package test.fips.models.fpga;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import dcworms.schedframe.scheduling.ExecTask;
import schedframe.events.scheduling.SchedulingEvent;
import schedframe.resources.ResourceStatus;
import schedframe.resources.StandardResourceType;
import schedframe.resources.computing.ComputingResource;
import schedframe.resources.computing.Core;
import schedframe.resources.computing.Node;
import schedframe.resources.computing.Processor;
import schedframe.resources.computing.profiles.energy.ResourceEvent;
import schedframe.resources.computing.profiles.energy.ResourceEventType;
import schedframe.resources.units.ProcessingElements;
import schedframe.resources.units.ResourceUnit;
import schedframe.resources.units.ResourceUnitName;
import schedframe.resources.units.StandardResourceUnitName;
import schedframe.scheduling.manager.resources.ClusterResourceManager;
import schedframe.scheduling.manager.resources.ResourceManager;
import schedframe.scheduling.manager.tasks.JobRegistry;
import schedframe.scheduling.plan.SchedulingPlanInterface;
import schedframe.scheduling.plan.impl.SchedulingPlan;
import schedframe.scheduling.plugin.ModuleList;
import schedframe.scheduling.queue.TaskQueue;
import schedframe.scheduling.queue.TaskQueueList;
import schedframe.scheduling.tasks.TaskInterface;
import simulator.DataCenterWorkloadSimulator;
import eduni.simjava.Sim_system;
import example.localplugin.BaseLocalSchedulingPlugin;
import gridsim.dcworms.DCWormsTags;

public class FCFSBF_RandomPlugin extends BaseLocalSchedulingPlugin {

	private Random rand;
	
	public FCFSBF_RandomPlugin() {
		rand = new Random(175);
	}

	public SchedulingPlanInterface<?> schedule(SchedulingEvent event, TaskQueueList queues, JobRegistry jobRegistry,
			ResourceManager resManager, ModuleList modules) {

		ClusterResourceManager resourceManager = (ClusterResourceManager) resManager;
		List<Processor> cpus = resourceManager.getProcessors();
		SchedulingPlan plan = new SchedulingPlan();

		// choose the events types to serve.
		// Different actions for different events are possible.
		switch (event.getType()) {
		
		
		case START_TASK_EXECUTION:
		case TASK_FINISHED:
			// our tasks are placed only in first queue (see BaseLocalSchedulingPlugin.placeJobsInQueues() method)
			TaskQueue q = queues.get(0);
			// check all tasks in queue
			for (int i = 0; i < q.size(); i++) {
				TaskInterface<?> task = q.get(i);
				// if status of the tasks in READY
				if (task.getStatus() == DCWormsTags.READY) {
					Map<ResourceUnitName, ResourceUnit> choosenResources = chooseResourcesForExecution(cpus, task);
					if (choosenResources != null) {
						addToSchedulingPlan(plan, task, choosenResources);
					} 
				}
			}

			break;

		}	
		return plan;
	}
	

	private Map<ResourceUnitName, ResourceUnit> chooseResourcesForExecution(
			List<Processor> cpus, TaskInterface<?> task) {

		Map<ResourceUnitName, ResourceUnit> map = new HashMap<ResourceUnitName, ResourceUnit>(1);

		int cpuRequest;
		try {
			cpuRequest = Double.valueOf(task.getCpuCntRequest()).intValue();
		} catch (NoSuchFieldException e) {
			cpuRequest = 0;
		}



		
		if (cpuRequest != 0) {



			List<ComputingResource> choosenResources = new ArrayList<ComputingResource>(cpuRequest);				
			for (int i = 0; i < cpus.size() && cpuRequest > 0; i++) {
				if (cpus.get(i).getStatus() == ResourceStatus.FREE) {
					choosenResources.add(cpus.get(i));
					cpuRequest--;
				}
			}
			if (cpuRequest > 0) {
				return null;
			}

			ProcessingElements pe = new ProcessingElements();
			pe.addAll(choosenResources);
			map.put(StandardResourceUnitName.PE, pe);
			return map;
		}

		return null;
	}


	private List<Node> filterNodes(List<Node> nodes, int cpuRequest){
		List<Node> filteredNodes = new ArrayList<Node>();

		for (Node node : nodes) {

			if (cpuRequest != 0) {

				List<Processor> cpus = node.getProcessors();
				if (cpus.size() < cpuRequest) {
					if(cpus.size() == 0){
						if(node.getProcessors().size() < cpuRequest)
							continue;
					}
				}

				int freeCpus = 0;
				for(Processor cpu: cpus){
					if(cpu.getStatus() == ResourceStatus.FREE)
						freeCpus++;
				}
				
				if(freeCpus < cpuRequest)
					continue;
				
				filteredNodes.add(node);
			}
		}
		
		return filteredNodes;
	}
	

	private Node chooseRandomNode(List<Node> nodes) {
		int nodeIdx = rand.nextInt(nodes.size());
		return nodes.get(nodeIdx);
	}


}