//Target:Winform
//RefNuGet:jacobslusser.ScintillaNET,3.5.6

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using ScintillaNET;

[assembly: AssemblyProduct("Filename Vertical Editor")]
[assembly: AssemblyTitle("Edit multi file name at one time")]
[assembly: AssemblyCopyright("Copyright © V 2016")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]
[assembly: Guid("C7102B4E-858D-470B-A3FB-630FC730EC7E")] //for ILRepack of ScintillaNET

namespace FilenameVerticalEditor
{
    internal class FilesNameComparer : IComparer<string>
    {
        //from http://www.cnblogs.com/linyechengwei/p/3224200.html with modify
        public int Compare(string x, string y)
        {
            var arr1 = x.Normalize(NormalizationForm.FormKC).ToCharArray();
            var arr2 = y.Normalize(NormalizationForm.FormKC).ToCharArray();
            int i = 0, j = 0;
            while (i < arr1.Length && j < arr2.Length)
            {
                if (char.IsDigit(arr1[i]) && char.IsDigit(arr2[j]))
                {
                    string s1 = "", s2 = "";
                    while (i < arr1.Length && char.IsDigit(arr1[i]))
                    {
                        s1 += arr1[i];
                        i++;
                    }
                    while (j < arr2.Length && char.IsDigit(arr2[j]))
                    {
                        s2 += arr2[j];
                        j++;
                    }

                    int a, b;

                    // ReSharper disable RedundantAssignment
                    var ca = int.TryParse(s1, out a);
                    Debug.Assert(ca);
                    var cb = int.TryParse(s2, out b);
                    Debug.Assert(cb);
                    // ReSharper restore RedundantAssignment

                    if (a > b)
                    {
                        return 1;
                    }

                    if (a < b)
                    {
                        return -1;
                    }
                }
                else
                {
                    if (arr1[i] > arr2[j])
                    {
                        return 1;
                    }
                    if (arr1[i] < arr2[j])
                    {
                        return -1;
                    }
                    i++;
                    j++;
                }
            }

            if (arr1.Length == arr2.Length)
            {
                return 0;
            }

            return arr1.Length > arr2.Length ? 1 : -1;
        }
    }

    internal static class UtilityKeyCode
    {
        //from http://stackoverflow.com/questions/5825820/how-to-capture-the-character-on-different-locale-keyboards-in-wpf-c
        private enum MapType : uint
        {
            MapvkVkToVsc = 0x0,
            //MapvkVScToVk = 0x1,
            //MapvkVkToChar = 0x2,
            //MapvkVScToVkex = 0x3,
        }

        [DllImport("user32.dll")]
        private static extern int ToUnicode(
            uint wVirtKey,
            uint wScanCode,
            byte[] lpKeyState,
            [Out, MarshalAs(UnmanagedType.LPWStr, SizeParamIndex = 4)]
            StringBuilder pwszBuff,
            int cchBuff,
            uint wFlags);

        [DllImport("user32.dll")]
        private static extern bool GetKeyboardState(byte[] lpKeyState);

        [DllImport("user32.dll")]
        private static extern uint MapVirtualKey(uint uCode, MapType uMapType);

        public static char ToChar(this Keys key)
        {
            var ch = '\0';

            var virtualKey = (int)key;
            var keyboardState = new byte[256];
            GetKeyboardState(keyboardState);

            var scanCode = MapVirtualKey((uint)virtualKey, MapType.MapvkVkToVsc);
            var stringBuilder = new StringBuilder(2);

            var result = ToUnicode((uint)virtualKey, scanCode, keyboardState, stringBuilder, stringBuilder.Capacity, 0);
            switch (result)
            {
                case -1:
                    break;

                case 0:
                    break;

                case 1:
                    ch = stringBuilder[0];
                    break;

                default:
                    ch = stringBuilder[0];
                    break;
            }
            return ch;
        }
    }

    internal static class UtilityString
    {
        public static int GetByteLength(this string me)
        {
            return Encoding.Default.GetByteCount(me);
        }

