using System;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.Text.RegularExpressions;

namespace PKHeX
{
    public partial class Util
    {
        // Image Layering/Blending Utility
        internal static Bitmap LayerImage(Image baseLayer, Image overLayer, int x, int y, double trans)
        {
            Bitmap overlayImage = (Bitmap)overLayer;
            Bitmap newImage = (Bitmap)baseLayer;
            if (baseLayer == null) return overlayImage;
            for (int i = 0; i < (overlayImage.Width * overlayImage.Height); i++)
            {
                Color newColor = overlayImage.GetPixel(i % (overlayImage.Width), i / (overlayImage.Width));
                Color oldColor = newImage.GetPixel(i % (overlayImage.Width) + x, i / (overlayImage.Width) + y);
                newColor = Color.FromArgb((int)((double)(newColor.A) * trans), newColor.R, newColor.G, newColor.B); // Apply transparency change
                // if (newColor.A != 0) // If Pixel isn't transparent, we'll overwrite the color.
                {
                    // if (newColor.A < 100) 
                    newColor = AlphaBlend(newColor, oldColor);
                    newImage.SetPixel(
                        i % (overlayImage.Width) + x,
                        i / (overlayImage.Width) + y,
                        newColor);
                }
            }
            return newImage;
        }
        internal static Bitmap ChangeOpacity(Image img, double trans)
        {
            if (img == null) return null;
            Bitmap bmp = new Bitmap(img.Width, img.Height); // Determining Width and Height of Source Image
            Graphics graphics = Graphics.FromImage(bmp);
            ColorMatrix colormatrix = new ColorMatrix();
            colormatrix.Matrix33 = (float)trans;
            ImageAttributes imgAttribute = new ImageAttributes();
            imgAttribute.SetColorMatrix(colormatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
            graphics.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttribute);
            graphics.Dispose();   // Releasing all resource used by graphics
            return bmp;
        }
        internal static Color AlphaBlend(Color ForeGround, Color BackGround)
        {
            if (ForeGround.A == 0)
                return BackGround;
            if (BackGround.A == 0)
                return ForeGround;
            if (ForeGround.A == 255)
                return ForeGround;
            int Alpha = Convert.ToInt32(ForeGround.A) + 1;
            int B = Alpha * ForeGround.B + (255 - Alpha) * BackGround.B >> 8;
            int G = Alpha * ForeGround.G + (255 - Alpha) * BackGround.G >> 8;
            int R = Alpha * ForeGround.R + (255 - Alpha) * BackGround.R >> 8;
            int A = ForeGround.A;
            if (BackGround.A == 255)
                A = 255;
            if (A > 255)
                A = 255;
            if (R > 255)
                R = 255;
            if (G > 255)
                G = 255;
            if (B > 255)
                B = 255;
            return Color.FromArgb(Math.Abs(A), Math.Abs(R), Math.Abs(G), Math.Abs(B));
        }

        // Strings and Paths
        internal static FileInfo GetNewestFile(DirectoryInfo directory)
        {
            return directory.GetFiles()
                .Union(directory.GetDirectories().Select(d => GetNewestFile(d)))
                .OrderByDescending(f => (f == null ? DateTime.MinValue : f.LastWriteTime))
                .FirstOrDefault();
        }
        internal static string NormalizePath(string path)
        {
            return Path.GetFullPath(new Uri(path).LocalPath)
               .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
        }
        internal static string GetTempFolder()
        {
            return Path.Combine(Path.GetTempPath(), "3DSSE");
        }
        internal static string GetCacheFolder()
        {
            return Path.Combine(GetBackupLocation(), "cache");
        }
        internal static string GetRegistryValue(string key)
        {
            Microsoft.Win32.RegistryKey currentUser = Microsoft.Win32.Registry.CurrentUser;
            Microsoft.Win32.RegistryKey key3 = currentUser.OpenSubKey(GetRegistryBase());
            if (key3 == null)
                return null;

            string str = key3.GetValue(key) as string;
            key3.Close();
            currentUser.Close();
            return str;
        }
        internal static string GetRegistryBase()
        {
            return @"SOFTWARE\CYBER Gadget\3DSSaveEditor";
        }
        internal static string GetBackupLocation()
        {
            string registryValue = GetRegistryValue("Location");
            if (!string.IsNullOrEmpty(registryValue))
            {
                Directory.CreateDirectory(registryValue);
                return registryValue;
            }
            string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal) + Path.DirectorySeparatorChar + "3DSSaveBank";
            Directory.CreateDirectory(path);
            return path;
        }
        internal static string GetSDFLocation()
        {
            try
            {
                // Start by checking if the 3DS file path exists or not.
                string path_SDF = null;
                string[] DriveList = Environment.GetLogicalDrives();
                for (int i = 1; i < DriveList.Length; i++) // Skip first drive (some users still have floppy drives and would chew up time!)
                {
                    string potentialPath_SDF = NormalizePath(Path.Combine(DriveList[i], "filer" + Path.DirectorySeparatorChar + "UserSaveData"));
                    if (Directory.Exists(potentialPath_SDF))
                    { path_SDF = potentialPath_SDF; break; }
                }
                if (path_SDF == null)
                    return null;
                else
                {
                    // 3DS data found in SD card reader. Let's get the title folder location!
                    string[] folders = Directory.GetDirectories(path_SDF, "*", System.IO.SearchOption.TopDirectoryOnly);

