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

public class Timey : MonoBehaviour
{
    private float _timer;
    public float AfterXSeconds = 3f;
    public float RunForXSeconds = 3f;

    public AnimationCurve UsingCurve = AnimationCurve.Linear(0, 0, 1, 1);

    [Range(0, 1)] public float CurrentTime;

    [Range(0, 1)] public float CurrentValue;

    private bool isRunning;


    private IEnumerator runningRoutiune;

    public bool StartImmediately = true;
    void Start()
    {
        if(StartImmediately) Activate();
    }

    public void Activate()
    {
        StopRunning();
        runningRoutiune = DoBegin();
        StartCoroutine(runningRoutiune);
    }

    private IEnumerator DoBegin()
    {
        yield return new WaitForSeconds(AfterXSeconds);
        Begin();
    }

    // Update is called once per frame
    private void Update()
    {
        if (!isRunning) return;
        if (_timer < 1)
        {
            _timer += Time.deltaTime / RunForXSeconds;
            CurrentTime = _timer;
            CurrentValue = EvaluateCurve(UsingCurve, 0, 1, CurrentTime);
            Tick.Invoke(CurrentValue);
        }
    }


    public void Begin()
    {
        CurrentValue = _timer = 0;
        isRunning = true;
      //  Reset.Invoke();
    }

    private void End()
    {
        isRunning = false;
      //  Finished.Invoke();
    }

    public void StopRunning()
    {
        if (runningRoutiune != null)
        {
            StopCoroutine(runningRoutiune);
          //  Stopped.Invoke(CurrentValue);
        }
    }

    private float EvaluateCurve(AnimationCurve curve, float start, float end, float value)
    {
        return start + (end - start) * curve.Evaluate(value);
    }

    private TimeyEvent Stopped;
    private UnityEvent Finished;
    public TimeyEvent Tick;
    private UnityEvent Reset;

}

[System.Serializable]
public class TimeyEvent : UnityEvent<float>
{

}