package schedframe.scheduling;

import java.util.Collection;
import java.util.Iterator;

import org.joda.time.DateTime;
import org.joda.time.MutableInterval;

import schedframe.resources.ResourceDescription;
import schedframe.resources.units.ResourceUnit;

/**
 * This class defines a resource allocation over time
 * It contains information about time frame and specific resources allocated
 * It may be initialized by a description of allocated resources or 
 * by a list of allocated resource units (e.g. number of CPUs, memory etc.)
 * 
 * @author Ariel
 * @author Marcin Krystek
 */
public class TimeResourceAllocation extends MutableInterval {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = -8327181428985141349L;

	/**
	 * Id of this allocation
	 */
	protected String id;

	/**
	 * Contains detail information about resource.
	 */
	protected ResourceDescription allocatedResource;

	
	protected static int uniqueID_ = -1;
	
	protected synchronized int getUniqueID(){
		uniqueID_++;
		return uniqueID_;
	}
	
	public TimeResourceAllocation(DateTime startTime, DateTime endTime) {
		super(startTime, endTime);

		allocatedResource = null;
		
		id = String.valueOf(getUniqueID());
	}
	
	public TimeResourceAllocation(ResourceDescription allocatedResource, DateTime startTime,
			DateTime endTime) {

		this(startTime, endTime);
		
		this.allocatedResource = allocatedResource;

	}

	/**
	 * Copy constructor
	 * @param alloc
	 */
	public TimeResourceAllocation(TimeResourceAllocation alloc) {
		super(alloc.getStart(), alloc.getEnd());
		this.id = alloc.getId();
		this.allocatedResource = (ResourceDescription)alloc.getAllocatedResource().clone();
	}
	
	
	
	public String getId() {
		return id;
	}


	public ResourceDescription getAllocatedResource(){
		return this.allocatedResource;
	}
	
	public void setAllocatedResource(ResourceDescription resDesc){
		this.allocatedResource = resDesc;
	}

	public String toString() {
		String start = getStart().toString("YYYY-MM-dd HH:mm:ss");
		String end = getEnd().toString("YYYY-MM-dd HH:mm:ss");
		String resources = "";
		String desc = id + " resources: " + resources + " <" + start
				+ " - " + end + ">";

		Collection<ResourceUnit> res =  this.allocatedResource.getResourceUnit();
		if (res != null) {
			Iterator<ResourceUnit> itr = res.iterator();
			while(itr.hasNext()){
				ResourceUnit unit = itr.next();
				desc += unit;
			}
		}
		return desc;
	}

	public boolean equals(Object obj) {
		if (obj instanceof TimeResourceAllocation == false)
			return false;
		
		TimeResourceAllocation other = (TimeResourceAllocation) obj;
		
		if (! id.equals(other.id)) return false;
		
		return super.equals(other);
	}
	
}