using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;

namespace AnyConsole
{
    public partial class ExtendedConsole
    {
        const int MONITOR_DEFAULTTOPRIMARY = 1;
        const uint SW_RESTORE = 9;
        const int STD_INPUT_HANDLE = -10;
        const int STD_OUTPUT_HANDLE = -11;
        const int STD_ERROR_HANDLE = -12;
        const uint MOUSE_BUTTON = 0x0000;
        const uint MOUSE_MOVED = 0x0001;
        const ushort KEYBOARD_EVENT = 0x0001;
        const ushort MOUSE_EVENT = 0x0002;
        const uint MOUSE_WHEELED = 0x0004;
        const uint MOUSE_HWHEELED = 0x0008;
        const uint MOUSE_WHEELUP = 0xFF880000;
        const uint MOUSE_WHEELDOWN = 0x00780000;
        const uint ENABLE_QUICK_EDIT = 0x0040;
        const uint ENABLE_WINDOW_INPUT = 0x0008;
        const uint ENABLE_MOUSE_INPUT = 0x0010;
        const uint KEY_PRESSED = 0x8000;

        [DllImport("kernel32.dll")]
        static extern IntPtr GetConsoleWindow();

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr GetStdHandle(int nStdHandle);

        [DllImport("user32.dll")]
        static extern IntPtr MonitorFromWindow(IntPtr hwnd, uint dwFlags);

        [DllImport("user32.dll")]
        static extern bool GetMonitorInfo(IntPtr hMonitor, ref MONITORINFO lpmi);

        [DllImport("user32.dll", SetLastError = true)]
        static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);

        [DllImport("user32.dll", SetLastError = true)]
        static extern bool SetWindowPlacement(IntPtr hWnd, [In] ref WINDOWPLACEMENT lpwndpl);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("kernel32.dll", EntryPoint = "ReadConsoleInputW", CharSet = CharSet.Unicode)]
        static extern bool ReadConsoleInput(IntPtr hConsoleInput, [Out] INPUT_RECORD[] lpBuffer, uint nLength, out uint lpNumberOfEventsRead);

        [DllImport("USER32.dll")]
        static extern short GetKeyState(VirtualKeyStates nVirtKey);

        [DllImport("kernel32.dll")]
        static extern bool GetNumberOfConsoleInputEvents(IntPtr hConsoleInput, out uint lpNumberOfEvents);

        [DllImport("kernel32.dll")]
        static extern bool GetConsoleMode(IntPtr hConsoleInput, out uint lpMode);

        [DllImport("kernel32.dll")]
        static extern bool SetConsoleMode(IntPtr hConsoleInput, uint dwMode);

        private void EnableConsoleInputs(IntPtr hWnd)
        {
            var consoleMode = 0U;
            if (GetConsoleMode(hWnd, out consoleMode))
            {
                consoleMode |= ENABLE_MOUSE_INPUT;
                consoleMode |= ENABLE_WINDOW_INPUT;
                SetConsoleMode(hWnd, consoleMode);
            }
        }

        /// <summary>
        /// True if quick edit mode is enabled
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        private bool IsQuickEditModeEnabled(IntPtr hWnd)
        {
            var consoleMode = 0U;
            GetConsoleMode(hWnd, out consoleMode);
            return (consoleMode & ENABLE_QUICK_EDIT) == ENABLE_QUICK_EDIT;
        }

        /// <summary>
        /// Disable Quick Edit mode
        /// </summary>
        /// <param name="hWnd"></param>
        private void DisableQuickEditMode(IntPtr hWnd)
        {
            var consoleMode = 0U;
            if (GetConsoleMode(hWnd, out consoleMode))
            {
                consoleMode &= ~ENABLE_QUICK_EDIT;
                SetConsoleMode(hWnd, consoleMode);
            }
        }

        /// <summary>
        /// Enable Quick Edit mode
        /// </summary>
        /// <param name="hWnd"></param>
        private void EnableQuickEditMode(IntPtr hWnd)
        {
            var consoleMode = 0U;
            if (GetConsoleMode(hWnd, out consoleMode))
            {
                consoleMode &= ENABLE_QUICK_EDIT;
                SetConsoleMode(hWnd, consoleMode);
            }
        }

