Stable server

was added removing messages
many fixes bugs and moving to result pattern from throwing exceptions

Govor.Application/Messages/MessageRemovingService.cs

@@ -1,6 +1,10 @@
 using Govor.Application.Messages.Parameters;
 using Govor.Domain;
+using Govor.Domain.Common;
+using Govor.Domain.Models.Messages;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
+using SmartRes;
 
 namespace Govor.Application.Messages;
 
@@ -17,8 +21,67 @@ public class MessageRemovingService : IMessageRemovingService
         _logger = logger;
     }
 
-    public Task<DeleteMessageResult> DeleteMessageAsync(DeleteMessage deleteParams)
+    public async Task<Result<Message,Error>> DeleteMessageAsync(DeleteMessage deleteParams)
     {
-        throw new NotImplementedException();
+       var message = await _govorDbContext.Messages.FirstOrDefaultAsync(m => m.Id == deleteParams.MessageId);
+      
+       if (message == null)
+           return Result<Message, Error>.Failure(
+               Error.NotFound(
+               "MessageRemoving",
+               "Message with given id doesn't exist")
+           );
+
+       var result = message.RecipientType switch
+       {
+           RecipientType.Group => await ValidateGroupRecipientAsync(message, deleteParams),
+           RecipientType.User => await ValidateUserRecipientAsync(message, deleteParams),
+           
+           _ => Result<Message, Error>.Failure(Error.Failure(
+                   "MessageRemoving.ArgumentOutOfRangeException",
+                   $"Argument out of range: {nameof(message.RecipientType)}"
+               )
+           )
+       };
+       
+       return result;
+    }
+
+    private async Task<Result<Message,Error>> ValidateGroupRecipientAsync(Message message, DeleteMessage deleteParams)
+    {
+        if (deleteParams.DeleterId == message.RecipientId)
+        {
+            return await ForceRemoveAsync(message);
+        }
+        else
+        {
+            // TODO made admin rules 
+            return Result<Message, Error>.Failure(Error.Failure("MessageRemoving.HaveNoPermission", 
+                $"You do not have permission to delete message {message.Id}"
+                ));
+        }
+    }
+
+    private async Task<Result<Message,Error>> ValidateUserRecipientAsync(Message message, DeleteMessage deleteParams)
+    {
+        if (deleteParams.DeleterId == message.RecipientId)
+        {
+           return await ForceRemoveAsync(message);
+        }
+        else
+        {
+           // TODO made hide rules
+           return Result<Message, Error>.Failure(Error.Failure("MessageRemoving.HaveNoPermission",
+               $"You do not have permission to delete message {message.Id}"
+               ));
+        }
+    }
+
+    private async Task<Result<Message, Error>> ForceRemoveAsync(Message message)
+    { 
+        _govorDbContext.Messages.Remove(message);
+        await _govorDbContext.SaveChangesAsync();
+            
+        return message;
     }
 }