using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Resources;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Eugen.ESystem.Windows.Forms
{
    /// <summary>
    /// Displays a Program Information Box
    /// </summary>
    public partial class AboutBox : Form
    {
        #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();
        string icon = Application.StartupPath + "\\Info.bmp";
        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        string date = value.ToShortDateString();
        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);
                }
                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
            {
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright.Replace(startYear, String.Concat(startYear, "-", currentYear));
            }
        }
        #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;
        }
        #endregion

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        static AboutBox()
        {
            SetDllInfo(); //Name, Version und Copyright der DLL setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        public AboutBox(string programName, string programVersion, string programCopyright)
        {
            InitializeComponent();

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        /// <param name="width">Window with: Min. 500, Max. 800.</param>
        /// <param name="hight">Window hight: Min. 400, Max. 600.</param>
        public AboutBox(string programName, string programVersion, string programCopyright, int width, int hight)
        {
            InitializeComponent();

            //Fenstergröße einstellen
            SetWindow(width, hight);

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        /// <param name="showDllInfoButton">true = Button is displayed; false = Button is not displayed.</param>
        public AboutBox(string programName, string programVersion, string programCopyright, bool showDllInfoButton)
        {
            InitializeComponent();

            if (showDllInfoButton)
            {
                buttonDllInfo.Enabled = true;
                buttonDllInfo.Visible = true;
            }
            else
            {
                buttonDllInfo.Enabled = false;
                buttonDllInfo.Visible = false;
            }

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        /// <param name="showDllInfoButton">true = Button is displayed; false = Button is not displayed.</param>
        /// <param name="width">Window with: Min. 500, Max. 800.</param>
        /// <param name="hight">Window hight: Min. 400, Max. 600.</param>
        public AboutBox(string programName, string programVersion, string programCopyright, bool showDllInfoButton, int width, int hight)
        {
            InitializeComponent();

            //Fenstergröße einstellen
            SetWindow(width, hight);

            if (showDllInfoButton)
            {
                buttonDllInfo.Enabled = true;
                buttonDllInfo.Visible = true;
            }
            else
            {
                buttonDllInfo.Enabled = false;
                buttonDllInfo.Visible = false;
            }

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        /// <param name="icon">A valid icon in the size 32x32 dots with path. Larger icons are cropped. E.g.: C\:MyFolder\MyIcon.ico</param>
        /// <param name="showDllInfoButton">true = Button is displayed; false = Button is not displayed.</param>
        public AboutBox(string programName, string programVersion, string programCopyright, Icon icon, bool showDllInfoButton)
        {
            InitializeComponent();

            pictureBox.Image = Bitmap.FromHicon(new Icon(icon, new Size(32, 32)).Handle);

            if (showDllInfoButton)
            {
                buttonDllInfo.Enabled = true;
                buttonDllInfo.Visible = true;
            }
            else
            {
                buttonDllInfo.Enabled = false;
                buttonDllInfo.Visible = false;
            }

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        /// <summary>
        /// Displays a Program Information Box
        /// </summary>
        /// <param name="programName">A valid Program name.</param>
        /// <param name="programVersion">A valid version number.</param>
        /// <param name="programCopyright">The copyrigth Information</param>
        /// <param name="icon">A valid icon in the size 32x32 dots with path. Larger icons are cropped. E.g.: C\:MyFolder\MyIcon.ico</param>
        /// <param name="showDllInfoButton">true = Button is displayed; false = Button is not displayed.</param>
        /// <param name="width">Window with: Min. 500, Max. 800.</param>
        /// <param name="hight">Window hight: Min. 400, Max. 600.</param>
        public AboutBox(string programName, string programVersion, string programCopyright, Icon icon, bool showDllInfoButton, int width, int hight)
        {
            InitializeComponent();

            //Fenstergröße einstellen
            SetWindow(width, hight);

            pictureBox.Image = Bitmap.FromHicon(new Icon(icon, new Size(32, 32)).Handle);

            if (showDllInfoButton)
            {
                buttonDllInfo.Enabled = true;
                buttonDllInfo.Visible = true;
            }
            else
            {
                buttonDllInfo.Enabled = false;
                buttonDllInfo.Visible = false;
            }

