rework and starts for new friends system

Govor.Application/Services/MessagesLoader.cs

@@ -0,0 +1,43 @@
+using Govor.Application.Interfaces;
+using Govor.Core.Models;
+using Govor.Core.Repositories.Groups;
+using Govor.Core.Repositories.Messages;
+using Govor.Data.Repositories.Exceptions;
+
+namespace Govor.Application.Services;
+
+public class MessagesLoader : IMessagesLoader
+{
+    private IVerifyFriendship _friendship;
+    private IGroupsRepository _groupsRepository;
+    private IMessagesRepository _messagesRepository;
+    
+    public async Task<List<Message>> LoadLastMessagesInUserChat(Guid userId, Guid currentUser, Guid? startMessageId, int pageSize = 20)
+    {
+        await _friendship.VerifyAsync(userId, currentUser);
+        try
+        {
+            throw new NotImplementedException();
+            //return await _groups.GetMessages(userId, startMessageId, pageSize);
+        }
+        catch (NotFoundException ex)
+        {
+            return new List<Message>();
+        }
+    }
+
+    public async Task<List<Message>> LoadLastMessagesInChatGroup(Guid chatId, Guid currentUser, Guid? startMessageId, int pageSize = 20)
+    {
+        if(!await _groupsRepository.IsUserMemberOfGroupAsync(currentUser, chatId))
+            throw new UnauthorizedAccessException("You are not in a group.");
+        try
+        {
+            throw new NotImplementedException();
+            //return await _groups.GetMessages(chatId, startMessageId, pageSize, RecipientType.Group);
+        }
+        catch (NotFoundException ex)
+        {
+            return new List<Message>();
+        }
+    }
+}