Biskilog/BISKILOG POS PREMIUM/Dialogs/ResumeSession.cs

using BiskLog_Point_Of_Sale.Company_Setup;
using Point_Of_Sale_Managment;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BiskLog_Point_Of_Sale.Multiple_Login
{
    public partial class ResumeSession : Form
    {
        public bool SuccessfulLogin = false;
        public bool ElseWhere = false;
        public bool DifferentUser = false;
        SqlConnection cn;
        SqlCommand cm;
        SqlDataReader dr;
        DatabaseConn conn = new DatabaseConn();
        public ResumeSession()
        {
            InitializeComponent();
            cn = new SqlConnection(conn.MyConnection());
        }
        private void Label2_Click(object sender, EventArgs e)
        {
            this.DifferentUser = true;
            this.DialogResult = DialogResult.OK;
            this.Close();
        }
        private async void BtnLogin_Click_1(object sender, EventArgs e)
        {
            Task<int> task = new Task<int>(available);
            loading.Visible = true;
            btnLogin.Enabled = false;
            task.Start();
            int result = await task;
            if (result == 1)
            {
                this.SuccessfulLogin = true;
                this.ElseWhere = false;
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            else if (result == 3)
            {
                this.SuccessfulLogin = false;
                this.ElseWhere = true;
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            else if (result == 5)
            {
                string title = "Wrong password";
                string message = "Sorry unable to login as you have entered a wrong password";
                NoAction noAction = new NoAction(title, message);
                noAction.BringToFront();
                noAction.ShowDialog();
            }
            else if (result == 10)
            {
                string title = "Error Occurred";
                string message = "Sorry error authenticating user, please try again later";
                NoAction noAction = new NoAction(title, message);
                noAction.BringToFront();
                noAction.ShowDialog();
            }
            else
            {
                string title = "Multiple logins not allowed";
                string message = "Sorry unable to login as user has already logged in from a different workstation";
                NoAction noAction = new NoAction(title, message);
                noAction.BringToFront();
                noAction.ShowDialog();
            }
            loading.Visible = false;
            btnLogin.Enabled = true;
        }

        private void ResumeSession_Load(object sender, EventArgs e)
        {
            label5.Text = MainLogin.login_user;
        }
        public int available()
        {
            try
            {
                if (reAuth())
                {
                    cn.Open();
                    cm = new SqlCommand("Declare @retu varchar(50) set @retu = case when(Select username from tblUser_activity where username = @username and workstation = @workstation) " +
                        "IS NOT NULL then 1 else 0 end Declare @active int = (Select DATEDIFF(ss, last_active, CURRENT_TIMESTAMP) from tblUser_activity where username = @username) Select " +
                        "(case when @active >= 3 then 1 else 0 end) as CanLogin, @retu as NotElsewhere", cn);
                    cm.Parameters.AddWithValue("@username", label5.Text);
                    cm.Parameters.AddWithValue("@workstation", Splashscreen.macAddress);
                    cm.ExecuteNonQuery();
                    dr = cm.ExecuteReader();
                    dr.Read();
                    if (dr.HasRows)
                    {
                        if ((dr[0].ToString() == "1") && (dr[1].ToString() == "1"))
                        {
                            dr.Close();
                            cn.Close();
                            return 1;
                        }
                        else if ((dr[0].ToString() == "0") && (dr[1].ToString() == "1"))
                        {
                            dr.Close();
                            cn.Close();
                            return 2;
                        }
                        else if ((dr[0].ToString() == "1") && (dr[1].ToString() == "0"))
                        {
                            dr.Close();
                            cn.Close();
                            return 3;
                        }
                        else
                        {
                            dr.Close();
                            cn.Close();
                            return 4;
                        }
                    }
                    else
                    {
                        dr.Close();
                        cn.Close();
                        return 0;
                    }
                }
                else
                {
                    return 5;
                }
            }
            catch(SqlException) 
            {
                cn.Close();
                return 10;
            }
            catch
            {
                cn.Close();
                return 0;
            }
        }
        public bool reAuth()
        {
            if (passwordEncryption.Decrypt(Splashscreen.ppd).Equals(txtpassword.Text))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}