        public static string PadRightByByteCount(this string me, int totalWidth, char paddingChar = ' ')
        {
            var a = totalWidth - me.GetByteLength();
            return a > 0
                ? me + "".PadRight(a)
                : me;
        }
    }

    internal class ExScintilla : Scintilla
    {
        private class SelWrap
        {
            public int Begin { get; set; }
            public int Length { get; set; }
        }

        private enum MappedAction
        {
            Delete,
            Left,
            Right,
            MoveLeft,
            MoveRight,
            IncSelLen,
            DecSelLen,
        }

        public ExScintilla()
        {
            VirtualSpaceOptions = VirtualSpace.RectangularSelection;
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            // ReSharper disable once AssignmentInConditionalExpression
            if (e.Alt || Selections.Count < 2)
            {
                base.OnKeyDown(e);
                return;
            }

            e.SuppressKeyPress = true;

            //LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
            // >> EDITOR :: COLUMN MODE IMPLEMENT <<

            var tb = this;
            if (tb.Selections.Count < 2) return; // no in column mode

            e.SuppressKeyPress = true; //block input, handle by below code

            MappedAction? action = null;
            if (e.KeyCode == Keys.Delete && e.KeyData == Keys.Delete && e.KeyValue == 46)
            {
                action = MappedAction.Delete;
            }

            if (e.KeyCode == Keys.Left && e.KeyData == Keys.Left && e.KeyValue == 37)
            {
                action = MappedAction.Left;
            }

            if (e.KeyCode == Keys.Right && e.KeyData == Keys.Right && e.KeyValue == 39)
            {
                action = MappedAction.Right;
            }

            if (e.Shift && e.KeyData == (Keys.Shift | Keys.Left) && e.KeyCode == Keys.Left && e.KeyValue == 37)
            {
                action = MappedAction.MoveLeft;
            }

            if (e.Shift && e.KeyData == (Keys.Right | Keys.Shift) && e.KeyCode == Keys.Right && e.KeyValue == 39)
            {
                action = MappedAction.MoveRight;
            }

            if (e.Control && e.KeyData == (Keys.Control | Keys.Left) && e.KeyCode == Keys.Left && e.KeyValue == 37)
            {
                action = MappedAction.DecSelLen;
            }

            if (e.Control && e.KeyData == (Keys.Right | Keys.Control) && e.KeyCode == Keys.Right && e.KeyValue == 39)
            {
                action = MappedAction.IncSelLen;
            }

            string input;

            if (action.HasValue)
            {
                input = "\0";
            }
            else
            {
                input = e.KeyCode.ToChar().ToString();
                if (input == "\0")
                {
                    //SystemSounds.Beep.Play();
                    return;
                }
            }

            var selections = tb.Selections
                .OrderBy(p => p.Start)
                .Select(p => new SelWrap { Begin = p.Start, Length = p.End - p.Start })
                .ToArray();

            var contents = new string[selections.Length];
            for (var i = 0; i < contents.Length; i++)
            {
                contents[i] = input;
            }

            if (input == "\u0018" || input == "\u0003") //^X or ^C
            {
                for (var i = 0; i < selections.Length; i++)
                {
                    contents[i] = tb.GetTextRange(selections[i].Begin, selections[i].Length);
                }
                Clipboard.SetText(string.Join(Environment.NewLine, contents));

                if (input == "\u0018") // ^X
                {
                    for (var i = 0; i < selections.Length; i++)
                    {
                        contents[i] = "";
                    }
                }
                else
                {
                    return;
                }
            }

            if (input == "\u0016") //^V
            {
                for (var i = 0; i < selections.Length; i++)
                {
                    contents[i] = "";
                }
                var clipLines = Clipboard.GetText().Split(new[] { Environment.NewLine }, StringSplitOptions.None);
                for (var i = 0; i < contents.Length && i < contents.Length; i++)
                {
                    contents[i] = clipLines[i];
                }
            }

