using System;
using System.Runtime.InteropServices;

namespace DnD_Hra
{
    public static class FontManager
    {
        // Constant for TrueType font family
        private const uint TMPF_TRUETYPE = 4;

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct ConsoleFontEx
        {
            public int Index;
            public int SizeX, SizeY;
            public uint FontFamily;
            public uint Weight;
            public string FaceName;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct ConsoleFontInfo
        {
            public int nFont;
            public Coord dwFontSize;
        }

        [StructLayout(LayoutKind.Explicit)]
        private struct Coord
        {
            [FieldOffset(0)]
            public short X;
            [FieldOffset(2)]
            public short Y;
        }

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool GetCurrentConsoleFont(IntPtr hOut, bool bMaximumWindow, out ConsoleFontInfo lpConsoleCurrentFont);

        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool SetCurrentConsoleFontEx(IntPtr consoleOutput, bool maximumWindow, ConsoleFontEx consoleCurrentFontEx);

        [DllImport("kernel32.dll")]
        private static extern IntPtr GetStdHandle(int nStdHandle);

        public static bool SetFont(string fontName, int fontSize, int nStdHandle)
        {
            IntPtr consoleHandle = GetStdHandle(nStdHandle);

            ConsoleFontEx consoleFontEx = new ConsoleFontEx
            {
                Index = 0,
                SizeX = 8,
                SizeY = fontSize,
                FontFamily = TMPF_TRUETYPE,
                FaceName = fontName
            };

            bool success = SetCurrentConsoleFontEx(consoleHandle, false, consoleFontEx);

            if (!success)
            {
                int errorCode = Marshal.GetLastWin32Error();
                Console.WriteLine($"Failed to set console font. Error code: {errorCode}");
            }

            return success;
        }

        public static void ResetFont(IntPtr consoleHandle)
        {
            GetCurrentConsoleFont(consoleHandle, false, out ConsoleFontInfo consoleFontInfo);

            ConsoleFontEx consoleFontEx = new ConsoleFontEx
            {
                Index = consoleFontInfo.nFont,
                SizeX = consoleFontInfo.dwFontSize.X,
                SizeY = consoleFontInfo.dwFontSize.Y,
                FontFamily = TMPF_TRUETYPE,
                FaceName = "Consolas"
            };

            SetCurrentConsoleFontEx(consoleHandle, false, consoleFontEx);
        }
        public static void PrintStdHandles()
        {
            IntPtr stdInputHandle = GetStdHandle(-10);
            IntPtr stdOutputHandle = GetStdHandle(-11);
            IntPtr stdErrorHandle = GetStdHandle(-12);

            Console.WriteLine($"Standard input handle: {stdInputHandle}");
            Console.WriteLine($"Standard output handle: {stdOutputHandle}");
            Console.WriteLine($"Standard error handle: {stdErrorHandle}");
        }
    }
}