///
/// Copyright (c) 2017-2018 Sensus Slovensko a.s.
///
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using NHibernate;
using Common;
using Common.Forms;
using Users.Entities;
using Users.Resources;


namespace Users.Forms
{
    public partial class UserManagementDlg: Form
    {
        const int UserNumberColumn = 1;
        const int NameSurnameColumn = 2;


        IList<Group> displayedGroups;
        public string TitleExtension;
        

        NHibernate.ISession session;
        bool showExtensions;
        IList<User> listOfUsers;
        int lastSelectedIndex;

        MySortOrder sortOrder = MySortOrder.Ascending;
        int sortColumn = -1;                        /// 0-based index of column to be used for sorting


        public UserManagementDlg(NHibernate.ISession session, bool showLocalExtensions)
        {
            InitializeComponent();
            this.session = session;
            this.showExtensions = showLocalExtensions;
            if (showLocalExtensions) copyFromRemoteButton.Visible = true;

            try
            {
                IList<Group> allGroups = session.QueryOver<Group>().List();

                ///
                /// Selects groups to be displayed (so that each GID is present only once)
                ///
                Group[] dspGroups = new Group[(int)Common.GID.NrOfGroups];
                foreach (var group in allGroups)
                {
                    if ((group.GID >= 0) && (group.GID < Common.GID.NrOfGroups) && (dspGroups[(int)group.GID] == null))
                    {
                        dspGroups[(int)group.GID] = group;
                    }
                }
                displayedGroups = new List<Group>();
                foreach (var group in dspGroups)
                {
                    if (group != null) displayedGroups.Add(group);
                }

                listOfUsers = session.QueryOver<User>().List();
            }
            catch (Exception)
            {
                if (displayedGroups == null) displayedGroups = new List<Group>();
                if (listOfUsers == null) listOfUsers = new List<User>();
            }


        }

		private void UserManagementDlg_Load(object sender, EventArgs e)
		{
            /// Program version string
            Version ver = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            string version = string.Format("{0}.{1}.{2}", ver.Major, ver.Minor, ver.Build);

            Text = string.Format(string.IsNullOrEmpty(TitleExtension) ? "{0} ver.{1}" : "{0} ver.{1} : {2}", Strings.User_Management, version, TitleExtension);
			addButton.Text = Strings.AddBtnText;
			editButton.Text = Strings.EditBtnText;
			deleteButton.Text = Strings.RemoveBtnText;
			closeButton.Text = Strings.CloseBtnText;

			listViewUsers.Columns.Add(Strings.User_name, 100);  /// column 0
            listViewUsers.Columns.Add(Strings.User_code, 70);   /// column 1: UserNumberColumn
            listViewUsers.Columns.Add(Strings.Full_name, 150);  /// column 2: NameSurnameColumn
            listViewUsers.Columns.Add(Strings.Tag,       110);
            listViewUsers.Columns.Add(Strings.Groups,    370);

            ListUsers();
        }

        public void ListUsers()
		{
            listViewUsers.Items.Clear();
            foreach (User u in listOfUsers)
            {
                ListViewItem item = new ListViewItem(u.UserName);
                item.Tag = u;
                item.SubItems.Add(u.Number.ToString());
                item.SubItems.Add(u.FullName);
                item.SubItems.Add(string.IsNullOrEmpty(u.Tag) ? string.Empty : u.Tag);

                /// Show groups of this user
                string grps = string.Empty;
                foreach (var group in displayedGroups)
                {
                    if (u.IsMemberOf(group.GID))
                    {
                        if (!string.IsNullOrEmpty(grps)) grps += ", ";
                        grps += group.Gid2Str();
                    }
                }
                item.SubItems.Add(grps);

                this.listViewUsers.Items.Add(item);
            }
            this.listViewUsers.Refresh();
        }

        private void closeButton_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        
        private void RefreshButtonStates()
		{
            editButton.Enabled = (listViewUsers.SelectedItems.Count > 0);
            deleteButton.Enabled = (listViewUsers.SelectedItems.Count >  0);
        }

        private void listViewUsers_SelectedIndexChanged(object sender, EventArgs e)
        {
            RefreshButtonStates();
            if (listViewUsers.SelectedItems.Count > 0)
            {
                lastSelectedIndex = listViewUsers.SelectedItems[0].Index;
            }
            else
			{
                lastSelectedIndex = -1;
            }
        }


        private void listViewUsers_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            if (e.Column == sortColumn)
            {
                /// Clicked on the same column header => increment to the next applicable MySortOrder
                if (e.Column == NameSurnameColumn)
                {
                    sortOrder++;
                    if (sortOrder > MySortOrder.Descending2) sortOrder = MySortOrder.Ascending;
                }
                else
                {
                    sortOrder = (sortOrder == MySortOrder.Ascending) ? MySortOrder.Descending : MySortOrder.Ascending;
                }
            }
            else
            {
                /// Clicked on another column header => set sortOrder to MySortOrder.Ascending
                sortColumn = e.Column;
                sortOrder = MySortOrder.Ascending;
            }

