/**
 * 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;
  }

}