using UnityEngine;
using UnityEngine.UI;

namespace AlicizaX.AnimationFlow.Runtime {
    [Category("Animation")]
    public class GraphicAlphaTo : ActionNode {
        public float duration = 1f;
        public EaseType easyType;
        public Graphic target;
        public bool setFrom;
        public float from;
        public float to;

        protected float orgValue;
        protected float enterValue;

        public override void OnInit() {
            orgValue = target.color.a;
        }

        public override void OnReset() {
            target.color = new Color(target.color.r, target.color.g, target.color.b, orgValue);
        }

        public override void OnEnter() {
            if (setFrom) {
                target.color = new Color(target.color.r, target.color.g, target.color.b, from);
            }
            enterValue = target.color.a;
        }

        public override void OnUpdate(float dt) {
            float a = Easing.Ease(easyType, enterValue, to, elapsedTime / duration);
            target.color = new Color(target.color.r, target.color.g, target.color.b, a);
        }

        public override bool Valid() {
            return target != null && duration > 0;
        }

        public override float Duration() {
            return duration;
        }

        public override bool HasSubTitle() {
            return true;
        }

        public override string SubTitle() {
            return target != null ? target.name : null;
        }
    }
}