using UnityEngine;

namespace AlicizaX.AnimationFlow.Runtime {
    [Category("Utility")]
    public class SequenceFrameAnimation : ActionNode {
        public SpriteRenderer target;
        public float interval;
        public Sprite[] sprites;
        public bool rewind;

        private int curIndex;
        private bool is_rewind;
        private float curTime;

        private void ResetData() {
            curIndex = 0;
            is_rewind = false;
            curTime = 0;
        }

        public override void OnReset() {
            ResetData();
        }

        public override void OnEnter() {
            ResetData();
        }

        public override void OnUpdate(float dt) {
            if (curTime <= 0) {
                curTime += interval;
                if (curIndex >= sprites.Length) {
                    return;
                }
                target.sprite = sprites[curIndex];
                if (is_rewind) {
                    curIndex = Mathf.Max(0, curIndex - 1);
                } else {
                    curIndex++;
                    if (curIndex >= sprites.Length) {
                        if (rewind) {
                            is_rewind = true;
                            curIndex--;
                        } else {
                            curIndex = 0;
                        }
                    }
                }
            } else {
                curTime -= dt;
            }
        }

        public override float Duration() {
            return interval * (sprites.Length + 1) * (rewind ? 2 : 1);
        }

        public override bool Valid() {
            return interval > 0 && sprites.Length > 0;
        }
        public override bool HasSubTitle() {
            return true;
        }
        public override string SubTitle() {
            return target != null ? target.name : null;
        }
    }
}