package example.localplugin;

import gridsim.Gridlet;
import gridsim.gssim.SubmittedTask;
import gssim.schedframe.scheduling.ExecTaskInterface;

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

import schedframe.resources.PowerState;
import schedframe.resources.units.Memory;
import schedframe.resources.units.ResourceUnit;
import schedframe.scheduling.TaskInterface;
import schedframe.scheduling.events.SchedulingEvent;
import schedframe.scheduling.plugin.grid.ModuleList;
import schedframe.scheduling.utils.ResourceParameterName;
import test.rewolucja.GSSIMJobInterface;
import test.rewolucja.resources.ProcessingElements;
import test.rewolucja.resources.ResourceStatus;
import test.rewolucja.resources.ResourceType;
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.resources.physical.implementation.ComputingNode;
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 FCFSClusterLocalPlugin extends BaseLocalPlugin {

	public FCFSClusterLocalPlugin() {
	}

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

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

					SubmittedTask subTask = (SubmittedTask) task;
					
					/****************3 ways to schedule task****************/
					
					//1. Choosing particular resources to perform execution
					Map<ResourceParameterName, ResourceUnit> choosenResources = chooseResourcesForExecution(resourceManager, subTask);
					if (choosenResources != null) {
						addToSchedulingPlan(plan, task, choosenResources);
					}
					
					//2. Choosing resource scheduler/provider to submit task.  If the given resource doesn't contains/isn't 
					//a scheduler, random resources from the given resource will be chosen in order to perform execution
					/*String provName = chooseProviderForExecution(resourceManager);
					if (provName != null) {
						addToSchedulingPlan(plan, task, provName);
					}*/

					//3. Scheduler will choose random resources to perform execution
					//addToSchedulingPlan(plan, task);

				}
			}

			break;
		}
		return plan;
	}

	private HashMap<ResourceParameterName, ResourceUnit> chooseResourcesForExecution(
			ClusterResourceManager resourceManager, ExecTaskInterface 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 = null;
			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().getName());
			result.addAll(choosenResources);
			map.put(ResourceParameterName.PROCESSINGELEMENTS, result);

		}
		int memoryRequest;
		try {
			memoryRequest = Double.valueOf(task.getMemoryRequest()).intValue();
		} catch (NoSuchFieldException e) {
			memoryRequest = 0;
		}
		if (memoryRequest != 0) {
			List<ComputingNode> nodes = resourceManager.getComputingNodes();

			Memory memory = null;
			for (ComputingNode node : nodes) {

				if (node.getFreeMemory() >= memoryRequest) {
					memory = new Memory(node.getMemory(), memoryRequest, memoryRequest);
				} else
					return null;
			}
			map.put(ResourceParameterName.MEMORY, memory);
		}

		return map;
	}

	private String chooseProviderForExecution(ResourceManagerInterface unitsManager) {
		List<ComputingResource> processingElements;
		Properties properties = new Properties();
		properties.setProperty("type", ResourceType.COMPUTING_NODE.toString());
		// properties.setProperty("status", ResourceStatus.FREE.toString());
		processingElements = (List<ComputingResource>) unitsManager.filterResources(properties);
		return processingElements.get(0).getName();
	}

	public String getName() {
		return getClass().getName();
	}

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

}