BloodAndGore/Assets/Scripts/Enemies/Enemy.cs

using UnityEngine;
using Saltosion.OneWeapon.AI;

namespace Saltosion.OneWeapon {
    [RequireComponent(typeof(Rigidbody2D))]
    public class Enemy : MonoBehaviour {
        [Header("Debug Info")]
        public string CurrentBehavior = "Nothing";
        [Header("Graphics")]
        public SpriteRenderer Renderer;
        public Sprite IdleSprite;
        public Sprite AttackingSprite;
        public int MovementAnimationFramerate;
        public Sprite[] MovementSprites;
        [Header("Stats")]
        public float MoveSpeed;
        [Header("Behaviour")]
        public BehaviourNode BehaviourTree;

        [HideInInspector]
        public bool Attacking;

        private Rigidbody2D Body;
        private bool MovingToTarget = false;
        private Vector2 TargetPosition;

        private void Start() {
            Body = GetComponent<Rigidbody2D>();
        }

        private void Update() {
            BehaviourTree.Execute(this);
            CurrentBehavior = BehaviourTree.GetExecutedName();

            if (Attacking) {
                Renderer.sprite = AttackingSprite;
            } else if (Body.velocity.magnitude > 0.1) {
                Renderer.sprite = MovementSprites[(int)(Time.time * MovementAnimationFramerate) % MovementSprites.Length];
            } else {
                Renderer.sprite = IdleSprite;
            }
        }

        private void FixedUpdate() {
            if (MovingToTarget) {
                Body.velocity = (TargetPosition - Body.position).normalized * MoveSpeed;
            }
        }

        public void StartMovingTo(Vector2 target) {
            TargetPosition = target;
            MovingToTarget = true;
        }

        public void StopMoving() {
            MovingToTarget = false;
        }
    }
}