using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Input;
using Vinno.FIS.Sonopost.Common;
using Vinno.FIS.Sonopost.Managers.Interfaces;
using Vinno.FIS.Sonopost.Settings;
using Vinno.IUS.Common.Log;

namespace Vinno.FIS.Sonopost.Managers
{
    internal class KeyBoardListenManager : SonopostManager, IKeyBoardListenManager
    {
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private const int WM_KEYUP = 0x0101;
        private bool _isLeftKeyDown;
        private bool _isRightKeyDown;

        private bool _isStarted;

        // 声明全局钩子句柄
        private IntPtr _keyboardHookID = IntPtr.Zero;

        // 键盘处理委托实例
        private LowLevelKeyboardProc _keyboardProc;

        // 导入SetWindowsHookEx函数
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        // 导入UnhookWindowsHookEx函数
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        // 导入CallNextHookEx函数
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        // 声明KeyboardProc委托类型
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        public EnumKeyboardKey LeftKey { get; private set; }

        public EnumKeyboardKey RightKey { get; private set; }

        public event EventHandler LeftKeyPressedEvent;

        public event EventHandler RightKeyPressedEvent;

        public KeyBoardListenManager()
        {
            _keyboardProc = KeyboardHookCallback;
            _keyboardHookID = SetKeyboardHook(_keyboardProc);
        }

        public void StartKeyBoardListen()
        {
            if (!_isStarted)
            {
                LeftKey = SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleLeftKeyForKeyBoard;
                RightKey = SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleRightKeyForKeyBoard;
                _isStarted = true;
                Logger.WriteLineInfo($"Start To Listen {LeftKey} & {RightKey}");
            }
            else
            {
                if (LeftKey != SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleLeftKeyForKeyBoard || RightKey != SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleRightKeyForKeyBoard)
                {
                    LeftKey = SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleLeftKeyForKeyBoard;
                    RightKey = SonopostUserDefinedSettings.Instance.CaptureSetting.FootToggleRightKeyForKeyBoard;
                    Logger.WriteLineInfo($"Start To Listen {LeftKey} & {RightKey}");
                }
            }
        }

        private IntPtr SetKeyboardHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        public void StopKeyBoardListen()
        {
            if (!_isStarted)
            {
                return;
            }
            _isStarted = false;
            Logger.WriteLineInfo($"Stop KeyBoard Listen");
        }

        public override void DoDispose()
        {
            try
            {
                StopKeyBoardListen();
                UnhookWindowsHookEx(_keyboardHookID);
            }
            catch (Exception ex)
            {
                Logger.WriteLineError($"KeyBoardListenManager DoDispose Error:{ex}");
            }
            base.DoDispose();
        }

        private IntPtr KeyboardHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            try
            {
                if (nCode >= 0 && _isStarted)
                {
                    if (wParam == (IntPtr)WM_KEYDOWN)
                    {
                        int vkCode = Marshal.ReadInt32(lParam);
                        var pressedKey = KeyInterop.KeyFromVirtualKey(vkCode);
                        if (pressedKey.ToString() == LeftKey.ToString() && !_isLeftKeyDown)
                        {
                            Logger.WriteLineWarn($"LeftKey {pressedKey} Pressed");
                            _isLeftKeyDown = true;
                            LeftKeyPressedEvent?.Invoke(this, EventArgs.Empty);
                        }
                        else if (pressedKey.ToString() == RightKey.ToString() && !_isRightKeyDown)
                        {
                            Logger.WriteLineWarn($"RightKey {pressedKey} Pressed");
                            _isRightKeyDown = true;
                            RightKeyPressedEvent?.Invoke(this, EventArgs.Empty);
                        }
                    }
                    else if (wParam == (IntPtr)WM_KEYUP)
                    {
                        int vkCode = Marshal.ReadInt32(lParam);
                        var pressedKey = KeyInterop.KeyFromVirtualKey(vkCode);
                        if (pressedKey.ToString() == LeftKey.ToString())
                        {
                            _isLeftKeyDown = false;
                        }
                        else if (pressedKey.ToString() == RightKey.ToString())
                        {
                            _isRightKeyDown = false;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.WriteLineError($"KeyboardHookCallback Error:{ex}");
            }
            return CallNextHookEx(_keyboardHookID, nCode, wParam, lParam);
        }
    }
}