add cover art watermark source (#491)

* add cover art watermark source

* update changelog

ErsatzTV/Pages/WatermarkEditor.razor

@@ -31,11 +31,12 @@
                                Disabled="@(_model.Mode == ChannelWatermarkMode.None)">
                         <MudSelectItem Value="@(ChannelWatermarkImageSource.Custom)">Custom</MudSelectItem>
                         <MudSelectItem Value="@(ChannelWatermarkImageSource.ChannelLogo)">Channel Logo</MudSelectItem>
+                        <MudSelectItem Value="@(ChannelWatermarkImageSource.CoverArt)">Cover Art</MudSelectItem>
                     </MudSelect>
                     <MudGrid Class="mt-3" Style="align-items: center" Justify="Justify.Center">
                         <MudItem xs="6">
                             <InputFile id="watermarkFileInput" OnChange="UploadWatermark" style="display: none;"/>
-                            @if (!string.IsNullOrWhiteSpace(_model.Image) && _model.ImageSource != ChannelWatermarkImageSource.ChannelLogo)
+                            @if (!string.IsNullOrWhiteSpace(_model.Image) && _model.ImageSource == ChannelWatermarkImageSource.Custom)
                             {
                                 <MudElement HtmlTag="img" src="@($"artwork/watermarks/{_model.Image}")" Style="max-height: 50px"/>
                             }
@@ -46,7 +47,7 @@
                                        Variant="Variant.Filled"
                                        Color="Color.Primary"
                                        StartIcon="@Icons.Material.Filled.CloudUpload"
-                                       Disabled="@(_model.ImageSource == ChannelWatermarkImageSource.ChannelLogo)"
+                                       Disabled="@(_model.ImageSource != ChannelWatermarkImageSource.Custom)"
                                        for="watermarkFileInput">
                                 Upload Image
                             </MudButton>

ErsatzTV/Pages/Watermarks.razor

@@ -38,6 +38,10 @@
                 {
                     <MudText>[channel logo]</MudText>
                 }
+                else if (context.ImageSource == ChannelWatermarkImageSource.CoverArt)
+                {
+                    <MudText>[cover art]</MudText>
+                }
             </MudTd>
             <MudTd DataLabel="Mode">
                 @context.Mode

ErsatzTV/Validators/WatermarkEditViewModelValidator.cs

@@ -9,10 +9,11 @@ namespace ErsatzTV.Validators
         public WatermarkEditViewModelValidator()
         {
             RuleFor(x => x.Name).NotEmpty();
-            
+
             RuleFor(x => x.Image)
                 .NotEmpty()
-                .WithMessage("Watermark image is required!");
+                .WithMessage("Watermark image is required!")
+                .When(vm => vm.ImageSource == ChannelWatermarkImageSource.Custom);
             
             RuleFor(x => x.Width)
                 .GreaterThan(0)