                    // Loop through all the folders in the Nintendo 3DS folder to see if any of them contain 'title'.
                    for (int i = folders.Length - 1; i >= 0; i--)
                    {
                        if (File.Exists(Path.Combine(folders[i], "000011c4" + Path.DirectorySeparatorChar + "main"))) return Path.Combine(folders[i], "000011c4"); // OR
                        if (File.Exists(Path.Combine(folders[i], "000011c5" + Path.DirectorySeparatorChar + "main"))) return Path.Combine(folders[i], "000011c5"); // AS
                        if (File.Exists(Path.Combine(folders[i], "0000055d" + Path.DirectorySeparatorChar + "main"))) return Path.Combine(folders[i], "0000055d"); // X
                        if (File.Exists(Path.Combine(folders[i], "0000055e" + Path.DirectorySeparatorChar + "main"))) return Path.Combine(folders[i], "0000055e"); // Y
                    }
                    return null; // Fallthrough
                }
            }
            catch { return null; }
        }
        internal static string CleanFileName(string fileName)
        {
            return Path.GetInvalidFileNameChars().Aggregate(fileName, (current, c) => current.Replace(c.ToString(), string.Empty));
        }
        internal static string TrimFromZero(string input)
        {
            int index = input.IndexOf('\0');
            if (index < 0)
                return input;

            return input.Substring(0, index);
        }
        internal static string[] getStringList(string f, string l)
        {
            object txt = Properties.Resources.ResourceManager.GetObject("text_" + f + "_" + l); // Fetch File, \n to list.
            List<string> rawlist = ((string)txt).Split(new char[] { '\n' }).ToList();

            string[] stringdata = new string[rawlist.Count];
            for (int i = 0; i < rawlist.Count; i++)
                stringdata[i] = rawlist[i].Trim();

            return stringdata;
        }

        // Randomization
        internal static Random rand = new Random();
        internal static uint rnd32()
        {
            return (uint)(rand.Next(1 << 30)) << 2 | (uint)(rand.Next(1 << 2));
        }

        // Data Retrieval
        internal static int ToInt32(TextBox tb)
		{
			string value = tb.Text;
			return ToInt32(value);
		}
        internal static uint ToUInt32(TextBox tb)
		{
			string value = tb.Text;
			return ToUInt32(value);
		}
        internal static int ToInt32(MaskedTextBox tb)
        {
            string value = tb.Text;
            return ToInt32(value);
        }
        internal static uint ToUInt32(MaskedTextBox tb)
        {
            string value = tb.Text;
            return ToUInt32(value);
        }
        internal static int ToInt32(String value)
        {
            value = value.Replace(" ", "");
			if (String.IsNullOrEmpty(value))
				return 0;
            try
			{
				value = value.TrimEnd(new char[]{'_'});
			    return Int32.Parse(value);
            }
            catch { return 0; }
        }
        internal static uint ToUInt32(String value)
        {
            value = value.Replace(" ", "");
            if (String.IsNullOrEmpty(value))
                return 0; 
            try
            {
				value = value.TrimEnd(new char[]{'_'});
                return UInt32.Parse(value);
            }
            catch { return 0; }
        }
        internal static uint getHEXval(TextBox tb)
        {
            if (tb.Text == null)
                return 0;
            string str = getOnlyHex(tb.Text);
            return UInt32.Parse(str, NumberStyles.HexNumber);
        }
        internal static int getIndex(ComboBox cb)
        {
            int val = 0;
			if (cb.SelectedValue == null)
				return 0;

            try
			{ val = Util.ToInt32(cb.SelectedValue.ToString()); }
            catch
            { val = cb.SelectedIndex; if (val < 0) val = 0; }
            return val;
        }
        internal static string getOnlyHex(string str)
        {
            if (str == null) return "0";

            char c;
            string s = "";

            for (int i = 0; i < str.Length; i++)
            {
                c = str[i];
                // filter for hex
                if ((c < 0x0047 && c > 0x002F) || (c < 0x0067 && c > 0x0060))
                    s+= c;
                else
                    System.Media.SystemSounds.Beep.Play();
            }
            if (s.Length == 0)
                s = "0";
            return s;
        }

