using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Configuration;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Linq;
using Eugen.ESystem.IO;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.Window;
using static Eugen.ESystem.IO.LoadXMLFile;
using AppRes = Eugen.ESystem.Properties.AppResources;

namespace Eugen.ESystem
{
    public class DynamicMenuItems
    {
        #region Version und Copyright
        // Version und Copyright
        static string dllName = Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase); //Den Programmnamen auslesen
        static string dllVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString();
        static object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false);
        static string copyright = GenerateCopyright();

        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        static string date = value.ToShortDateString();
        static string time = value.ToLongTimeString();

        private static DateTime AssemblyDateTime()
        {
            var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            var buildDateTime = new DateTime(2000, 1, 1).Add(new TimeSpan(TimeSpan.TicksPerDay * version.Build + TimeSpan.TicksPerSecond * 2 * version.Revision));
            //Tage seit dem 1. Januar 2000 und Sekunden seit Mitternacht, (multiplizier mit 2 ergibt das Original)
            return buildDateTime;
        }

        private static string CurrentYear()
        {
            DateTime dtn = DateTime.Now;
            return dtn.Year.ToString();
        }

        private static string StartYear()
        {
            string startYear = "";
            if (((AssemblyCopyrightAttribute)attributes[0]).Copyright.Contains("Copyright © "))
            {
                startYear = ((AssemblyCopyrightAttribute)attributes[0]).Copyright.Replace("Copyright © ", "");
                while (startYear.StartsWith(" "))
                {
                    startYear = startYear.Remove(0, 1);
                }

                if (startYear.Contains("-"))
                {
                    startYear = startYear.Remove(startYear.IndexOf("-"));
                }
                else
                {
                    startYear = startYear.Remove(startYear.IndexOf(" "));
                }
                return startYear;
            }
            else
            {
                DateTime dtn = DateTime.Now;
                return dtn.Year.ToString();
            }
        }

        private static string GenerateCopyright()
        {
            string startYear = StartYear();
            string currentYear = CurrentYear();

            if (startYear == currentYear)
            {
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
            }
            else
            {
                string temp = ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
                string start = temp.Remove(temp.IndexOf(startYear) - 1);
                string end = (temp.Remove(0, temp.IndexOf(" by")));

                return String.Concat(start, " ", startYear, "-", currentYear, end);
            }
        }
        #endregion

        #region DLL-Info
        /// <summary>
        /// Contains the name of the dll file.
        /// </summary>
        public static string DllName { private set; get; }

        /// <summary>
        /// Contains the version of the dll file.
        /// </summary>
        public static string DllVersion { private set; get; }

        /// <summary>
        /// Contains the copyright notice.
        /// </summary>
        public static string Copyright { private set; get; }

        /// <summary>
        /// Contains the name-, version- and copyright-information of the dll file.
        /// </summary>
        public static string[] DllInfo { private set; get; }

        private static void SetDllInfo()
        {
            //Name, Version und Copyright setzen
            DllName = dllName;
            DllVersion = dllVersion;
            Copyright = copyright;

            string[] dllInfo = new string[3];
            dllInfo[0] = dllName;
            dllInfo[1] = dllVersion;
            dllInfo[2] = copyright;
            DllInfo = dllInfo;
        }

        protected string ProgramName { private set; get; }
        protected string ProgramVersion { private set; get; }
        protected string ProgramCopyright { private set; get; }
        #endregion

        static DynamicMenuItems()
        {
            SetDllInfo();
        }

        public DynamicMenuItems()
        {
            SetDllInfo();
        }

        /// <summary>
        /// Log file name
        /// </summary>
        public static string LogFile { get; set; }

        /// <summary>
        /// Name of the roaming file
        /// </summary>
        public static string FileNameRoaming { get; set; }

        /// <summary>
        /// Password for encryption
        /// </summary>
        public string Password { get; set; }

        /// <summary>
        /// File name of the configuration
        /// </summary>
        public string XmlFile { get; set; }

        /// <summary>
        /// The XML topic
        /// </summary>
        public string Topic { get; set; }

        /// <summary>
        /// The XML group
        /// </summary>
        public string Group { get; set; }

