using System.Collections;
using UnityEngine;

namespace AibisDream.SaveSystem
{
    /// <summary>
    /// sections["timeline"]：各 PlayableDirector 的终/初态（TimelineCenter）。
    /// 按 D1.1 只存 AtStart/AtEnd/Stopped，不存时间轴中间帧。
    /// </summary>
    public class TimelineSnapshotProvider : IAsyncSnapshotProvider
    {
        public string SaveId => SnapshotProviderIds.Timeline;
        public int RestoreOrder => 60;

        public object Capture()
        {
            if (TimelineCenter.Instance == null)
            {
                Debug.LogWarning("[TimelineSnapshotProvider] TimelineCenter 未初始化，跳过捕获。");
                return null;
            }

            return TimelineCenter.Instance.CaptureSnapshot();
        }

        public IEnumerator RestoreAsync(object dto, SnapshotRestoreContext context)
        {
            if (dto is not TimelineSnapshotDto timeline)
            {
                context.Warn("[TimelineSnapshotProvider] DTO 类型不匹配，跳过还原。");
                yield break;
            }

            if (TimelineCenter.Instance == null)
            {
                context.Warn("[TimelineSnapshotProvider] TimelineCenter 未初始化，跳过还原。");
                yield break;
            }

            yield return TimelineCenter.Instance.RestoreSnapshotAsync(timeline);
        }
    }
}