package au.gov.amsa.ais.rx;
   
   import java.util.HashMap;
   import java.util.Map;
   import java.util.Map.Entry;
   import java.util.TreeMap;
   
   public class CraftProperties {
   
  	private final Map<CraftPropertyName, TreeMap<Long, String>> map;
  
  	private final Mmsi mmsi;
  
  	public CraftProperties(Mmsi mmsi,
  			Map<CraftPropertyName, TreeMap<Long, String>> map) {
  		this.mmsi = mmsi;
  		this.map = map;
  	}
  
  	public CraftProperties(Mmsi mmsi) {
  		this(mmsi, new HashMap<CraftPropertyName, TreeMap<Long, String>>());
  	}
  
  	public Map<CraftPropertyName, TreeMap<Long, String>> getMap() {
  		return map;
  	}
  
  	public Mmsi getMmsi() {
  		return mmsi;
  	}
  
  	public CraftProperties add(CraftProperty p) {
  		Map<CraftPropertyName, TreeMap<Long, String>> m = new HashMap<>(map);
  		if (m.get(p.getName()) == null)
  			m.put(p.getName(), new TreeMap<Long, String>());
  		TreeMap<Long, String> tree = m.get(p.getName());
  		Entry<Long, String> before = tree.floorEntry(p.getTime());
  		Entry<Long, String> after = tree.ceilingEntry(p.getTime());
  		if (before != null && before.getValue().equals(p.getValue()))
  			return this;
  		else {
  			// replace before with p if same time
  			if (after != null && after.getValue().equals(p.getValue()))
  				tree.remove(after.getKey());
  			tree.put(p.getTime(), p.getValue());
  		}
  		return new CraftProperties(mmsi, m);
  	}
  }