package example.localplugin;

import gridsim.Gridlet;
import gridsim.gssim.ResourceHistoryItem;
import gridsim.gssim.SubmittedTask;

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

import schedframe.resources.units.ResourceUnit;
import schedframe.scheduling.TaskInterface;
import schedframe.scheduling.events.SchedulingEvent;
import schedframe.scheduling.events.TaskFinishedEvent;
import schedframe.scheduling.plugin.grid.ModuleList;
import schedframe.scheduling.utils.ResourceParameterName;
import test.rewolucja.GSSIMJobInterface;
import test.rewolucja.energy.profile.PStateType;
import test.rewolucja.resources.ProcessingElements;
import test.rewolucja.resources.ResourceStatus;
import test.rewolucja.resources.manager.implementation.ClusterResourceManager;
import test.rewolucja.resources.manager.interfaces.ResourceManagerInterface;
import test.rewolucja.resources.physical.base.ComputingResource;
import test.rewolucja.resources.physical.implementation.CPU;
import test.rewolucja.scheduling.JobRegistryInterface;
import test.rewolucja.scheduling.plan.SchedulingPlanInterfaceNew;
import test.rewolucja.scheduling.plan.SchedulingPlanNew;
import test.rewolucja.scheduling.queue.GSSIMQueue;
import test.rewolucja.scheduling.queue.QueueList;

public class FCFSCPUFreqScalingClusterLocalPlugin extends BaseLocalPlugin {

	public FCFSCPUFreqScalingClusterLocalPlugin () {
	}

	public SchedulingPlanInterfaceNew schedule(SchedulingEvent event, QueueList queues, JobRegistryInterface jobRegistry,
			ResourceManagerInterface resManager, ModuleList modules) {

		ClusterResourceManager resourceManager = (ClusterResourceManager) resManager;
		SchedulingPlanNew plan = new SchedulingPlanNew();
		// our tasks are placed only in first queue (see
		// BaseLocalPlugin.placeTasksInQueues() method)
		GSSIMQueue q = queues.get(0);
		// chose the events types to serve.
		// Different actions for different events are possible.
		switch (event.getType()) {
		
		case START_TASK_EXECUTION:

			// check all tasks in queue
			for (int i = 0; i < q.size(); i++) {
				GSSIMJobInterface<?> job = q.get(i);
				TaskInterface<?> task = (TaskInterface<?>) job;
				// if status of the tasks in READY
				if (task.getStatus() == Gridlet.READY) {

					Map<ResourceParameterName, ResourceUnit> choosenResources = chooseResourcesForExecution(resourceManager, task);
					if (choosenResources  != null) {
						addToSchedulingPlan(plan, task, choosenResources);
						ProcessingElements pes = (ProcessingElements)choosenResources.get(ResourceParameterName.PROCESSINGELEMENTS);
						List<CPU> processors =  new ArrayList<CPU>();
						for(ComputingResource res : pes){
							processors.add((CPU) res);
						}
						adjustFrequency(ResourceStatus.BUSY,processors);
					} 
				}
			}
			break;
			
		case TASK_FINISHED:
			TaskFinishedEvent finEvent = (TaskFinishedEvent) event;
			SubmittedTask subTask = jobRegistry.getSubmittedTask(finEvent.getJobId(), finEvent.getTaskId());
			List<ResourceHistoryItem> usedResourcesList = subTask.getUsedResources();
			ProcessingElements pes = (ProcessingElements)usedResourcesList.get(usedResourcesList.size() - 1).getResourceUnits().get(ResourceParameterName.PROCESSINGELEMENTS);
			List<CPU> processors =  new ArrayList<CPU>();
			for(ComputingResource res : pes){
				processors.add((CPU) res);
			}
			adjustFrequency(ResourceStatus.FREE, processors);
			break;
			
		case TASK_REQUESTED_TIME_EXPIRED:
			// check all tasks in queue
			for (int i = 0; i < q.size(); i++) {
				GSSIMJobInterface<?> job = q.get(i);
				TaskInterface<?> task = (TaskInterface<?>) job;
				// if status of the tasks in READY
				if (task.getStatus() == Gridlet.READY) {

					Map<ResourceParameterName, ResourceUnit> choosenResources = chooseResourcesForExecution(resourceManager, task);
					if (choosenResources  != null) {
						addToSchedulingPlan(plan, task, choosenResources);
						 pes = (ProcessingElements)choosenResources.get(ResourceParameterName.PROCESSINGELEMENTS);
						processors =  new ArrayList<CPU>();
						for(ComputingResource res : pes){
							processors.add((CPU) res);
						}
						adjustFrequency(ResourceStatus.BUSY,processors);
					} 
				}
			}
			break;
		}
		return plan;
	}
	
	private HashMap<ResourceParameterName, ResourceUnit> chooseResourcesForExecution(
			ClusterResourceManager resourceManager, TaskInterface<?> task) {

		HashMap<ResourceParameterName, ResourceUnit> map = new HashMap<ResourceParameterName, ResourceUnit>();

		int cpuRequest;
		try {
			cpuRequest = Double.valueOf(task.getCpuCntRequest()).intValue();
		} catch (NoSuchFieldException e) {
			cpuRequest = 1;
		}

		if (cpuRequest != 0) {
			List<ComputingResource> choosenResources = null;
			List<CPU> processors = resourceManager.getProcessors();
			if (processors.size() < cpuRequest) {
				// log.warn("Task requires more cpus than is availiable in this resource.");
				return null;
			}

			choosenResources = new ArrayList<ComputingResource>();

			for (int i = 0; i < processors.size() && cpuRequest > 0; i++) {
				if (processors.get(i).getStatus() == ResourceStatus.FREE) {
					choosenResources.add(processors.get(i));
					cpuRequest--;
				}
			}
			if (cpuRequest > 0) {
				// log.info("Task " + task.getJobId() + "_" + task.getId() +
				// " requires more cpus than is availiable in this moment.");
				return null;
			}

			ProcessingElements result = new ProcessingElements(processors.get(0).getParent().getParent().getName());
			result.addAll(choosenResources);
			map.put(ResourceParameterName.PROCESSINGELEMENTS, result);
		}
		return map;
	}

	private void adjustFrequency(ResourceStatus status, List<CPU> processors){
		switch(status){
		case BUSY:
			for(CPU cpu: processors){
				cpu.getPowerInterface().setPState(PStateType.P0);
			}
			break;
		case FREE:
			for(CPU cpu: processors){
				cpu.getPowerInterface().setPState(PStateType.P3);
			}
			break;
		}
	}
	
	public String getName() {
		return getClass().getName();
	}

	public void init(Properties properties) {
		// no extra initialization is expected.
	}

}