            SetContent(programName, programVersion, programCopyright); //Fensterinhalt setzen
        }

        private void AboutBox_Load(object sender, EventArgs e)
        {
            DllInfoSelected = false;

            Appearance();
        }

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

        protected bool DllInfoSelected { set; get; }
        protected bool ShowDllInfoButton { set; get; }

        private void buttonClose_Click(object sender, EventArgs e)
        {
            if (DllInfoSelected)
            {
                buttonDllInfo.Enabled = true;
                buttonDllInfo.Visible = true;
                radioButtonAll.Enabled = false;
                radioButtonAll.Visible = false;
                radioButtonInternal.Enabled = false;
                radioButtonInternal.Visible = false;

                textBox.WordWrap = true;
                textBox.ScrollBars = ScrollBars.Vertical;

                labelDisclaimer.Text = Language.disclaimerHeader001;
                textBox.Text = Language.disclaimer;
                DllInfoSelected = false;
            }
            else
            {
                this.Close(); //Das Fenster schliessen
            }
        }

        private void buttonDllInfo_Click(object sender, EventArgs e)
        {
            //DLL-Informationen anzeigen
            DllInfoSelected = true;
            buttonDllInfo.Enabled = false;
            buttonDllInfo.Visible = false;
            radioButtonAll.Enabled = true;
            radioButtonAll.Visible = true;
            radioButtonInternal.Enabled = true;
            radioButtonInternal.Visible = true;

            textBox.WordWrap = false;
            textBox.ScrollBars = ScrollBars.Both;

            labelDisclaimer.Text = Language.dllInfo001;
            textBox.Text = "";
            
            textBox.Text = CreateDllInfo();
        }

        private void radioButtonAll_CheckedChanged(object sender, EventArgs e)
        {
            textBox.Text = CreateDllInfo();
        }

        private void radioButtonInternal_CheckedChanged(object sender, EventArgs e)
        {
            textBox.Text = CreateDllInfo();
        }

        private void buttonExport_Click(object sender, EventArgs e)
        {
            //Speichert den Inhalt der TextBox oder den selektierten Bereich daraus
            saveFileDialog.Filter = Language.dialog001;
            saveFileDialog.ShowDialog();
        }

        private void saveFileDialog_FileOk(object sender, CancelEventArgs e)
        {
            string fileName = saveFileDialog.FileName;
            string text = ExportText();

            try
            {
                File.WriteAllText(fileName, text); //Schreibt den Text in eine Datei
            }
            catch (Exception)
            {
                MessageBox.Show(Language.message001,
                                Language.messageHead001,
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Error,
                                MessageBoxDefaultButton.Button1);
            }
        }

        private void SaveFileDialogFileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            string fileName = saveFileDialog.FileName;
            string text = ExportText();

            try
            {
                File.WriteAllText(fileName, text); //Schreibt den Text in eine Datei
            }
            catch (Exception)
            {

                MessageBox.Show(Language.message001,
                                Language.messageHead001,
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Error,
                                MessageBoxDefaultButton.Button1);
            }
        }

        private void SetContent(string programName, string programVersion, string programCopyright)
        {
            labelProgramName.Text = programName;
            ProgramName = programName;
            if (programVersion.StartsWith("V"))
            {
                labelVersion.Text = programVersion;
                ProgramVersion = programVersion;
            }
            else
            {
                labelVersion.Text = String.Concat("Version ", programVersion);
                ProgramVersion = labelVersion.Text;
            }
            labelCopyright.Text = programCopyright;
            ProgramCopyright = programCopyright;

            textBox.Text = Language.disclaimer;
        }

        private string ExportText()
        {
            if (DllInfoSelected)
            {
                DateTime today = DateTime.Now;

                if (radioButtonAll.Checked)
                {
                    return String.Concat(Language.dllInfo002, "\r\n", today.ToString("yyyy-MM-dd - HH:mm:ss"), "\r\n--------------------------------------------------------------------------------\r\n", FixLineLenght.Format(textBox.Text, 80)); //Gibt den ganzen Text zurück
                }
                else
                {
                    return String.Concat(Language.dllInfo001, "\r\n", today.ToString("yyyy-MM-dd - HH:mm:ss"), "\r\n--------------------------------------------------------------------------------\r\n", FixLineLenght.Format(textBox.Text, 80)); //Gibt den ganzen Text zurück
                }
                
