using DG.Tweening;
using UnityEngine;

namespace Ichni.Story.UI
{
    /// <summary>
    /// 对话时常驻转动的齿轮/轮盘，以及伴随浮动的指针。
    /// </summary>
    public class DialogWheel : MonoBehaviour
    {
        [Header("轮盘旋转")]
        [Tooltip("要旋转的 RectTransform。如果不填，默认获取自身。")]
        public RectTransform wheelRect;

        [Tooltip("顺时针旋转一整圈（360度）所需的时间（秒）")]
        public float rotationCycleDuration = 5f;

        [Header("指针浮动")]
        [Tooltip("常驻上下浮动的指针对象 (RectTransform)")]
        public RectTransform pointerRect;

        [Tooltip("指针单向浮动的距离（像素）")]
        public float pointerFloatDistance = 5f;

        [Tooltip("指针完成单向浮动所需的时间")]
        public float pointerFloatDuration = 0.3f;

        private Tween _rotateTween;
        private Tween _pointerTween;
        private float _pointerStartY;

        private void Awake()
        {
            if (wheelRect == null) wheelRect = GetComponent<RectTransform>();

            if (pointerRect != null)
            {
                _pointerStartY = pointerRect.anchoredPosition.y;
            }
        }

        private void Start()
        {
            // 轮盘常驻匀速旋转
            if (wheelRect != null && rotationCycleDuration > 0f)
            {
                // SetRelative(true) 保证无论当前角度是多少，都在其基础上转 -360 度
                // LoopType.Restart 配合 Linear 缓动，实现无限丝滑旋转
                _rotateTween = wheelRect.DORotate(new Vector3(0, 0, -360f), rotationCycleDuration, RotateMode.FastBeyond360)
                    .SetRelative(true)
                    .SetLoops(-1, LoopType.Restart)
                    .SetEase(Ease.Linear);
                _rotateTween.Play();
            }

            // 指针常驻浮动，启动后永不停止
            if (pointerRect != null)
            {
                _pointerTween = pointerRect.DOAnchorPosY(_pointerStartY + pointerFloatDistance, pointerFloatDuration)
                    .SetLoops(-1, LoopType.Yoyo)
                    .SetEase(Ease.InOutSine);
                _pointerTween.Play();
            }
        }

        private void OnDestroy()
        {
            _rotateTween?.Kill();
            _pointerTween?.Kill();
        }
    }
}