BABA_YAGA/Assets/Scripts/AI NPC/EnemyAI.cs

using System.Collections.Generic;
using UnityEngine;

public class EnemyAI : MonoBehaviour
{
    public Transform player;
    public float detectRange = 10f;
    public float moveSpeed = 3f;
    public float rotateSpeed = 50f;
    public bool isAttackReady;

    public Node behaviorTreeRoot;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        InitBehaviorTree();
    }

    // Update is called once per frame
    void Update()
    {
        if (behaviorTreeRoot != null)
        {
            behaviorTreeRoot.Evaluate();
        }
    }

    void InitBehaviorTree()
    {
        var chaseSequence = new Sequence(new List<Node>
        {
            new TaskNode(CheckCanSeePlayer),
            new TaskNode(ActionMoveToPlayer)
        });
        var rotationScanNode = new TaskNode(ActionRotationScan);
        behaviorTreeRoot = new Selector(new List<Node>
        {
            chaseSequence,
            rotationScanNode
        });
    }

    private NodeState ActionRotationScan()
    {
        Debug.Log("ActionRotationScan");
        transform.Rotate(Vector3.up, rotateSpeed * Time.deltaTime);
        return NodeState.Running;
    }

    private NodeState ActionMoveToPlayer()
    {
        Debug.Log($"Moving to Player");
        Vector3 dir = (player.position - transform.position).normalized;
        transform.position += dir * moveSpeed * Time.deltaTime;
        return NodeState.Running;
    }

    private NodeState CheckCanSeePlayer()
    {
        if (player == null)
        {
            return NodeState.Failure;
        }
        float distance = Vector3.Distance(transform.position,player.position);
        if (distance < detectRange)
        {
            Debug.Log($"Player detected!");
            return NodeState.Success;
        }
        return NodeState.Failure;
    }
}