using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace MinecraftClient
{
    /// <summary>
    /// Allows simultaneous console input and output without breaking user input
    /// (Without having this annoying behaviour : User inp[Some Console output]ut)
    /// </summary>

    public static class ConsoleIO
    {
        public static bool basicIO = false;
        private static IAutoComplete autocomplete_engine;
        private static LinkedList<string> previous = new LinkedList<string>();
        private static readonly object io_lock = new object();
        private static bool reading = false;
        private static string buffer = "";
        private static string buffer2 = "";

        /// <summary>
        /// Reset the IO mechanism and clear all buffers
        /// </summary>

        public static void Reset()
        {
            lock (io_lock)
            {
                if (reading)
                {
                    ClearLineAndBuffer();
                    reading = false;
                    Console.Write("\b \b");
                }
            }
        }

        /// <summary>
        /// Read a password from the standard input
        /// </summary>

        public static string ReadPassword()
        {
            StringBuilder password = new StringBuilder();

            ConsoleKeyInfo k;
            while ((k = Console.ReadKey(true)).Key != ConsoleKey.Enter)
            {
                switch (k.Key)
                {
                    case ConsoleKey.Backspace:
                        if (password.Length > 0)
                        {
                            Console.Write("\b \b");
                            password.Remove(password.Length - 1, 1);
                        }
                        break;

                    case ConsoleKey.Escape:
                    case ConsoleKey.LeftArrow:
                    case ConsoleKey.RightArrow:
                    case ConsoleKey.Home:
                    case ConsoleKey.End:
                    case ConsoleKey.Delete:
                    case ConsoleKey.DownArrow:
                    case ConsoleKey.UpArrow:
                    case ConsoleKey.Tab:
                        break;

                    default:
                        if (k.KeyChar != 0)
                        {
                            Console.Write('*');
                            password.Append(k.KeyChar);
                        }
                        break;
                }
            }

            Console.WriteLine();
            return password.ToString();
        }

        /// <summary>
        /// Read a line from the standard input
        /// </summary>

        public static string ReadLine()
        {
            if (basicIO) { return Console.ReadLine(); }
            ConsoleKeyInfo k = new ConsoleKeyInfo();

            lock (io_lock)
            {
                Console.Write('>');
                reading = true;
                buffer = "";
                buffer2 = "";
            }

            while (k.Key != ConsoleKey.Enter)
            {
                k = Console.ReadKey(true);
                lock (io_lock)
                {
                    if (k.Key == ConsoleKey.V && k.Modifiers == ConsoleModifiers.Control)
                    {
                        string clip = ReadClipboard();
                        foreach (char c in clip)
                            AddChar(c);
                    }
                    else
                    {
                        switch (k.Key)
                        {
                            case ConsoleKey.Escape:
                                ClearLineAndBuffer();
                                break;
                            case ConsoleKey.Backspace:
                                RemoveOneChar();
                                break;
                            case ConsoleKey.Enter:
                                Console.Write('\n');
                                break;
                            case ConsoleKey.LeftArrow:
                                GoLeft();
                                break;
                            case ConsoleKey.RightArrow:
                                GoRight();
                                break;
                            case ConsoleKey.Home:
                                while (buffer.Length > 0) { GoLeft(); }
                                break;
                            case ConsoleKey.End:
                                while (buffer2.Length > 0) { GoRight(); }
                                break;
                            case ConsoleKey.Delete:
                                if (buffer2.Length > 0)
                                {
                                    GoRight();
                                    RemoveOneChar();
                                }
                                break;
                            case ConsoleKey.Oem6:
                                break;
                            case ConsoleKey.DownArrow:
                                if (previous.Count > 0)
                                {
                                    ClearLineAndBuffer();
                                    buffer = previous.First.Value;
                                    previous.AddLast(buffer);
                                    previous.RemoveFirst();
                                    Console.Write(buffer);
                                }
                                break;
                            case ConsoleKey.UpArrow:
                                if (previous.Count > 0)
                                {
                                    ClearLineAndBuffer();
                                    buffer = previous.Last.Value;
                                    previous.AddFirst(buffer);
                                    previous.RemoveLast();
                                    Console.Write(buffer);
                                }
                                break;
                            case ConsoleKey.Tab:
                                if (autocomplete_engine != null && buffer.Length > 0)
                                {
                                    string word_autocomplete = autocomplete_engine.AutoComplete(buffer);
                                    if (!String.IsNullOrEmpty(word_autocomplete) && word_autocomplete != buffer)
                                    {
                                        while (buffer.Length > 0 && buffer[buffer.Length - 1] != ' ') { RemoveOneChar(); }
                                        foreach (char c in word_autocomplete) { AddChar(c); }
                                    }
                                }
                                break;
                            default:
                                if (k.KeyChar != 0)
                                    AddChar(k.KeyChar);
                                break;
                        }
                    }
                }
            }

