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

namespace YKMoon.Tween
{
    public abstract class YKTween
    {
        public float duration;
        public TweenEasing easing;
        public bool ignoreTimeScale = false;

        private float elapsedTime = 0;
        public System.Action onFinish;

        public YKTween(float duration, TweenEasing easing = TweenEasing.Linear, bool ignoreTimeScale = false)
        {
            this.duration = duration;
            this.easing = easing;
            this.ignoreTimeScale = ignoreTimeScale;
            elapsedTime = 0;
        }

        public void Update(float deltaTime, float unscaledDeltaTime)
        {
            elapsedTime += ignoreTimeScale ? unscaledDeltaTime : deltaTime;
            float percentage = TweenEasingHandler.Apply(easing, elapsedTime, 0.0f, 1.0f, duration);
            TweenValue(percentage);
        }

        public abstract void TweenValue(float percent);
        public abstract bool IsValid();
        public virtual void Finish(bool withCallback)
        {
            if(withCallback) {
                onFinish?.Invoke();
            }
        }
        public virtual bool IsFinished() { return elapsedTime >= duration; }
    }
}