNum, true);
                    if ( elevator.goingDownIndicator() ) {
                        floorWait[floorNum].down = false;
                    }
                    else {
                        floorWait[floorNum].up = false;
                    }
                }

            });
            elevator.on("stopped_at_floor", function(floorNum) {
                elevator.destinationQueue = elevator.destinationQueue.filter( function (f) {
                   return (f !== floorNum );
                });
            });
        });

        floors.forEach(function (floor) {
           floor.on("up_button_pressed", function() {
                floorWait[floor.floorNum()].up = true;
               addQueue(floor.floorNum());
           });
           floor.on("down_button_pressed", function() {
                floorWait[floor.floorNum()].down = true;
               addQueue(floor.floorNum());
           });
        });
    },
    update: function(dt, elevators, floors) {
    }
}