using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using Nullstack.Utilities.Guidgen2.Properties;

namespace Nullstack.Utilities.Guidgen2
{
    public partial class GuidInterface : Form
    {

        #region Format Strings

        // format strings! use standard string.format notation
        // args 0-15 are the 0th to 15th bytes of the guid specified as integers
        // args 16 and 17 are the open and close brace ('{', '}') because you may need them (odd behaviour of string.format re: {15,X2}}} situations)
        private static readonly string FORMAT_IMPLEMENTOLECREATE = "// {{{0:X2}{1:X2}{2:X2}{3:X2}-{4:X2}{5:X2}-{6:x2}{7:x2}-{8:X2}{9:X2}-{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}{17}" + Environment.NewLine + "IMPLEMENT_OLECREATE(<<class>>, <<external_name>>, " + Environment.NewLine + "0x{0:x}{1:x}{2:x}{3:x}, 0x{4:x}{5:x}, 0x{6:x}{7:x}, 0x{8:x}, 0x{9:x}, 0x{10:x}, 0x{11:x}, 0x{12:x}, 0x{13:x}, 0x{14:x}, 0x{15:x});";
        private static readonly string FORMAT_DEFINEGUID = "// {{{0:X2}{1:X2}{2:X2}{3:X2}-{4:X2}{5:X2}-{6:x2}{7:x2}-{8:X2}{9:X2}-{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}{17}" + Environment.NewLine + "DEFINE_GUID(<<name>>, " + Environment.NewLine + "0x{0:x}{1:x}{2:x}{3:x}, 0x{4:x}{5:x}, 0x{6:x}{7:x}, 0x{8:x}, 0x{9:x}, 0x{10:x}, 0x{11:x}, 0x{12:x}, 0x{13:x}, 0x{14:x}, 0x{15:x});";
        private static readonly string FORMAT_STATICCONST = "// {{{0:X2}{1:X2}{2:X2}{3:X2}-{4:X2}{5:X2}-{6:x2}{7:x2}-{8:X2}{9:X2}-{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}{17}" + Environment.NewLine + "static const GUID <<name>> = " + Environment.NewLine + "{{ 0x{0:x}{1:x}{2:x}{3:x}, 0x{4:x}{5:x}, 0x{6:x}{7:x}, {{ 0x{8:x}, 0x{9:x}, 0x{10:x}, 0x{11:x}, 0x{12:x}, 0x{13:x}, 0x{14:x}, 0x{15:x} }} }};";
        private static readonly string FORMAT_REGISTRY = "{{{0:X2}{1:X2}{2:X2}{3:X2}-{4:X2}{5:X2}-{6:x2}{7:x2}-{8:X2}{9:X2}-{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}{17}";
        private static readonly string FORMAT_CSASSEMBLYINFO = "[assembly: Guid(\"{0:x2}{1:x2}{2:x2}{3:x2}-{4:x2}{5:x2}-{6:x2}{7:x2}-{8:x2}{9:x2}-{10:x2}{11:x2}{12:x2}{13:x2}{14:x2}{15:x2}\")]";
        private static readonly string FORMAT_VBASSEMBLYINFO = "<Assembly: Guid(\"{0:x2}{1:x2}{2:x2}{3:x2}-{4:x2}{5:x2}-{6:x2}{7:x2}-{8:x2}{9:x2}-{10:x2}{11:x2}{12:x2}{13:x2}{14:x2}{15:x2}\")>";
        private static readonly string FORMAT_PLAIN = "{0:X2}{1:X2}{2:X2}{3:X2}-{4:X2}{5:X2}-{6:x2}{7:x2}-{8:X2}{9:X2}-{10:X2}{11:X2}{12:X2}{13:X2}{14:X2}{15:X2}";

