package org.hwo.ui.gantt;

import org.hwo.datetime.DateTime;

public class BaseGanttResource implements IGanttResource {

	private String shortLabel;
	private String detailedLabel;
	private int	maxParallelUsage;
	
	private ResourceAvailability resourceAvailability;
	
	public BaseGanttResource(String shortLabel,String detailedLabel) {
		this.shortLabel = shortLabel;
		this.detailedLabel = detailedLabel;
		this.maxParallelUsage = 1;
	}

	
	@Override
	public String getLabel() {
		return this.shortLabel;
	}

	@Override
	public String getDetailedLabel() {
		return this.detailedLabel;
	}
	
	
	public void setResourceAvailability(
			ResourceAvailability resourceAvailability) {
		this.resourceAvailability = resourceAvailability;
	}
	
	@Override
	public ResourceAvailability getAvailability() {
		return resourceAvailability;
	}
	
	@Override
	public ResourceAvailability getAvailability(DateTime fromDateTime) {
		return resourceAvailability.findAvailableAfter(fromDateTime);
	}
	
	@Override
	public int getMaxParallelUsage() {
		return this.maxParallelUsage;
	}

	public void setMaxParallelUsage(int maxParallelUsage) {
		this.maxParallelUsage = maxParallelUsage;
	}
	
	
	
	public DateTime calculateUsageTime(DateTime begin,int seconds){
		ResourceAvailability ra = getAvailability(begin);
		DateTime dt = new DateTime(begin); 

		if (ra != null && dt.isBefore(ra.getStartTime())){
			dt = ra.getStartTime();
		}

		while (ra != null){			
			int availSeconds = ra.getSeconds(dt);
			
			//System.err.println(String.format("RES: %s needs %d seconds from %s. Has %d seconds.", shortLabel, seconds, dt.toString(), availSeconds));
			
			if (availSeconds >= seconds){	// Soll kann erfüllt werden...
				DateTime endTime = new DateTime(dt);
				endTime.addSeconds(seconds);
				return endTime;
			}
			
			seconds -= availSeconds;
			
			ra = ra.getNext();
			dt = ra.getStartTime();
		}
		return null;
	}
	
	
}