using System.Collections.Generic;
using Stary.Evo;
using Unity.RenderStreaming;
using Unity.XR.XREAL;
using UnityEngine;
using UnityEngine.UI;

namespace Script
{
    public interface IRenderStreamingSystem : ISystem
    {
        void SetUp();
        void HangUp();
    }

    public class RenderStreamingSystem : AbstractSystem, IRenderStreamingSystem
    {
        [Header("核心组件")] private RenderStreamingSettings settings;

        /// <summary>
        ///     Host连接
        /// </summary>
        private HostConnection hostConnection;

        [Header("Host本地视频")] private VideoStreamSender videoStreamSender;

        /// <summary>
        ///     麦克风流发送器
        /// </summary>
        private AudioStreamSender microphoneStreamer;


        /// <summary>
        ///     每个Participant的UI信息
        /// </summary>
        private readonly Dictionary<string, ParticipantUI> participantUIs = new();


        [Header("Participant视频容器")] private Transform participantVideoContainer;

        /// <summary>
        ///     渲染流管理
        /// </summary>
        private SignalingManager _signalingManager;


        private YUVToRenderTexture  _yuvToRenderTexture;
        protected override void OnInit()
        {
            participantVideoContainer = GameObject.Find("CanvasMain/ParticipantUI").transform;
            var renderStreaming = GameObject.Find("RenderStreaming").transform;
            _signalingManager = renderStreaming.GetComponent<SignalingManager>();
            hostConnection = renderStreaming.GetComponent<HostConnection>();
            videoStreamSender = hostConnection.GetComponent<VideoStreamSender>();
            microphoneStreamer = hostConnection.GetComponent<AudioStreamSender>();
            _yuvToRenderTexture = renderStreaming.AddOrGetComponent<YUVToRenderTexture>();
            if (settings == null)
                settings = new RenderStreamingSettings();
            if (settings != null)
            {
                videoStreamSender.width = (uint)settings.StreamSize.x;
                videoStreamSender.height = (uint)settings.StreamSize.y;
            }

            if (_signalingManager.runOnAwake)
                return;
            if (settings != null)
                _signalingManager.useDefaultSettings = settings.UseDefaultSettings;
            if (settings?.SignalingSettings != null)
                _signalingManager.SetSignalingSettings(settings.SignalingSettings);
            if (settings != null)
                videoStreamSender.SetCodec(settings.SenderVideoCodec);
            _signalingManager.Run();


            if (hostConnection != null)
            {
                hostConnection.OnParticipantConnected += HandleParticipantConnected;
                hostConnection.OnParticipantDisconnected += HandleParticipantDisconnected;
            }

            // 本地视频：Sender启动后显示
            videoStreamSender.OnStartedStream += OnStartedStream;
        }


        public override void Dispose()
        {
            if (hostConnection != null)
            {
                hostConnection.OnParticipantConnected -= HandleParticipantConnected;
                hostConnection.OnParticipantDisconnected -= HandleParticipantDisconnected;
            }

            videoStreamSender.OnStartedStream -= OnStartedStream;
        }

        private void OnStartedStream(string id)
        {
            // if (videoStreamSender.sourceWebCamTexture != null && localVideoImage != null)
            //     localVideoImage.texture = videoStreamSender.sourceWebCamTexture;
        }

        public void SetUp()
        {
            videoStreamSender.enabled = true;
            microphoneStreamer.enabled = true;
            hostConnection.RoomConnectionId = this.GetSystem<IGlobalConfigSystem>().GetConnectionId();
            hostConnection.CreateConnection(hostConnection.RoomConnectionId);
            if (_yuvToRenderTexture != null)
            {
                _yuvToRenderTexture.Play();
                videoStreamSender.sourceTexture = _yuvToRenderTexture.localRenderTexture;
            }
        }

        public void HangUp()
        {
            videoStreamSender.enabled = false;
            microphoneStreamer.enabled = false;
            hostConnection.DeleteConnection(hostConnection.RoomConnectionId);

