using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace HeuristicLab.Common {
  // for controlling console colors
  // see output of Solvers (PrintStats)
  // http://stackoverflow.com/questions/25274019/strange-setconsolescreenbufferinfoex-behavior
  public class ConsoleEx {

    private static readonly ConsoleColor[] colors = (ConsoleColor[])Enum.GetValues(typeof(ConsoleColor));

    static ConsoleEx() {
      // init colors
      /*
IntPtr handle = CreateFile("CONOUT$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, null, 3, 0, IntPtr.Zero);

CONSOLE_SCREEN_BUFFER_INFO_EX currentScreen = new CONSOLE_SCREEN_BUFFER_INFO_EX();
currentScreen.cbSize = (uint)Marshal.SizeOf(currentScreen);

GetConsoleScreenBufferInfoEx(handle, ref currentScreen);

currentScreen.ColorF = currentScreen.Color0;
currentScreen.dwSizeX = 80;
currentScreen.dwSizeY = 30;

SetConsoleScreenBufferInfoEx(handle, ref currentScreen);
CloseHandle(handle);*/
      // Initializing Screen with Testcase

      IntPtr handle = CreateFile("CONOUT$", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, null, 3, 0, IntPtr.Zero);
      CONSOLE_SCREEN_BUFFER_INFO_EX currentScreen = new CONSOLE_SCREEN_BUFFER_INFO_EX();
      currentScreen.cbSize = (uint)Marshal.SizeOf(currentScreen);
      GetConsoleScreenBufferInfoEx(handle, ref currentScreen);


      CONSOLE_SCREEN_BUFFER_INFO_EX newData = currentScreen;

      // newData.srWindowRight = 300;
      // newData.srWindowBottom = 300;

      double startRed = 0;
      double endRed = 1.41;

      double startGreen = -1.41;
      double endGreen = 1.41;

      double startBlue = -3;
      double endBlue = 1;

      double startAlpha = 0;
      double endAlpha = 0;

      // fire
      //var red = new int[] { 1, 49, 98, 146, 173, 195, 217, 240, 255, 255, 255, 255, 255, 255, 255 };
      //var green = new int[] { 0, 0, 0, 0, 0, 0, 35, 79, 117, 147, 175, 205, 234, 255, 255 };
      //var blue = new int[] { 96, 165, 220, 210, 151, 93, 35, 0, 0, 0, 0, 0, 0, 98, 223 };
      var red = new int[16];
      var green = new int[16];
      var blue = new int[16];
      var alpha = new int[16];

      var r = startRed;
      var g = startGreen;
      var b = startBlue;
      var a = startAlpha;
      var n = 15;
      for (int i = 0; i < n; i++) {
        red[i] = (int)Math.Round(Math.Max(Math.Min(1.0, r), 0) * 255);
        green[i] = (int)Math.Round(Math.Max(Math.Min(1.0, g), 0) * 255);
        blue[i] = (int)Math.Round(Math.Max(Math.Min(1.0, b), 0) * 255);
        alpha[i] = (int)Math.Round(Math.Max(Math.Min(1.0, a), 0) * 255);

        r += (endRed - startRed) / n;
        g += (endGreen - startGreen) / n;
        b += (endBlue - startBlue) / n;
        a += (endAlpha - startAlpha) / n;
      }

      newData.ColorF = newData.Color7;
      int h = 0;
      newData.Color0 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color1 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color2 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color3 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color4 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color5 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color6 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color7 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color8 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.Color9 = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.ColorA = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.ColorB = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.ColorC = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.ColorD = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h]; h++;
      newData.ColorE = (alpha[h] << 24) + (blue[h] << 16) + (green[h] << 8) + red[h];
      // newData.ColorF = (r << 16) + (g << 8) + b;

      SetConsoleScreenBufferInfoEx(handle, ref newData);
      Console.ForegroundColor = ConsoleColor.White;

      CloseHandle(handle);
    }

    public static ConsoleColor ColorForValue(double d) {
      //Debug.Assert(d >= 0 && d <= 1.0);
      d = Math.Min(1.0, Math.Max(0.0, d));
      var cIdx = Math.Max(0, (int)Math.Floor(d * 15) - 1);
      return colors[cIdx];
    }




    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool GetConsoleScreenBufferInfoEx(IntPtr handle, ref CONSOLE_SCREEN_BUFFER_INFO_EX consoleScreenBufferInfoEx);
    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool SetConsoleScreenBufferInfoEx(IntPtr handle, ref CONSOLE_SCREEN_BUFFER_INFO_EX consoleScreenBufferInfoEx);

    [StructLayout(LayoutKind.Sequential)]
    public struct CONSOLE_SCREEN_BUFFER_INFO_EX {
      public uint cbSize;  // 96
      public short dwSizeX;
      public short dwSizeY;
      public short dwCursorPositionX;
      public short dwCursorPositionY;
      public short wAttributes;
      public short srWindowLeft;
      public short srWindowTop;
      public short srWindowRight;
      public short srWindowBottom;
      public short dwMaximumWindowSizeX;
      public short dwMaximumWindowSizeY;

      public ushort wPopupAttributes;
      public bool bFullscreenSupported;

      public int Color0;
      public int Color1;
      public int Color2;
      public int Color3;

      public int Color4;
      public int Color5;
      public int Color6;
      public int Color7;

      public int Color8;
      public int Color9;
      public int ColorA;
      public int ColorB;

      public int ColorC;
      public int ColorD;
      public int ColorE;
      public int ColorF;
    }

    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern IntPtr CreateFile(
        string Filename,
        int DesiredAccess,
        int ShareMode,
        [In][MarshalAs(UnmanagedType.LPStruct)]SecurityAttributes SecAttr,
        int CreationDisposition,
        int FlagsAndAttributes,
        IntPtr TemplateFile);

    private const int GENERIC_READ = unchecked((int)0x80000000);
    private const int GENERIC_WRITE = 0x40000000;
    private const int FILE_SHARE_READ = 1;
    private const int FILE_SHARE_WRITE = 2;

    [DllImport("kernel32.dll")]
    private static extern bool CloseHandle(IntPtr handle);

    [StructLayout(LayoutKind.Sequential)]
    private class SecurityAttributes {
      public int nLength;
      public IntPtr lpSecurityDescriptor;
      public bool bInheritHandle;
    }
  }
}