🐛 Fixes for activities API

DysonNetwork.Sphere/Activity/ActivityController.cs

@@ -2,6 +2,7 @@ using DysonNetwork.Sphere.Account;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using NodaTime;
+using NodaTime.Text;
 
 namespace DysonNetwork.Sphere.Activity;
 
@@ -23,11 +24,21 @@ public class ActivityController(
     /// Besides, when users are logged in, it will also mix the other kinds of data and who're plying to them.
     /// </summary>
     [HttpGet]
-    public async Task<ActionResult<List<Activity>>> ListActivities([FromQuery] int? cursor, [FromQuery] int take = 20)
+    public async Task<ActionResult<List<Activity>>> ListActivities([FromQuery] string? cursor, [FromQuery] int take = 20)
     {
-        var cursorTimestamp = cursor is <= 1000
-            ? SystemClock.Instance.GetCurrentInstant()
-            : Instant.FromUnixTimeMilliseconds(cursor!.Value);
+        Instant? cursorTimestamp = null;
+        if (!string.IsNullOrEmpty(cursor))
+        {
+            try
+            {
+                cursorTimestamp = InstantPattern.ExtendedIso.Parse(cursor).GetValueOrThrow();
+            }
+            catch
+            {
+                return BadRequest("Invalid cursor format");
+            }
+        }
+
 
         HttpContext.Items.TryGetValue("CurrentUser", out var currentUserValue);
         if (currentUserValue is not Account.Account currentUser)

DysonNetwork.Sphere/Activity/ActivityService.cs

@@ -5,9 +5,9 @@ using NodaTime;
 
 namespace DysonNetwork.Sphere.Activity;
 
-public class ActivityService(AppDatabase db, RelationshipService rels)
+public class ActivityService(AppDatabase db, RelationshipService rels, PostService ps)
 {
-    public async Task<List<Activity>> GetActivitiesForAnyone(int take, Instant cursor)
+    public async Task<List<Activity>> GetActivitiesForAnyone(int take, Instant? cursor)
     {
         var activities = new List<Activity>();
         
@@ -18,19 +18,31 @@ public class ActivityService(AppDatabase db, RelationshipService rels)
             .Include(e => e.Categories)
             .Include(e => e.Tags)
             .Where(e => e.RepliedPostId == null)
-            .Where(p => p.CreatedAt > cursor)
+            .Where(p => cursor == null || cursor > p.CreatedAt)
+            .OrderByDescending(p => p.PublishedAt)
             .FilterWithVisibility(null, [], isListing: true)
             .Take(take)
             .ToListAsync();
+        posts = PostService.TruncatePostContent(posts);
+        posts = await ps.LoadPublishers(posts);
+
+        var postsId = posts.Select(e => e.Id).ToList();
+        var reactionMaps = await ps.GetPostReactionMapBatch(postsId);
+        foreach (var post in posts)
+            post.ReactionsCount =
+                reactionMaps.TryGetValue(post.Id, out var count) ? count : new Dictionary<string, int>();
         
         // Formatting data
         foreach (var post in posts)
             activities.Add(post.ToActivity());
         
+        if (activities.Count == 0)
+            activities.Add(Activity.Empty());
+
         return activities;
     }
     
-    public async Task<List<Activity>> GetActivities(int take, Instant cursor, Account.Account currentUser)
+    public async Task<List<Activity>> GetActivities(int take, Instant? cursor, Account.Account currentUser)
     {
         var activities = new List<Activity>();
         var userFriends = await rels.ListAccountFriends(currentUser);
@@ -41,21 +53,27 @@ public class ActivityService(AppDatabase db, RelationshipService rels)
             .Include(e => e.ForwardedPost)
             .Include(e => e.Categories)
             .Include(e => e.Tags)
-            .Where(e => e.RepliedPostId == null || e.RepliedPostId == currentUser.Id)
-            .Where(p => p.CreatedAt > cursor)
+            .Where(e => e.RepliedPostId == null)
+            .Where(p => cursor == null || p.CreatedAt > cursor)
+            .OrderByDescending(p => p.PublishedAt)
             .FilterWithVisibility(currentUser, userFriends, isListing: true)
             .Take(take)
             .ToListAsync();
+        posts = PostService.TruncatePostContent(posts);
+        posts = await ps.LoadPublishers(posts);
+
+        var postsId = posts.Select(e => e.Id).ToList();
+        var reactionMaps = await ps.GetPostReactionMapBatch(postsId);
+        foreach (var post in posts)
+            post.ReactionsCount =
+                reactionMaps.TryGetValue(post.Id, out var count) ? count : new Dictionary<string, int>();
         
         // Formatting data
         foreach (var post in posts)
             activities.Add(post.ToActivity());
         
         if (activities.Count == 0)
-        {
-            var now = SystemClock.Instance.GetCurrentInstant();
             activities.Add(Activity.Empty());
-        }
 
         return activities;
     }

DysonNetwork.Sphere/Post/Post.cs

@@ -79,7 +79,7 @@ public class Post : ModelBase, IIdentifiedResource, IActivity
             Id = Id,
             Type = RepliedPostId is null ? "posts.new" : "posts.new.replies",
             ResourceIdentifier = ResourceIdentifier,
-            Data = null
+            Data = this
         };
     }
 }