package common.ai;

import java.util.List;
import java.util.function.Predicate;

import common.entity.Entity;
import common.entity.types.EntityLiving;
import common.pathfinding.PathEntity;
import common.pathfinding.PathNavigate;
import common.util.Predicates;
import common.util.Vec3;

public class EntityAIAvoidEntity<T extends Entity> extends EntityAIBase
{
    private final Predicate<Entity> canBeSeenSelector;

    /** The entity we are attached to */
    protected EntityLiving theEntity;
    private double farSpeed;
    private double nearSpeed;
    protected T closestLivingEntity;
    private float avoidDistance;

    /** The PathEntity of our entity */
    private PathEntity entityPathEntity;

    /** The PathNavigate of our entity */
    private PathNavigate entityPathNavigate;
    private Class<T> classToAvoid;
    private Predicate <? super T > avoidTargetSelector;

    public EntityAIAvoidEntity(EntityLiving theEntityIn, Class<T> classToAvoidIn, float avoidDistanceIn, double farSpeedIn, double nearSpeedIn)
    {
        this(theEntityIn, classToAvoidIn, Predicates.<T>alwaysTrue(), avoidDistanceIn, farSpeedIn, nearSpeedIn);
    }

    public EntityAIAvoidEntity(EntityLiving theEntityIn, Class<T> classToAvoidIn, Predicate <? super T > avoidTargetSelectorIn, float avoidDistanceIn, double farSpeedIn, double nearSpeedIn)
    {
        this.canBeSeenSelector = new Predicate<Entity>()
        {
            public boolean test(Entity p_apply_1_)
            {
                return p_apply_1_.isEntityAlive() && EntityAIAvoidEntity.this.theEntity.getEntitySenses().canSee(p_apply_1_);
            }
        };
        this.theEntity = theEntityIn;
        this.classToAvoid = classToAvoidIn;
        this.avoidTargetSelector = avoidTargetSelectorIn;
        this.avoidDistance = avoidDistanceIn;
        this.farSpeed = farSpeedIn;
        this.nearSpeed = nearSpeedIn;
        this.entityPathNavigate = theEntityIn.getNavigator();
        this.setMutexBits(1);
    }

    /**
     * Returns whether the EntityAIBase should begin execution.
     */
    public boolean shouldExecute()
    {
        List<T> list = this.theEntity.worldObj.<T>getEntitiesWithinAABB(this.classToAvoid, this.theEntity.getEntityBoundingBox().expand((double)this.avoidDistance, 3.0D, (double)this.avoidDistance), Predicates.and(new Predicate[] {this.canBeSeenSelector, this.avoidTargetSelector}));

        if (list.isEmpty())
        {
            return false;
        }
        else
        {
            this.closestLivingEntity = list.get(0);
            Vec3 vec3 = RandomPositionGenerator.findRandomTargetBlockAwayFrom(this.theEntity, 16, 7, new Vec3(this.closestLivingEntity.posX, this.closestLivingEntity.posY, this.closestLivingEntity.posZ));

            if (vec3 == null)
            {
                return false;
            }
            else if (this.closestLivingEntity.getDistanceSq(vec3.xCoord, vec3.yCoord, vec3.zCoord) < this.closestLivingEntity.getDistanceSqToEntity(this.theEntity))
            {
                return false;
            }
            else
            {
                this.entityPathEntity = this.entityPathNavigate.getPathToXYZ(vec3.xCoord, vec3.yCoord, vec3.zCoord);
                return this.entityPathEntity == null ? false : this.entityPathEntity.isDestinationSame(vec3);
            }
        }
    }

    /**
     * Returns whether an in-progress EntityAIBase should continue executing
     */
    public boolean continueExecuting()
    {
        return !this.entityPathNavigate.noPath();
    }

    /**
     * Execute a one shot task or start executing a continuous task
     */
    public void startExecuting()
    {
        this.entityPathNavigate.setPath(this.entityPathEntity, this.farSpeed);
    }

    /**
     * Resets the task
     */
    public void resetTask()
    {
        this.closestLivingEntity = null;
    }

    /**
     * Updates the task
     */
    public void updateTask()
    {
        if (this.theEntity.getDistanceSqToEntity(this.closestLivingEntity) < 49.0D)
        {
            this.theEntity.getNavigator().setSpeed(this.nearSpeed);
        }
        else
        {
            this.theEntity.getNavigator().setSpeed(this.farSpeed);
        }
    }
}