        #endregion

        #region API Imports

        private const Int32 WM_SYSCOMMAND = 0x112;
        private const Int32 WS_MAXIMIZEBOX = 0x10000;
        private const Int32 GWL_STYLE = (-16);
        private const Int32 MF_REMOVE = 0x1000;
        private const Int32 MF_SEPARATOR = 0x800;
        private const Int32 MF_BYPOSITION = 0x400;
        private const Int32 MF_DISABLED = 0x2;
        private const Int32 MF_GRAYED = 0x1;
        private const Int32 MF_STRING = 0x0;
        private const Int32 IDM_ABOUT = 1000;
        private const Int32 IDM_MAXIMIZE = 1001;
        private const Int32 IDM_SIZE = 1002;

        [DllImport("User32.Dll")]
        private static extern IntPtr DrawMenuBar(IntPtr hwnd);

        [DllImport("user32.dll")]
        private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

        [DllImport("User32.Dll")]
        private static extern IntPtr GetMenuItemCount(IntPtr hMenu);

        [DllImport("user32.dll")]
        private static extern IntPtr InsertMenu(IntPtr hMenu, Int32 wPosition, Int32 wFlags, Int32 wIDNewItem, string lpNewItem);

        [DllImport("user32.dll")]
        private static extern IntPtr ModifyMenu(IntPtr hMenu, Int32 wPosition, Int32 wFlags, Int32 wIDNewItem, string lpNewItem);

        [DllImport("user32.dll")]
        private static extern IntPtr GetWindowLong(IntPtr hWnd, Int32 wIndex);

        [DllImport("user32.dll")]
        private static extern IntPtr SetWindowLong(IntPtr hWnd, Int32 wIndex, IntPtr dwNewLong);

        #endregion

        #region Variables

        private GuidFormatStyles _format;
        private Guid _guid;
        private string _result;

        #endregion

        #region Constructors

        public GuidInterface() {
            InitializeComponent();

            btnCopy.Text = Resources.btnCopy;
            btnExit.Text = Resources.btnExit;
            btnGenerate.Text = Resources.btnGenerate;
            chkAlwaysOnTop.Text = Resources.chkAlwaysOnTop;
            grpFormat.Text = Resources.strGUIDFormat;
            grpResult.Text = Resources.strResult;
            lblInstructions.Text = Resources.strInstructions;
            radFormat1.Text = Resources.radFormat1;
            radFormat2.Text = Resources.radFormat2;
            radFormat3.Text = Resources.radFormat3;
            radFormat4.Text = Resources.radFormat4;
            radFormat5.Text = Resources.radFormat5;
            radFormat6.Text = Resources.radFormat6;
            radFormat7.Text = Resources.radFormat7;

            radFormat1.CheckedChanged += radFormat_CheckedChanged;
            radFormat2.CheckedChanged += radFormat_CheckedChanged;
            radFormat3.CheckedChanged += radFormat_CheckedChanged;
            radFormat4.CheckedChanged += radFormat_CheckedChanged;
            radFormat5.CheckedChanged += radFormat_CheckedChanged;
            radFormat6.CheckedChanged += radFormat_CheckedChanged;
            radFormat7.CheckedChanged += radFormat_CheckedChanged;
            chkAlwaysOnTop.CheckedChanged += chkAlwaysOnTop_Checked;

            _format = GuidFormatStyles.IMPLEMENT_OLECREATE;

            NewGuid();
        }

        #endregion

        #region Properties

        public GuidFormatStyles Format {
            get {
                return _format;
            }
            set {
                if (_format != value) {
                    _format = value;
                    CalculateResult();
                }
            }
        }

        public Guid Guid {
            get {
                return _guid;
            }
        }

        public string FormattedGuid {
            get {
                return _result;
            }
        }

        #endregion

        #region Public Methods

        public void NewGuid() {
            _guid = Guid.NewGuid();
            CalculateResult();
        }

        public void CopyToClipboard() {
            Clipboard.SetText(_result);
        }

        #endregion

        #region Form Overrides

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            IntPtr sysMenuHandle = GetSystemMenu(this.Handle, false);
            IntPtr menuCount = GetMenuItemCount(sysMenuHandle);
            IntPtr windowStyle = GetWindowLong(this.Handle, GWL_STYLE);

