using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace UserLogin
{
    class LoginValidation
    {
        private string username;
        private string password;
        private string errorMessage;

        public LoginValidation(string username, string password)
        {
            this.username = username;
            this.password = password;
        }

        public static UserRoles currentUserRole
        {
            get;

            private set;
        }

        public string ErrorMessage { get; private set; }

        public bool ValidateUserInput(User user)
        {

            bool emptyUsername;
            emptyUsername = username.Equals(String.Empty);
            if (emptyUsername)
            {
                ErrorMessage = "No username given!";
                return false;
            }

            bool emptyPassword;
            emptyPassword = password.Equals(String.Empty);
            if (emptyPassword)
            {
                ErrorMessage = "No password given!";
                return false;
            }

            if (username.Length < 5)
            {
                ErrorMessage = "Username must be at least 5 symbols long!";
                return false;
            }

            if (password.Length < 5)
            {
                ErrorMessage = "Password too short!";
                return false;
            }

            User match = UserData.IsUserPassCorrect(username, password);

            if (match != null)
            {
                user.username = match.username;
                user.password = match.password;
                user.facNum = match.facNum;
                user.role = match.role;

                currentUserRole = (UserRoles)match.role;
            }
            else
            {
                ErrorMessage = "Username or password is incorrect!";
                return false;
            }

            return true;
        }
    }
}