/*
 * 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.modularosm.attraction;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.LinkedList;
import org.apache.commons.io.IOUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import de.tud.kom.p2psim.impl.topology.movement.modularosm.GPSCalculation;
import de.tudarmstadt.maki.simonstrator.api.util.XMLConfigurableConstructor;

/**
 * Generates attraction points out of real data from osm
 * The maximal number of attraction points can be set
 * 
 * @author Martin Hellwig
 * @version 1.0, 02.07.2015
 * 
 * Added an upper limit for the number of attraction points. Use 0 to allow all APs in the JSON file. 
 * @author Julian Zobel
 * @version 1.1, November 2018
 * 
 * You now can set an upper limit for the radius.
 * @author Julian Zobel
 * @version 1.2, January 2019
 *  
 * 
 */
public class JSONAttractionGenerator extends AbstractAttractionProvider {

	protected int numberOfAttractionPoints;
	protected String placementJsonFile = "";

	protected double maximumRadius = -1; // Values >= 0, or -1 if radius taken from file
	
	/**
	 * You have to set a json-file, which has set some POIs
	 * Sample-query for "bar"-POIs in Darmstadt (Bounding Box from [49.4813, 8.5590] to [49.9088, 8,7736]:
		http://overpass-api.de/api/interpreter?data=%5Bout:json%5D;node%5Bamenity=bar%5D%2849%2E4813%2C8%2E5590%2C49%2E9088%2C8%2E7736%29%3Bout%3B	 
	 */
	@XMLConfigurableConstructor({"numberOfAttractionPoints", "maximumRadius", "placementJsonFile"})
	public JSONAttractionGenerator(int numberOfAttractionPoints, double maximumRadius, String placementJsonFile) {						
		this.numberOfAttractionPoints = numberOfAttractionPoints;		
		this.maximumRadius = maximumRadius;
		this.placementJsonFile = placementJsonFile;		
		
		createAttractionPoints();
	}
	
	@Override
	public LinkedList<AttractionPoint> getAttractionPoints() {
		if(super.getAttractionPoints().size() == 0) {
			createAttractionPoints();
		}
		
		return super.getAttractionPoints();
	}
	
	protected JSONArray getPOIArray() {
		assert !placementJsonFile.equals("");
		
		String poiString = "";
		JSONArray allPOI = null;
		FileInputStream inputStream;
		try {
			inputStream = new FileInputStream(placementJsonFile);
			poiString = IOUtils.toString(inputStream);
			JSONObject poiData = new JSONObject(poiString);
			allPOI = poiData.getJSONArray("elements");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
	    } catch (IOException e) {
			e.printStackTrace();
		} catch (JSONException e) {
			e.printStackTrace();
		}
		
		return allPOI;
	}
	
	private void createAttractionPoints() {
		assert super.getAttractionPoints().size() == 0;
		
		JSONArray allPOI = getPOIArray();
		
		if(allPOI == null) {
			throw new UnsupportedOperationException("[JSONAttractionGenerator] POI Data Array cannot be NULL.");
		}
			
		int limit = 0;
		if(numberOfAttractionPoints == 0 || numberOfAttractionPoints > allPOI.length()) {
			limit = allPOI.length();
		}
		else {
			limit = numberOfAttractionPoints;
		}
		
		for(int i = 0; i < limit; i++) {
			try {
				String barname = allPOI.getJSONObject(i).getJSONObject("tags").getString("name");
				double lat = allPOI.getJSONObject(i).getDouble("lat");
				double lon = allPOI.getJSONObject(i).getDouble("lon");
				AttractionPoint ap;
				
				// check that the point is within the simulation boundaries
				if(GPSCalculation.isWithinGPSBoundaries(lat, lon)) {
					
					// initialize the attraction point with basic information, will be filled now...
					ap = new AttractionPoint(barname, GPSCalculation.transformGPSWindowToOwnWorld(lat, lon));
																																
					// the following setters are allowed to fail
					// AP weight
					if(allPOI.getJSONObject(i).getJSONObject("tags").has("weight")) {
						ap.setWeight(allPOI.getJSONObject(i).getJSONObject("tags").getDouble("weight"));
					}
					
					// AP radius
					if(allPOI.getJSONObject(i).getJSONObject("tags").has("radius")) {
						double radius = allPOI.getJSONObject(i).getJSONObject("tags").getDouble("radius");
						
						if(maximumRadius == -1) {
							ap.setRadius(radius);
						}
						else {
							ap.setRadius(Math.min(maximumRadius, radius));
						}
					}
					
					if(allPOI.getJSONObject(i).getJSONObject("tags").has("pauseTimeMin") && allPOI.getJSONObject(i).getJSONObject("tags").has("pauseTimeMax")) {
						ap.setPauseTime( allPOI.getJSONObject(i).getJSONObject("tags").getLong("pauseTimeMin"),  allPOI.getJSONObject(i).getJSONObject("tags").getLong("pauseTimeMax"));
					}		
					
					addAttractionPoint(ap);
				}
			}
			catch (JSONException e) {
				//This bar had no name defined, so there was an error. Not so bad
				System.out.println(e);
			}					
		}			
	}	
}