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using UnityEngine;
using BehaviorDesigner.Runtime;
using BehaviorDesigner.Runtime.Tasks;
using UnityEngine.AI;

[TaskCategory ( "MyActions" )]
public class GoToTarget : Action
{
    [SerializeField] Transform target;
    [SerializeField] float captureDistance;
    [SerializeField] float speed;

    private NavMeshAgent nav;

    public override void OnStart ()
    {
        nav = GetComponent<NavMeshAgent> ();
        nav.speed = this.speed;
        nav.isStopped = false;
    }

    public override TaskStatus OnUpdate ()
    {
        nav.SetDestination ( target.position );

        var distance = CalcDistanceOnGround(target.position, this.transform.position);

        if ( distance < captureDistance )
        {
            nav.isStopped = true;
            return TaskStatus.Success;
        }

        return TaskStatus.Running;
    }

    /// <summary>
    /// XZ平面上での距離を返す
    /// </summary>
    /// <returns></returns>
    private float CalcDistanceOnGround ( Vector3 a, Vector3 b )
    {
        var aOnGround = new Vector2(a.x, a.z);
        var bOnGround = new Vector2(b.x, b.z);
        return Vector2.Distance ( aOnGround, bOnGround );
    }
}