using System;
using System.IO;
using System.Collections.Generic;
using System.Windows.Forms;
using log4net;
using TBF.Resources;
using TBF.Forms;
using TBF.ErrorHandler;

using NHibernate;

namespace TBF
{
    public class Program
    {
		public const string AdminUsername = "admin";
		public const string AdminPassword = "staratura";

		public const string HomeDir = "C:\\Tbf\\";		/// Contains subdirectories Results, Logs, Images, ...

		/// log4net
		static readonly ILog log = LogManager.GetLogger(typeof(Program));
		const string log4netConfigFName = "log4netConfig.xml";

		/// Local settings
		public static LocalSettings LocalSettings = new LocalSettings();
		public const string LocalSettingsFileName = "config.xml";

		/// Database related: This object reference is set after a successful user login
		public static DatabaseSettings CurrentBench;
		const string SQLiteDbFName = "SQLite.db";
		
#if (DN100 || MUNICH)
		public const int WMsCount = 3;
#elif FUZHOU300
        public const int WMsCount = 5;
#else // if FUZHOU150
		public const int WMsCount = 6;
#endif

        /// <summary>
        /// Selected procedure data
        ///  - before the main program window is open, objects referenced by this variable
        ///    are loaded from the database.
        ///  - user interface displays data stored in objects referenced by this variable.
        ///    When user modifies procedure settings and confirms changes (choses to save them),
        ///    data referenced by this variable are updated and written to the database.
        ///  - when users starts a test procedure, state machine creates its own copy
        ///    of procedure data and uses them for the test. Changes of 'SelectedProcedure'
        ///    done during the test do not have any influence on the currently running test.
        /// </summary>
        public static Entities.Procedure SelectedProcedure = null;

        /// <summary>
        /// Main window object.
        /// </summary>
        public static MainWnd MainWnd;


        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
			/// Local program configuration directory including the trailing backslash
			string locAppDataDir = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) +
								   Path.DirectorySeparatorChar + "TestBenchFramework" + Path.DirectorySeparatorChar;

            /// Check whether local application data directory exists.
			/// If not, create it and copy the initial configuration to this directory.
			/// This is done only once after a clean program installation on the first program start-up
			try
            {
				if (!Directory.Exists(locAppDataDir))
				{
					Directory.CreateDirectory(locAppDataDir);
					Environment.CurrentDirectory = locAppDataDir;

					string sampleConfig = Application.StartupPath + Path.DirectorySeparatorChar + "SampleConfig" + Path.DirectorySeparatorChar;
					if (File.Exists(sampleConfig + LocalSettingsFileName)) { File.Copy(sampleConfig + LocalSettingsFileName, LocalSettingsFileName); }
					if (File.Exists(sampleConfig + log4netConfigFName)) { File.Copy(sampleConfig + log4netConfigFName, log4netConfigFName); }
					if (File.Exists(sampleConfig + SQLiteDbFName)) { File.Copy(sampleConfig + SQLiteDbFName, SQLiteDbFName); }

					File.SetAttributes(LocalSettingsFileName, FileAttributes.Normal);
					File.SetAttributes(log4netConfigFName, FileAttributes.Normal);
					File.SetAttributes(SQLiteDbFName, FileAttributes.Normal);
				}
				else
				{
					Environment.CurrentDirectory = locAppDataDir;
				}
			}
            catch (Exception e)
            {
                log.Error("A problem when creating the local application data directory and preparing the initial configuration", e);
				return;
            }

			/// Configue and start logging
			log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(locAppDataDir + log4netConfigFName));
			log.Info("Entering application.");

            /// Load the local settings
            if (Program.LocalSettings == null) return;       /// Fatal error
            LocalSettings.Load();

            System.Threading.Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(LocalSettings.Language);

            /// This belongs to Application.Run(new MainWnd()) ...
            /// and should be executed before opening 'loginDlg'
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

			/// Ensure that there is at least one bench in the configuration
			while (Program.LocalSettings.testBenches.GetLength(0) == 0)
			{
				log.Warn("No test benches in the local configuration -> display an appropriate dialog.");

