Stats Page Overhaul (#4292)

Co-authored-by: Amelia <77553571+Fesaa@users.noreply.github.com>

API/Extensions/QueryExtensions/StatisticsQueryExtensions.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using API.Entities.Progress;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Extensions.QueryExtensions;
+
+public class IdCount
+{
+    public int Id { get; set; }
+    public int Count { get; set; }
+}
+
+/// <summary>
+/// Extensions primarily focusing on Profile and Server Stats pages/queries
+/// </summary>
+public static class StatisticsQueryExtensions
+{
+    public static async Task<List<IdCount>> GetTopCounts( this IQueryable<AppUserProgress> query, Expression<Func<AppUserProgress, int>> keySelector, int? take = null)
+    {
+        var result = query
+            .GroupBy(keySelector)
+            .Select(g => new IdCount {Id = g.Key, Count = g.Count()})
+            .OrderByDescending(x => x.Count);
+
+        if (take.HasValue)
+        {
+            return await result.Take(take.Value).ToListAsync();
+        }
+
+        return await result.ToListAsync();
+    }
+}