using System;
using System.Collections.Generic;
using System.Windows.Forms;
using log4net;
using NHibernate;
using Common;
using SharedDatabase;
using SharedDatabase.Entities;
using WorkflowConfigurator.Resources;

namespace WorkflowConfigurator
{
    public partial class MainWnd : Form
    {
        static readonly ILog log = LogManager.GetLogger(typeof(MainWnd));

        public MainWnd()
        {
            InitializeComponent();

            ///
            /// Loads processes from the database.
            /// In case of problems (missing database) makes it possible to create a new one.
            ///
            DialogResult settingsDR = DialogResult.OK;
            do
            {
                if (settingsDR == DialogResult.OK)
                {
                    try
                    {
                        TracingDB.Session = TracingDB.CreateSession(Program.LocalSettings.ConnectionString);
                        IList<WorkplaceRegistration> wPlaceRegistations = TracingDB.Session.QueryOver<WorkplaceRegistration>().List();   /// Try DB connection
                    }
                    catch (Exception exc)
                    {
                        log.FatalFormat("{0}:{1}{2}", Strings.Opening_database_failed, Environment.NewLine, exc.Message);

                        DialogResult rslt = MessageBox.Show(string.Format("{0}:{1}{2}{3}{1}{4}",
                                                                          Strings.Opening_database_failed,
                                                                          Environment.NewLine,
                                                                          exc.Message,
                                                                          exc.InnerException != null ? Environment.NewLine + exc.InnerException.Message : string.Empty,
                                                                          Strings.Do_you_want_to_change_settingsQM),
                                                            Strings.Error,
                                                            MessageBoxButtons.YesNo,
                                                            MessageBoxIcon.Exclamation);
                        if (rslt != DialogResult.Yes)
                        {
                            /// Settings ware not changed -> exit
                            throw new QuitAppException(Strings.Opening_database_failed);
                        }

                        settingsDR = new Forms.SettingsDlg().ShowDialog();
                    }
                }
            }
            while (settingsDR != DialogResult.Cancel && (TracingDB.Session == null));

            if (settingsDR == DialogResult.Cancel)
            {
                /// Settings were not changed -> exit
                throw new QuitAppException(Strings.Opening_database_failed);
            }

            if (!string.IsNullOrEmpty(Program.LocalSettings.UsersDBConnString))
            {
                CurrentUser.LocalUsersDB = new DBSettings(Common.DBType.MySql, Program.LocalSettings.UsersDBConnString);
            }
        }

        private void MainWnd_Load(object sender, EventArgs e)
        {
            PrintTitle(false);

            Controls.Add(new UserControls.OverviewOfProcessesCtrl(this));

            Settings2UI();
        }

        private void MainWnd_FormClosing(object sender, FormClosingEventArgs e)
        {
            e.Cancel = false;
            UI2Settings();
            Program.LocalSettings.Save();
        }

        #region Helper functions

        public static void PrintTitle(bool busy)
        {
            string user = CurrentUser.UserName();
            if (!string.IsNullOrEmpty(user)) user = string.Format(" ({0})", user);

            Program.MainWnd.Text = string.Format(busy ? "{0} v.{1}{2} ... reading database" : "{0} v.{1}{2}",
                                                 Strings.Workflow_configurator, Program.Version, user);
        }

        /// <summary>
        /// Set UI properties (determining the window position, etc) to values obtained from local settings
        /// </summary>
        void Settings2UI()
        {
            LocalSettings ls = Program.LocalSettings;
            ///
            WindowState = (ls.MWndMaximized ? FormWindowState.Maximized : FormWindowState.Normal);
            Width = ls.MWndWidth;
            Height = ls.MWndHeight;
            Left = ls.MWndLeft;
            Top = ls.MWndTop;
        }


        /// <summary>
        /// Retrieve UI properties and save them to local settings
        /// </summary>
        void UI2Settings()
        {
            LocalSettings ls = Program.LocalSettings;
            ///
            ls.MWndMaximized = (WindowState == FormWindowState.Maximized);
            if (WindowState == FormWindowState.Normal)
            {
                ls.MWndLeft = Location.X;
                ls.MWndTop = Location.Y;
                ls.MWndWidth = Size.Width;
                ls.MWndHeight = Size.Height;            }
            else
            {
                /// Maximized or minimized (when restarted, minimized window is restored as normal)
                ls.MWndLeft = RestoreBounds.Left;
                ls.MWndTop = RestoreBounds.Top;
                ls.MWndWidth = RestoreBounds.Width;
                ls.MWndHeight = RestoreBounds.Height;
            }
        }

        #endregion
    }
}