/*
 * Copyright (c) 2005-2010 KOM – Multimedia Communications Lab
 *
 * This file is part of PeerfactSim.KOM.
 * 
 * PeerfactSim.KOM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 * 
 * PeerfactSim.KOM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with PeerfactSim.KOM.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package de.tud.kom.p2psim.impl.topology.movement;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Scanner;

import de.tud.kom.p2psim.api.scenario.ConfigurationException;
import de.tud.kom.p2psim.api.topology.movement.MovementModel;
import de.tud.kom.p2psim.api.topology.movement.SimLocationActuator;
import de.tud.kom.p2psim.impl.topology.movement.modularosm.IAttractionBasedMovementAnalyzer;
import de.tud.kom.p2psim.impl.topology.movement.modularosm.attraction.IAttractionGenerator;
import de.tud.kom.p2psim.impl.topology.movement.modularosm.mapvisualization.IMapVisualization;
import de.tud.kom.p2psim.impl.topology.util.PositionVector;
import de.tud.kom.p2psim.impl.topology.views.VisualizationTopologyView.VisualizationInjector;
import de.tudarmstadt.maki.simonstrator.api.Event;
import de.tudarmstadt.maki.simonstrator.api.EventHandler;
import de.tudarmstadt.maki.simonstrator.api.Monitor;
import de.tudarmstadt.maki.simonstrator.api.Time;

public class TracefileMovementModel implements MovementModel, EventHandler {

	public static String tracefileFolder ="smarter/tracefiles/";
	public static String tracefilePrefix = "smarterTraceFile-";
	
	protected final int EVENT_MOVE = 1;
	
	protected long timeBetweenMoveOperations;

	protected IMapVisualization mapVisualization;
	protected IAttractionGenerator attractionGenerator;
	
	protected boolean initialized = false;
	
	private final LinkedHashMap<SimLocationActuator, LinkedList<Step>> components;
	
	private LinkedList<File> tracefiles;
	private boolean first = true;
	
	public TracefileMovementModel() {
		components = new LinkedHashMap<SimLocationActuator, LinkedList<Step>>();
		tracefiles = new LinkedList<File>();
	}
	
	public void initialize() {
		if(initialized) {
			return;
		}		
			
		File folder = new File(tracefileFolder);
		if (!folder.exists()) {
			throw new UnsupportedOperationException("Tracefile folder not found");			
		}
				
		for(File tracefile : folder.listFiles()) {
			if(tracefile.getName().contains(tracefilePrefix)) {
				tracefiles.add(tracefile);
			}
		}
		
		if (mapVisualization != null) {
			VisualizationInjector.injectComponent(mapVisualization);
		}
		
		initialized = true;
		
		Event.scheduleWithDelay(timeBetweenMoveOperations, this, null, EVENT_MOVE);
	}
	
	@Override
	public void eventOccurred(Object content, int type) {
		if (type == EVENT_MOVE) {
			move();
		}
	}
	
	private void move() {
		
		if(first) {		
			components.forEach((component, steps) -> {				
				component.updateCurrentLocation(new PositionVector(-1, -1));				
			});			
		}
		
		
		// as the files contain the timestamp in seconds, the current time needs to be converted in seconds
		long currentTime = Time.getCurrentTime() / Time.SECOND;

		LinkedList<SimLocationActuator> toRemove = new LinkedList<>();
		
		components.forEach((component, steps) -> {
			
			Step step = steps.peek();			
			if (step != null) {
				
				if(currentTime < step.timestamp) {
					//component.updateCurrentLocation(new PositionVector(-1, -1));											
				}
				else {					
					step = steps.pop();
					component.updateCurrentLocation(new PositionVector(step.x, step.y));					
				}				
			}
			else {
				System.out.println("Component "+component.getHost().getId()+" left the area at " + Time.getFormattedTime());
				component.updateCurrentLocation(new PositionVector(-1, -1));		
				toRemove.add(component);
			}
		});
		
		for (SimLocationActuator simLocationActuator : toRemove) {
			components.remove(simLocationActuator);
		}
		
		Event.scheduleWithDelay(timeBetweenMoveOperations, this, null, EVENT_MOVE);
		

		if(first) {
			System.out.println("first with " + components.keySet().size() + " hosts");
			
			// Inform analyzer of resolved movement
			if(Monitor.hasAnalyzer(IAttractionBasedMovementAnalyzer.class)) {			
				Monitor.getOrNull(IAttractionBasedMovementAnalyzer.class).onAllNodeInitializationCompleted(components.keySet());
			}
			
			first =false;
		}
	}

	@Override
	public void addComponent(SimLocationActuator actuator) {
		if (!initialized) {
			initialize();
		}
		
		associateTracefile(actuator);
	}

	private void associateTracefile(SimLocationActuator actuator) {
		if(tracefiles.isEmpty()) {
			throw new UnsupportedOperationException("List of tracefiles is empty, thus cannot initiate the component!");
		}
		
		if(components.containsKey(actuator)) {
			throw new UnsupportedOperationException("Component was already assigned!");
		}
		
		LinkedList<Step> stepQueue = new LinkedList<Step>(); 
		File tracefile = tracefiles.pop();		
		Scanner filescanner;
		
		try {
			filescanner = new Scanner(tracefile);		
						
			while(filescanner.hasNextLine()) {
				String line = filescanner.nextLine();
				String[] split = line.split(" ");
						
				long timestamp = Long.valueOf(split[0]);
				//double lat = Double.valueOf(split[1]);
				//double lon = Double.valueOf(split[2]);
				double x = Double.valueOf(split[3]);
				double y = Double.valueOf(split[4]);
							
				Step s = new Step(timestamp, x, y);
				stepQueue.add(s);				
			}
			
			filescanner.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		catch (Exception e) {
			System.err.println(tracefile.getName());
			e.printStackTrace();
		}
		
		System.out.println(actuator.getHost().getId() + " <> " + tracefile.getName());
		
		components.put(actuator, stepQueue);
	}
	
	@Override
	public void placeComponent(SimLocationActuator actuator) {		
		// Initial placement		
		actuator.updateCurrentLocation(new PositionVector(-1, -1));		
	}

	@Override
	public void setTimeBetweenMoveOperations(long time) {
		this.timeBetweenMoveOperations = time;		
	}

	public void setIMapVisualization(IMapVisualization mapVisualization) {
		this.mapVisualization = mapVisualization;
	}
	
	public void setIAttractionGenerator(IAttractionGenerator attractionGenerator) {
		if (attractionGenerator == null) {
			throw new ConfigurationException(
					"AttractionGenerator is missing in ModularMovementModel!");
		}
		this.attractionGenerator = attractionGenerator;
	}
	

	private class Step {

		public final double x;

		public final double y;

		public final long timestamp;

		public Step(long timestamp, double x, double y) {
			this.x = x;
			this.y = y;
			this.timestamp = timestamp;
		}
	}
	
}