using System.Runtime.InteropServices;
using System.Drawing;

namespace anjianjingling.Native
{
    /// <summary>
    /// Win32 API 统一封装：SendInput、窗口、热键、消息。
    /// </summary>
    internal static class Win32
    {
        #region SendInput 结构与常量

        public const uint INPUT_MOUSE = 0;
        public const uint INPUT_KEYBOARD = 1;

        public const uint MOUSEEVENTF_MOVE = 0x0001;
        public const uint MOUSEEVENTF_LEFTDOWN = 0x0002;
        public const uint MOUSEEVENTF_LEFTUP = 0x0004;
        public const uint MOUSEEVENTF_RIGHTDOWN = 0x0008;
        public const uint MOUSEEVENTF_RIGHTUP = 0x0010;
        public const uint MOUSEEVENTF_MIDDLEDOWN = 0x0020;
        public const uint MOUSEEVENTF_MIDDLEUP = 0x0040;
        public const uint MOUSEEVENTF_WHEEL = 0x0800;
        public const uint MOUSEEVENTF_ABSOLUTE = 0x8000;
        public const uint MOUSEEVENTF_VIRTUALDESK = 0x4000;
        public const int WHEEL_DELTA = 120;

        public const uint KEYEVENTF_EXTENDEDKEY = 0x0001;
        public const uint KEYEVENTF_KEYUP = 0x0002;
        public const uint KEYEVENTF_UNICODE = 0x0004;
        public const uint KEYEVENTF_SCANCODE = 0x0008;

        public const int SM_CXVIRTUALSCREEN = 78;
        public const int SM_CYVIRTUALSCREEN = 79;
        public const int SM_XVIRTUALSCREEN = 76;
        public const int SM_YVIRTUALSCREEN = 77;

        [StructLayout(LayoutKind.Sequential)]
        public struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public uint mouseData;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public uint time;
            public IntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct INPUTUNION
        {
            [FieldOffset(0)] public MOUSEINPUT mi;
            [FieldOffset(0)] public KEYBDINPUT ki;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct INPUT
        {
            public uint type;
            public INPUTUNION u;
        }

        [DllImport("user32.dll", SetLastError = true)]
        public static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

        [DllImport("user32.dll")]
        public static extern bool GetCursorPos(out Point lpPoint);

        [DllImport("user32.dll")]
        public static extern bool SetCursorPos(int x, int y);

        [DllImport("user32.dll")]
        public static extern int GetSystemMetrics(int nIndex);

        [DllImport("user32.dll")]
        public static extern uint MapVirtualKey(uint uCode, uint uMapType);
        public const uint MAPVK_VK_TO_VSC = 0;

        #endregion

        #region 热键

        public const int WM_HOTKEY = 0x0312;
        public const uint MOD_ALT = 0x0001;
        public const uint MOD_CONTROL = 0x0002;
        public const uint MOD_SHIFT = 0x0004;
        public const uint MOD_NOREPEAT = 0x4000;

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

        [DllImport("user32.dll")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        #endregion

        #region 窗口

        public delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

        [DllImport("user32.dll")]
        public static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern int GetWindowText(IntPtr hWnd, System.Text.StringBuilder lpString, int nMaxCount);

        [DllImport("user32.dll")]
        public static extern int GetWindowTextLength(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsWindowVisible(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);

        [DllImport("user32.dll")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        [DllImport("user32.dll")]
        public static extern bool IsIconic(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        [DllImport("user32.dll")]
        public static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);

        [DllImport("kernel32.dll")]
        public static extern uint GetCurrentThreadId();

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string? lpClassName, string lpWindowName);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll")]
        public static extern bool ScreenToClient(IntPtr hWnd, ref Point lpPoint);

        [DllImport("user32.dll")]
        public static extern bool PrintWindow(IntPtr hWnd, IntPtr hdcBlt, uint nFlags);
        public const uint PW_RENDERFULLCONTENT = 2;

        public const int SW_RESTORE = 9;
        public const int SW_SHOW = 5;

        // 窗口消息
        public const uint WM_LBUTTONDOWN = 0x0201;
        public const uint WM_LBUTTONUP = 0x0202;
        public const uint WM_RBUTTONDOWN = 0x0204;
        public const uint WM_RBUTTONUP = 0x0205;
        public const uint WM_KEYDOWN = 0x0100;
        public const uint WM_KEYUP = 0x0101;
        public const uint WM_CHAR = 0x0102;
        public const IntPtr MK_LBUTTON = 0x0001;

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

        public static IntPtr MakeLParam(int low, int high)
            => (IntPtr)((high << 16) | (low & 0xFFFF));

        #endregion
    }
}