// class Elevator.java
//:Assignment 4:
//:Student Name: Duo Zhou
//:Studnet Number: 722452
/**FileName: Elevator.java
 * Date: July, 27, 2000
 * Purpose: Learn how to use JFrame, JPanel, Synchronized method, creating
 *          multithread, the basic idea of creating GUI
 * Name of Files: This assignment include Building.java, ConnectedWall.java,
 *                Elevator.java, ElevatorFrame.java, ElevatorPanel.java,
 *				  Floor.java, MailDeliveryApp.java, MailPiece.java,
 *                Position.java, Robot.java
 * Brief Discription: Nothing is changed from the original sample code, except that I add a
 *					  method to get the current floor number, for creating elevator GUI use.
 */

public class Elevator {

  private Building building;  // which building is this elevator part-of
  private int currentFloor;   // where is the elevator stationed now
  private static final int SECS_PER_FLOOR = 5; // 5 seconds to move to next floor
  //private Image robotImage;


  Elevator(Building building){ // Construct elevator for the given building
    this.building = building;
    currentFloor = Building.BASEMENT; // elevator starts at the basement or 0

  }


  // This method is invoked by Robot only if inside elevator to move to a floor
  boolean moveRobTo(int floorNum){
    if( building.getFloor( building.getRobot().getFloorNum() ).   //we have a floor
                         inElevator( building.getRobot().getPosition())
      ){
      if(currentFloor == floorNum)
        return true; // we are already at the requested floor
      try{
    	    Thread.sleep( Math.abs(currentFloor - floorNum) * Elevator.SECS_PER_FLOOR * 1000);
   		  }
   		  catch(InterruptedException e){}
      currentFloor = floorNum;  // now both elevator and Robot are at new floor
      building.getRobot().setFloor(floorNum);
      return true;
    }else // Robot not inside elevator
      return false;
  }

 boolean callFrom(int floorNum){
    if( !( building.getFloor( building.getRobot().getFloorNum() ).
                         inElevator( building.getRobot().getPosition())
         )
      ){
      if(currentFloor == floorNum)
        return true; // we are already at the requested floor
      try{
        Thread.sleep( Math.abs(currentFloor - floorNum) * Elevator.SECS_PER_FLOOR * 1000);
      }
      catch(InterruptedException e){
      }
      currentFloor = floorNum;  // now both elevator and Robot are at new floor
      return true;
    }else // Robot is inside elevator cannot override his priority in commanding
          // elevator
      return false;
  }

  public int getFloorNum() {
	  return currentFloor;
  }

}// end of class Elevator.java
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