/*
 * Building with elevators and people for simulation
 * Created on May 10, 2004
 * @author kim
 */

public class Building {
	// number of floors in building
	public final int NUM_FLOORS;
	// number of elevators in building
	public final int NUM_ELEVATORS;
	// array of elevators
	private Elevator[] lift;

	/**
	 * Create building with
	 * @param numFloors -- number of floors
	 * @param numElevators -- number of elevators
	 * @param elevatorCapacity -- each elevator's capacity
	 * @param serviceFloorMS -- length of time elevator should stay on floor
	 * post:  elevators start on successive floors.
	 */
	public Building(int numFloors, int numElevators,
			int elevatorCapacity, int serviceFloorMS, int travelTimeMS) {
		NUM_FLOORS = numFloors;
		NUM_ELEVATORS = numElevators;
		lift = new Elevator[numElevators];
		for (int liftNum = 0; liftNum < numElevators; liftNum++) {
			lift[liftNum] = new Elevator("lift "+liftNum, NUM_FLOORS,
					liftNum % numFloors, elevatorCapacity, this, 
					serviceFloorMS, travelTimeMS);
		}
	}
	
	// post:  start all of the elevators running
	public void startElevators(){
		for (int liftNum = 0; liftNum < NUM_ELEVATORS; liftNum++) {
			lift[liftNum].start();
		}
	}
	
	// post:  stop all of the elevators from running
	public void stopElevators(){
		for (int liftNum = 0; liftNum < NUM_ELEVATORS; liftNum++) {
			lift[liftNum].stopElevator();
		}
	}
	
	// post:  notified all of those waiting that an elevator
	//        has arrived at currentFloor
	public synchronized void tellAt() {
		notifyAll();
	}
	
	/*
	 * post: Returns the first elevator to reach the current floor that is
	 * going the right direction.  Wait if necessary for one to arrive.
	 */
	public synchronized Elevator callElevator(int personFloor, boolean goingUp){
		while (true) {
			for (int liftNum = 0; liftNum < NUM_ELEVATORS; liftNum++) {
				if(lift[liftNum].getCurrentFloor() == personFloor &&
						lift[liftNum].isGoingUp() == goingUp) {
					return lift[liftNum];
				}
			}
			try {
				wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		} 
	}
	
	public synchronized void waitForElevatorToCome() {
		try{
			wait();
		} catch  (InterruptedException e) {
			e.printStackTrace();
		}
	}
}