Youtube loader tries to get thumbnail in different resolutions

Author: usercode

src/ImageWizard.Core/Loaders/Http/HttpLoaderBase.cs

@@ -50,9 +50,6 @@ public HttpLoaderBase(
     /// <summary>
     /// GetAsync
     /// </summary>
-    /// <param name="source"></param>
-    /// <param name="existingCachedData"></param>
-    /// <returns></returns>
     public override async Task<LoaderResult> GetAsync(string source, ICachedData? existingCachedData)
     {
         Uri? url = await CreateRequestUrl(source);

src/ImageWizard.Core/Loaders/Youtube/YoutubeLoader.cs

@@ -23,6 +23,28 @@ public YouTubeLoader(
 
     protected override Task<Uri?> CreateRequestUrl(string source)
     {
-        return Task.FromResult<Uri?>(new Uri($"https://i.ytimg.com/vi/{source}/maxresdefault.jpg"));
+        return Task.FromResult<Uri?>(new Uri(source));
+    }
+
+    public override async Task<LoaderResult> GetAsync(string source, ICachedData? existingCachedData)
+    {
+        string[] quality = [
+                            "maxresdefault.jpg", //1920 x 1080   
+                            "hq720.jpg", //1280  x 720 
+                            "sddefault.jpg", //640 x 480 
+                            "hqdefault.jpg", //480 x 360                            
+                        ];
+
+        for (int i = 0; i < quality.Length; i++)
+        {
+            LoaderResult result = await base.GetAsync($"https://i.ytimg.com/vi/{source}/{quality[i]}", existingCachedData);
+
+            if (result.State == LoaderResultState.Success)
+            {
+                return result;
+            }
+        }
+
+        return LoaderResult.NotFound();
     }
 }