        /// <summary>
        /// The XML key
        /// </summary>
        public string Key { get; set; }

        /// <summary>
        /// The values stored in the XML file
        /// </summary>
        public string[,] Values { get; set; }

        /// <summary>
        /// List of menu entries to be created
        /// </summary>
        public string[] MenuItems { get; set; }

        /// <summary>
        /// The selected menu item
        /// </summary>
        public string Standard { get; set; }

        /// <summary>
        /// Menu into which the submenus are inserted
        /// </summary>
        public ToolStripMenuItem Menu { get; set; }

        /// <summary>
        /// The backcolor of a menu entry
        /// </summary>
        public Color BackColor { get; set; }

        /// <summary>
        /// The forcolor of a menu entry
        /// </summary>
        public Color ForeColor { get; set; }

        //Logfile global setzen
        LogWriter log = new LogWriter(Path.GetDirectoryName(LogFile), Path.GetFileName(LogFile));

        /// <summary>
        /// Insert a menu item
        /// </summary>
        /// <param name="menuItem">Name of the Menu item</param>
        public void AddMenuItem(string menuItem)
        {
            ToolStripMenuItem menu = (ToolStripMenuItem)(Menu);
            Menu.DropDownItems.Add(menuItem, null, new EventHandler(ToolStripMenuItem_Click));

            //Wenn BackColor und ForeColor einen Wert enthalten, dann das Menü einfärben
            if (BackColor != null & ForeColor != null)
            {
                foreach (ToolStripMenuItem item in menu.DropDownItems)
                {
                    item.BackColor = BackColor;
                    item.ForeColor = ForeColor;
                }
            }
            
            if (File.Exists(LogFile))
            {
                log.WriteMessage("License value menu entry \'" + menuItem + "\' generated", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }
        }

        /// <summary>
        /// Insert menu entry from a list that is in an XML file
        /// </summary>
        public void AddMenuItemsFromXML()
        {
            if (File.Exists(LogFile))
            {
                log.WriteMessage("Creating dynamic license bundles menu entries ...", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }

            LoadXmlFile(XmlFile, Topic, Group, Key); //Information aus der XML-Datei auslesen
            ExtractMenuItem(); //Die Menueinträge aus den XML-Daten ermitteln
            ExtractStandardItem(); //Das Standard Item ermitteln

            AddMenuItems(MenuItems); //Item zum Menü hinzufügen
            CheckMenuItem(Standard); //Standard Menü Item auswählen

            if (File.Exists(LogFile))
            {
                log.WriteMessage("Dynamic license bundles menu entries created successfully", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }
        }

        /// <summary>
        /// Insert menu entry from a list
        /// </summary>
        /// <param name="menuList">List of menu items</param>
        public void AddMenuItems(string[] menuList)
        {
            //Menueinträge erzeugen
            if (File.Exists(LogFile))
            {
                log.WriteMessage("Generating menu entries ...", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }

            //Zuerst alle angelegten Menüeinträge löschen
            RemoveAllMenuItems();

            //Für jedes Element in der Liste einen Menüpunkt anlegen
            foreach (var element in menuList)
            {
                AddMenuItem(element);
            }

            if (File.Exists(LogFile))
            {
                log.WriteMessage("All menu entries are generated successfully", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }
        }

        /// <summary>
        /// Check a menu item
        /// </summary>
        /// <param name="selectedItem">Item name</param>
        public void CheckMenuItem(string selectedItem)
        {
            //Hier soll der Menüeintrag, der dem Übergebenen Wert entspricht, auf 'Checked = true' gesetzt werden
            foreach (ToolStripMenuItem item in Menu.DropDownItems)
            {
                if (item.Text == selectedItem)
                {
                    item.Checked = true;
                    if (File.Exists(LogFile))
                    {
                        log.WriteMessage("The menu item \'" + item.Text + "\' was selected", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
                    } 
                }
                else
                {
                    item.Checked = false;
                }
            }
        }

