FACULTATE-HEALTHCARE_MANAGER/backend/Application/Endpoints/Chats/SendMessage/SendMessageValidator.cs

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;
    }
}