            }
            else
            {
                if (textBox.SelectionLength > 0)
                {
                    return textBox.SelectedText; //Gibt den selektierten Text zurück
                }
                else
                {
                    return String.Concat(ProgramName, "\r\n", ProgramVersion, "\r\n", ProgramCopyright, "\r\n--------------------------------------------------------------------------------\r\n", FixLineLenght.Format(textBox.Text, 80)); //Gibt den ganzen Text zurück
                }
            }
        }

        private List<string> GetAllDllNames()
        {
            List<string> dlls = new List<string>();

            if (dlls != null)
            {
                dlls.Clear();
            }

            dlls = GetGlobalDllNames();
            if (GetInternalDllNames() != null)
            {
                dlls.AddRange(GetInternalDllNames());
            }
            
            dlls.Sort();

            return dlls;
        }

        private List<string> GetGlobalDllNames()
        {
            List<string> dlls = new List<string>();

            if (dlls != null)
            {
                dlls.Clear();
            }

            foreach (ProcessModule module in Process.GetCurrentProcess().Modules)
            {
                dlls.Add(module.ModuleName + Environment.NewLine + module.FileVersionInfo.ProductVersion + Environment.NewLine + module.FileName);
            }

            dlls.Sort();

            return dlls;
        }

        private List<string> GetInternalDllNames()
        {
            List<string> dlls = new List<string>();
            string dllVersion = "";

            if (dlls != null)
            {
                dlls.Clear();
            }

            DirectoryInfo ParentDirectory = new DirectoryInfo(Application.StartupPath);
            foreach (FileInfo fi in ParentDirectory.GetFiles())
            {
                if (fi.Extension.ToLower() == ".dll")
                {
                    Assembly assembly = Assembly.LoadFrom(fi.FullName.Remove(0, fi.FullName.LastIndexOf("\\") + 1));

                    dllVersion = assembly.ToString().Remove(0, assembly.ToString().IndexOf("Version=") + 8);
                    dllVersion = dllVersion.Remove(dllVersion.IndexOf(","));

                    dlls.Add(String.Concat(fi.FullName.Remove(0, fi.FullName.LastIndexOf("\\") + 1), Environment.NewLine, dllVersion, Environment.NewLine, fi.FullName));
                }
            }

            dlls.Sort();

            return dlls;
        }

        private string CreateDllInfo()
        {
            string dllInfo = "";

            if (radioButtonAll.Checked)
            {
                foreach (var item in GetAllDllNames())
                {
                    dllInfo = String.Concat(dllInfo, item, Environment.NewLine, Environment.NewLine);
                }
            }
            else
            {
                foreach (var item in GetInternalDllNames())
                {
                    dllInfo = String.Concat(dllInfo, item, Environment.NewLine, Environment.NewLine);
                }
            }

            while (dllInfo.EndsWith("\n") || dllInfo.EndsWith("\r"))
            {
                dllInfo = dllInfo.Remove(dllInfo.Length - 1);
            }

            return dllInfo;
        }

        private void SetWindow(int width, int hight)
        {
            //Maximalabmaße prüfen
            if (width < 500)
            {
                width = 500;
            }
            if (width > 800)
            {
                width = 800;
            }

            if (hight < 400)
            {
                hight = 400;
            }
            if (hight > 600)
            {
                hight = 600;
            }

            //Fenster setzen
            this.Size = new Size(width, hight);
            this.MaximumSize = new Size(width, hight);
            this.MinimumSize = new Size(width, hight);
        }

        private void Appearance()
        {
            //Sind im Startup Verzeichnis keine eigenen DLLs, dann ist die EXE und die DLLs wahrscheinlich gepackt. Den Button 'DLL-Info' ausblenden, weil es sonst zu Fehler kommt
            bool dllExist = false;

            DirectoryInfo ParentDirectory = new DirectoryInfo(Application.StartupPath);
            foreach (FileInfo fi in ParentDirectory.GetFiles())
            {
                if (fi.Extension.ToLower() == ".dll")
                {
                    dllExist = true;
                }
            }

            buttonDllInfo.Enabled = dllExist;
            buttonDllInfo.Visible = dllExist;
        }
    }
}