🐛 Fixes for sticker & sticker packs

DysonNetwork.Sphere/Post/PublisherService.cs

@@ -1,9 +1,11 @@
 using DysonNetwork.Sphere.Storage;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Caching.Memory;
 using NodaTime;
 
 namespace DysonNetwork.Sphere.Post;
 
-public class PublisherService(AppDatabase db, FileService fs)
+public class PublisherService(AppDatabase db, FileService fs, IMemoryCache cache)
 {
     public async Task<Publisher> CreateIndividualPublisher(
         Account.Account account,
@@ -44,4 +46,50 @@ public class PublisherService(AppDatabase db, FileService fs)
     }
 
     // TODO Able to create organizational publisher when the realm system is completed
+
+    public class PublisherStats
+    {
+        public int PostsCreated { get; set; }
+        public int StickerPacksCreated { get; set; }
+        public int StickersCreated { get; set; }
+        public int UpvoteReceived { get; set; }
+        public int DownvoteReceived { get; set; }
+    }
+
+    private const string PublisherStatsCacheKey = "PublisherStats_{0}";
+    
+    public async Task<PublisherStats?> GetPublisherStats(string name)
+    {
+        var cacheKey = string.Format(PublisherStatsCacheKey, name);
+        if (cache.TryGetValue(cacheKey, out PublisherStats? stats))
+            return stats;
+    
+        var publisher = await db.Publishers.FirstOrDefaultAsync(e => e.Name == name);
+        if (publisher is null) return null;
+        
+        var postsCount = await db.Posts.Where(e => e.Publisher.Id == publisher.Id).CountAsync();
+        var postsUpvotes = await db.PostReactions
+            .Where(r => r.Post.Publisher.Id == publisher.Id && r.Attitude == PostReactionAttitude.Positive)
+            .CountAsync();
+        var postsDownvotes = await db.PostReactions
+            .Where(r => r.Post.Publisher.Id == publisher.Id && r.Attitude == PostReactionAttitude.Negative)
+            .CountAsync();
+        
+        var stickerPacksId = await db.StickerPacks.Where(e => e.Publisher.Id == publisher.Id).Select(e => e.Id).ToListAsync();
+        var stickerPacksCount = stickerPacksId.Count;
+    
+        var stickersCount = await db.Stickers.Where(e => stickerPacksId.Contains(e.PackId)).CountAsync();
+        
+        stats = new PublisherStats
+        {
+            PostsCreated = postsCount,
+            StickerPacksCreated = stickerPacksCount,
+            StickersCreated = stickersCount,
+            UpvoteReceived = postsUpvotes,
+            DownvoteReceived = postsDownvotes
+        };
+    
+        cache.Set(cacheKey, stats, TimeSpan.FromMinutes(5));
+        return stats;
+    }
 }