            lock (io_lock)
            {
                reading = false;
                previous.AddLast(buffer + buffer2);
                return buffer + buffer2;
            }
        }
        
        /// <summary>
        /// Write a string to the standard output, without newline character
        /// </summary>

        public static void Write(string text)
        {
            if (!basicIO)
            {
                lock (io_lock)
                {
                    if (reading)
                    {
                        try
                        {
                            string buf = buffer;
                            string buf2 = buffer2;
                            ClearLineAndBuffer();
                            if (Console.CursorLeft == 0)
                            {
                                Console.CursorLeft = Console.BufferWidth - 1;
                                Console.CursorTop--;
                                Console.Write(' ');
                                Console.CursorLeft = Console.BufferWidth - 1;
                                Console.CursorTop--;
                            }
                            else Console.Write("\b \b");
                            Console.Write(text);
                            buffer = buf;
                            buffer2 = buf2;
                            Console.Write(">" + buffer);
                            if (buffer2.Length > 0)
                            {
                                Console.Write(buffer2 + " \b");
                                for (int i = 0; i < buffer2.Length; i++) { GoBack(); }
                            }
                        }
                        catch (ArgumentOutOfRangeException)
                        {
                            //Console resized: Try again
                            Console.Write('\n');
                            Write(text);
                        }
                    }
                    else Console.Write(text);
                }
            }
            else Console.Write(text);
        }

        /// <summary>
        /// Write a string to the standard output with a trailing newline
        /// </summary>

        public static void WriteLine(string line)
        {
            Write(line + '\n');
        }

        /// <summary>
        /// Write a single character to the standard output
        /// </summary>

        public static void Write(char c)
        {
            Write("" + c);
        }

        /// <summary>
        /// Write a Minecraft-Formatted string to the standard output, using §c color codes
        /// </summary>
        /// <param name="str">String to write</param>
        /// <param name="acceptnewlines">If false, space are printed instead of newlines</param>

        public static void WriteLineFormatted(string str, bool acceptnewlines = true)
        {
            if (basicIO) { Console.WriteLine(str); return; }
            if (!String.IsNullOrEmpty(str))
            {
                if (Settings.chatTimeStamps)
                {
                    int hour = DateTime.Now.Hour, minute = DateTime.Now.Minute, second = DateTime.Now.Second;
                    ConsoleIO.Write(String.Format("{0}:{1}:{2} ", hour.ToString("00"), minute.ToString("00"), second.ToString("00")));
                }
                if (!acceptnewlines) { str = str.Replace('\n', ' '); }
                if (ConsoleIO.basicIO) { ConsoleIO.WriteLine(str); return; }
                string[] subs = str.Split(new char[] { '§' });
                if (subs[0].Length > 0) { ConsoleIO.Write(subs[0]); }
                for (int i = 1; i < subs.Length; i++)
                {
                    if (subs[i].Length > 0)
                    {
                        switch (subs[i][0])
                        {
                            case '0': Console.ForegroundColor = ConsoleColor.Gray; break; //Should be Black but Black is non-readable on a black background
                            case '1': Console.ForegroundColor = ConsoleColor.DarkBlue; break;
                            case '2': Console.ForegroundColor = ConsoleColor.DarkGreen; break;
                            case '3': Console.ForegroundColor = ConsoleColor.DarkCyan; break;
                            case '4': Console.ForegroundColor = ConsoleColor.DarkRed; break;
                            case '5': Console.ForegroundColor = ConsoleColor.DarkMagenta; break;
                            case '6': Console.ForegroundColor = ConsoleColor.DarkYellow; break;
                            case '7': Console.ForegroundColor = ConsoleColor.Gray; break;
                            case '8': Console.ForegroundColor = ConsoleColor.DarkGray; break;
                            case '9': Console.ForegroundColor = ConsoleColor.Blue; break;
                            case 'a': Console.ForegroundColor = ConsoleColor.Green; break;
                            case 'b': Console.ForegroundColor = ConsoleColor.Cyan; break;
                            case 'c': Console.ForegroundColor = ConsoleColor.Red; break;
                            case 'd': Console.ForegroundColor = ConsoleColor.Magenta; break;
                            case 'e': Console.ForegroundColor = ConsoleColor.Yellow; break;
                            case 'f': Console.ForegroundColor = ConsoleColor.White; break;
                            case 'r': Console.ForegroundColor = ConsoleColor.Gray; break;
                        }

