using UnityEngine;
using System.Runtime.InteropServices;



public enum KeyType
{
    None,

    // 数字
    Digit0, Digit1, Digit2, Digit3, Digit4,
    Digit5, Digit6, Digit7, Digit8, Digit9,

    // 字母
    A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z,

    // 功能键
    F1, F2, F3, F4, F5, F6, F7, F8, F9, F10,

    // 特殊键
    Enter,
    Backspace,
    Space,
    Plus,
    Minus,

    // 方向键
    ArrowUp, ArrowDown, ArrowLeft, ArrowRight,
    NumpadDot,
    上移,下移,上翻,下翻,
   
}


public static class KeyboardSimulator
{
    [DllImport("user32.dll")]
    private static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

    private const int INPUT_KEYBOARD = 1;
    private const uint KEYEVENTF_KEYUP = 0x0002;

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

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

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

    public static ushort GetVK(KeyType type)
    {
        switch (type)
        {
            // 数字
            case KeyType.Digit0: return 0x30;
            case KeyType.Digit1: return 0x31;
            case KeyType.Digit2: return 0x32;
            case KeyType.Digit3: return 0x33;
            case KeyType.Digit4: return 0x34;
            case KeyType.Digit5: return 0x35;
            case KeyType.Digit6: return 0x36;
            case KeyType.Digit7: return 0x37;
            case KeyType.Digit8: return 0x38;
            case KeyType.Digit9: return 0x39;

            // F1-F10
            case KeyType.F1: return 0x70;
            case KeyType.F2: return 0x71;
            case KeyType.F3: return 0x72;
            case KeyType.F4: return 0x73;
            case KeyType.F5: return 0x74;
            case KeyType.F6: return 0x75;
            case KeyType.F7: return 0x76;
            case KeyType.F8: return 0x77;
            case KeyType.F9: return 0x78;
            case KeyType.F10: return 0x79;

            // 特殊键
            case KeyType.Enter: return 0x0D;
            case KeyType.Backspace: return 0x08;
            case KeyType.Space: return 0x20;
            case KeyType.Minus: return 0xBD;
            case KeyType.Plus: return 0xBB;

            // 方向键
            case KeyType.ArrowUp: return 0x26;
            case KeyType.ArrowDown: return 0x28;
            case KeyType.ArrowLeft: return 0x25;
            case KeyType.ArrowRight: return 0x27;

            // 字母
            default:
                if (type >= KeyType.A && type <= KeyType.Z)
                    return (ushort)((int)type - (int)KeyType.A + 0x41);
                break;
        }

        return 0;
    }

    public static void PressKey(KeyType type)
    {
        ushort vk = GetVK(type);
        if (vk == 0) return;

        // 特殊处理加号（Shift + =）
        if (type == KeyType.Plus)
        {
            SendKeyDown(0x10); // Shift
            SendKeyPress(0xBB); // =
            SendKeyUp(0x10);
            return;
        }

        SendKeyPress(vk);
    }

    private static void SendKeyPress(ushort vk)
    {
        SendKeyDown(vk);
        SendKeyUp(vk);
    }

    private static void SendKeyDown(ushort vk)
    {
        INPUT[] inputs = new INPUT[1];
        inputs[0].type = INPUT_KEYBOARD;
        inputs[0].u.ki.wVk = vk;
        inputs[0].u.ki.dwFlags = 0;
        SendInput(1, inputs, Marshal.SizeOf(typeof(INPUT)));
    }

    private static void SendKeyUp(ushort vk)
    {
        INPUT[] inputs = new INPUT[1];
        inputs[0].type = INPUT_KEYBOARD;
        inputs[0].u.ki.wVk = vk;
        inputs[0].u.ki.dwFlags = KEYEVENTF_KEYUP;
        SendInput(1, inputs, Marshal.SizeOf(typeof(INPUT)));
    }
}