using SHH.Contracts;
using System.IO;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace SHH.CameraDashboard
{
    public class VideoTileViewModel : ViewModelBase, IDisposable
    {
        // --- 绑定属性 ---

        private ImageSource _displayImage;
        public ImageSource DisplayImage
        {
            get => _displayImage;
            set => SetProperty(ref _displayImage, value);
        }

        private string _cameraName;
        public string CameraName
        {
            get => _cameraName;
            set => SetProperty(ref _cameraName, value);
        }

        private string _statusInfo;
        public string StatusInfo
        {
            get => _statusInfo;
            set => SetProperty(ref _statusInfo, value);
        }

        private bool _isConnected;
        public bool IsConnected
        {
            get => _isConnected;
            set => SetProperty(ref _isConnected, value);
        }

        // --- 构造函数 ---
        public VideoTileViewModel(string ip, int port, string name)
        {
            CameraName = name;
            StatusInfo = "连接中...";

            IsConnected = true;
        }

        private void HandleNewFrame(VideoPayload payload)
        {
            // 必须回到 UI 线程更新 ImageSource
            Application.Current.Dispatcher.Invoke(() =>
            {
                // 1. 更新图片
                byte[] data = payload.TargetImageBytes ?? payload.OriginalImageBytes;
                if (data != null && data.Length > 0)
                {
                    DisplayImage = ByteToBitmap(data);
                }

                // 2. 更新状态文字
                StatusInfo = $"{payload.CaptureTime:HH:mm:ss} | {data?.Length / 1024} KB";
            });
        }

        // 简单的 Bytes 转 BitmapImage (生产环境建议优化为 WriteableBitmap)
        private BitmapImage ByteToBitmap(byte[] bytes)
        {
            var bitmap = new BitmapImage();
            using (var stream = new MemoryStream(bytes))
            {
                bitmap.BeginInit();
                bitmap.CacheOption = BitmapCacheOption.OnLoad;
                bitmap.StreamSource = stream;
                bitmap.EndInit();
            }
            bitmap.Freeze(); // 必须冻结才能跨线程
            return bitmap;
        }

        public void Dispose()
        {
            IsConnected = false;
        }
    }
}