[reputation] Add rating.

Core/Data/IReputationEntity.cs

@@ -0,0 +1,8 @@
+namespace Kruzya.TelegramBot.Core.Data;
+
+public interface IReputationEntity
+{
+    public long UserId { get; set; }
+    public long ChatId { get; set; }
+    public double Value { get; set; }
+}

Core/Service/IReputation.cs

@@ -1,4 +1,6 @@
-using System.Threading.Tasks;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Kruzya.TelegramBot.Core.Data;
 using Telegram.Bot.Types;
 
 namespace Kruzya.TelegramBot.Core.Service
@@ -9,5 +11,6 @@ namespace Kruzya.TelegramBot.Core.Service
         public Task<double> SetUserReputationAsync(Chat chat, User user, double value);
         public Task<double> GetReputationDiffAsync(Chat chat, User sender, User receiver);
         public Task IncrementReputationAsync(Chat chat, User user, double diff);
+        public Task<IEnumerable<IReputationEntity>> GetChatRatingAsync(Chat chat, int limit = 10, int offset = 0);
     }
 }

Core/Service/UserService.cs

@@ -3,7 +3,12 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
+using BotFramework.Abstractions;
+using Kruzya.TelegramBot.Core.Cache;
 using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using Telegram.Bot;
 using Telegram.Bot.Types;
 
 namespace Kruzya.TelegramBot.Core.Service
@@ -11,10 +16,17 @@ namespace Kruzya.TelegramBot.Core.Service
     public class UserService
     {
         private readonly List<long> _superUsers;
-
         private readonly Dictionary<long, string> _statusMap;
+        private readonly ICacheStorage<long, User> _userCache;
+        private readonly ITelegramBotClient _bot;
+        private readonly ILogger<UserService> _logger;
 
-        public UserService(IConfiguration configuration)
+
+        public UserService(
+            IConfiguration configuration, 
+            IBotInstance bot, 
+            ICacheStorage<long, User> userCache,
+            ILogger<UserService> logger)
         {
             _superUsers = configuration.GetSection("SuperUsers")
                 .GetChildren()
@@ -24,6 +36,41 @@ namespace Kruzya.TelegramBot.Core.Service
             _statusMap = configuration.GetSection("CustomMemberStatus")
                 .GetChildren()
                 .ToDictionary(x => Convert.ToInt64(x.Key), x => x.Value);
+
+            _userCache = userCache;
+            _bot = bot.BotClient;
+            _logger = logger;
+        }
+
+        public async Task<User> GetUser(long userId, long chatId, bool bypassCache = false)
+        {
+            if (bypassCache || !_userCache.TryGetValue(userId, out var user))
+            {
+                if (bypassCache)
+                {
+                    _logger.LogDebug("Bypassing cache.");
+                }
+                else
+                {
+                    _logger.LogDebug("User {UserId} is not found in cache. Fetching from Telegram API.", userId);
+                }
+
+                user = await GetUserByChat(chatId, userId);
+                CacheUser(user);
+            }
+         
+            return user;
+        }
+
+        private void CacheUser(User user)
+        {
+            // TODO: config entry for TTL
+            _userCache.SetValue(user.Id, user, Convert.ToInt32(TimeSpan.FromHours(1).TotalSeconds));
+        }
+        
+        private async Task<User> GetUserByChat(long chatId, long userId)
+        {
+            return (await _bot.GetChatMemberAsync(chatId, userId)).User;
         }
 
         public bool IsUserSuper(User user)