Initial commit of auto-adding torrent system

AnimeAnnouncer.Web/Pages/Index.cshtml

@@ -35,7 +35,7 @@
         <div class="airing-list">
             @foreach (var show in Model.AiringShows)
             {
-                <article class="airing-row @(show.IsFuture ? "is-upcoming" : "is-aired")">
+                <article id="show-@show.ShowID" class="airing-row @(show.IsFuture ? "is-upcoming" : "is-aired")">
                     @if (!string.IsNullOrWhiteSpace(show.HeroImageUrl))
                     {
                         <div class="airing-backdrop" style="background-image: url('@show.HeroImageUrl');" aria-hidden="true"></div>
@@ -169,6 +169,17 @@
                                 {
                                     <a href="@show.AnilistUrl" target="_blank" rel="noopener noreferrer" class="btn btn-sm btn-outline-info">AniList</a>
                                 }
+                                @if (show.Download)
+                                {
+                                    <span class="btn btn-sm btn-success disabled" aria-disabled="true">✓ Marked for download</span>
+                                }
+                                else
+                                {
+                                    <form method="post" asp-page-handler="Download" class="d-inline">
+                                        <input type="hidden" name="showId" value="@show.ShowID" />
+                                        <button type="submit" class="btn btn-sm btn-outline-success">⬇ Download</button>
+                                    </form>
+                                }
 
                                 @if (show.SecondaryImages.Count > 0)
                                 {

AnimeAnnouncer.Web/Pages/Index.cshtml.cs

@@ -1,6 +1,7 @@
 using System.Net;
 using System.Text.RegularExpressions;
 using AnimeAnnouncer.Cache;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
 namespace AnimeAnnouncer.Web.Pages;
@@ -95,6 +96,25 @@ public class IndexModel : PageModel
         }
     }
 
+    public async Task<IActionResult> OnPostDownloadAsync(int showId)
+    {
+        if (_tmdbCache == null)
+            return StatusCode(StatusCodes.Status503ServiceUnavailable);
+
+        try
+        {
+            if (!await _tmdbCache.SetDownload(showId, true))
+                _logger.LogWarning("Download requested for show {ShowID}, which is not in the airing list", showId);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Failed to flag show {ShowID} for download", showId);
+        }
+
+        // Post/redirect/get, landing back on the row that was clicked.
+        return RedirectToPage(null, null, null, $"show-{showId}");
+    }
+
     public class ShowImage
     {
         public required string Url { get; set; }
@@ -112,6 +132,7 @@ public class IndexModel : PageModel
 
         public string Title => AiringSoon.Title;
         public int ShowID => AiringSoon.ShowID;
+        public bool Download => AiringSoon.Download;
         public DateTime? EffectiveLastAirDate => AiringSoon.LastAirDate ?? CachedDetails?.LastAirDate;
         public int LatestEpisodeNumber => AiringSoon.LatestEpisodeNumber > 0 
             ? AiringSoon.LatestEpisodeNumber