            // 清理所有Participant UI
            foreach (var ui in participantUIs.Values)
                if (ui.root != null)
                    GameObject.Destroy(ui.root);

            participantUIs.Clear();
            if (_yuvToRenderTexture != null)
                _yuvToRenderTexture.Stop();
        }
        

        #region 开启相关

        /// <summary>
        ///     新Participant连接成功回调
        ///     此时Participant的独立Receiver已创建，可以绑定视频显示
        /// </summary>
        private void HandleParticipantConnected(ParticipantStreams ps)
        {
            // 创建Participant UI
            var ui = CreateParticipantUI(ps.participantId);
            participantUIs[ps.participantId] = ui;

            // 绑定视频：当Receiver收到纹理时更新RawImage
            ps.videoReceiver.OnUpdateReceiveTexture += texture =>
            {
                ui.videoImage.color = Color.white;
                // 防止纹理为null时导致RawImage闪黑（重协商/track切换时可能短暂为null）
                if (ui.videoImage != null && texture != null)
                    ui.videoImage.texture = texture;
            };

            // 绑定音频：AudioSource已在HostConnection中配置
            ps.audioReceiver.OnUpdateReceiveAudioSource += source =>
            {
                if (source != null && !source.isPlaying)
                {
                    source.loop = true;
                    source.Play();
                }
            };

            Debug.Log($"[MultiParticipantHost] Participant UI created: {ps.participantId}");
        }

        /// <summary>
        ///     动态创建单个Participant的视频显示UI
        ///     结构: [NameLabel] + [RawImage(视频画面)]
        /// </summary>
        private ParticipantUI CreateParticipantUI(string participantId)
        {
            var ui = new ParticipantUI();

            // 根节点
            ui.root = new GameObject($"ParticipantUI_{participantId}").AddComponent<RectTransform>().gameObject;
            ui.root.transform.SetParent(participantVideoContainer, false);
        
            ui.root.transform.GetComponent<RectTransform>().anchorMin = new Vector2(0,1);
            ui.root.transform.GetComponent<RectTransform>().anchorMax = new Vector2(0,1);
            ui.root.transform.GetComponent<RectTransform>().pivot = new Vector2(0.5f,0.5f);
            if (participantUIs.Count % 2 == 0)
            {
                ui.root.transform.rotation = Quaternion.Euler(0, -45, 0);
            }
            else
            {
                ui.root.transform.rotation = Quaternion.Euler(0, 45, 0);
            }

            // 名称标签
            var labelObj = new GameObject("NameLabel");
            labelObj.transform.SetParent(ui.root.transform, false);
            ui.nameLabel = labelObj.AddComponent<Text>();
            ui.nameLabel.text = $"Participant: {participantId}";
            ui.nameLabel.fontSize = 14;
            ui.nameLabel.color = Color.white;
            ui.nameLabel.alignment = TextAnchor.MiddleCenter;
            var labelLayout = labelObj.AddComponent<LayoutElement>();
            labelLayout.preferredHeight = 20;

            // 视频画面
            var imageObj = new GameObject("VideoImage");
            imageObj.transform.SetParent(ui.root.transform, false);
            ui.videoImage = imageObj.AddComponent<RawImage>();
            ui.videoImage.color = Color.black;
            var imageLayout = imageObj.AddComponent<LayoutElement>();
            imageLayout.preferredHeight = 200;

            // AspectRatioFitter保持视频比例
            var aspectRatio = imageObj.AddComponent<AspectRatioFitter>();
            aspectRatio.aspectMode = AspectRatioFitter.AspectMode.FitInParent;
            aspectRatio.aspectRatio = 16f / 9f;

            return ui;
        }

        /// <summary>
        ///     Participant断开连接回调
        ///     销毁其UI
        /// </summary>
        private void HandleParticipantDisconnected(string participantId)
        {
            if (participantUIs.TryGetValue(participantId, out var ui))
            {
                if (ui.root != null)
                    GameObject.Destroy(ui.root);
                participantUIs.Remove(participantId);
            }

            Debug.Log($"[MultiParticipantHost] Participant UI removed: {participantId}");
        }

        #endregion
        

    }

    public class ParticipantUI
    {
        public Text nameLabel;
        public GameObject root;
        public RawImage videoImage;
    }
}