using FFmpeg.AutoGen;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Vinno.FIS.TRTCClient.Common.Enum;
using Vinno.vCloud.FIS.CrossPlatform.Common;
using Vinno.vCloud.FIS.CrossPlatform.Common.Enum;
using Vinno.vCloud.FIS.CrossPlatform.Common.LiveVideo;
using Vinno.vCloud.FIS.CrossPlatform.Common.LiveVideo.Interface;

namespace Vinno.vCloud.FIS.CrossPlatform.Windows.LiveVideo
{
    public abstract unsafe class MergePusherBase : PusherBase, ILiveVideoPusherForSonopost
    {
        private readonly Dictionary<EnumLiveChannelCategory, ICapturer> _captures;
        private readonly IMergeUtil _mergeUtil;
        private readonly FormatConvertUtil _convertUtil;
        private readonly ManualResetEvent _handlingImageEvent = new ManualResetEvent(true);

        private CancellationTokenSource _tokenSource;
        private AVFrame* _srcFrame;
        private AVFrame* _destFrame;
        protected const int MergeWidth = 1920;
        protected const int MergeHeight = 1080;
        protected const int MergeFrameRate = 20;

        public event EventHandler<ChannelStateEventArgs> ChannelStateChanged;

        public MergePusherBase()
        {
            _captures = new Dictionary<EnumLiveChannelCategory, ICapturer>();
            _mergeUtil = new RGBMergeUtil(MergeWidth, MergeHeight);
            _convertUtil = new FormatConvertUtil();
        }

        public virtual bool StartPusher(IExtendedData pushParams, IEnumerable<CPVideoDeviceInfo> deviceInfos)
        {
            InitPushersAndMergeOffsets(pushParams, deviceInfos);
            StartCaptures();
            StartPostMergeImageDataThread();
            return true;
        }

        public abstract void SetMute(bool isMute);

        public virtual bool StopPusher()
        {
            StopPostMergeImageDataThread();
            StopCaptures();
            return true;
        }

        protected void InitCacheImage(AVPixelFormat destFormat)
        {
            _srcFrame = AvFrameOperateUtil.Create(MergeWidth, MergeHeight, AVPixelFormat.AV_PIX_FMT_BGRA);
            _destFrame = AvFrameOperateUtil.Create(MergeWidth, MergeHeight, destFormat);
        }

        protected virtual void DealWithFullBuffer(AVFrame* frame)
        {
        }

        protected void PushLiveStateChanged()
        {
            ChannelStateChanged?.Invoke(this, new ChannelStateEventArgs(EnumLiveChannelCategory.Main, EnumLiveStates.TerminalIsPushing));
        }

        private void InitPushersAndMergeOffsets(IExtendedData pushParams, IEnumerable<CPVideoDeviceInfo> deviceInfos)
        {
            var areaImageInfos = new List<AreaImageInfo>();
            if (pushParams is RtcExtendedData rtcExtendedData)
            {
                foreach (var user in rtcExtendedData.UserInfos)
                {
                    var deviceInfo = deviceInfos.FirstOrDefault(c => c.Category == user.Category);
                    if (deviceInfo != null)
                    {
                        var capturer = new Capturer(deviceInfo.Id, user.Width, user.Height, user.Category == EnumLiveChannelCategory.Main ? 20 : 15, user.Category, deviceInfo.Width, deviceInfo.Height, false);
                        areaImageInfos.Add(new AreaImageInfo { Width = user.Width, Height = user.Height, Category = user.Category });
                        _captures.Add(user.Category, capturer);
                    }
                    else
                    {
                        CrossPlatformHelper.Instance.LogWriter?.WriteLineError($"Can not find {user.Category} Device Info!");
                    }
                }
            }
            else if (pushParams is RtmpExtendedData rtmpExtendedData)
            {
                foreach (var user in rtmpExtendedData.UserInfos)
                {
                    var deviceInfo = deviceInfos.FirstOrDefault(c => c.Category == user.Category);
                    if (deviceInfo != null)
                    {
                        var capturer = new Capturer(deviceInfo.Id, user.Width, user.Height, user.Category == EnumLiveChannelCategory.Main ? 20 : 15, user.Category, deviceInfo.Width, deviceInfo.Height, false);
                        areaImageInfos.Add(new AreaImageInfo { Width = user.Width, Height = user.Height, Category = user.Category });
                        _captures.Add(user.Category, capturer);
                    }
                    else
                    {
                        CrossPlatformHelper.Instance.LogWriter?.WriteLineError($"Can not find {user.Category} Device Info!");
                    }
                }
            }
            _mergeUtil.InitAreaOffset(areaImageInfos);
        }

        private void StartCaptures()
        {
            foreach (var capturer in _captures.Values)
            {
                capturer.ImageFrameReceived += OnImageReceived;
                capturer.StartCapture();
            }
        }

        private void StopCaptures()
        {
            foreach (var capture in _captures.Values)
            {
                capture.ImageFrameReceived -= OnImageReceived;
                capture.StopCapture();
                capture.Dispose();
            }
            _captures.Clear();
        }

        private unsafe void StartPostMergeImageDataThread()
        {
            if (_tokenSource != null && !_tokenSource.IsCancellationRequested)
            {
                _tokenSource.Cancel();
            }
            _tokenSource = new CancellationTokenSource();

            Task.Run(() =>
            {
                while (!_tokenSource.IsCancellationRequested)
                {
                    try
                    {
                        _handlingImageEvent.Reset();
                        _mergeUtil.GetFullBuffer(new IntPtr(_srcFrame->data[0]));
                        _convertUtil.Convert(_srcFrame, _destFrame);
                        DealWithFullBuffer(_destFrame);
                    }
                    catch (Exception e)
                    {
                        CrossPlatformHelper.Instance.LogWriter?.WriteLineError($"Get Full Buffer Error:{e}");
                    }
                    finally
                    {
                        _handlingImageEvent.Set();
                        Thread.Sleep(35);
                    }
                }
                _convertUtil.Dispose();
            }, _tokenSource.Token);
        }

        private void StopPostMergeImageDataThread()
        {
            _tokenSource?.Cancel();
        }

        private void OnImageReceived(object sender, ImageFrameData e)
        {
            try
            {
                if (sender is ICapturer capture)
                {
                    var area = GetAreaAndCategory(capture.Id, out var category);
                    _mergeUtil.CopyToArea(area, e);
                    CopyPreviewData(category, e);
                }
            }
            catch (Exception ex)
            {
                CrossPlatformHelper.Instance.LogWriter?.WriteLineError($"OnImageReceived Error:{ex}");
            }
        }

        private EnumArea GetAreaAndCategory(string id, out EnumLiveChannelCategory category)
        {
            foreach (var item in _captures)
            {
                if (item.Value.Id == id)
                {
                    category = item.Key;
                    return GetArea(category);
                }
            }
            throw new Exception("Can not get correct area");
        }

        protected abstract EnumArea GetArea(EnumLiveChannelCategory category);

        public override void DoDispose()
        {
            _handlingImageEvent.WaitOne();
            AvFrameOperateUtil.Destory(_srcFrame);
            AvFrameOperateUtil.Destory(_destFrame);
            _mergeUtil?.Dispose();
            base.DoDispose();
        }
    }
}