using Application.Services.Database.PostgreSQL;
using Application.Services.HashingAlgorithms;
using Domain;
using FluentValidation;

namespace Application.Endpoints.Authorization.UserRegister;

public class UserRegisterValidator : AbstractValidator<UserRegisterCommand>
{
    private readonly IAdminRepository _adminRepository;
    private readonly IDoctorRepository _doctorRepository;
    private readonly IPatientRepository _patientRepository;

    public UserRegisterValidator(IPatientRepository patientRepository,
        IDoctorRepository doctorRepository, IAdminRepository adminRepository)
    {
        _patientRepository = patientRepository;
        _doctorRepository = doctorRepository;
        _adminRepository = adminRepository;

        RuleFor(x => x.Name)
            .NotEmpty().WithMessage("Name is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString())
            .MaximumLength(30).WithMessage("Maximum name length of 30 characters")
            .WithErrorCode(HttpStatusCodes.BadRequest.ToString());

        RuleFor(x => x.Email)
            .NotEmpty().WithMessage("Email is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString())
            .EmailAddress().WithMessage("Invalid email format.").WithErrorCode(HttpStatusCodes.BadRequest.ToString())
            .MustAsync(async (email, token) => await AccountNotRegistered(email, token))
            .WithMessage("Account already registered in system.").WithErrorCode(HttpStatusCodes.BadRequest.ToString());

        RuleFor(x => x.Password)
            .NotEmpty().WithMessage("Password is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString())
            .MinimumLength(8).WithMessage("Password must be at least 8 characters long.")
            .WithErrorCode(HttpStatusCodes.BadRequest.ToString());

        RuleFor(x => x.Role)
            .NotEmpty().WithMessage("Role is required.").WithErrorCode(HttpStatusCodes.BadRequest.ToString())
            .Must(BeAValidRole).WithMessage("Invalid role specified.")
            .WithErrorCode(HttpStatusCodes.BadRequest.ToString());
    }

    private bool BeAValidRole(string role)
    {
        var validRoles = new[] { UserRoles.Admin, UserRoles.Doctor, UserRoles.Patient };
        return validRoles.Contains(role);
    }

    private async Task<bool> AccountNotRegistered(string email, CancellationToken token)
    {
        var patient = await _patientRepository.FindByEmailAsync(email, token);
        var doctor = await _doctorRepository.FindByEmailAsync(email, token);
        var admin = await _adminRepository.FindByEmailAsync(email, token);

        return patient == null && doctor == null && admin == null;
    }
}