using MySql.Data.MySqlClient;
using PaymentLogs.Domain;
using PaymentLogs.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace PaymentLogs.Repositories
{
    internal class UserRepo : Repo<string, User>
    {

        public override void Load()
        {
            DataBase db = new DataBase();
            _data.Clear();
            string sql = " SELECT * FROM usrs  ";
            db.openConnection();
            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
            MySqlDataReader reader = cmd.ExecuteReader();

            while (reader.Read()) {
                User user = new User() { Login = reader.GetString("login"), PasswordHash = StringUtils.ConvertToSecureString(reader.GetString("password_hash")) };
                _data[user.Login] = user;
            }
            db.closeConnection();
        }



        public void RegisterUser(string _login, string _password)
        {
            User user = new User() { Login =  _login.ToLower(), PasswordHash = StringUtils.ConvertToSecureString(StringUtils.SHA256_hash(_password)) };
            Save(user);
        }

        public Boolean HasUser(string _login)
        {
            return _data.ContainsKey(_login.ToLower());
        }


        private void Save(User user)
        {
            DataBase db = new DataBase();
            db.openConnection();
            string hash = StringUtils.SecureStringToString(user.PasswordHash);
            string sql = $" INSERT INTO `usrs` (`login`, `password_hash`) VALUES ('{user.Login}','{hash}') " +
                $"ON DUPLICATE KEY UPDATE `password_hash`='{hash}'";
            MySqlCommand cmd = new MySqlCommand(sql, db.getConnection());
            cmd.ExecuteNonQuery();
            db.closeConnection();
        }


        public override void Save()
        {
            foreach(User user in _data.Values)
            {
                Save(user);
            }
        }
    }
}