Chat/ChatController/Utilities/ChatMessageFileWrapper.cs

using System;
using System.ComponentModel;
using System.IO;
using System.Runtime.CompilerServices;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using ChatController.Annotations;

namespace ChatController.Utilities
{
    public class ChatMessageFileWrapper : INotifyPropertyChanged
    {
        public string FileName => !string.IsNullOrWhiteSpace(OriginalFilePath) ? Path.GetFileName(OriginalFilePath) : null;

        private string _OriginalFilePath;
        public string OriginalFilePath
        {
            get => _OriginalFilePath;
            set
            {
                _OriginalFilePath = value;
                OnPropertyChanged();
                OnPropertyChanged(nameof(FileName));
            }
        }

        private string _ScaledFilePath;
        public string ScaledFilePath
        {
            get => _ScaledFilePath;
            set
            {
                _ScaledFilePath = value;
                OnPropertyChanged();
            }
        }

        private ImageSource _ChatMessageImageSource;

        public ImageSource ChatMessageImageSource
        {
            get => _ChatMessageImageSource;
            private set
            {
                _ChatMessageImageSource = value;
                OnPropertyChanged();
            }
        }

        public ChatMessageFileWrapper(string originalFilePath, string scaledFilePath, string thumbnailUrl)
        {
            OriginalFilePath = originalFilePath;
            ScaledFilePath = scaledFilePath;

            var uri = new Uri(scaledFilePath);

            if(Constants.ImageFileExtensions.Contains(Path.GetExtension(scaledFilePath).ToUpperInvariant()) && uri.IsFile)
            {
                var bitmap = new BitmapImage(uri);
                bitmap.Freeze();

                ChatMessageImageSource = bitmap;
            }
            else
            {
                Utils.DownloadDocumentThumbnail(thumbnailUrl, imageSource =>
                {
                    ChatMessageImageSource = imageSource;
                });
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}