                        if (subs[i].Length > 1)
                        {
                            ConsoleIO.Write(subs[i].Substring(1, subs[i].Length - 1));
                        }
                    }
                }
                Console.ForegroundColor = ConsoleColor.Gray;
                ConsoleIO.Write('\n');
            }
        }

        /// <summary>
        /// Write a Minecraft Console Client Log line
        /// </summary>
        /// <param name="text">Text of the log line</param>

        public static void WriteLogLine(string text)
        {
            WriteLineFormatted("§8[MCC] " + text);
        }

        #region Subfunctions
        private static void ClearLineAndBuffer()
        {
            while (buffer2.Length > 0) { GoRight(); }
            while (buffer.Length > 0) { RemoveOneChar(); }
        }
        private static void RemoveOneChar()
        {
            if (buffer.Length > 0)
            {
                try
                {
                    if (Console.CursorLeft == 0)
                    {
                        Console.CursorLeft = Console.BufferWidth - 1;
                        if (Console.CursorTop > 0)
                            Console.CursorTop--;
                        Console.Write(' ');
                        Console.CursorLeft = Console.BufferWidth - 1;
                        if (Console.CursorTop > 0)
                            Console.CursorTop--;
                    }
                    else Console.Write("\b \b");
                }
                catch (ArgumentOutOfRangeException) { /* Console was resized!? */ }
                buffer = buffer.Substring(0, buffer.Length - 1);

                if (buffer2.Length > 0)
                {
                    Console.Write(buffer2 + " \b");
                    for (int i = 0; i < buffer2.Length; i++) { GoBack(); }
                }
            }
        }
        private static void GoBack()
        {
            try
            {
                if (Console.CursorLeft == 0)
                {
                    Console.CursorLeft = Console.BufferWidth - 1;
                    if (Console.CursorTop > 0)
                        Console.CursorTop--;
                }
                else Console.Write('\b');
            }
            catch (ArgumentOutOfRangeException) { /* Console was resized!? */ }
        }
        private static void GoLeft()
        {
            if (buffer.Length > 0)
            {
                buffer2 = "" + buffer[buffer.Length - 1] + buffer2;
                buffer = buffer.Substring(0, buffer.Length - 1);
                Console.Write('\b');
            }
        }
        private static void GoRight()
        {
            if (buffer2.Length > 0)
            {
                buffer = buffer + buffer2[0];
                Console.Write(buffer2[0]);
                buffer2 = buffer2.Substring(1);
            }
        }
        private static void AddChar(char c)
        {
            Console.Write(c);
            buffer += c;
            Console.Write(buffer2);
            for (int i = 0; i < buffer2.Length; i++) { GoBack(); }
        }
        #endregion

        #region Clipboard management
        private static string ReadClipboard()
        {
            string clipdata = "";
            Thread staThread = new Thread(new ThreadStart(
                delegate
                {
                    try
                    {
                        clipdata = Clipboard.GetText();
                    }
                    catch { }
                }
            ));
            staThread.SetApartmentState(ApartmentState.STA);
            staThread.Start();
            staThread.Join();
            return clipdata;
        }
        #endregion

        #region AutoComplete API
        /// <summary>
        /// Set an auto-completion engine for TAB autocompletion
        /// </summary>
        /// <param name="engine">Engine implementing the IAutoComplete interface</param>
        
        public static void SetAutoCompleteEngine(IAutoComplete engine)
        {
            autocomplete_engine = engine;
        }
        #endregion
    }

    /// <summary>
    /// Interface for TAB autocompletion
    /// Allows to use any object which has an AutoComplete() method using the IAutocomplete interface
    /// </summary>

    public interface IAutoComplete
    {
        string AutoComplete(string BehindCursor);
    }
}