Elevator Saga (Train strategy)

train.js

{
  init: function(elevators, floors) {
    var floorsWaiting = {
      up: [],
      down: []
    };

    var self = this;

    var distance = function(num1, num2) {
      return Math.abs(num1 - num2);
    };

    var uniq = function(array) {
      return array.filter( function(value, index, self) {
        return self.indexOf(value) === index;
      });
    };

    var closestNum = function(array, num) {

      closest = 0;

      array.forEach(function(candidate){
        var d = distance(candidate, num);
        var currentBestDistance = distance(closest, num);
        if (d < currentBestDistance){
          closest = candidate;
        }
      });

      return closest;
    };

    var closestFloorNumWaiting = function (elevator) {
      var allFloorsNumsWaiting = floorsWaiting['up'].concat(floorsWaiting['down']);

      return closestNum(allFloorsNumsWaiting, elevator.currentFloor());
    };

    var closestIdleElevator = function (floorNum) {
      var idles = elevators.filter(function(elevator){
        return elevator.destinationQueue.length == 0;
      });

      return idles[0];
    }

    var floorIsWaiting = function(floorNum, direction) {
      return floorsWaiting[direction].indexOf(floorNum) > -1
    }

    var addWaiting = function(floorNum, direction) {
      if (!floorIsWaiting(floorNum, direction)) {
        floorsWaiting[direction].push(floorNum);
      }
    }

    var handleCallRequest = function(floor, direction) {
      if (!floorIsWaiting(floor.level, direction)) {
        addWaiting(floor.level, direction);
      }
    };

    var handleUpRequest = function() {
      console.log('upRequest', this);
      handleCallRequest(this, 'up')
    };

    var handleDownRequest = function() {
      console.log('downRequest', this);
      handleCallRequest(this, 'down')
    };


    // bind up/down requests to all floors
    floors.forEach(function(floor){
      floor.on('up_button_pressed', handleUpRequest);
      floor.on('down_button_pressed', handleDownRequest);
    })

    var checkIdle = function() {
      var num =  closestFloorNumWaiting(this)
      console.log('idle', this, num, floorsWaiting);

      if(typeof num !== 'undefined') {
        var goingUp = (num > this.currentFloor());
        this.goingUpIndicator(goingUp);
        this.goingDownIndicator(!goingUp);
        this.goToFloor(num);
      } else {
        this.goToFloor(0);
      }
    }


    // bind elevator events
    elevators.forEach(function(elevator){

      elevator.on("floor_button_pressed", function(floorNum) {
        var goingUp = floorNum > this.currentFloor();
        if (this.destinationQueue.indexOf(floorNum) == -1) {
          this.destinationQueue.push(floorNum);
          this.destinationQueue = this.destinationQueue.sort();
          if(!goingUp){
            this.destinationQueue = this.destinationQueue.reverse()
          }
        }

        this.checkDestinationQueue()

        console.log('floor_button_pressed', floorNum, this.destinationQueue)
      })

      elevator.on("idle", checkIdle);

      elevator.on("passing_floor", function(floorNum, direction) {
        var goingUp = (direction == 'up');
        console.log('passing_floor: ' + floorNum, floorsWaiting, 'going up: ' + this.goingUpIndicator(), 'going down: ' + this.goingDownIndicator());
        var index = floorsWaiting[direction].indexOf(floorNum);

        if(index > -1) {
          this.goToFloor(floorNum, true)
          floorsWaiting[direction].splice(index, 1);
        }
      });

      elevator.on("stopped_at_floor", function(floorNum) {
        console.log('stopped_at_floor', floorNum, this.destinationQueue);
        // var index = this.destinationQueue.indexOf(floorNum);
        // if (index > -1) {
        //   this.destinationQueue.splice(index, 1);
        // }
        //
        // //at the bottom
        if (floorNum == 0) {
          this.goingUpIndicator(true);
          this.goingDownIndicator(false);
          this.goToFloor(floors.length - 1);
        }

        // //at the top
        if (floorNum == floors.length - 1) {
          this.goingDownIndicator(true);
          this.goingUpIndicator(false);
          this.goToFloor(0);
        }
      });

      elevator.goToFloor(floors.length - 1);
    });
  },

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