⚗️ Adjust the algorithm for both the featured post and the activity feed

DysonNetwork.Sphere/Activity/ActivityService.cs

@@ -23,7 +23,7 @@ public class ActivityService(
         var postTime = post.PublishedAt ?? post.CreatedAt;
         var hours = (now - postTime).TotalHours;
         // Add 1 to score to prevent negative results for posts with more downvotes than upvotes
-        return (score + 1) / Math.Pow(hours + 2, 1.8);
+        return (score + 1) / Math.Pow(hours + 1.5, 2.0);
     }
 
     public async Task<List<Activity>> GetActivitiesForAnyone(
@@ -61,8 +61,10 @@ public class ActivityService(
                 if (discovery != null)
                     interleaved.Add(discovery);
             }
+
             interleaved.Add(post.ToActivity());
         }
+
         activities.AddRange(interleaved);
 
         if (activities.Count == 0)
@@ -127,8 +129,10 @@ public class ActivityService(
                 if (discovery != null)
                     interleaved.Add(discovery);
             }
+
             interleaved.Add(post.ToActivity());
         }
+
         activities.AddRange(interleaved);
 
         if (activities.Count == 0)
@@ -210,19 +214,19 @@ public class ActivityService(
 
     private async Task<Activity?> GetShuffledPostsActivity(int count = 5)
     {
-        var posts = await db.Posts
+        var postsQuery = db.Posts
             .Include(p => p.Categories)
             .Include(p => p.Tags)
             .Include(p => p.Realm)
             .Where(p => p.RepliedPostId == null)
             .OrderBy(_ => EF.Functions.Random())
-            .Take(count)
+            .Take(count);
-            .ToListAsync();
 
-        if (posts.Count == 0)
+        var posts = await GetAndProcessPosts(postsQuery, trackViews: false);
-            return null;
 
-        return new DiscoveryActivity(posts.Select(x => new DiscoveryItem("post", x)).ToList()).ToActivity();
+        return posts.Count == 0
+            ? null
+            : new DiscoveryActivity(posts.Select(x => new DiscoveryItem("post", x)).ToList()).ToActivity();
     }
 
     private async Task<Activity?> GetArticleDiscoveryActivity(int count = 5, int feedSampleSize = 10)

DysonNetwork.Sphere/Post/Post.cs

@@ -11,8 +11,7 @@ namespace DysonNetwork.Sphere.Post;
 public enum PostType
 {
     Moment,
-    Article,
+    Article
-    Video
 }
 
 public enum PostVisibility

DysonNetwork.Sphere/Post/PostService.cs

@@ -818,19 +818,40 @@ public partial class PostService(
             var periodStart = today.InUtc().Date.AtStartOfDayInZone(DateTimeZone.Utc).ToInstant().Minus(Duration.FromDays(1));
             var periodEnd = today.InUtc().Date.AtStartOfDayInZone(DateTimeZone.Utc).ToInstant();
             
-            var reactSocialPoints = await db.PostReactions
+            var postsInPeriod = await db.Posts
-                .Include(e => e.Post)
+                .Where(e => e.Visibility == PostVisibility.Public)
-                .Where(e => e.Post.Visibility == PostVisibility.Public)
+                .Where(e => e.CreatedAt >= periodStart && e.CreatedAt < periodEnd)
-                .Where(e => e.Post.CreatedAt >= periodStart && e.Post.CreatedAt < periodEnd)
+                .Select(e => e.Id)
+                .ToListAsync();
+
+            var reactionScores = await db.PostReactions
+                .Where(e => postsInPeriod.Contains(e.PostId))
                 .GroupBy(e => e.PostId)
                 .Select(e => new
                 {
                     PostId = e.Key,
-                    Count = e.Sum(r => r.Attitude == PostReactionAttitude.Positive ? 1 : -1)
+                    Score = e.Sum(r => r.Attitude == PostReactionAttitude.Positive ? 1 : -1)
+                })
+                .ToDictionaryAsync(e => e.PostId, e => e.Score);
+
+            var repliesCounts = await db.Posts
+                .Where(p => p.RepliedPostId != null && postsInPeriod.Contains(p.RepliedPostId.Value))
+                .GroupBy(p => p.RepliedPostId!.Value)
+                .ToDictionaryAsync(
+                    g => g.Key,
+                    g => g.Count()
+                );
+
+            var reactSocialPoints = postsInPeriod
+                .Select(postId => new
+                {
+                    PostId = postId,
+                    Count = (reactionScores.TryGetValue(postId, out var rScore) ? rScore : 0) +
+                            (repliesCounts.TryGetValue(postId, out var repCount) ? repCount : 0)
                 })
                 .OrderByDescending(e => e.Count)
                 .Take(5)
-                .ToDictionaryAsync(e => e.PostId, e => e.Count);
+                .ToDictionary(e => e.PostId, e => e.Count);
 
             featuredIds = reactSocialPoints.Select(e => e.Key).ToList();