        [DllImport("kernel32")]
        public static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEM_INFO
        {
            public uint dwOemId;
            public uint dwPageSize;
            public uint lpMinimumApplicationAddress;
            public uint lpMaximumApplicationAddress;
            public uint dwActiveProcessorMask;
            public uint dwNumberOfProcessors;
            public uint dwProcessorType;
            public uint dwAllocationGranularity;
            public uint dwProcessorLevel;
            public uint dwProcessorRevision;
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct INPUT_RECORD
        {
            [FieldOffset(0)]
            public ushort EventType;
            [FieldOffset(4)]
            public KEY_EVENT_RECORD KeyEvent;
            [FieldOffset(4)]
            public MOUSE_EVENT_RECORD MouseEvent;
            [FieldOffset(4)]
            public WINDOW_BUFFER_SIZE_RECORD WindowBufferSizeEvent;
            [FieldOffset(4)]
            public MENU_EVENT_RECORD MenuEvent;
            [FieldOffset(4)]
            public FOCUS_EVENT_RECORD FocusEvent;
        };

        [StructLayout(LayoutKind.Explicit, CharSet = CharSet.Unicode)]
        public struct KEY_EVENT_RECORD
        {
            [FieldOffset(0), MarshalAs(UnmanagedType.Bool)]
            public bool bKeyDown;
            [FieldOffset(4), MarshalAs(UnmanagedType.U2)]
            public ushort wRepeatCount;
            [FieldOffset(6), MarshalAs(UnmanagedType.U2)]
            public ushort wVirtualKeyCode;
            [FieldOffset(8), MarshalAs(UnmanagedType.U2)]
            public ushort wVirtualScanCode;
            [FieldOffset(10)]
            public char UnicodeChar;
            [FieldOffset(12), MarshalAs(UnmanagedType.U4)]
            public ControlKeyState dwControlKeyState;
        }

        public struct WINDOW_BUFFER_SIZE_RECORD
        {
            public POINT dwSize;

            public WINDOW_BUFFER_SIZE_RECORD(short x, short y)
            {
                dwSize = new POINT(x, y);
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MENU_EVENT_RECORD
        {
            public uint dwCommandId;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct FOCUS_EVENT_RECORD
        {
            public uint bSetFocus;
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct MOUSE_EVENT_RECORD
        {
            [FieldOffset(0)]
            public POINT dwMousePosition;
            [FieldOffset(4)]
            public uint dwButtonState;
            [FieldOffset(8)]
            public ControlKeyState dwControlKeyState;
            [FieldOffset(12)]
            public uint dwEventFlags;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MONITORINFO
        {
            public uint cbSize;
            public RECT rcMonitor;
            public RECT rcWork;
            public uint dwFlags;
            public static MONITORINFO Default
            {
                get { var inst = new MONITORINFO(); inst.cbSize = (uint)Marshal.SizeOf(inst); return inst; }
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left, Top, Right, Bottom;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x, y;
            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct WINDOWPLACEMENT
        {
            public uint Length;
            public uint Flags;
            public uint ShowCmd;
            public POINT MinPosition;
            public POINT MaxPosition;
            public RECT NormalPosition;
            public static WINDOWPLACEMENT Default
            {
                get
                {
                    var instance = new WINDOWPLACEMENT();
                    instance.Length = (uint)Marshal.SizeOf(instance);
                    return instance;
                }
            }
        }

