/**
    * Copyright (c) 2011, The University of Southampton and the individual contributors.
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *
    *   * 	Redistributions of source code must retain the above copyright notice,
    * 	this list of conditions and the following disclaimer.
   *
   *   *	Redistributions in binary form must reproduce the above copyright notice,
   * 	this list of conditions and the following disclaimer in the documentation
   * 	and/or other materials provided with the distribution.
   *
   *   *	Neither the name of the University of Southampton nor the names of its
   * 	contributors may be used to endorse or promote products derived from this
   * 	software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.openimaj.demos.mediaeval13.placing;
  
  import gnu.trove.list.array.TLongArrayList;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.lucene.index.DirectoryReader;
  import org.apache.lucene.index.IndexReader;
  import org.apache.lucene.search.IndexSearcher;
  import org.apache.lucene.store.Directory;
  import org.apache.lucene.store.MMapDirectory;
  import org.openimaj.image.FImage;
  
  public class Utils {
  	private Utils() {
  	}
  
  	/**
  	 * Read the lat-lng file into a list of {@link GeoLocation}s
  	 * 
  	 * @param latlngFile
  	 * @param skipIds
  	 * @return
  	 * @throws FileNotFoundException
  	 * @throws IOException
  	 */
  	public static List<GeoLocation> readLatLng(File latlngFile, TLongArrayList skipIds) throws FileNotFoundException,
  			IOException
  	{
  		final ArrayList<GeoLocation> pts = new ArrayList<GeoLocation>();
  		BufferedReader br = null;
  		try {
  			br = new BufferedReader(new FileReader(latlngFile));
  
  			String line;
  			while ((line = br.readLine()) != null) {
  				try {
  					final String[] parts = line.split(" ");
  
  					if (parts.length != 3)
  						continue;
  
  					final long id = Long.parseLong(parts[0]);
  					final double lat = Double.parseDouble(parts[1]);
  					final double lng = Double.parseDouble(parts[2]);
  
  					if (skipIds.binarySearch(id) < 0)
  						pts.add(new GeoLocation(lat, lng));
  				} catch (final NumberFormatException nfe) {
  					// ignore line
  				}
  			}
  		} finally {
  			if (br != null)
  				br.close();
  		}
  		return pts;
  	}
  
  	public static FImage createPrior(File latlngFile, TLongArrayList skipIds) throws IOException {
  		return createPrior(latlngFile, skipIds, true);
  	}
  
  	public static FImage createPrior(File latlngFile, TLongArrayList skipIds, boolean norm) throws IOException {
 		final FImage img = new FImage(360, 180);
 		img.fill(1f / (img.height * img.width));
 
 		if (latlngFile == null)
 			return img;
 
 		final BufferedReader br = new BufferedReader(new FileReader(latlngFile));
 
 		String line;
 		br.readLine();
 		while ((line = br.readLine()) != null) {
 			final String[] parts = line.split(" ");
 
 			if (skipIds.contains(Long.parseLong(parts[0])))
 				continue;
 
 			final float x = Float.parseFloat(parts[2]) + 180;
 			final float y = 90 - Float.parseFloat(parts[1]);
 
 			img.pixels[(int) (y * img.height / 180.001)][(int) (x * img.width / 360.001)]++;
 		}
 		br.close();
 
 		if (norm)
 			logNorm(img);
 
 		return img;
 	}
 
 	public static void logNorm(final FImage img) {
 		final double norm = img.sum();
 		for (int y = 0; y < img.height; y++)
 			for (int x = 0; x < img.width; x++)
 				img.pixels[y][x] = (float) Math.log(img.pixels[y][x] / norm);
 	}
 
 	public static IndexSearcher loadLuceneIndex(File file) throws IOException {
 		final Directory directory = new MMapDirectory(file);
 		final IndexReader reader = DirectoryReader.open(directory);
 		final IndexSearcher luceneIndex = new IndexSearcher(reader);
 		return luceneIndex;
 	}
 }