// Copyright 1999 Regents of The University of Michigan
// This makes all public classes defined for the simulator package available
import umich.coabs.simulator.*;

/**

This class is a decision maker that controls the group of evacuees
in its entities list.  When the evacuee is not at a destination,
this decision maker boards the evacuee on a transport.  When the
transport arrives at a destination for the evacuee, it disembarks
the evacuee.

@author Brad Clement, bradc@umich.edu
*/
public class DecisionMakerForEvacuees extends DecisionMaker {
	int state = 0;
/**

Just passes basics up to the costructor of the parent class, <tt>DecisionMaker</tt>

*/
public DecisionMakerForEvacuees(String i, LinkedList e, Control c) {
	super(i, e, c);
}
/**

This is the method that is called on each decision cycle by the Control
object of the simulator.  It controls the behavior of all evacuees in
its <tt>entities</tt> list.  Sometimes the evacuees will not successfully
embark or disembark a transport because the transport starts to move
out of a location.  The results of these action failures are defined in 
the Evacuee class.  The default is nothing changes, and a message is printed.

*/
public void TakeStep() {
	ListElement elem;
	int i, n;
	Transport t;
	Location l;
	Evacuee e;
	boolean done = true;  // The decision maker is done when all evacuees in its entity list are in safety locations
	
	// Cycle through the list of entities
	for (elem = entities.head; elem != null; elem = elem.next) {
		e = (Evacuee) elem.data;
		// if the evacuee, e, is currently not in a transport
		if (e.getCurTransport() == null) {
			// if e is not at one of its safety destinations
			if (e.getDestinations().Find(e.getCurLocation()) == null) {
				// If there is at least one transport here, embark the first one in the list (head.data)
				if (e.getCurLocation().getTransports().size > 0) {
					// Calls to an entity's actions are made directly, but the result is spread
					// out over the duration of the actions' executions
					e.Embark((Transport) e.getCurLocation().getTransports().head.data);
				}
				// Cannot be done, yet, since this evacuee hasn't reached a safety location
				done = false;
			}
		// e is in a transport
		} else {
			// Not done, yet, since's an evacuee travelling in a transport
			done = false;
			// If the transport is at a safety destination, e disembarks
			if (e.getCurLocation() != null)
				if (e.getDestinations().Find(e.getCurLocation()) != null) {
					e.Disembark();
				}
		}
	}
	// Stop the control loop of the simulator when all evacuees are at destinations
	if (done) {
		System.out.println("Mission accomplished!");
		ctrl.StopSimulator();
	}
}
}