added tag support as in quotable api

Program.cs

@@ -105,19 +105,39 @@ app.MapGet("/quotes", async (QuoteDbContext db, int pageNumber = 1, int pageSize
 // });
 
 // Random quote endpoint
-app.MapGet("/quotes/random", async (QuoteDbContext db, [FromQuery] DataSetSources dataset = DataSetSources.all) =>
+app.MapGet("/quotes/random", async (QuoteDbContext db, [FromQuery] DataSetSources dataset = DataSetSources.all, [FromQuery] string tags = "") =>
 {
     if (!Enum.IsDefined(typeof(DataSetSources), dataset))
         return Results.BadRequest("Invalid dataset.");
 
     int quoteCount = 0;
+    var quotes = GlobalData.Quotes;
+    
+    var tagsList = new List<string>();
+    if (!string.IsNullOrEmpty(tags))
+    {
+        try {
+            tagsList = tags.Split('|', StringSplitOptions.RemoveEmptyEntries).Select(x => x.ToLower()).ToList();
+        } catch (Exception) {
+            return Results.BadRequest("Invalid tags.");
+        }
+    }
+
+    if (tagsList.Count > 0)
+    {
+        quotes = quotes.Where(q => !string.IsNullOrEmpty(q.Categories) && q.Categories.Split(',').Any(x => tagsList.Select(y => y.ToLower()).Contains(x))).ToList();
+    }
+
+    Quote? randomQuote = null;
+    
+    
     if (dataset != DataSetSources.all)
     {
-        quoteCount = GlobalData.Quotes.Count(q => q.DataSet == dataset.ToString());
+        quoteCount = quotes.Count(q => q.DataSet == dataset.ToString());
     }
     else
     {
-        quoteCount = GlobalData.Quotes.Count(); //await db.Quotes.CountAsync();
+        quoteCount = quotes.Count(); //await db.Quotes.CountAsync();
     }
 
     if (quoteCount == 0)
@@ -125,11 +145,10 @@ app.MapGet("/quotes/random", async (QuoteDbContext db, [FromQuery] DataSetSource
 
     var random = new Random();
     var randomIndex = random.Next(quoteCount);
-
-    Quote? randomQuote = null;
+    
     if (dataset != DataSetSources.all)
     {
-        randomQuote = GlobalData.Quotes
+        randomQuote = quotes
             .Where(q => q.DataSet == dataset.ToString())
             .Skip(randomIndex)
             .Take(1)
@@ -137,7 +156,7 @@ app.MapGet("/quotes/random", async (QuoteDbContext db, [FromQuery] DataSetSource
     }
     else
     {
-        randomQuote = GlobalData.Quotes[randomIndex]; //await db.Quotes.Skip(randomIndex).Take(1).FirstOrDefaultAsync();
+        randomQuote = quotes[randomIndex]; //await db.Quotes.Skip(randomIndex).Take(1).FirstOrDefaultAsync();
     }
     return randomQuote != null ? Results.Ok(randomQuote) : Results.NotFound("No quote found.");
 });
@@ -281,7 +300,6 @@ using (var scope = app.Services.CreateScope())
 {
     var db = scope.ServiceProvider.GetRequiredService<QuoteDbContext>();
     //db.Database.EnsureCreated();
-
     GlobalData.Quotes = await db.Quotes.ToListAsync();
     //await SeedDatabase(db);
 }