package example.globalplugin;

import java.util.Comparator;
import java.util.List;
import java.util.Random;

import schedframe.events.scheduling.SchedulingEvent;
import schedframe.scheduling.SchedulerDescription;
import schedframe.scheduling.manager.resources.ResourceManager;
import schedframe.scheduling.manager.tasks.JobRegistry;
import schedframe.scheduling.plan.SchedulingPlanInterface;
import schedframe.scheduling.plan.impl.Allocation;
import schedframe.scheduling.plan.impl.ScheduledTask;
import schedframe.scheduling.plan.impl.SchedulingPlan;
import schedframe.scheduling.plugin.Module;
import schedframe.scheduling.plugin.ModuleList;
import schedframe.scheduling.plugin.grid.ResourceDiscovery;
import schedframe.scheduling.queue.TaskQueue;
import schedframe.scheduling.queue.TaskQueueList;
import schedframe.scheduling.tasks.TaskInterface;

public class GridFCFSRandomPlugin extends BaseGlobalPlugin {

	private Random rand;
	
	public GridFCFSRandomPlugin() {
		rand = new Random(5);
	}
	
	public SchedulingPlanInterface<?> schedule(SchedulingEvent event,
			TaskQueueList queues, 
			JobRegistry jobRegistry,
			ResourceManager resourceManager, ModuleList modules)  {
		
		ResourceDiscovery resources = null;
		for(int i = 0; i < modules.size(); i++){
			Module m = modules.get(i);
			switch(m.getType()){
				case RESOURCE_DISCOVERY: resources = (ResourceDiscovery) m;
					break;
			}
		}
		
		SchedulingPlan plan = new SchedulingPlan();
		
		TaskQueue q = queues.get(0);
		int size = q.size();
		
		// order of the resources on this list is not determined
		List<SchedulerDescription> availableResources = resources.getResources(null);
		availableResources.sort(new SchedulerDescriptionComparator());
		int resourceIdx = -1;
		
		for(int i = 0; i < size; i++) {

			TaskInterface<?> task = q.remove(0);
			
			resourceIdx = rand.nextInt(availableResources.size());
			SchedulerDescription sd = availableResources.get(resourceIdx);
			Allocation allocation = new Allocation();
			allocation.setProcessesCount(1);
			allocation.setProviderName(sd.getProvider().getProviderId());
			
			ScheduledTask scheduledTask = new ScheduledTask(task);
			scheduledTask.setTaskId(task.getId());
			scheduledTask.setJobId(task.getJobId());
			scheduledTask.addAllocation(allocation);		
			
			plan.addTask(scheduledTask);

		}
		return plan;
		
	}

}

class SchedulerDescriptionComparator implements Comparator<SchedulerDescription>{

	@Override
	public int compare(SchedulerDescription o1, SchedulerDescription o2) {
		return(o1.getProvider().getProviderId().compareTo(o2.getProvider().getProviderId()));
	}
}