rabidus-test/Assets/BonusController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class BonusController : MonoBehaviour, ITextChangable
{
    public UnityEvent<object> OnTextChange => _OnTextChange;
    private UnityEvent<object> _OnTextChange = new UnityEvent<object>();
    
    private float _bonusValue = 1f;
    public float BonusValue
    {
        get => _bonusValue;
        set
        {
            _bonusValue = value;
            _OnTextChange?.Invoke(_bonusValue);
        }
    }

    [SerializeField]
    private float _bonusOffset = 0.1f;
    [SerializeField]
    private float _decreaseReloadTime = 5f;
    [SerializeField]
    private float _decreaseSpeed = 0.6f;

    private bool _decreaseBonus = false;
    private Coroutine _decreaseReloadCoroutine;

    private void Start()
    {
        BonusValue = 1;
    }

    private IEnumerator DecreaseReload_Coroutine()
    {
        _decreaseBonus = false;
        yield return new WaitForSeconds(_decreaseReloadTime);
        _decreaseBonus = true;
    }

    public void DecreaseReload()
    {
        if (_decreaseReloadCoroutine != null)
        {
            StopCoroutine(_decreaseReloadCoroutine);
        }

        _decreaseReloadCoroutine = StartCoroutine(DecreaseReload_Coroutine());
    }

    public void UseBonus() 
    {
        BonusValue += _bonusOffset;
    }

    private void FixedUpdate()
    {
        if (_decreaseBonus)
        {
            BonusValue -= Time.deltaTime * _decreaseSpeed;
            BonusValue = Mathf.Clamp(BonusValue, 1, float.MaxValue);

            _OnTextChange?.Invoke(BonusValue);
            if (BonusValue == 1)
                _decreaseBonus = false;
        }
    }
}