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using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAdmin.TestResources;

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

        public event EventHandler<CachePopulatedEventArgs> 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>
        public AddServerDialog(IXenConnection connection, bool changedPass)
            : base(connection)
        {
            _changedPass = changedPass;

            InitializeComponent();

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

            // we have an inner table layout panel due to the group box. Align the columns by examining lables sizes
            Label[] labels = { UsernameLabel, PasswordLabel, ServerNameLabel };
            int biggest = 0;
            foreach (Label l in labels)
            {
                if (l.Width > biggest)
                    biggest = l.Width;
            }
            // set the minimum size of one label from each table which will make sure the columns line up
            UsernameLabel.MinimumSize = new Size(biggest, UsernameLabel.Height);
            ServerNameLabel.MinimumSize = new Size(biggest, ServerNameLabel.Height);

        }
        protected void PopulateXenServerHosts()
        {
            AutoCompleteStringCollection history = Settings.GetServerHistory();

            string[] historyArray = new string[history.Count];
            history.CopyTo(historyArray, 0);
            Array.Sort(historyArray, StringUtility.NaturalCompare);
            foreach (string serverName in historyArray)
            {
                if (serverName != null)
                    ServerNameComboBox.Items.Add(serverName);
            }

            // Use a clone as the auto-complete source because of CA-38715
            AutoCompleteStringCollection historyClone = new AutoCompleteStringCollection();
            historyClone.AddRange(historyArray);
            ServerNameComboBox.AutoCompleteCustomSource = historyClone;
        }

        protected virtual void OnCachePopulated(CachePopulatedEventArgs e)
        {
            EventHandler<CachePopulatedEventArgs> handler = CachePopulated;

            if (handler != null)
            {
                handler(this, e);
            }
        }

        protected 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);
            }
        }

        protected 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;
            }
            if (_changedPass && 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 (_changedPass && 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 = Messages.ADDSERVER_PASS_NEW;
                labelError.Text = "";
                ServerNameComboBox.Enabled = false;
                AddButton.Text = Messages.OK;
            }
            else if (_changedPass) // the password probably hasnt actually changed but we do know the user has typed it in wrong
            {
                Text = Messages.CONNECT_TO_SERVER;
                labelInstructions.Text = Messages.ERROR_CONNECTING_BLURB;
                labelError.Text = Messages.ADD_NEW_INCORRECT;
                ServerNameComboBox.Enabled = false;
                AddButton.Text = Messages.CONNECT;
            }
        }

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

            string[] multipleHosts;

            if (TryGetMultipleHosts(hostnameAndPort, out multipleHosts))
            {
                foreach (string h in multipleHosts)
                {
                    ConnectToServer(null, h, ConnectionsManager.DEFAULT_XEN_PORT, username, password, comboBoxClouds.SelectedItem != null ? comboBoxClouds.SelectedItem.ToString() : string.Empty);
                }
            }
            else
            {
                string hostname;
                int port;

                if (!StringUtility.TryParseHostname(hostnameAndPort, ConnectionsManager.DEFAULT_XEN_PORT, out hostname, out port))
                {
                    hostname = hostnameAndPort;
                    port = ConnectionsManager.DEFAULT_XEN_PORT;
                }
                ConnectToServer(connection, hostname, port, username, password, comboBoxClouds.SelectedItem != null ? comboBoxClouds.SelectedItem.ToString() : string.Empty);
            }

            Close();
        }

        /// <param name="connection">May be null, in which case a new connection will be created</param>
        protected void ConnectToServer(IXenConnection conn, string hostname, int port, string username, string password, string version)
        {
            if (conn == null)
            {
                XenConnection connection = new XenConnection();
                connection.CachePopulated += conn_CachePopulated;
                connection.fromDialog = true;
                conn = connection;
            }
            else if (!_changedPass)
            {
                conn.EndConnect(); // in case we're already connected
            }

            conn.Hostname = hostname;
            conn.Port = port;
            conn.Username = username;
            conn.Password = password;
            conn.ExpectPasswordIsCorrect = false;
            conn.Version = version;

            if (!_changedPass)
                XenConnectionUI.BeginConnect(conn, true, Owner, false);
        }

        private void conn_CachePopulated(object sender, EventArgs e)
        {
            IXenConnection connection = (IXenConnection)sender;
            connection.CachePopulated -= conn_CachePopulated;
            OnCachePopulated(new CachePopulatedEventArgs(connection));
        }

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

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

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

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

        private void CancelButton2_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control || e.Alt)
            {
                switch (e.KeyCode)
                {
                    case Keys.D1:
                        Launch(TestResource.Resource.InterestingProduction);
                        break;
                    case Keys.D2:
                        Launch(TestResource.Resource.InterestingDevelopment);
                        break;
                    case Keys.D3:
                        Launch(TestResource.Resource.InterestingXenApp);
                        break;
                    case Keys.D4:
                        Launch(TestResource.Resource.Credits);
                        break;
                    default:
                        break;
                }
            }
        }

        private void Launch(TestResource.Resource r)
        {
            ServerNameComboBox.Text = TestResource.Location(r);
            AddButton_Click(this, null);
        }

        /// <summary>
        /// Used for testing. Parses text for a semi-colon separated list of files that are loaded by DbProxy.
        /// </summary>
        /// <param name="text">The text to be parsed</param>
        /// <param name="hosts">The parse results</param>
        /// <returns>A value indicating whether the operation succeeded.</returns>
        private static bool TryGetMultipleHosts(string text, out string[] hosts)
        {
            hosts = new string[0];
            string[] splitStr = text.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
            if (splitStr.Length > 0)
            {
                List<string> hostList = new List<string>();
                foreach (string element in splitStr)
                {
                    string host = element.Trim();
                    if (string.IsNullOrEmpty(host))
                        // ignore "empty" entry
                        continue;

                    if (Regex.IsMatch(host, @"^[A-Za-z]\:\\") && File.Exists(host))
                    {
                        // is a file
                        hostList.Add(host);
                        continue;
                    }
                    if (Regex.IsMatch(host, @"^http\:|^[A-Za-z]\:"))
                    {
                        Uri uri;
                        if (Uri.TryCreate(host, UriKind.Absolute, out uri))
                        {
                            hostList.Add(host);
                            continue;
                        }
                    }
                    else
                    {
                        // some sort of ip address or hostname, just add
                        hostList.Add(host);
                    }
                }

                if (hostList.Count < 2)
                {
                    return false;
                }

                hosts = hostList.ToArray();
                return true;
            }

            return false;
        }

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

        private void AddServerDialog_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (connection != null)
                XenConnectionUI.connectionDialogs.Remove(connection);
        }
    }

    public class CachePopulatedEventArgs : EventArgs
    {
        private readonly IXenConnection _connection;

        public CachePopulatedEventArgs(IXenConnection connection)
        {
            Util.ThrowIfParameterNull(connection, "connection");
            _connection = connection;
        }

        public IXenConnection Connection
        {
            get
            {
                return _connection;
            }
        }
    }
}