        // Data Manipulation
        internal static void Shuffle<T>(T[] array)
        {
            int n = array.Length;
            for (int i = 0; i < n; i++)
            {
                int r = i + (int)(rand.NextDouble() * (n - i));
                T t = array[r];
                array[r] = array[i];
                array[i] = t;
            }
        }

        // Form Manipulation
        internal static void TranslateInterface(string FORM_NAME, string lang, Control.ControlCollection Controls, MenuStrip menu = null)
        {
            // Fetch a File
            // Check to see if a the translation file exists in the same folder as the executable
            string externalLangPath = System.Windows.Forms.Application.StartupPath + Path.DirectorySeparatorChar + "lang_" + lang + ".txt";
            string[] rawlist;
            if (File.Exists(externalLangPath))
                rawlist = File.ReadAllLines(externalLangPath);
            else
            {
                object txt;
                txt = Properties.Resources.ResourceManager.GetObject("lang_" + lang); // Fetch File, \n to list.
                if (txt == null) return; // Translation file does not exist as a resource; abort this function and don't translate UI.
                string[] stringSeparators = new string[] { "\r\n" }; // Resource files are notepad compatible
                rawlist = ((string)txt).Split(stringSeparators, StringSplitOptions.None);
                rawlist = rawlist.Select(i => i.Trim()).ToArray(); // Remove trailing spaces
            }

            string[] stringdata = new string[rawlist.Length];
            int itemsToRename = 0;
            int start = Array.IndexOf(rawlist, "! " + FORM_NAME);
            if (start < 0) return; // No Translation loaded for this Form.
            for (int i = start; i < rawlist.Length; i++)
            {
                // Find our starting point
                if (rawlist[i] == "! " + FORM_NAME) // Start our data
                {
                    // Copy our Control Names and Text to a new array for later processing.
                    for (int j = i + 1; j < rawlist.Length; j++)
                    {
                        if (rawlist[j].Length == 0)
                            continue; // Skip Over Empty Lines, errhandled
                        if (rawlist[j][0].ToString() != "-") // If line is not a comment line...
                        {
                            if (rawlist[j][0].ToString() == "!") // Stop if we have reached the end of translation
                                break; // exit inner loop
                            stringdata[itemsToRename] = rawlist[j]; // Add the entry to process later.
                            itemsToRename++;
                        }
                    }
                    break; // exit outer loop
                }
            }

            // Now that we have our items to rename in: Control = Text format, let's execute the changes!

            for (int i = 0; i < itemsToRename; i++)
            {
                string[] SplitString = Regex.Split(stringdata[i], " = ");
                if (SplitString.Length < 2)
                    continue; // Error in Input, errhandled
                string ctrl = SplitString[0]; // Control to change the text of...
                string text = SplitString[1]; // Text to set Control.Text to...
                Control[] controllist = Controls.Find(ctrl, true);
                if (controllist.Length == 0) // If Control isn't found...
                {
                    // Menu Items can't be found with Controls.Find as they aren't Controls
                    ToolStripDropDownItem TSI = (ToolStripDropDownItem)menu.Items[ctrl];
                    if (TSI != null)
                    {
                        // We'll rename the main and child in a row.
                        string[] ToolItems = Regex.Split(SplitString[1], " ; ");
                        TSI.Text = ToolItems[0]; // Set parent's text first
                        if (TSI.DropDownItems.Count != ToolItems.Length - 1)
                            continue; // Error in Input, errhandled
                        for (int ti = 1; ti <= TSI.DropDownItems.Count; ti++)
                            TSI.DropDownItems[ti - 1].Text = ToolItems[ti]; // Set child text
                    }
                    // If not found, it is not something to rename and is thus skipped.
                }
                else // Set the input control's text.
                    controllist[0].Text = text;
            }
        }

        // Message Displays
        internal static DialogResult Error(params string[] lines)
        {
            System.Media.SystemSounds.Exclamation.Play();
            string msg = String.Join(Environment.NewLine + Environment.NewLine, lines);
            return (DialogResult)MessageBox.Show(msg, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        internal static DialogResult Alert(params string[] lines)
        {
            System.Media.SystemSounds.Asterisk.Play();
            string msg = String.Join(Environment.NewLine + Environment.NewLine, lines);
            return (DialogResult)MessageBox.Show(msg, "Alert", MessageBoxButtons.OK, MessageBoxIcon.Warning);
        }
        internal static DialogResult Prompt(MessageBoxButtons btn, params string[] lines)
        {
            System.Media.SystemSounds.Question.Play();
            string msg = String.Join(Environment.NewLine + Environment.NewLine, lines);
            return (DialogResult)MessageBox.Show(msg, "Prompt", btn, MessageBoxIcon.Asterisk);
        }
    }
}