using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Threading;
using System.Windows.Forms;
using log4net;
using Common;
using Common.Forms;
using SharedDatabase.Entities;
using WorkflowConfigurator.Resources;

namespace WorkflowConfigurator
{
    static class Program
    {
        /// Constants
        public static GID[] SettingsAccessLevel = new GID[] { GID.TraceabilityManagement };     /// Group membership to access settings
        public const string ConfigFName = "config.xml";
        public const string BackupConfigFName = "config.backup.xml";
        public const string Log4NetConfigFName = "log4netConfig.xml";

        /// Program information
        public static readonly string Version;			/// version string
        public static readonly DateTime BuildDateTime;	/// date and time of program build
        public static readonly string ExeDirectory;
        public static readonly string ConfigDirectory;
        public static readonly string LogDirectory;
        public static readonly string LocalSettingsFileName;
        public static readonly string LocalSettingsBackupName;

        public static MainWnd MainWnd;

        /// Local settings
        public static LocalSettings LocalSettings;

        static Program()
        {
            /// Program version string
            Assembly thisAssembly = Assembly.GetExecutingAssembly();
            Version ver = thisAssembly.GetName().Version;
            Version = string.Format("{0}.{1}.{2}", ver.Major, ver.Minor, ver.Build);
            BuildDateTime = new FileInfo(thisAssembly.Location).LastWriteTime;

            /// Local program configuration directory including the trailing backslash
            ExeDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            ConfigDirectory = Path.Combine(ExeDirectory, "..", "Cfg");
            LogDirectory = Path.Combine(ExeDirectory, "..", "Logs");
            LocalSettingsFileName = Path.Combine(ConfigDirectory, ConfigFName);
            LocalSettingsBackupName = Path.Combine(ConfigDirectory, BackupConfigFName);
        }

        
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            ///
            /// Load the local settings
            ///
            Program.LocalSettings = LocalSettings.Load(Program.LocalSettingsFileName);
            if (Program.LocalSettings == null)
            {
                /// Loading local seetings from regular config file failed. Use the backup
                Program.LocalSettings = LocalSettings.Load(Program.LocalSettingsBackupName);
                if (Program.LocalSettings == null)
                {
                    MessageBox.Show(string.Format("{0}{1}{2}", Strings.Program_is_running_for_the_1st_time_on_this_PC,
                                                               Environment.NewLine,
                                                               Strings.Default_settings_are_used),
                                    Strings.Warning,
                                    MessageBoxButtons.OK,
                                    MessageBoxIcon.Exclamation);
                    Program.LocalSettings = new LocalSettings(true);        /// Create new default local setting
                    Directory.CreateDirectory(ConfigDirectory);
                    Program.LocalSettings.Save();

                    if (File.Exists(Path.Combine(ExeDirectory, "SampleConfig", Log4NetConfigFName)))
                    {
                        File.Copy(Path.Combine(ExeDirectory, "SampleConfig", Log4NetConfigFName),
                                  Path.Combine(ConfigDirectory, Log4NetConfigFName));
                    }

                    File.SetAttributes(Path.Combine(ConfigDirectory, Log4NetConfigFName), FileAttributes.Normal);
                }
                else
                {
                    LocalSettings.Save();	/// Save the settings to overwrite the wrong file
                }
            }
            else
            {
                /// Loading local seetings from the regular config file was successful. Update the backup
                File.Copy(Program.LocalSettingsFileName, Program.LocalSettingsBackupName, true);
            }

            ///
            /// Configure and start logging
            ///
            log4net.Config.XmlConfigurator.Configure(new FileInfo(Path.Combine(ConfigDirectory, Log4NetConfigFName)));
            ILog log = LogManager.GetLogger(typeof(Program));
            log.Fatal("------------------------------------------------------------------------------------------------");
            log.FatalFormat("WorkfowConfigurator v.{0} started", Version);

            ///
            /// Set language
            ///
            try
            {
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(Program.LocalSettings.Language);
            }
            catch (Exception)
            {
                MessageBox.Show("Selected language is not supported.\nGoing to use English.",
                                "Warning",
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Asterisk);
                Thread.CurrentThread.CurrentUICulture = new CultureInfo("en");
            }

            ///
            /// Run the WinForm application
            /// 
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            try
            {
                MainWnd = new MainWnd();
                Application.Run(MainWnd);
            }
            catch (Exception exc)
            {
                if (exc is QuitAppException)
                {
                    //ModelessForm.CloseForm();
                    log.FatalFormat("Program was not running: {0}", exc.Message);
                    MessageBox.Show(exc.Message,
                                    Strings.Warning,
                                    MessageBoxButtons.OK,
                                    MessageBoxIcon.Exclamation);
                }
                else
                {
                    log.FatalFormat("Program crashed:{0}{1}Stack trace:{0}{2}", Environment.NewLine, exc.Message, exc.StackTrace);

                    MessageBox.Show("Program crashed:" +
                                    Environment.NewLine + Environment.NewLine + exc.Message +
                                    ((exc.InnerException == null) ? string.Empty : (Environment.NewLine + exc.InnerException.Message)) +
                                    Environment.NewLine + exc.StackTrace,
                                    Strings.Warning,
                                    MessageBoxButtons.OK,
                                    MessageBoxIcon.Exclamation);
                }
            }
        }
    }
}