using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Security.Cryptography;

namespace PokerStarsBotClientv2
{
    public partial class LoginForm : Form
    {
        // Constructor
        public LoginForm()
        {
            InitializeComponent();
            LoadCreedentials();
            this.Text += " v" + Globals.LocalVersion;
            HelperMethods.GetConfigFromDB();            
        }

        // Methods
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            CompareVersions();
        }

        private void CompareVersions()
        {
            // Version comparing
            var result = Globals.RecentVersion.CompareTo(Globals.LocalVersion);
            if (result > 0)
            {
                DialogResult dialogResult = MessageBox.Show("There is a newer client version available:\n\nYour version: " + Globals.LocalVersion + "\nNewest version: " + Globals.RecentVersion + "\n\nPlease update asap.\nOpen website now?", "Update PkrStarsBot", MessageBoxButtons.YesNo);
                if (dialogResult == DialogResult.Yes)
                {
                    System.Diagnostics.Process.Start(Globals.PkrStarsBotURL);                    
                }
                Application.Exit();
            }            
        }
        private void checkBoxRememberMe_CheckedChanged(object sender, EventArgs e)
        {
            // Delete credentials is checkbox is not checked
            if (checkBoxRememberMe.Checked == false)
            {
                Properties.Settings.Default.UserName = string.Empty;
                Properties.Settings.Default.Password = string.Empty;
                Properties.Settings.Default.Save();
            }
        }
        private void LoadCreedentials()
        {
            if (Properties.Settings.Default.UserName != string.Empty && Properties.Settings.Default.Password != string.Empty)
            {
                textBoxUser.Text = Properties.Settings.Default.UserName;
                textBoxPassword.Text = Properties.Settings.Default.Password;
                checkBoxRememberMe.Checked = true;
                EnableDisableLoginButton();
            }
        }
        public void EnableDisableLoginButton()
        {
            if (string.IsNullOrWhiteSpace(textBoxUser.Text) || string.IsNullOrWhiteSpace(textBoxPassword.Text))
            {
                btnLogin.Enabled = false;
            }
            else
            {
                btnLogin.Enabled = true;
            }
        }
        public string CalculateMD5Hash(string input)
        {
            // Calculate MD5 hash from input
            MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
            byte[] hash = md5.ComputeHash(inputBytes);

            // Convert byte array to hex string
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hash.Length; i++)
            {

                sb.Append(hash[i].ToString("X2"));
            }

            return sb.ToString();
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            try
            {
                // Connect to DB
                var dbCon = DBConnection.Instance();
                if (dbCon.IsConnect())
                {
                    // Username & password
                    string Username = textBoxUser.Text;
                    string Password = textBoxPassword.Text;
                    string PasswordMD5 = CalculateMD5Hash(Password);
                    string Count1 = "";

                    // Query
                    string query = "SELECT count(1) FROM `reg_users` WHERE `EMail` = @UserName AND `Password` = @PassWord;";

                    // SQL: Check username & password
                    var cmd = new MySqlCommand(query, dbCon.Connection);
                    cmd.Parameters.AddWithValue("@UserName", Username);
                    cmd.Parameters.AddWithValue("@PassWord", PasswordMD5);
                    var reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        Count1 = reader.GetString(0);
                    }
                    reader.Close();

                    // Login successful
                    if (Count1 == "1")
                    {
                        // Save credentials if checked
                        if (checkBoxRememberMe.Checked == true)
                        {
                            Properties.Settings.Default.UserName = Username;
                            Properties.Settings.Default.Password = Password;
                            Properties.Settings.Default.Save();
                        }
                        else
                        {
                            Properties.Settings.Default.UserName = Username;
                            Properties.Settings.Default.Save();
                        }

                        // Hide Login, show up main
                        this.Hide();
                        MainForm MainForm = new MainForm();
                        MainForm.Show();
                           
                    }
                    else if (Count1 == "0") // Login unsuccessful
                    {
                        MessageBox.Show("LOGIN FAILED", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }

                    // Close DB connection
                    dbCon.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void textBoxUser_KeyUp(object sender, KeyEventArgs e)
        {
            EnableDisableLoginButton();
        }

        private void textBoxPassword_KeyUp(object sender, KeyEventArgs e)
        {
            EnableDisableLoginButton();
        }

        private void LoginForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
        }

        private void z(object sender, EventArgs e)
        {

        }
    }
}

/*namespace Data
{
    public class DBConnection
    {
        // Fields
        private string mysqlServer = "zinomedia.de";
        private string mysqlUser = "pkrstarsbot";
        private string mysqlPassword = "ichpkrstarsbot#1337";
        private string mysqlDatabase = "pkrstarsbot";

        private MySqlConnection connection = null;
        public MySqlConnection Connection
        {
            get { return connection; }
        }

        private static DBConnection _instance = null;
        public static DBConnection Instance()
        {
            if (_instance == null)
                _instance = new DBConnection();
            return _instance;
        }

        public bool IsConnect()
        {
            bool result = true;
            if (Connection == null)
            {
                if ((mysqlDatabase ?? mysqlPassword ?? mysqlServer ?? mysqlUser) == null)
                {
                    return false;
                }
                string connstring = string.Format(@"server={0};user id={1};persistsecurityinfo=True;database={2};password={3}", mysqlServer, mysqlUser, mysqlDatabase, mysqlPassword);
                connection = new MySqlConnection(connstring);
                connection.Open();
                result = true;
            }

            return result;
        }

        public void Close()
        {
            connection.Close();
            _instance = null;
        }
    }
}*/