better-tee/Assets/Code/Player/Timer.cs

using System;
using UnityEngine;


namespace BetterTee.Player 
{

    public class Timer : MonoBehaviour
    {
        public float startingTime = 0f;
        public float time = 0f;

        private bool isTriggered = false;
        private bool isRunning = false;    

        protected void Update() {
            if(time >= 0f) {
                if(isRunning) {
                    time -= Time.deltaTime;
                }
            }
            else {
                if(isTriggered) {
                    OnTimeOut();
                    time = 0f;
                    isTriggered = false;
                    isRunning = false;
                }
            }
        }

        public void TimerSet(float startingTime) {
            isTriggered = true;
            isRunning = false;
            this.startingTime = startingTime;
            time = startingTime;        
        }

        public void TimerStart() {
            isRunning = true;
        }

        public void TimerPause() {
            isRunning = false;
        }

        public void TimerCancel() {
            time = 0f;
            isTriggered = false;
            isRunning = false;
        }

        public event Action OnTimeOut;
    }

}