            if (sortColumn == UserNumberColumn)
            {
                listViewUsers.ListViewItemSorter = new LviIntColumnComparer(sortColumn, sortOrder);
            }
            else if (sortColumn == NameSurnameColumn)
            {
                listViewUsers.ListViewItemSorter = new LviNameSurnameColumnComparer(sortColumn, sortOrder);
            }
            else
            {
                listViewUsers.ListViewItemSorter = new LviTextColumnComparer(sortColumn, sortOrder);
            }

            listViewUsers.SetSortIcon(sortColumn, sortOrder);
            listViewUsers.Sort();
        }

        private void editButton_Click(object sender, EventArgs e)
        {
            if (listViewUsers.SelectedItems.Count == 1 && listViewUsers.SelectedItems[0].Tag is User)
            {
                new Forms.EditSelectedUser(session, (User)listViewUsers.SelectedItems[0].Tag, displayedGroups).ShowDialog();
                ListUsers();
            }
        }

        private void listViewUsers_DoubleClick(object sender, EventArgs e)
        {
            editButton_Click (sender, e);
        }

        private void addButton_Click(object sender, EventArgs e)
        {
            User newUser = new User();
            if (new Forms.EditSelectedUser(session, newUser, displayedGroups).ShowDialog() == DialogResult.OK)
            {
                listOfUsers.Add(newUser);
            }
            ListUsers();
        }

        private void deleteButton_Click(object sender, EventArgs e)
        {
            if (listViewUsers.SelectedItems.Count == 1 && listViewUsers.SelectedItems[0].Tag is User)
            {
                User selecteduser = session.Get<User>((listViewUsers.SelectedItems[0].Tag as User).Id);
			    session.Delete(selecteduser);
                session.Flush();
                listOfUsers.RemoveAt(listViewUsers.SelectedIndices[0]);
                ListUsers();
            }
        }

        private void copyFromRemoteButton_Click(object sender, EventArgs e)
		{
			if (CurrentUser.RemoteUsersDB == null || string.IsNullOrEmpty(CurrentUser.RemoteUsersDB.ConnectionString) ||
				CurrentUser.LocalUsersDB == null || string.IsNullOrEmpty(CurrentUser.LocalUsersDB.ConnectionString))
			{
				MessageBox.Show(Strings.No_remote_database_of_users, Strings.Error, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
				return;
			}

			if (MessageBox.Show(Strings.Are_you_sure, Strings.Warning, MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation) != DialogResult.Yes)
			{
				return;
			}

            IList<User> remoteUsers;
            IList<Group> remoteGroups;
            ITransaction transaction = null;
            ISession remoteSession = null;
            ISession localSession = null;

            try
            {
                ///
                /// Create remote DB session and read remote users
                ///
                DB.DbType = CurrentUser.RemoteUsersDB.DbType;
                DB.ConnectionString = CurrentUser.RemoteUsersDB.ConnectionString;
                remoteSession = DB.CreateSession();
                remoteUsers = remoteSession.QueryOver<User>().List();
                remoteGroups = remoteSession.QueryOver<Group>().List();

                ///
                /// Prepare local DB session
                ///
                DB.DbType = CurrentUser.LocalUsersDB.DbType;
                DB.ConnectionString = CurrentUser.LocalUsersDB.ConnectionString;
                localSession = DB.CreateSession();
                transaction = localSession.BeginTransaction();

                ///
                /// Delete all local users
                ///
                IList<User> users = localSession.QueryOver<User>().List();
                foreach (var user in users) localSession.Delete(user);
                IList<Group> groups = localSession.QueryOver<Group>().List();
                foreach (var group in groups) localSession.Delete(group);

                ///
                /// Save all remote users to the local DB
                ///
                IList<User> newUsers = new List<User>();
                IList<Group> newGroups = new List<Group>();
                foreach (var user in remoteUsers)
                {
                    User newUser = (User)user.Clone();
                    newUsers.Add(newUser);
                    foreach (var group in user.Groups)
                    {
                        Group newGroup = new Group(group.GID);
                        newUser.AddGroup(newGroup);
                    }

                    localSession.SaveOrUpdate(newUser);
                }
                transaction.Commit();
                localSession.Flush();
                localSession.Close();
                remoteSession.Close();

                listOfUsers = newUsers;
                ListUsers();

                MessageBox.Show(string.Format(Strings.N_users_copied, remoteUsers.Count),
                                Strings.Confirmation,
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Information);
            }
            catch (Exception)
            {
                if (transaction != null) transaction.Rollback();

                if (localSession != null && localSession.IsOpen) localSession.Close();
                if (remoteSession != null && remoteSession.IsOpen) remoteSession.Close();

                MessageBox.Show(Strings.Copying_remote_users_failed,
                                Strings.Confirmation,
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Information);
            }
        }
    }
}