using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
using System.ComponentModel.DataAnnotations;
using System.Globalization;

namespace Ophelias.Expressions
{
    internal static class Expressions
    {
        internal static Regex CardRx = new Regex(@"^[0-9]{16}$", RegexOptions.Compiled);
        internal static Regex ExpriationRx = new Regex(@"^(0?[1-9]|1[012])/2[0-9]{1}$", RegexOptions.Compiled);
        internal static Regex CCVRx = new Regex(@"^[0-9]{3}$", RegexOptions.Compiled);
        internal static Regex MoneyRx = new Regex(@"^(\d+\.\d{2}|\d+)$", RegexOptions.Compiled);
    }
    internal static class Validation
    {
        internal static bool ValidateCreditCard(string CreditCard)
        {
            return Expressions.CardRx.IsMatch(CreditCard);
        }
        internal static bool ValidateExpirationDate(string Expiration)
        {
            if (Expressions.ExpriationRx.IsMatch(Expiration))
            {
                DateTime dt = DateTime.ParseExact(Expiration, "MM/yy", CultureInfo.InvariantCulture);
                if (dt.Date >= DateTime.Now.Date)
                    return true;
            }
            return false;
        }
        internal static bool ValidateExpirationNotBeforeReservation(string Expiration, DateTime CollectionDate)
        {
            DateTime dt = DateTime.ParseExact(Expiration, "MM/yy", CultureInfo.InvariantCulture);
            if (dt.Date > CollectionDate.Date)
                return true;
            return false;
        }
        internal static bool ValidateEmail(string email)
        {
            EmailAddressAttribute EmailChecker = new EmailAddressAttribute();
            return EmailChecker.IsValid(email);
        }
        internal static bool ValidateCCV(string CCV)
        {
            if (Expressions.CCVRx.IsMatch(CCV))
                return true;
            return false;
        }
        internal static bool ValidateMoney(string Money)
        {
            return Expressions.MoneyRx.IsMatch(Money);
        }

    }
}