        /// <summary>
        /// Removes a menu item
        /// </summary>
        /// <param name="item">Item name</param>
        public void RemoveMenuItem(string item)
        {
            ToolStripMenuItem menu = (ToolStripMenuItem)(Menu);

            foreach (ToolStripMenuItem xitem in menu.DropDownItems)
            {
                if (xitem.ToString() == item)
                {
                    menu.DropDownItems.Remove(xitem); //Den Menüeinträge löschen

                    if (File.Exists(LogFile))
                    {
                        log.WriteMessage("Remove menu entrie" + item, LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
                    }
                    return;
                }
            }
        }

        /// <summary>
        /// Removes the menu items specified in a list
        /// </summary>
        /// <param name="itemList">Item list</param>
        public void RemoveMenuItems(string[] itemList)
        {
            foreach (string item in itemList)
            {
                RemoveMenuItem(item);
            }
        }

        /// <summary>
        /// Removes all menu items
        /// </summary>
        public void RemoveAllMenuItems()
        {
            ToolStripMenuItem menu = (ToolStripMenuItem)(Menu);

            menu.DropDownItems.Clear(); //Alle angelegten Menüeinträge löschen

            if (File.Exists(LogFile))
            {
                log.WriteMessage("Removed all menu entries", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }
        }

        /// <summary>
        /// Saves a license value to the roaming area
        /// </summary>
        /// <param name="value">A valid string</param>
        /// <exception cref="UnableToSaveLicenseBundleException">Unable to save license value</exception>
        public void SaveValueToRoaming(string value, string key)
        {
            string password = Environment.GetEnvironmentVariable("USERNAME");
            var cryption = new Cryption();

            try
            {
                var roaming = new Roaming();
                roaming.MainKey = "NX-Portal";
                roaming.Key = key;
                roaming.Value = cryption.EncryptString(value, password);
                roaming.WriteKey();
            }
            catch (Exception)
            {
                throw new UnableToSaveLicenseBundleException();
            }
        }

        private void ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ToolStripMenuItem MenuItem = (ToolStripMenuItem)sender;

            //SelectedItem = MenuItem.Text;
            Standard = MenuItem.Text;

            CheckMenuItem(MenuItem.Text);

            //License Bundle ins Roaming schreiben
            if (!String.IsNullOrEmpty(FileNameRoaming))
            {
                SaveValueToRoaming(MenuItem.Text, FileNameRoaming); //In Roaming speichern
                log.WriteMessage("The license value was saved to roaming", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }
        }

        private void LoadXmlFile(string xmlFileName, string topic, string group, string key)
        {
            if (File.Exists(LogFile))
            {
                log.WriteMessage("Load menu items from XML-file", LogWriter.LogLevel.Information, LogWriter.Time.Write); //Logdatei schreiben
            }

            var loadXmlFile = new LoadXMLFile();
            //LoadXML.Password = password;
            loadXmlFile.FileName = xmlFileName;
            loadXmlFile.Topic = topic;
            loadXmlFile.Group = group;
            loadXmlFile.Key = key;
            loadXmlFile.LoadAllValues = LoadAll.Yes;

            //XML laden
            if (File.Exists(xmlFileName))
            {
                loadXmlFile.Load();

                Values = loadXmlFile.Values;
            }
            else
            {
                //Datei nicht gefunden
                MessageBox.Show(AppRes.msg001, AppRes.capt001, MessageBoxButtons.OK);
            }
        }

        private void ExtractMenuItem()
        {
            string[] menuItems = new string[Values.Length / 5];

            for (int i = 0; i < Values.Length / 5; i++)
            {
                menuItems[i] = Values[i, 3].ToString();
            }

            MenuItems = menuItems;
        }

        private void ExtractStandardItem()
        {
            for (int i = 0; i < Values.Length / 5; i++)
            {
                if (Values[i, 4].ToString() == "yes")
                {
                    Standard = Values[i, 3].ToString();
                }
            }
        }
    }

    #region Exceptions
    class UnableToSaveLicenseBundleException : ApplicationException
    {
        public UnableToSaveLicenseBundleException()
        { }

        public UnableToSaveLicenseBundleException(string message) : base(message)
        { }

        public UnableToSaveLicenseBundleException(string message, Exception inner) : base(message, inner)
        { }
    }
    #endregion
}