        enum VirtualKeyStates : int
        {
            VK_LBUTTON = 0x01,
            VK_RBUTTON = 0x02,
            VK_CANCEL = 0x03,
            VK_MBUTTON = 0x04,
            //
            VK_XBUTTON1 = 0x05,
            VK_XBUTTON2 = 0x06,
            //
            VK_BACK = 0x08,
            VK_TAB = 0x09,
            //
            VK_CLEAR = 0x0C,
            VK_RETURN = 0x0D,
            //
            VK_SHIFT = 0x10,
            VK_CONTROL = 0x11,
            VK_MENU = 0x12,
            VK_PAUSE = 0x13,
            VK_CAPITAL = 0x14,
            //
            VK_KANA = 0x15,
            VK_HANGEUL = 0x15,  /* old name - should be here for compatibility */
            VK_HANGUL = 0x15,
            VK_JUNJA = 0x17,
            VK_FINAL = 0x18,
            VK_HANJA = 0x19,
            VK_KANJI = 0x19,
            //
            VK_ESCAPE = 0x1B,
            //
            VK_CONVERT = 0x1C,
            VK_NONCONVERT = 0x1D,
            VK_ACCEPT = 0x1E,
            VK_MODECHANGE = 0x1F,
            //
            VK_SPACE = 0x20,
            VK_PRIOR = 0x21,
            VK_NEXT = 0x22,
            VK_END = 0x23,
            VK_HOME = 0x24,
            VK_LEFT = 0x25,
            VK_UP = 0x26,
            VK_RIGHT = 0x27,
            VK_DOWN = 0x28,
            VK_SELECT = 0x29,
            VK_PRINT = 0x2A,
            VK_EXECUTE = 0x2B,
            VK_SNAPSHOT = 0x2C,
            VK_INSERT = 0x2D,
            VK_DELETE = 0x2E,
            VK_HELP = 0x2F,
            //
            VK_LWIN = 0x5B,
            VK_RWIN = 0x5C,
            VK_APPS = 0x5D,
            //
            VK_SLEEP = 0x5F,
            //
            VK_NUMPAD0 = 0x60,
            VK_NUMPAD1 = 0x61,
            VK_NUMPAD2 = 0x62,
            VK_NUMPAD3 = 0x63,
            VK_NUMPAD4 = 0x64,
            VK_NUMPAD5 = 0x65,
            VK_NUMPAD6 = 0x66,
            VK_NUMPAD7 = 0x67,
            VK_NUMPAD8 = 0x68,
            VK_NUMPAD9 = 0x69,
            VK_MULTIPLY = 0x6A,
            VK_ADD = 0x6B,
            VK_SEPARATOR = 0x6C,
            VK_SUBTRACT = 0x6D,
            VK_DECIMAL = 0x6E,
            VK_DIVIDE = 0x6F,
            VK_F1 = 0x70,
            VK_F2 = 0x71,
            VK_F3 = 0x72,
            VK_F4 = 0x73,
            VK_F5 = 0x74,
            VK_F6 = 0x75,
            VK_F7 = 0x76,
            VK_F8 = 0x77,
            VK_F9 = 0x78,
            VK_F10 = 0x79,
            VK_F11 = 0x7A,
            VK_F12 = 0x7B,
            VK_F13 = 0x7C,
            VK_F14 = 0x7D,
            VK_F15 = 0x7E,
            VK_F16 = 0x7F,
            VK_F17 = 0x80,
            VK_F18 = 0x81,
            VK_F19 = 0x82,
            VK_F20 = 0x83,
            VK_F21 = 0x84,
            VK_F22 = 0x85,
            VK_F23 = 0x86,
            VK_F24 = 0x87,
            //
            VK_NUMLOCK = 0x90,
            VK_SCROLL = 0x91,
            //
            VK_OEM_NEC_EQUAL = 0x92,   // '=' key on numpad
                                       //
