///
/// Copyright (c) 2019-2023 Sensus Slovensko a.s.
///
using System;
using System.Windows.Forms;
using log4net;
using NHibernate;
using Common;
using GemCard;
using Users.Resources;
using System.Drawing;

namespace Users.Forms
{
    /// <summary>
    /// Provides login dialog as well as user authorization using TBF.User.Authorize(...)
    /// (i.e. when DialogResult is OK, user was authorized).
    /// </summary>
    public partial class PasswordChangeDlg : Form
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(PasswordChangeDlg));

        ISessionFactory[] sessionFactories;
        ISession session;

        /// <summary>
        /// Constructor
        /// </summary>
        private PasswordChangeDlg()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Constructor with a predefined user.
        /// </summary>
        public PasswordChangeDlg(ISessionFactory[] sessionFactories, string predefinedUser = null)
        {
            InitializeComponent();
            this.sessionFactories = sessionFactories;
            this.session = null;
            if (predefinedUser != null) userNameTextBox.Text = predefinedUser;
        }

        /// <summary>
        /// Constructor with a predefined user.
        /// </summary>
        public PasswordChangeDlg(ISession session, string predefinedUser = null)
        {
            InitializeComponent();
            this.sessionFactories = null;
            this.session = session;
            if (predefinedUser != null) userNameTextBox.Text = predefinedUser;
        }


        private void LoginDlg_Load(object sender, EventArgs e)
        {
			Localize();

            if (string.IsNullOrEmpty(userNameTextBox.Text))
            {
                userNameTextBox.Enabled = true;
                userNameTextBox.Select();
            }
            else
            {
                oldPasswTextBox.Select();
            }
        }

		void Localize()
		{
            Text = Strings.Change_your_password_please;
			userNameLabel.Text = Strings.User_name;
			oldPasswLabel.Text = Strings.Old_password;
            newPasswLabel.Text = Strings.New_password;
            newPasswVerifLabel.Text = Strings.New_password_verification;
			okButton.Text = Strings.OkBtnText;
			cancelButton.Text = Strings.CancelBtnText;
		}

        /// <summary>
        /// Try to authorize the user when OK clicked.
        /// </summary>
        private void okButton_Click(object sender, EventArgs e)
        {
            string userName = userNameTextBox.Text;
            string oldPassword = oldPasswTextBox.Text;

			if (Entities.User.IsPowerUser(userName, oldPassword))
			{
                MessageBox.Show(Strings.Power_user_cannot_change_its_password, Strings.Warning, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                DialogResult = DialogResult.OK;
				Close();
                return;
            }

            string explanation;
            if (newPasswTextBox.Text != newPasswVerifTextBox.Text)
            {
                MessageBox.Show(Strings.New_password_and_its_verification_are_different, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Hand);
                DialogResult = DialogResult.None;
                return;
            }
            else if (!Entities.User.IsPasswordMeetsRequirements(newPasswTextBox.Text, out explanation))
            {
                MessageBox.Show(Strings.Password_does_not_meet_requirements + Environment.NewLine + explanation,
                                Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Hand);
                DialogResult = DialogResult.None;
                return;
            }

            AuthorizedAs authorizedAs = AuthorizedAs.RemoteUser;
            Users.Entities.User loadedUser = null;
            ///
            bool oldPasswdOK = false;
			if (!oldPasswdOK)
			{
                if (sessionFactories != null)
                {
                    foreach (var sf in sessionFactories)
                    {
                        ISession sess = null;
                        try
                        {
                            sess = sf.OpenSession();
                            loadedUser = Users.Entities.User.LoadUserByName(sess, userName);
                            if (loadedUser != null)
                            {
                                oldPasswdOK = (userName == loadedUser.UserName) && loadedUser.IsCorrectPassword(oldPassword);
                            }

                            if (oldPasswdOK)
                            {
                                if (loadedUser.IsPasswordUsedInPast(newPasswTextBox.Text))
                                {
                                    sess.Close();
                                    MessageBox.Show(Strings.Password_has_been_used_in_past, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Hand);
                                    DialogResult = DialogResult.None;
                                    return;
                                }

                                ///
                                /// Now the password is changed in database that was used to authorize the user
                                ///
                                loadedUser.SetPassword(newPasswTextBox.Text);
                                sess.SaveOrUpdate(loadedUser);
                                sess.Flush();
                                sess.Close();

                                DialogResult = DialogResult.OK;
                                Close();
                                return;
                            }
                        }
                        catch (Exception)
                        {
                            log.ErrorFormat("Cannot load a list of users from a database");
                        }
                        finally
                        {
                            if (sess != null && sess.IsOpen) sess.Close();
                        }

                        if (oldPasswdOK) break;

                        authorizedAs = AuthorizedAs.LocalUser;
                    }
                }
                else if (session != null)
                {
                    /// This session was already open so consequently it is not closed after loading the user
                    try
                    {
                        loadedUser = Users.Entities.User.LoadUserByName(session, userName);
                        if (loadedUser != null)
                        {
                            oldPasswdOK = (userName == loadedUser.UserName) && loadedUser.IsCorrectPassword(oldPassword);
                        }
                    }
                    catch (Exception)
                    {
                        log.ErrorFormat("Cannot load a list of users from a database");
                    }

                    authorizedAs = AuthorizedAs.LocalUser;

                    if (oldPasswdOK && session != null && session.IsOpen)
                    {
                        if (loadedUser.IsPasswordUsedInPast(newPasswTextBox.Text))
                        {
                            MessageBox.Show(Strings.Password_has_been_used_in_past, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Hand);
                            DialogResult = DialogResult.None;
                            return;
                        }

                        ///
                        /// Now the password is changed in database that was used to authorize the user
                        ///
                        loadedUser.SetPassword(newPasswTextBox.Text);
                        session.SaveOrUpdate(loadedUser);
                        session.Flush();

                        DialogResult = DialogResult.OK;
                        Close();
                        return;
                    }
                }
			}

            MessageBox.Show(Strings.Invalid_username_or_password, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Hand);
            DialogResult = DialogResult.None;
            return;
        }

        /// <summary>
        /// Cancel clicked, do not try to authorize.
        /// </summary>
        private void cancelButton_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.Cancel;
            Close();
            return;
        }

        private void userNameTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13)
            {
                oldPasswTextBox.Focus();
            }
        }

        private void passwordTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13)
            {
                newPasswTextBox.Focus();
            }
        }

        private void newPasswTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13)
            {
                newPasswVerifTextBox.Focus();
            }
        }

        private void newPasswVerifTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (Convert.ToInt32(e.KeyChar) == 13)
            {
                okButton_Click(sender, e);
            }
        }
    }
}