finalizare 1.0

backend/Application/Endpoints/Chats/GetChats/GetConversationsCommand.cs

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+namespace Application.Endpoints.Chats.GetChats;
+
+public class GetConversationsCommand
+{
+    public Guid IdUser1 { get; set; } = Guid.Empty;
+    public Guid IdUser2 { get; set; } = Guid.Empty;
+}

backend/Application/Endpoints/Chats/GetChats/GetConversationsHandler.cs

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+using Application.Services.Database.MongoDB;
+using Application.Services.Database.PostgreSQL;
+using Domain.Entities;
+
+namespace Application.Endpoints.Chats.GetChats;
+
+public class GetConversationsHandler(
+    IChatMongoDbService chatMongoDbService,
+    IPatientRepository patientRepository,
+    IDoctorRepository doctorRepository)
+{
+    public async Task<BaseResponse> HandleGetConversation(GetConversationsCommand getConversationCommand,
+        CancellationToken token)
+    {
+        var validation = new GetConversationsValidator(doctorRepository, patientRepository);
+        var validationResult = await validation.ValidateAsync(getConversationCommand, 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(getConversationCommand.IdUser1, getConversationCommand.IdUser2);
+
+        var criteria = new List<(string, string)>();
+        criteria.Add(("_id", chatId));
+
+        Chat? chat = null;
+
+        var documents = await chatMongoDbService.FindAsync<Chat>(criteria, token);
+        if (!documents.Any())
+        {
+            chat = new Chat();
+            chat.SetId(chatId);
+
+            await chatMongoDbService.AddAsync(chat, token);
+        }
+        else
+        {
+            chat = documents[0];
+        }
+
+        return new BaseResponse
+        {
+            StatusCode = HttpStatusCodes.OK,
+            Message = "Fetching messages.",
+            Data = chat
+        };
+    }
+}

backend/Application/Endpoints/Chats/GetChats/GetConversationsValidator.cs

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+using Application.Services.Database.PostgreSQL;
+using FluentValidation;
+
+namespace Application.Endpoints.Chats.GetChats;
+
+public class GetConversationsValidator : AbstractValidator<GetConversationsCommand>
+{
+    private readonly IPatientRepository _patientRepository;
+    private readonly IDoctorRepository _doctorRepository;
+
+    public GetConversationsValidator(IDoctorRepository doctorRepository, IPatientRepository patientRepository)
+    {
+        RuleFor(x => x.IdUser1)
+            .NotEmpty().WithMessage("IdUser1 is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString());
+
+        RuleFor(x => x.IdUser2)
+            .NotEmpty().WithMessage("IdUser2 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(GetConversationsCommand request, CancellationToken token)
+    {
+        var firstCheck = await _patientRepository.GetByIdAsync(request.IdUser1, token) != null &&
+                         await _doctorRepository.GetByIdAsync(request.IdUser2, token) != null;
+
+        var secondCheck = await _patientRepository.GetByIdAsync(request.IdUser2, token) != null &&
+                          await _doctorRepository.GetByIdAsync(request.IdUser1, token) != null;
+
+        return firstCheck || secondCheck;
+    }
+}