using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading.Tasks;

namespace CCDCount.DLL.Tools
{
    public static class OnScreenKeyboard
    {
        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

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

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

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

        const int SW_SHOW = 5;
        const int SW_RESTORE = 9;
        const int SW_HIDE = 0;

        public static async void Show()
        {
            // 首先确保没有旧进程
            KillTabTipProcess();

            // 等待进程完全终止
            await Task.Delay(300);

            // 启动新实例
            if (StartNewInstance())
            {
                // 等待窗口出现
                await Task.Delay(500);
                IntPtr keyboardWnd = FindWindow("IPTip_Main_Window", null);

                if (keyboardWnd != IntPtr.Zero)
                {
                    ShowWindow(keyboardWnd, SW_RESTORE);
                    SetForegroundWindow(keyboardWnd);
                }
            }
        }

        private static async Task ShowKeyboardAsync()
        {
            // 尝试查找已运行的键盘实例
            IntPtr keyboardWnd = FindWindow("IPTip_Main_Window", null);

            if (keyboardWnd != IntPtr.Zero && IsWindowVisible(keyboardWnd))
            {
                // 键盘已经在显示中
                SetForegroundWindow(keyboardWnd);
                return;
            }

            // 尝试使用COM接口
            if (TryShowWithCom())
                return;

            // 启动新实例
            if (StartNewInstance())
            {
                // 等待窗口出现
                await Task.Delay(300);
                keyboardWnd = FindWindow("IPTip_Main_Window", null);
            }

            // 显示窗口
            if (keyboardWnd != IntPtr.Zero)
            {
                ShowWindow(keyboardWnd, SW_RESTORE);
                SetForegroundWindow(keyboardWnd);
            }
        }

        private static bool TryShowWithCom()
        {
            try
            {
                Type type = Type.GetTypeFromProgID("TabTip.TabTip");
                if (type != null)
                {
                    object instance = Activator.CreateInstance(type);
                    type.InvokeMember("Show", System.Reflection.BindingFlags.InvokeMethod, null, instance, null);
                    Marshal.ReleaseComObject(instance);
                    return true;
                }
            }
            catch
            {
                // COM方法失败，继续尝试其他方法
            }
            return false;
        }

        private static bool StartNewInstance()
        {
            try
            {
                string[] keyboardPaths = {
                @"C:\Program Files\Common Files\Microsoft Shared\ink\TabTip.exe",
                @"C:\Program Files (x86)\Common Files\Microsoft Shared\ink\TabTip.exe"
            };

                foreach (string path in keyboardPaths)
                {
                    if (System.IO.File.Exists(path))
                    {
                        Process.Start(new ProcessStartInfo
                        {
                            FileName = path,
                            UseShellExecute = true
                        });
                        return true;
                    }
                }
            }
            catch
            {
                // 启动失败
            }
            return false;
        }

        public static void Hide()
        {
            IntPtr keyboardWnd = FindWindow("IPTip_Main_Window", null);
            if (keyboardWnd != IntPtr.Zero)
            {
                ShowWindow(keyboardWnd, SW_HIDE);
            }
            KillTabTipProcess();
        }

        public static void KillTabTipProcess()
        {
            try
            {
                Process[] processes = Process.GetProcessesByName("TabTip");
                foreach (Process process in processes)
                {
                    process.Kill();
                    process.WaitForExit();
                }
            }
            catch
            {
                // 忽略异常
            }
        }
    }
}