            //do process every caret(or selection)
            for (var i = 0; i < selections.Length; i++)
            {
                var item = selections[i];

                if (MappedAction.IncSelLen == action)
                {
                    item.Length++;
                }
                else if (MappedAction.DecSelLen == action)
                {
                    item.Length--;
                }
                else
                {
                    if (action.HasValue) // before process, copy
                    {
                        for (var c = 0; c < selections.Length; c++)
                        {
                            contents[c] = tb.GetTextRange(selections[c].Begin, selections[c].Length);
                        }
                    }

                    var removeSelected = item.Length > 0;
                    if (removeSelected) //if has selected text, just clean
                    {
                        tb.DeleteRange(item.Begin, item.Length);
                        for (var j = i + 1; j < selections.Length; j++)
                        {
                            selections[j].Begin -= item.Length;
                        }
                    }

                    if (input == "\b") //backspace
                    {
                        if (item.Length != 0) continue;

                        //delete a char before caret
                        tb.DeleteRange(item.Begin - 1, 1);
                        for (var j = i; j < selections.Length; j++)
                        {
                            selections[j].Begin--;
                        }
                    }
                    else if (MappedAction.Delete == action)
                    {
                        selections[i].Length = 0;
                        if (removeSelected) continue;

                        //delete a char after caret
                        tb.DeleteRange(item.Begin, 1);
                        for (var j = i + 1; j < selections.Length; j++)
                        {
                            selections[j].Begin--;
                        }
                    }
                    else if (MappedAction.Left == action || MappedAction.MoveLeft == action)
                    {
                        selections[i].Begin--;

                        if (MappedAction.MoveLeft == action)
                        {
                            selections[i].Length = contents[i].Length;
                            tb.InsertText(item.Begin, contents[i]);
                        }
                        else
                        {
                            tb.InsertText(item.Begin + 1, contents[i]);
                        }

                        for (var j = i + 1; j < selections.Length; j++) selections[j].Begin += contents[i].Length;
                    }
                    else if (MappedAction.Right == action || MappedAction.MoveRight == action)
                    {
                        selections[i].Begin++;

                        if (MappedAction.MoveRight == action)
                        {
                            selections[i].Length = contents[i].Length;
                            tb.InsertText(item.Begin, contents[i]);
                        }
                        else
                        {
                            tb.InsertText(item.Begin - 1, contents[i]);
                        }

                        for (var j = i + 1; j < selections.Length; j++) selections[j].Begin += contents[i].Length;
                    }
                    else
                    {
                        //just insert that

                        tb.InsertText(item.Begin, contents[i]);
                        item.Begin++;
                        for (var j = i + 1; j < selections.Length; j++) selections[j].Begin += contents[i].Length;
                    }
                }
            }

            //restore select status
            tb.ClearSelections();
            tb.SetSelection(selections[0].Begin, selections[0].Begin + selections[0].Length);
            for (var i = 1; i < selections.Length; i++)
            {
                var item = selections[i];
                tb.AddSelection(item.Begin, item.Begin + item.Length);
            }
        }

        private int _maxLineNumberCharLength1;

        protected override void OnTextChanged(EventArgs e)
        {
            var maxLineNumberCharLength = Lines.Count.ToString().Length;
            if (maxLineNumberCharLength == _maxLineNumberCharLength1)
                return;

            const int padding = 2;
            Margins[0].Width = TextWidth(Style.LineNumber, new string('9', maxLineNumberCharLength + 1)) + padding;
            _maxLineNumberCharLength1 = maxLineNumberCharLength;

            base.OnTextChanged(e);
        }
    }

    internal class MainForm : Form
    {
        [STAThread]
        private static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainForm());
        }

        private MainForm()
        {
            InitUi();
        }

        private void InitUi()
        {
            //LLLLLLLLLLLLLL
            // >> FORMCNF <<

            ClientSize = new Size(640, 480);
            Text = Application.ProductName;
            AllowDrop = true;

            //LLLLLLLLLLLLLL
            // >> EDITOR <<

            var editor = new ExScintilla
            {
                Dock = DockStyle.Fill,
                Text = "<<Drag a *dir* in to here>>",
            };

            Controls.Add(editor);

            editor.Margins[0].Width = 16;
            editor.Margins[0].Type = MarginType.Number;

            editor.ReadOnly = true;

            editor.Styles[Style.Cpp.Default].Font = "fixedsys";
            editor.Styles[Style.Cpp.Default].Size = 12;

