package Steerings;
   
   import SteeringStuff.SteeringManager;
   import SteeringStuff.RefBoolean;
   import SteeringProperties.SteeringProperties;
   import SteeringProperties.TargetApproachingProperties;
   import SteeringProperties.Target_packet;
   import cz.cuni.amis.pogamut.base3d.worldview.object.Location;
   import javax.vecmath.Vector3d;
  import cz.cuni.amis.pogamut.ut2004.bot.impl.UT2004Bot;
  import SteeringStuff.ISteering;
  import java.util.ArrayList;
  import javax.vecmath.Tuple3d;
  
  
  /**
   * Using this steering the bot can approach one or more targets.
   *
   * @author Marki
   */
  public class TargetApproachingSteer implements ISteering {
  
      /** This steering needs botself. */
      private UT2004Bot botself;
  
      private ArrayList<Target_packet> targets = new ArrayList<Target_packet>();
  
      private static int NEARLY_THERE_DISTANCE = 150;
  
      /**
       * @param bot Instance of the steered bot.
       */
      public TargetApproachingSteer(UT2004Bot bot) {
          botself = bot;
      }
  
      /** When called, the bot starts steering, when possible, he get's nearer the target location. */
      public Vector3d run(Vector3d scaledActualVelocity, RefBoolean wantsToGoFaster, RefBoolean wantsToStop, Location focus)
      {
          // Supposed velocity in the next tick of logic, after applying various steering forces to the bot.
          Vector3d nextVelocity = new Vector3d(0,0,0);
  
          for(Target_packet tp : targets) {
  
              /** ISteering properties: target location - bot approaches this location. */
              Location targetLocation = tp.getTargetLocation();
  
              // A vector from the bot to the target location.
              Vector3d vectorToTarget = new Vector3d(targetLocation.x - botself.getLocation().x, targetLocation.y - botself.getLocation().y, 0);
  
              double distFromTarget = vectorToTarget.length();
  
              /** ISteering properties: target gravity - a parameter meaning how attracted the bot is to his target location. */
              int attractiveForce = tp.getAttractiveForce(distFromTarget);
              
              if (distFromTarget < NEARLY_THERE_DISTANCE) {
                  wantsToStop.setValue(true);
                  //if (SteeringManager.DEBUG) System.out.println("We reached the target");
              } else {
                  vectorToTarget.normalize();
                  vectorToTarget.scale(attractiveForce);
                  nextVelocity.add((Tuple3d) vectorToTarget);
              }
          }
          wantsToGoFaster.setValue(true);
          return nextVelocity;
      }
  
      public void setProperties(SteeringProperties newProperties) {
          ArrayList<Target_packet> al = ((TargetApproachingProperties)newProperties).getTargets();
          targets.clear();
          for(Target_packet tp : al) {
              targets.add(new Target_packet(tp.getTargetLocation(), tp.getForce_packet()));
          }
      }
  
      public TargetApproachingProperties getProperties() {
          TargetApproachingProperties properties = new TargetApproachingProperties();
          properties.setTargets(targets);
          return properties;
      }
  
  }