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using System;
using System.IO;
using System.Linq;
using XenAdmin.Core;
using XenAdmin.Network;
using XenCenterLib;

namespace XenAdmin.Dialogs
{
    public partial class AddServerDialog : XenDialogBase
    {
        private readonly bool _changedPass;

        public event Action<IXenConnection> CachePopulated;

        /// <summary>
        /// Dialog with defaults taken from an existing IXenConnection
        /// </summary>
        /// <param name="connection">The IXenConnection from which the values will be taken.  May be null, in which case an appropriate new
        /// connection will be created when the dialog is completed.</param>
        /// <param name="changedPass"></param>
        public AddServerDialog(IXenConnection connection, bool changedPass)
            : base(connection)
        {
            _changedPass = changedPass;

            InitializeComponent();

            var history = Settings.GetServerHistory().ToArray();
            Array.Sort(history, StringUtility.NaturalCompare);
            ServerNameComboBox.Items.AddRange(history.Where(s => s != null).Cast<object>().ToArray());

            if (connection != null)
            {
                ServerNameComboBox.Text = connection.HostnameWithPort;
                UsernameTextBox.Text = connection.Username;
                PasswordTextBox.Text = connection.Password ?? "";
            }
        }

        private void OnCachePopulated(IXenConnection conn)
        {
            var handler = CachePopulated;
            if (handler != null)
                handler(conn);
        }

        private void AddServerDialog_Load(object sender, EventArgs e)
        {
            UpdateText();
            CenterToParent();
        }

        private void AddServerDialog_Shown(object sender, EventArgs e)
        {
            //Set focus to the password field if there's a connection and a username.
            //CA-68596: Focus has to be set when the dialog is shown rather than loaded
            //(which happens before it's shown), so a warning can pop up if CapsLock is on

            if (!ServerNameComboBox.Enabled && connection != null && !string.IsNullOrEmpty(connection.Username))
            {
                Win32.SetFocus(PasswordTextBox.Handle);
            }
        }

        private void UpdateText()
        {
            if (connection == null)
            {
                Text = Messages.ADD_NEW_CONNECT_TO;
                labelInstructions.Text = Messages.ADD_NEW_ENTER_CREDENTIALS;
                labelError.Text = "";
                ServerNameComboBox.Enabled = true;
                AddButton.Text = Messages.ADD;
            }
            else if (!_changedPass)
                return;
            else if (connection.Password == null)
            {
                Text = Messages.CONNECT_TO_SERVER;
                labelInstructions.Text = Messages.CONNECT_TO_SERVER_BLURB;
                labelError.Text = "";
                ServerNameComboBox.Enabled = false;
                AddButton.Text = Messages.CONNECT;
            }
            else if (connection.ExpectPasswordIsCorrect)
            {
                // This situation should be rare, it normally comes from logging in a new session after an existing one has been made
                // We now use duplicate sessions instead most of the time which don't log in again.
                Text = Messages.CONNECT_TO_SERVER;
                labelInstructions.Text = string.Format(Messages.ADDSERVER_PASS_NEW, BrandManager.BrandConsole);
                labelError.Text = "";
                ServerNameComboBox.Enabled = false;
                AddButton.Text = Messages.OK;
            }
            else  // the password probably hasn't actually changed but we do know the user has typed it in wrong
            {
                Text = Messages.CONNECT_TO_SERVER;
                labelInstructions.Text = string.Format(Messages.ERROR_CONNECTING_BLURB, BrandManager.BrandConsole);
                labelError.Text = Messages.ADD_NEW_INCORRECT;
                ServerNameComboBox.Enabled = false;
                AddButton.Text = Messages.CONNECT;
            }

        }

        private void AddButton_Click(object sender, EventArgs e)
        {
            string serverInput = ServerNameComboBox.Text.Trim();
            string username = UsernameTextBox.Text.Trim();
            string password = PasswordTextBox.Text;

            var servers = serverInput.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);

            IXenConnection conn = null;
            if (servers.Length == 1)
                conn = connection;

            foreach (var server in servers)
                ConnectToServer(conn, server, username, password);

            Close();
        }

        private void ConnectToServer(IXenConnection conn, string server, string username, string password)
        {
            if (conn == null)
            {
                conn = new XenConnection { fromDialog = true };
                conn.CachePopulated += conn_CachePopulated;
            }
            else if (!_changedPass)
            {
                conn.EndConnect(); // in case we're already connected
            }

            conn.Username = username;
            conn.Password = password;
            conn.ExpectPasswordIsCorrect = false;

            if (File.Exists(server))
            {
                conn.Hostname = server;
                conn.Port = ConnectionsManager.DEFAULT_XEN_PORT;
                XenConnectionUI.ConnectToXapiDatabase(conn, this);
            }
            else if (!_changedPass)
            {
                StringUtility.ParseHostnamePort(server, out var hostname, out var port);

                if (port == 0)
                    port = ConnectionsManager.DEFAULT_XEN_PORT;
                
                conn.Hostname = hostname;
                conn.Port = port;
                XenConnectionUI.BeginConnect(conn, true, Owner, false);
            }
        }

        private void conn_CachePopulated(IXenConnection conn)
        {
            conn.CachePopulated -= conn_CachePopulated;
            OnCachePopulated(conn);
        }

        private void CancelButton2_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void TextFields_TextChanged(object sender, EventArgs e)
        {
            UpdateButtons();
        }

        private void UpdateButtons()
        {
            AddButton.Enabled = OKButtonEnabled();
        }

        private bool OKButtonEnabled()
        {
            return ServerNameComboBox.Text.Trim().Length > 0 && UsernameTextBox.Text.Trim().Length > 0;
        }

        private void labelError_TextChanged(object sender, EventArgs e)
        {
            pictureBoxError.Visible = labelError.Visible = (labelError.Text != "");
        }
    }
}