using System;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;
#if UNITY_EDITOR
using System.Reflection;
using UnityEditor;
#endif

namespace FT.Timeline
{
    [Serializable]
    public class LeviathanVideoTrackMixerBehaviour : PlayableBehaviour
    {
    }

    [Serializable]
    [TrackColor(0.82f, 0.42f, 0.62f)]
    [TrackClipType(typeof(LeviathanVideoPlayableAsset))]
    [TrackBindingType(typeof(LeviathanVideoDecoderBase))]
    [ExcludeFromPreset]
    public class LeviathanVideoTrack : TrackAsset
    {
        public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
        {
            return ScriptPlayable<LeviathanVideoTrackMixerBehaviour>.Create(graph, inputCount);
        }

        protected override void OnCreateClip(TimelineClip clip)
        {
            clip.displayName = "Leviathan Video";
            if (clip.asset is LeviathanVideoPlayableAsset asset)
            {
#if UNITY_EDITOR
                ApplyNewClipFromBoundDecoder(clip, asset);
#endif
                clip.duration = asset.clipDurationSeconds;
            }

            base.OnCreateClip(clip);
        }

#if UNITY_EDITOR
        /// <summary>
        /// 新建 Clip 时：从当前 Timeline 窗口正在编辑的 Director 上读取本轨绑定解码器，同步 Video Override 与片段时长。
        /// </summary>
        private void ApplyNewClipFromBoundDecoder(TimelineClip clip, LeviathanVideoPlayableAsset asset)
        {
            var director = TryGetTimelineInspectedDirector();
            if (director == null)
                return;

            var decoder = director.GetGenericBinding(this) as LeviathanVideoDecoderBase;
            if (decoder == null)
                return;

            if (decoder.bytesFile != null)
                asset.videoOverride = decoder.bytesFile;

            if (LeviathanVideoPlayableAsset.TryGetClipDurationSecondsFromDecoder(decoder, out var seconds) &&
                seconds > 0.0001)
                asset.clipDurationSeconds = seconds;

            EditorUtility.SetDirty(asset);
            if (timelineAsset != null)
                EditorUtility.SetDirty(timelineAsset);
        }

        private static PlayableDirector TryGetTimelineInspectedDirector()
        {
            foreach (var asm in System.AppDomain.CurrentDomain.GetAssemblies())
            {
                var t = asm.GetType("UnityEditor.Timeline.TimelineEditor");
                if (t == null)
                    continue;
                var p = t.GetProperty("inspectedDirector", BindingFlags.Public | BindingFlags.Static);
                return p?.GetValue(null) as PlayableDirector;
            }

            return null;
        }
#endif

#if UNITY_EDITOR
        public override void GatherProperties(PlayableDirector director, IPropertyCollector driver)
        {
            var bound = director.GetGenericBinding(this) as LeviathanVideoDecoderBase;
            if (bound != null)
            {
                driver.AddFromComponent(bound.gameObject, bound);
            }

            base.GatherProperties(director, driver);
        }
#endif
    }
}