package test.article.recs.plugins.timeestimation;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;

import schedframe.events.scheduling.SchedulingEvent;
import schedframe.resources.computing.Core;
import schedframe.resources.computing.Processor;
import schedframe.resources.units.PEUnit;
import schedframe.resources.units.ProcessingElements;
import schedframe.resources.units.ResourceUnit;
import schedframe.resources.units.ResourceUnitName;
import schedframe.resources.units.StandardResourceUnitName;
import test.article.recs.utils.AppType;
import test.article.recs.utils.TaskToApp;
import dcworms.schedframe.scheduling.ExecTask;
import example.timeestimation.BaseTimeEstimationPlugin;

public class RecsTimeEstimationPlugin extends BaseTimeEstimationPlugin{

	private static String TIME_DATA_FILE_NAME = "src/test/article/recs/data/time_data.properties";
	private static int TIME_FACTOR = 20;
	
	private ResourceBundle timeBundle;
	
	private TaskToApp taskToApp = new TaskToApp();

	public double execTimeEstimation(SchedulingEvent event, ExecTask task,
			Map<ResourceUnitName, ResourceUnit> allocatedResources,
			double completionPercentage) {
		
		double execTime;
		
		PEUnit peUnit = (PEUnit) allocatedResources.get(StandardResourceUnitName.PE);
		
		String query = createQuery(task, peUnit);
		try {
			execTime = TIME_FACTOR * (1 - completionPercentage/100) * getMeasuredTime(query);
			if (Double.compare(execTime, 0.001) < 0) {
				execTime = 0.001;
			}
			execTime = Math.round(execTime);
		} catch (FileNotFoundException e) {
			execTime = defaultEstimation(task, peUnit, completionPercentage);
		} catch (IOException e) {
			execTime = defaultEstimation(task, peUnit, completionPercentage);
		} catch(MissingResourceException e){
			execTime = defaultEstimation(task, peUnit, completionPercentage);
		}

		return execTime;
	}

	private String createQuery(ExecTask task, PEUnit peUnit) {
		String query;
		query = getApplicationType(task) + "." + getNodeCategory(peUnit) + "." + getFrequency(peUnit) + "." + getCoreCnt(task);
		return query;
	}

	private String getApplicationType(ExecTask task){	
		AppType appType = taskToApp.getAppType(task);
		return appType.toString();
	}
	
	private String getNodeCategory(PEUnit peUnit){
		
		ProcessingElements pe = (ProcessingElements) peUnit;
		Core core = (Core)pe.get(0);
		return core.getParent().getParent().getCategory();
	}
	
	private int getFrequency(PEUnit peUnit){
		ProcessingElements pe = (ProcessingElements) peUnit;
		Core core = (Core)pe.get(0);
		Processor proc = (Processor) core.getParent();
		double freq;
		try{
			freq = proc.getPowerInterface().getFrequency();
		} catch(Exception e){
			freq = 800;
		}
		return Double.valueOf(freq).intValue();
		
	}
	
	private int getCoreCnt(ExecTask task){	
		double cpuReq;
		try {
			cpuReq = task.getCpuCntRequest();
		} catch (NoSuchFieldException e) {
				cpuReq = 1;
		}
		return Double.valueOf(cpuReq).intValue();
	}
	
	private double getMeasuredTime(String query) throws FileNotFoundException, IOException{
		ResourceBundle timeBundle = getTimeBundle();
		return Double.valueOf(timeBundle.getString(query)).doubleValue();
	}

	private ResourceBundle getTimeBundle() throws FileNotFoundException, IOException{
		if(timeBundle == null){
			timeBundle = new PropertyResourceBundle(new FileInputStream(TIME_DATA_FILE_NAME));
		}
		return timeBundle;
	}

	private double defaultEstimation(ExecTask task,
			PEUnit peUnit,
			double completionPercentage){
		int speed = peUnit.getSpeed();
		int cnt = peUnit.getUsedAmount();

		double remainingLength =  task.getLength() * (1 - completionPercentage/100);
		
		double execTime = (remainingLength / (cnt * speed));
		if (Double.compare(execTime, 0.001) < 0) {
			execTime = 0.001;
		}
		execTime = Math.round(execTime);
		return execTime;
	}
}