            VK_OEM_FJ_JISHO = 0x92,   // 'Dictionary' key
            VK_OEM_FJ_MASSHOU = 0x93,   // 'Unregister word' key
            VK_OEM_FJ_TOUROKU = 0x94,   // 'Register word' key
            VK_OEM_FJ_LOYA = 0x95,   // 'Left OYAYUBI' key
            VK_OEM_FJ_ROYA = 0x96,   // 'Right OYAYUBI' key
                                     //
            VK_LSHIFT = 0xA0,
            VK_RSHIFT = 0xA1,
            VK_LCONTROL = 0xA2,
            VK_RCONTROL = 0xA3,
            VK_LMENU = 0xA4,
            VK_RMENU = 0xA5,
            //
            VK_BROWSER_BACK = 0xA6,
            VK_BROWSER_FORWARD = 0xA7,
            VK_BROWSER_REFRESH = 0xA8,
            VK_BROWSER_STOP = 0xA9,
            VK_BROWSER_SEARCH = 0xAA,
            VK_BROWSER_FAVORITES = 0xAB,
            VK_BROWSER_HOME = 0xAC,
            //
            VK_VOLUME_MUTE = 0xAD,
            VK_VOLUME_DOWN = 0xAE,
            VK_VOLUME_UP = 0xAF,
            VK_MEDIA_NEXT_TRACK = 0xB0,
            VK_MEDIA_PREV_TRACK = 0xB1,
            VK_MEDIA_STOP = 0xB2,
            VK_MEDIA_PLAY_PAUSE = 0xB3,
            VK_LAUNCH_MAIL = 0xB4,
            VK_LAUNCH_MEDIA_SELECT = 0xB5,
            VK_LAUNCH_APP1 = 0xB6,
            VK_LAUNCH_APP2 = 0xB7,
            //
            VK_OEM_1 = 0xBA,   // ';:' for US
            VK_OEM_PLUS = 0xBB,   // '+' any country
            VK_OEM_COMMA = 0xBC,   // ',' any country
            VK_OEM_MINUS = 0xBD,   // '-' any country
            VK_OEM_PERIOD = 0xBE,   // '.' any country
            VK_OEM_2 = 0xBF,   // '/?' for US
            VK_OEM_3 = 0xC0,   // '`~' for US
                               //
            VK_OEM_4 = 0xDB,  //  '[{' for US
            VK_OEM_5 = 0xDC,  //  '\|' for US
            VK_OEM_6 = 0xDD,  //  ']}' for US
            VK_OEM_7 = 0xDE,  //  ''"' for US
            VK_OEM_8 = 0xDF,
            //
            VK_OEM_AX = 0xE1,  //  'AX' key on Japanese AX kbd
            VK_OEM_102 = 0xE2,  //  "<>" or "\|" on RT 102-key kbd.
            VK_ICO_HELP = 0xE3,  //  Help key on ICO
            VK_ICO_00 = 0xE4,  //  00 key on ICO
                               //
            VK_PROCESSKEY = 0xE5,
            //
            VK_ICO_CLEAR = 0xE6,
            //
            VK_PACKET = 0xE7,
            //
            VK_OEM_RESET = 0xE9,
            VK_OEM_JUMP = 0xEA,
            VK_OEM_PA1 = 0xEB,
            VK_OEM_PA2 = 0xEC,
            VK_OEM_PA3 = 0xED,
            VK_OEM_WSCTRL = 0xEE,
            VK_OEM_CUSEL = 0xEF,
            VK_OEM_ATTN = 0xF0,
            VK_OEM_FINISH = 0xF1,
            VK_OEM_COPY = 0xF2,
            VK_OEM_AUTO = 0xF3,
            VK_OEM_ENLW = 0xF4,
            VK_OEM_BACKTAB = 0xF5,
            //
            VK_ATTN = 0xF6,
            VK_CRSEL = 0xF7,
            VK_EXSEL = 0xF8,
            VK_EREOF = 0xF9,
            VK_PLAY = 0xFA,
            VK_ZOOM = 0xFB,
            VK_NONAME = 0xFC,
            VK_PA1 = 0xFD,
            VK_OEM_CLEAR = 0xFE
        }

