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VideoBrowser/ViewModels/DownloadQueueViewModel.cs

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+namespace VideoBrowser.ViewModels
+{
+    using System;
+    using System.Collections.ObjectModel;
+    using System.ComponentModel;
+    using System.IO;
+    using System.Windows.Data;
+    using System.Windows.Input;
+    using System.Windows.Media;
+    using System.Windows.Threading;
+    using VideoBrowser.Common;
+    using VideoBrowser.Controls.CefSharpBrowser.Models;
+    using VideoBrowser.Core;
+    using VideoBrowser.Helpers;
+    using VideoBrowser.Models;
+    using VideoBrowser.Resources;
+
+    /// <summary>
+    /// Defines the <see cref="DownloadQueueViewModel" />.
+    /// </summary>
+    public class DownloadQueueViewModel
+    {
+        #region Constructors
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DownloadQueueViewModel"/> class.
+        /// </summary>
+        /// <param name="downloadItemModels">The downloadItemModels<see cref="ObservableCollection{DownloadItemModel}"/>.</param>
+        internal DownloadQueueViewModel(ObservableCollection<DownloadItemModel> downloadItemModels)
+        {
+            this.DownloadItemModels = downloadItemModels;
+            this.OperationCollectionView = CollectionViewSource.GetDefaultView(this.DownloadItemModels);
+            this.RemoveOperationCommand = new RelayCommand(this.OnRemoveOperation);
+        }
+
+        #endregion Constructors
+
+        #region Properties
+
+        /// <summary>
+        /// Gets the DownloadItemModels.
+        /// </summary>
+        public ObservableCollection<DownloadItemModel> DownloadItemModels { get; }
+
+        /// <summary>
+        /// Gets or sets the Icon.
+        /// </summary>
+        public Geometry Icon { get; set; } = Icons.Download;
+
+        /// <summary>
+        /// Gets the OperationCollectionView.
+        /// </summary>
+        public ICollectionView OperationCollectionView { get; }
+
+        /// <summary>
+        /// Gets the RemoveOperationCommand.
+        /// </summary>
+        public ICommand RemoveOperationCommand { get; }
+
+        /// <summary>
+        /// Gets or sets the ShowMessageAsync.
+        /// </summary>
+        public Action<string, string> ShowMessageAsync { get; set; }
+
+        #endregion Properties
+
+        #region Methods
+
+        /// <summary>
+        /// The Download.
+        /// </summary>
+        /// <param name="operation">The operation<see cref="Operation"/>.</param>
+        public void Download(Operation operation)
+        {
+            var operationModel = new OperationModel(operation) { PauseDownloadAction = this.OnPauseDownloadCalled, CancelDownloadAction = this.OnCancelDownloadCalled };
+            var element = (DispatcherObject)this.OperationCollectionView;
+            element.InvokeAsync(() =>
+            {
+                if (!this.DownloadItemModels.Contains(operationModel))
+                {
+                    this.DownloadItemModels.Insert(0, operationModel);
+                    DownloadQueueHandler.Add(operation);
+                }
+                else
+                {
+                    var output = Path.GetFileName(operationModel.Operation.Output);
+                    this.ShowMessageAsync("Download Canceled", $"The video/audio {output} is already downloaded");
+                }
+            });
+        }
+
+        /// <summary>
+        /// The OnCancelDownloadCalled.
+        /// </summary>
+        /// <param name="model">The model<see cref="DownloadItemModel"/>.</param>
+        internal void OnCancelDownloadCalled(DownloadItemModel model)
+        {
+            model.Dispose();
+            this.DownloadItemModels.Remove(model);
+        }
+
+        /// <summary>
+        /// The OnPauseDownloadCalled.
+        /// </summary>
+        /// <param name="model">The model<see cref="DownloadItemModel"/>.</param>
+        internal void OnPauseDownloadCalled(DownloadItemModel model)
+        {
+            if (!(model is OperationModel operationModel))
+            {
+                return;
+            }
+
+            var operation = operationModel.Operation;
+            var status = operation.Status;
+            if (status != OperationStatus.Paused && status != OperationStatus.Queued && status != OperationStatus.Working)
+            {
+                return;
+            }
+
+            if (status == OperationStatus.Paused)
+            {
+                operation.Resume();
+                model.PauseText = "Pause";
+            }
+            else
+            {
+                operation.Pause();
+                model.PauseText = "Resume";
+            }
+        }
+
+        /// <summary>
+        /// The OnRemoveVideo.
+        /// </summary>
+        /// <param name="obj">The obj<see cref="object"/>.</param>
+        private void OnRemoveOperation(object obj)
+        {
+        }
+
+        #endregion Methods
+    }
+}