package au.gov.amsa.gt;
   
   import java.io.InputStreamReader;
   import java.util.Map;
   import java.util.stream.Stream;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
  import au.gov.amsa.streams.Strings;
  
  public class Shapes {
  
  	private static final Logger log = LoggerFactory.getLogger(Shapes.class);
  
  	private final Map<String, Shapefile> shapes;
  
  	public Shapes() {
  		this("/shapes.txt");
  	}
  
  	public Shapes(String resource) {
  		InputStreamReader r = new InputStreamReader(
  				Shapes.class.getResourceAsStream(resource));
  		shapes = Strings
  				.lines(r)
  				// ignore comment lines
  				.filter(line -> !line.startsWith("#"))
  				// ignore blank lines
  				.filter(line -> line.trim().length() > 0)
  				// split by | character
  				.map(line -> line.split("\\|"))
  				// log
  				.doOnNext(items -> {
  					log.info("loading " + items[0]);
  				})
  				// build map
  				.toMap(items -> items[0].trim(),
  						items -> shapefileFromZip(items[1].trim(),
  								Double.parseDouble(items[2].trim())))
  				// go
  				.toBlocking().single();
  	}
  
  	private static Shapefile shapefileFromZip(String resource,
  			double bufferDistance) {
  		return Shapefile.fromZip(Shapes.class.getResourceAsStream(resource),
  				bufferDistance);
  	}
  
  	/**
  	 * Returns the names of those shapes that contain the given lat, lon.
  	 * 
  	 * @param lat
  	 * @param lon
  	 * @return
  	 */
  	public Stream<String> containing(double lat, double lon) {
  		return shapes.keySet().stream()
  		// select if contains lat lon
  				.filter(name -> shapes.get(name).contains(lat, lon));
  	}
  
  	public void add(String name, Shapefile shapefile) {
  		shapes.put(name, shapefile);
  	}
  
  }