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        extern static bool GetCurrentConsoleFontEx(IntPtr hConsoleOutput, bool bMaximumWindow, ref CONSOLE_FONT_INFO_EX lpConsoleCurrentFont);

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

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        private struct CONSOLE_FONT_INFO_EX
        {
            public uint cbSize;
            public uint nFont;
            public COORD dwFontSize;
            public int FontFamily;
            public int FontWeight;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = LF_FACESIZE)]
            public string FaceName;
        }

        [DllImport("gdi32.dll")]
        private static extern uint GetFontUnicodeRanges(IntPtr hdc, IntPtr lpgs);

        [DllImport("gdi32.dll")]
        private extern static IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

        public struct FontRange
        {
            public ushort Low;
            public ushort High;
            public override string ToString() => $"{Low} - {High} ({Low:X0} - {High:X0})";
        }

        private enum StdHandle
        {
            OutputHandle = -11
        }

        private const int TMPF_TRUETYPE = 4;
        private const int LF_FACESIZE = 32;

        [DllImport("kernel32")]
        private static extern IntPtr GetStdHandle(StdHandle index);

        [StructLayout(LayoutKind.Sequential)]
        public struct COORD
        {
            public short X;
            public short Y;

            public COORD(short x, short y)
            {
                X = x;
                Y = y;
            }
        }

        public struct FontCapabilities
        {
            public string FontName;
            public short XSize;
            public short YSize;
            public int Weight;
            public bool SupportsDesiredUnicodeRanges;
        }

        public static void SetCurrentFont(string fontName, short? xSize = null, short? ySize = null, int? weight = null)
        {
            var handle = GetStdHandle(StdHandle.OutputHandle);
            var info = GetCurrentFontInfo(handle);
            var newInfo = new CONSOLE_FONT_INFO_EX();
            newInfo.cbSize = (uint)Marshal.SizeOf(newInfo);
            newInfo.FontFamily = TMPF_TRUETYPE;
            newInfo.FaceName = fontName;
            newInfo.dwFontSize.X = xSize ?? info.dwFontSize.X;
            newInfo.dwFontSize.Y = ySize ?? info.dwFontSize.Y;
            newInfo.FontWeight = weight ?? info.FontWeight;
            SetCurrentConsoleFontEx(handle, false, ref newInfo);
        }

        private static CONSOLE_FONT_INFO_EX GetCurrentFontInfo(IntPtr handle)
        {
            var info = new CONSOLE_FONT_INFO_EX();
            info.cbSize = (uint)Marshal.SizeOf(info);
            GetCurrentConsoleFontEx(handle, false, ref info);
            return info;
        }

        public static FontCapabilities GetCurrentFont()
        {
            var handle = GetStdHandle(StdHandle.OutputHandle);
            var info = GetCurrentFontInfo(handle);
            var isTrueType = (info.FontFamily & TMPF_TRUETYPE) == TMPF_TRUETYPE;
            var fontName = info.FaceName;
            var font = new Font(fontName, 10);
            var ranges = GetUnicodeRangesForFont(font);
            // ‭10240‬, ‭10495‬
            var min = 0x2801;
            var max = 0x28FF;
            // var test = CheckIfCharInFont('•', font);
            // int unicodeValue = Convert.ToUInt16('\u2801');
            var supportsDesiredUnicodeRanges = ranges.Any(x => (x.Low >= min && x.High <= min) && (x.Low <= max && x.High >= max));

            return new FontCapabilities {
                FontName = fontName,
                SupportsDesiredUnicodeRanges = supportsDesiredUnicodeRanges
            };
        }

        private static bool CheckIfCharacterInFont(char character, Font font)
        {
            var intval = Convert.ToUInt16(character);
            var ranges = GetUnicodeRangesForFont(font);
            var isCharacterPresent = false;
            foreach (var range in ranges)
            {
                if (intval >= range.Low && intval <= range.High)
                {
                    isCharacterPresent = true;
                    break;
                }
            }
            return isCharacterPresent;
        }

        private static List<FontRange> GetUnicodeRangesForFont(Font font)
        {
            var g = Graphics.FromHwnd(IntPtr.Zero);
            var hdc = g.GetHdc();
            var hFont = font.ToHfont();
            var old = SelectObject(hdc, hFont);
            var size = GetFontUnicodeRanges(hdc, IntPtr.Zero);
            var glyphSet = Marshal.AllocHGlobal((int)size);
            GetFontUnicodeRanges(hdc, glyphSet);
            var fontRanges = new List<FontRange>();
            var count = Marshal.ReadInt32(glyphSet, 12);
            for (var i = 0; i < count; i++)
            {
                var range = new FontRange();
                range.Low = (UInt16)Marshal.ReadInt16(glyphSet, 16 + i * 4);
                range.High = (UInt16)(range.Low + Marshal.ReadInt16(glyphSet, 18 + i * 4) - 1);
                fontRanges.Add(range);
            }
            SelectObject(hdc, old);
            Marshal.FreeHGlobal(glyphSet);
            g.ReleaseHdc(hdc);
            g.Dispose();
            return fontRanges;
        }
    }
}
