/**
 * Container for a turn restriction
 *
 * @author ab
 */
package btools.mapaccess;

public final class TurnRestriction
{
  public boolean isPositive;
  public short exceptions;

  public int fromLon;
  public int fromLat;

  public int toLon;
  public int toLat;

  public TurnRestriction next;
  
  public boolean exceptBikes()
  {
    return ( exceptions & 1 ) != 0;
  }

  public boolean exceptMotorcars()
  {
    return ( exceptions & 2 ) != 0;
  }

  public static boolean isTurnForbidden( TurnRestriction first, int fromLon, int fromLat, int toLon, int toLat, boolean bikeMode, boolean carMode )
  {
    boolean hasAnyPositive = false;
    boolean hasPositive = false;
    boolean hasNegative = false;
    TurnRestriction tr = first;
    while (tr != null)
    {
      if ( ( tr.exceptBikes() && bikeMode ) || ( tr.exceptMotorcars() && carMode ) )
      {
        tr = tr.next;
        continue;
      }
      if ( tr.fromLon == fromLon && tr.fromLat == fromLat )
      {
        if ( tr.isPositive )
        {
          hasAnyPositive = true;
        }
        if ( tr.toLon == toLon && tr.toLat == toLat )
        {
          if ( tr.isPositive )
          {
            hasPositive = true;
          }
          else
          {
            hasNegative = true;
          }
        }
      }
      tr = tr.next;
    }
    return !hasPositive && ( hasAnyPositive || hasNegative );
  }

  @Override
  public String toString()
  {
    return "pos=" + isPositive + " fromLon=" + fromLon + " fromLat=" + fromLat + " toLon=" + toLon + " toLat=" + toLat;
  }
    
}