using FluentValidation;
using Galaeth.Services.Dtos;
using Galaeth.Services.Interfaces;
using Injectio.Attributes;

namespace Galaeth.Services.Validators;

/// <summary>
/// Validation for <see cref="CreateUserDto"/>.
/// </summary>
[RegisterScoped]
public class CreateUserValidator : AbstractValidator<CreateUserDto>
{
    private const int MinimumUsernameLength = 4;
    private const int MaximumUsernameLength = 16;

    /// <summary>
    /// Initializes a new instance of the <see cref="CreateUserValidator"/> class.
    /// </summary>
    /// <param name="emailDomainBlacklistService">Instance of <see cref="IEmailDomainBlacklistService"/>.</param>
    public CreateUserValidator(IEmailDomainBlacklistService emailDomainBlacklistService)
    {
        RuleFor(dto => dto.Username).NotEmpty().WithMessage("Username must be provided")
            .MinimumLength(MinimumUsernameLength)
            .WithMessage("Username must be a minimum of " + MinimumUsernameLength + " characters")
            .MaximumLength(MaximumUsernameLength)
            .WithMessage("Username must be within " + MaximumUsernameLength + " characters")
            .Matches(@"^[A-Za-z0-9._-]+$")
            .WithMessage("Username can only contain letters, numbers, hyphens, dashes and periods.");

        RuleFor(dto => dto.Email).NotEmpty().WithMessage("Email address must be provided")
            .EmailAddress().WithMessage("Email address is not a valid email address");

        RuleFor(dto => dto.Email).MustAsync(async (email, _) =>
        await emailDomainBlacklistService.CheckBlacklist(email) == false)
            .WithMessage("Email addresses from this domain cannot be used");

        RuleFor(dto => dto.Password).NotEmpty().WithMessage("Password must be provided");
    }
}