using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace SecureCore.Services
{
    public static class UserDataService
    {
        //
        public static int UserNameMaxLength { get; } = 64;

        public static (bool IsValid, string Message) IsUsernameValid(string userName)
        {
            if (userName.Length > UserNameMaxLength) return (false, $"Username too long, must not exceed {UserNameMaxLength} characters.");

            var invalidChars = new List<char>();

            foreach(var c in userName)
                if (char.IsPunctuation(c) || char.IsSymbol(c) || char.IsControl(c) || char.IsSeparator(c) || char.IsWhiteSpace(c)) invalidChars.Add(c);

            if (invalidChars.Count > 0) return (false, $"The character(s) '{string.Join(",", invalidChars)}' are not allowed in a user name.");

            return (true, string.Empty);
        }

        public static int RegisterNewUser(string userName, string email, string passwordHash, string saltHash, string sessionToken, DateTime expirationDate, string userAgent, string ipAddress, string connectionString)
        {
            using var connection = new SqlConnection(connectionString);

            using var command = new SqlCommand("RegisterNewUser", connection) { CommandType = CommandType.StoredProcedure };

            command.Parameters.AddWithValue("UserName", userName);
            command.Parameters.AddWithValue("Email", email);
            command.Parameters.AddWithValue("Password", passwordHash);
            command.Parameters.AddWithValue("Salt", saltHash);
            command.Parameters.AddWithValue("SessionToken", sessionToken);
            command.Parameters.AddWithValue("ExpirationDate", expirationDate);
            command.Parameters.AddWithValue("UserAgent", userAgent);
            command.Parameters.AddWithValue("IpAddress", ipAddress);

            connection.Open();

            var result = command.ExecuteScalar();

            return Convert.ToInt32(result);
        }
    }
}