				/// Ask what to do, ask for the password, open 'DatabaseSetingsDlg' and continue on OK
				if (new Forms.NoBenchOrDatabaseDlg { Message = Strings.NoBenchMsg }.ShowDialog() != DialogResult.OK ||
					new Forms.EnterPasswordDlg { Password = AdminPassword }.ShowDialog() == DialogResult.Cancel ||
					new BenchesDlg().ShowDialog() == DialogResult.Cancel)
				{
					return;     /// Exit program
				}

				log.Warn("Loading the local settings again.");
				LocalSettings.Load();
			}

            /// User login
            bool retryLogin = true;         /// true = stay in a login loop
            do {
                LoginDlgWithBenchSelection loginDlgBenchSelection;
                if (LocalSettings.LastBenchName != null)
                {
                    loginDlgBenchSelection = new LoginDlgWithBenchSelection(LocalSettings.LastBenchName);
                }
                else
                {
                    loginDlgBenchSelection = new LoginDlgWithBenchSelection();
                }
                DialogResult dr = loginDlgBenchSelection.ShowDialog();

                if (dr == DialogResult.Cancel)
                {
                    return;         /// Login canceled --> Exit application
                }
                else
                {
                    for (int i = 0; i < LocalSettings.BenchesCount; i++)
                    {
                        if (LocalSettings.TestBenches[i].BenchName == loginDlgBenchSelection.BenchName)
                        {             
                            Entities.User loadedUser = null;
                            try
                            {
								bool authorized = false;

								/// Load user from the UsersAndGroupsDB database
                                loadedUser = Entities.User.LoadUserByName(loginDlgBenchSelection.User,
                                                                          LocalSettings.TestBenches[i].UsersDBSettings);
								if (loadedUser != null)
								{
                                    authorized = loadedUser.Authorize(loginDlgBenchSelection.User, loginDlgBenchSelection.Password);
								}

								if (authorized)
                                {
									log.InfoFormat("Password accepted, bench '{0}' parameters loaded.", LocalSettings.TestBenches[i].BenchName);

                                    /// Copy the selected bench settings to CurrentBench.
                                    /// Clone() guarantees that current bench settings wont be modified
                                    /// when user modifies the database settings in DatabaseSettingsDlg.
                                    CurrentBench = (DatabaseSettings)LocalSettings.TestBenches[i].Clone();

                                    /// Save the selection to local settings
                                    LocalSettings.LastBenchName = CurrentBench.BenchName;

                                    retryLogin = false;
                                    break;
                                }

                                if (retryLogin)
                                {
                                    /// Close Fluent NHibernate
                                    MessageBox.Show(Strings.Invalid_user_password_or_bench, Strings.Error, MessageBoxButtons.OK);
                                }
                            }
                            catch (Exception e)
                            {
                                /// Database connect failed, ask what to do
								switch ((new Forms.NoBenchOrDatabaseDlg { Message = Strings.NoDatabaseMsg, ShowRetry = true }).ShowDialog())
								{
									case DialogResult.Abort: return;    /// Exit program
									case DialogResult.Retry: break;     /// Retry the loop
									default:
										/// Open 'DatabaseSetingsDlg' and retry DB connect on OK
										if (new Forms.EnterPasswordDlg { Password = AdminPassword }
													 .ShowDialog() == DialogResult.Cancel ||
											new BenchesDlg().ShowDialog() == DialogResult.Cancel)
										{
											return;     /// Exit program
										}
										LocalSettings.Load();
										break;          /// Retry the loop
								}
							}
						} // if benchname is OK
                    } // for all benches in local settings loop
                } // not Canceled
            } //do
            while (retryLogin);

            ///
            /// Load the last procedure or create a new, default one
            /// 
            if (LocalSettings.LastProcedureName != null)
            {
                IList<Entities.Procedure> listOfProcedures = FluentCommon.CreateSession(Database.Procedures)
					.CreateQuery("FROM Procedure WHERE Name = :procName")
					.SetParameter("procName", LocalSettings.LastProcedureName)
					.List<Entities.Procedure>();

                if (listOfProcedures.Count == 1)
                {
					log.InfoFormat("Pre-selecting the procedure {0}", LocalSettings.LastProcedureName);
					SelectedProcedure = listOfProcedures[0];
                }
            }

            /// Open the main application window
			log.Info("Creating the main window");
			MainWnd = new MainWnd();
			log.Info("Opening the main window");
			Application.Run(MainWnd);

            /// Save local settings
			log.Info("The main window was closed, saving the local parameters");
			LocalSettings.Save();

            /// Close Fluent NHibernate
            /// Todo
			
			log.Info("Exiting application.");
        }
    }
}