finalizare 1.0

backend/Application/Endpoints/Chats/SendMessage/SendMessageCommand.cs

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+namespace Application.Endpoints.Chats.SendMessage;
+
+public class SendMessageCommand
+{
+    public Guid Sender { get; set; } = Guid.Empty;
+    public Guid Receiver { get; set; } = Guid.Empty;
+    public string Message { get; set; } = string.Empty;
+}

backend/Application/Endpoints/Chats/SendMessage/SendMessageHandler.cs

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+using Application.Services.Database.MongoDB;
+using Application.Services.Database.PostgreSQL;
+using Domain.Entities;
+
+namespace Application.Endpoints.Chats.SendMessage;
+
+public class SendMessageHandler(
+    IChatMongoDbService chatMongoDbService,
+    IPatientRepository patientRepository,
+    IDoctorRepository doctorRepository)
+{
+    public async Task<BaseResponse> Handle(SendMessageCommand request, CancellationToken token)
+    {
+        var validation = new SendMessageValidator(doctorRepository, patientRepository);
+        var validationResult = await validation.ValidateAsync(request, token);
+
+        if (!validationResult.IsValid)
+        {
+            var firstError = validationResult.Errors.FirstOrDefault();
+            var errorCode = int.TryParse(firstError.ErrorCode, out var code) ? code : -1;
+            var errorMessage = firstError.ErrorMessage;
+
+            return new BaseResponse
+            {
+                StatusCode = errorCode,
+                Message = errorMessage,
+                Data = null
+            };
+        }
+
+        var chatId = IdentifierGenerator.GenerateId(request.Sender, request.Receiver);
+
+        var criteria = new List<(string, string)>();
+        criteria.Add(("_id", chatId));
+
+        var documents = await chatMongoDbService.FindAsync<Chat>(criteria, token);
+        if (!documents.Any())
+            return new BaseResponse
+            {
+                StatusCode = HttpStatusCodes.NotFound,
+                Message = "Access to medical history not found.",
+                Data = null
+            };
+
+        var chat = documents[0].Messages;
+        chat.Add(new Message(request.Sender, request.Message));
+
+        var newChat = new Chat();
+        newChat.SetId(chatId);
+        newChat.SetMessages(chat);
+
+        await chatMongoDbService.ModifyAsync("_id", chatId, newChat, token);
+
+        return new BaseResponse
+        {
+            StatusCode = HttpStatusCodes.NoContent,
+            Message = null,
+            Data = null
+        };
+    }
+}

backend/Application/Endpoints/Chats/SendMessage/SendMessageValidator.cs

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+using Application.Services.Database.PostgreSQL;
+using FluentValidation;
+
+namespace Application.Endpoints.Chats.SendMessage;
+
+public class SendMessageValidator : AbstractValidator<SendMessageCommand>
+{
+    private readonly IDoctorRepository _doctorRepository;
+    private readonly IPatientRepository _patientRepository;
+
+    public SendMessageValidator(IDoctorRepository doctorRepository, IPatientRepository patientRepository)
+    {
+        RuleFor(x => x.Sender)
+            .NotEmpty().WithMessage("Sender Id is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString());
+
+        RuleFor(x => x.Receiver)
+            .NotEmpty().WithMessage("Receiver Id is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString());
+
+        RuleFor(x => x.Message)
+            .NotEmpty().WithMessage("Message is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString());
+
+        RuleFor(x => x)
+            .MustAsync(CheckForUsersExistence).WithMessage("One of the users is not existing.")
+            .WithErrorCode(HttpStatusCodes.BadRequest.ToString());
+
+        _patientRepository = patientRepository;
+        _doctorRepository = doctorRepository;
+    }
+
+    private async Task<bool> CheckForUsersExistence(SendMessageCommand request, CancellationToken token)
+    {
+        var firstCheck = await _patientRepository.GetByIdAsync(request.Sender, token) != null &&
+                         await _doctorRepository.GetByIdAsync(request.Receiver, token) != null;
+
+        var secondCheck = await _patientRepository.GetByIdAsync(request.Receiver, token) != null &&
+                          await _doctorRepository.GetByIdAsync(request.Sender, token) != null;
+
+        return firstCheck || secondCheck;
+    }
+}