lift8.js

{
  init: function(elevators, floors) {
    var waitingFloors = [];
    var goOnIdle = function(elevator, floor) {
      if (elevator.destinationDirection === "stopped") {
        elevator.goToFloor(floor.floorNum());
        return true;
      }

      return false;
    };

    var stopByUp = function(elevator, floor) {
      if (elevator.destinationDirection === "up" && elevator.currentFloor() < floor.floorNum()) {
        elevator.destinationQueue.push(floor.floorNum());
        elevator.checkDestinationQueue();
        return true;
      }

      return false;
    };

    var stopByDown = function(elevator, floor) {
      if (elevator.destinationDirection === "down" && elevator.currentFloor() > floor.floorNum()) {
        elevator.destinationQueue.push(floor.floorNum());
        elevator.destinationQueue.sort(sortDest(elevator));
        elevator.checkDestinationQueue();
        return true;
      }

      return false;
    };

    var sortDest = function(elevator) {
      return function(a, b){ 
        if (elevator.destinationDirection() === "up") {
          return a - b; 
        } else if (elevator.destinationDirection() === "down") {
          return b - a;
        }
      };
    };

    elevators.forEach(function (elevator) {
      // Whenever the elevator is idle (has no more queued destinations) ...
      elevator.on("idle", function() {
        if (waitingFloors.length > 0) {
          elevator.goToFloor(waitingFloors.pop());
        }
      });

      elevator.on("floor_button_pressed", function(floorNum) {
        var qf = elevator.getPressedFloors();
        if (qf.length > 0 && elevator.destinationQueue.indexOf(floorNum) > -1) {
          elevator.destinationQueue.push(floorNum);
          elevator.destinationQueue.sort(sortDest(elevator));
          elevator.checkDestinationQueue();
        } else {
          elevator.goToFloor(floorNum); 
        }
      });
    });

    floors.forEach(function(floor) {
      floor.on("up_button_pressed", function() {
        var moveSucceed = false;
        elevators.forEach(function (el) {
          if (!moveSucceed) {
            moveSucceed = goOnIdle(el, floor);
          }
          if (!moveSucceed) {
            moveSucceed = stopByUp(el, floor);
          }
          waitingFloors.push(floor.floorNum());
        });
      });

      floor.on("down_button_pressed", function() {
        var moveSucceed = false;
        elevators.forEach(function (el) {
          if (!moveSucceed) {
            moveSucceed = goOnIdle(el, floor);
          }
          if (!moveSucceed) {
            moveSucceed = stopByUp(el, floor);
          }
          waitingFloors.push(floor.floorNum());
        });
      });
    });

  },

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