elevatorsaga level 10 - single queue http://play.elevatorsaga.com/#challenge=10

gistfile1.js

/**
 * elevatorsaga level 10 - single queue
 * http://play.elevatorsaga.com/#challenge=10
 **/
{
    init: function(elevators, floors) {
        
         _.each(elevators, function(elevator) {
               elevator.goToFloor(0);
        });
        
        var globalWaitingQueue = [];
        
        
        
        function moveClosestElevator(elevators, level) {
            
            var availableElevators = _.filter(elevators, function(el) {
                return el.loadFactor() < 0.7;
            });
            availableElevators = _.shuffle(availableElevators);
            var byDistance = _.sortBy(availableElevators, function(elevator) {
                return elevator.level - level;
            });
            
            var found;
            if(availableElevators.length <= 2){
                found = _.find(byDistance, function(elevator) {
                    return Math.abs(elevator.level - level) <= 3;
                });
            } else {
                found = byDistance[0];
            }
            
            if (found) {
                found.goToFloor(level);
                globalWaitingQueue = _.reject(globalWaitingQueue, function (lvl) {return lvl == level});
                return true;
            }
            
            return false;
        }
        
        function workQueue() {
            globalWaitingQueue = _.uniq(globalWaitingQueue);
            console.log(globalWaitingQueue);
            if (globalWaitingQueue.length > 0) {
                var level = globalWaitingQueue[0];

                var emptyElevators = _.filter(elevators, function (elevator) {return elevator.loadFactor() == 0});
                if (emptyElevators.length > 0) {
                    // TODO get closest
                    return moveClosestElevator(emptyElevators, level);
                    
                } else {
                    //nothing to to here. queue
                    return false;
                }
            }
        }
        
        _.each(elevators, function(elevator) {
            elevator.on("idle", function() {
                if (!workQueue()) {
                    elevator.goToFloor(0);
                }
            });
            
            elevator.on("floor_button_pressed", function(floorNum) {
                elevator.goToFloor(floorNum);
                _.uniq(elevator.destinationQueue);
                //elevator.destinationQueue.sort();
                
                elevator.checkDestinationQueue();
            });
            
            elevator.on("stopped_at_floor", function(floorNum) {
                if (floorNum == 0) {
                    elevator.goingUpIndicator(true);
                    elevator.goingDownIndicator(true);   
                }
            })
            
            elevator.on("passing_floor", function(floorNum, direction) {
                if (globalWaitingQueue.length > 0) {
                    //console.log("floorNum: " + floorNum + " direction: " + direction + " elevator.currentFloor : " + elevator.currentFloor());
                    var floor = floors[floorNum];
                    if (elevator.loadFactor() < 1) {
                        if ("up") {
                            var above = _.filter(globalWaitingQueue, function(lvl) {
                                //return elevator.currentFloor() < lvl && lvl <= _.max(elevator.destinationQueue);
                                return elevator.currentFloor() < lvl;
                            });
                            if (above.length > 0) {
                                var target = above[0];
                                elevator.goToFloor(target, true);
                                globalWaitingQueue = _.reject(globalWaitingQueue, function (lvl) {return lvl == target});
                            }
                        } else if ("down") {
                            var below = _.filter(globalWaitingQueue, function(lvl) {
                               //return elevator.currentFloor() > lvl && lvl >= _.min(elevator.destinationQueue);
                                return elevator.currentFloor() > lvl;
                            });
                            if (below.length > 0) {
                                var target = below[0];
                                elevator.goToFloor(target, true);
                                globalWaitingQueue = _.reject(globalWaitingQueue, function (lvl) {return lvl == target});
                            }
                        }
                    }
                }
            });
        });
        
        _.each(floors, function(floor) {
            _.each(['up_button_pressed', 'down_button_pressed'], function(event) {
                floor.on(event, function() {
                    globalWaitingQueue.push(floor.level);
                    workQueue();
                    //console.log(globalWaitingQueue);
                });
            });
        });
        
    },
    update: function(dt, elevators, floors) {
        // We normally don't need to do anything here
    }
}