            // disable Maximize and Size from System Menu
            ModifyMenu(sysMenuHandle, menuCount.ToInt32() - 3, MF_BYPOSITION | MF_GRAYED, IDM_MAXIMIZE, Resources.mnuMaximize);
            ModifyMenu(sysMenuHandle, menuCount.ToInt32() - 5, MF_BYPOSITION | MF_GRAYED, IDM_SIZE, Resources.mnuSize);

            // add About to the system menu
            InsertMenu(sysMenuHandle, menuCount.ToInt32(), MF_BYPOSITION | MF_SEPARATOR, 0, string.Empty);
            InsertMenu(sysMenuHandle, menuCount.ToInt32() + 1, MF_BYPOSITION, IDM_ABOUT, Resources.mnuAbout);

            windowStyle = new IntPtr(windowStyle.ToInt32() & ~WS_MAXIMIZEBOX);
            SetWindowLong(this.Handle, GWL_STYLE, windowStyle);

            // redraw the menu bar
            DrawMenuBar(this.Handle);
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_SYSCOMMAND)
            {
                switch (m.WParam.ToInt32())
                {
                    case IDM_ABOUT:
                        (new About()).ShowDialog(this);
                        return;
                    default:
                        break;
                }
            }
            base.WndProc(ref m);
        }

        #endregion

        #region Private Helpers

        private void CalculateResult() {
            string format = "";
            switch (_format) {
                case GuidFormatStyles.IMPLEMENT_OLECREATE:
                    format = FORMAT_IMPLEMENTOLECREATE;
                    break;
                case GuidFormatStyles.DEFINE_GUID:
                    format = FORMAT_DEFINEGUID;
                    break;
                case GuidFormatStyles.STATIC_CONST_STRUCT:
                    format = FORMAT_STATICCONST;
                    break;
                case GuidFormatStyles.REGISTRY_FORMAT:
                    format = FORMAT_REGISTRY;
                    break;
                case GuidFormatStyles.CS_ASSEMBLYINFO:
                    format = FORMAT_CSASSEMBLYINFO;
                    break;
                case GuidFormatStyles.VB_ASSEMBLYINFO:
                    format = FORMAT_VBASSEMBLYINFO;
                    break;
                case GuidFormatStyles.PLAIN:
                    format = FORMAT_PLAIN;
                    break;
            }

            byte[] b = _guid.ToByteArray();
            int[] i = new int[16];
            for (int n = 0; n < 16; n++) {
                i[n] = (int)b[n];
            }
            _result = string.Format(format, i[3], i[2], i[1], i[0], i[5], i[4], i[7], i[6], i[8], i[9], i[10], i[11], i[12], i[13], i[14], i[15], "{", "}");
            lblResult.Text = _result;
        }

        private void radFormat_CheckedChanged(object sender, EventArgs e) {
            GuidFormatStyles value = GuidFormatStyles.PLAIN;
            if (radFormat1.Checked) {
                value = GuidFormatStyles.IMPLEMENT_OLECREATE;
            } else if (radFormat2.Checked) {
                value = GuidFormatStyles.DEFINE_GUID;
            } else if (radFormat3.Checked) {
                value = GuidFormatStyles.STATIC_CONST_STRUCT;
            } else if (radFormat4.Checked) {
                value = GuidFormatStyles.REGISTRY_FORMAT;
            } else if (radFormat5.Checked) {
                value = GuidFormatStyles.CS_ASSEMBLYINFO;
            } else if (radFormat6.Checked) {
                value = GuidFormatStyles.VB_ASSEMBLYINFO;
            } else if (radFormat7.Checked) {
                value = GuidFormatStyles.PLAIN;
            }

            if (_format != value) {
                _format = value;
                CalculateResult();
            }
        }

        #endregion

        #region GUI Event Handlers

        private void btnGenerate_Click(object sender, EventArgs e) {
            NewGuid();
        }

        private void btnExit_Click(object sender, EventArgs e) {
            Close();
        }

        private void btnCopy_Click(object sender, EventArgs e) {
            CopyToClipboard();
        }

        private void chkAlwaysOnTop_Checked(object sender, EventArgs e) {
            this.TopMost = chkAlwaysOnTop.Checked;
        }

        #endregion

    }
}