tiny_tackle_heroes/Assets/_Project/Scripts/Progression/ExperienceOrb.cs

using BumpCombat.Constants;
using UnityEngine;

namespace BumpCombat.Progression
{
    [RequireComponent(typeof(Rigidbody2D), typeof(CircleCollider2D))]
    public sealed class ExperienceOrb : MonoBehaviour
    {
        private Rigidbody2D body;
        private ExperienceSystem experienceSystem;
        private Transform player;
        private int value;
        private bool pickedUp;

        private void Awake()
        {
            body = GetComponent<Rigidbody2D>();
        }

        private void Start()
        {
            experienceSystem = FindAnyObjectByType<ExperienceSystem>();
            player = experienceSystem != null ? experienceSystem.transform : null;
        }

        private void FixedUpdate()
        {
            if (player == null || pickedUp)
            {
                return;
            }

            float distance = Vector2.Distance(body.position, player.position);
            ItemConstants tuning = GameplayConstants.Current.Items;
            if (distance <= tuning.ExperienceOrbPickupRadius)
            {
                pickedUp = true;
                experienceSystem.CollectExperienceOrb(value);
                Destroy(gameObject);
                return;
            }

            if (distance <= tuning.ExperienceOrbMagnetRadius)
            {
                body.MovePosition(Vector2.MoveTowards(
                    body.position,
                    player.position,
                    tuning.ExperienceOrbMagnetSpeed * Time.fixedDeltaTime));
            }
        }

        public void Initialize(int experienceValue)
        {
            value = Mathf.Max(0, experienceValue);
        }
    }
}