package electrosphere.entity;

import org.joml.Vector3d;

import electrosphere.engine.Globals;
import electrosphere.entity.types.collision.CollisionObjUtils;
import electrosphere.server.datacell.Realm;
import electrosphere.server.datacell.ServerDataCell;
import electrosphere.server.datacell.utils.DataCellSearchUtils;
import electrosphere.server.datacell.utils.ServerBehaviorTreeUtils;

/**
 * Entity utilities specifically for the server side
 */
public class ServerEntityUtils {

    /**
     * Called when the creature is first spawned to serialize to all people in its initial chunk.
     * <p>
     * !!NOTE!!: This function must be called after the entity has fully been created.
     *   The initializeServerSideEntity logic requires knowing the type of entity (creature, foliage, etc)
     *   which is typically set further in the function than the initial "spawnServerEntity" that returns
     *   the actual Entity() object.
     * </p>
     * @param entity
     * @param position
     */
    public static void initiallyPositionEntity(Realm realm, Entity entity, Vector3d position){
        //reposition entity, if the position isn't correct then it will spawn at 0,0,0 when the synchronization part is called
        CollisionObjUtils.serverPositionCharacter(entity, position);
        //get current server data cell
        ServerDataCell cell = realm.getDataCellManager().getDataCellAtPoint(position);
        if(cell != null){
            //initialize server datacell tracking of this entity
            realm.initializeServerSideEntity(entity, cell);
        } else {
            //if it doesn't already exist, try creating it and if successfull move creature
            cell = realm.getDataCellManager().tryCreateCellAtPoint(position);
            //initialize server datacell tracking of this entity
            realm.initializeServerSideEntity(entity, cell);
        }
    }
    
    /**
     * Called to reposition the creature
     * @param entity
     * @param position
     */
    public static void repositionEntity(Entity entity, Vector3d position){
        Realm realm = Globals.realmManager.getEntityRealm(entity);
        //if server, get current server data cell
        ServerDataCell oldDataCell = realm.getDataCellManager().getDataCellAtPoint(EntityUtils.getPosition(entity));
        ServerDataCell newDataCell = realm.getDataCellManager().getDataCellAtPoint(position);
        if(oldDataCell != newDataCell){
            if(newDataCell != null){
                ServerDataCell.moveEntityFromCellToCell(entity, oldDataCell, newDataCell);
                ServerBehaviorTreeUtils.updateCell(entity, oldDataCell);
            } else {
                //if it doesn't already exist, try creating it and if successfull move creature
                newDataCell = realm.getDataCellManager().tryCreateCellAtPoint(EntityUtils.getPosition(entity));
                if(newDataCell != null){
                    ServerDataCell.moveEntityFromCellToCell(entity, oldDataCell, newDataCell);
                    ServerBehaviorTreeUtils.updateCell(entity, oldDataCell);
                }
            }
        }
        // //if the server is also a client, update the drawcell manager to know to pull new chunks
        // if(Globals.RUN_CLIENT){
        //     Globals.drawCellManager.invalidateAllCells();
        //     Globals.drawCellManager.setCellX(Globals.clientPlayerData.getWorldPos().x);
        //     Globals.drawCellManager.setCellY(Globals.clientPlayerData.getWorldPos().z);
        // }
        //reposition entity
        CollisionObjUtils.serverPositionCharacter(entity, position);
    }

}