            //LLLLLLLLLLLLLL
            // >> TOOLBAR <<

            var toolbar = new ToolStrip { Dock = DockStyle.Top, GripStyle = ToolStripGripStyle.Hidden, RenderMode = ToolStripRenderMode.System };
            Controls.Add(toolbar);

            toolbar.Items.Add(new ToolStripLabel("Usage: Drop >> Edit >> Click ") { Font = new Font(Font, FontStyle.Italic | FontStyle.Bold) });
            toolbar.Items.Add(new ToolStripLabel("Go!") { Font = new Font(Font, FontStyle.Italic | FontStyle.Bold | FontStyle.Underline) });
            toolbar.Items.Add(new ToolStripLabel(" >> Click ") { Font = new Font(Font, FontStyle.Italic | FontStyle.Bold) });
            toolbar.Items.Add(new ToolStripLabel("Reset") { Font = new Font(Font, FontStyle.Italic | FontStyle.Bold | FontStyle.Underline) });
            toolbar.Items.Add(new ToolStripLabel(" for again") { Font = new Font(Font, FontStyle.Italic | FontStyle.Bold) });

            var mnuReset = new ToolStripButton("Reset");
            toolbar.Items.Add(mnuReset);
            mnuReset.Alignment = ToolStripItemAlignment.Right;
            mnuReset.Font = new Font(mnuReset.Font, FontStyle.Underline);

            var mnuGo = new ToolStripButton("Go!");
            toolbar.Items.Add(mnuGo);
            mnuGo.Alignment = ToolStripItemAlignment.Right;
            mnuGo.Font = new Font(mnuGo.Font, FontStyle.Underline);

            mnuReset.Click += delegate
            {
                editor.ReadOnly = false;
                editor.Text = "<<Drag a *dir* in to here>>";
                editor.ClearSelections();
                editor.ScrollRange(0, 0);
                editor.ReadOnly = true;
            };

            mnuGo.Click += delegate
            {
                if (editor.ReadOnly)
                {
                    MessageBox.Show("What?");
                    return;
                }

                var outputFilename = Path.GetTempFileName();
                var batFilename = outputFilename + ".bat";

                File.WriteAllText(batFilename, editor.Text, Encoding.Default);

                var p = new Process
                {
                    StartInfo = new ProcessStartInfo()
                    {
                        FileName = "cmd",
                        Arguments = $"/c chcp {Encoding.Default.CodePage} && prompt $G && {batFilename} > {outputFilename} 2>&1",
                        CreateNoWindow = true,
                        UseShellExecute = false,
                        WindowStyle = ProcessWindowStyle.Hidden,
                    }
                };
                p.Start();
                p.WaitForExit();
                File.Delete(batFilename);

                editor.Text = File.ReadAllText(outputFilename, Encoding.Default);
                File.Delete(outputFilename);

                editor.ReadOnly = true;
            };

            //LLLLLLLLLLLLLL
            // >> DRAGEVT <<

            DragEnter += delegate (object s, DragEventArgs e)
            {
                string[] items;
                e.Effect = e.Data.GetDataPresent(DataFormats.FileDrop)
                                && (items = (string[])e.Data.GetData(DataFormats.FileDrop)).Length == 1
                                && Directory.Exists(items[0])
                    ? DragDropEffects.Link
                    : DragDropEffects.None;
            };

            DragDrop += delegate (object s, DragEventArgs e)
            {
                var dir = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];

                var files = Directory.GetFiles(dir, "*", SearchOption.AllDirectories)
                    .Select(p => p.Substring(dir.Length + 1))
                    .ToArray();

                Array.Sort(files, new FilesNameComparer());

                var lines = new List<string>(files.Length + 5)
                {
                    $"@cd /d \"{dir}\""
                    ,""
                };

                var width = files.Max(p => p.GetByteLength());
                lines.AddRange(files.Select(item => $"move \"{("" + item + "\"").PadRightByByteCount(width + 1)} \"{item}\""));
                editor.ReadOnly = false;
                editor.Text = string.Join(Environment.NewLine, lines);
            };
        }
    }
}