using System.Runtime.InteropServices;

namespace SinMaiLauncher.Interops;

internal static class ConsoleInterops
{
    private static class NativeConsole
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool AllocConsole();

        [DllImport("kernel32.dll")]
        public static extern nint GetStdHandle(int nStdHandle);

        [DllImport("kernel32.dll")]
        public static extern bool SetConsoleMode(nint hConsoleHandle, int dwMode);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern nint GetConsoleWindow();

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool AttachConsole(uint dwProcessId);

        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
        public static extern bool FreeConsole();

        [DllImport("kernel32.dll")]
        public static extern bool SetConsoleCtrlHandler(ConsoleCtrlDelegate? HandlerRoutine, bool Add);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool GenerateConsoleCtrlEvent(ConsoleCtrlEvent ctrlEvent, uint processGroupId);

        public delegate bool ConsoleCtrlDelegate(uint ctrlType);

        // 控制台控制事件类型
        public enum ConsoleCtrlEvent
        {
            CTRL_C_EVENT = 0,
            CTRL_BREAK_EVENT = 1
        }

        public const int STD_INPUT_HANDLE = -10;
        public const int ENABLE_QUICK_EDIT_MODE = 0x0040;
        public const int ENABLE_EXTENDED_FLAGS = 0x0080;
    }


    public static class ExternalProcess
    {
        public static IntPtr? GetConsoleWindow(uint pid)
        {
            if (NativeConsole.AttachConsole(pid) == false) return null;
            var handle = NativeConsole.GetConsoleWindow();
            return handle;
        }

        public static bool DisableQuickEdit(uint pid)
        {
            if (NativeConsole.AttachConsole(pid) == false) return false;
            nint handle = NativeConsole.GetStdHandle(NativeConsole.STD_INPUT_HANDLE);

            // 禁用快速编辑模式
            int mode = NativeConsole.ENABLE_EXTENDED_FLAGS;
            return NativeConsole.SetConsoleMode(handle, mode);
        }

        public enum ResultOfSendCtrlC
        {
            Success = 0,
            AttachConsoleFailed = 1,
            GenerateCtrlEventFailed = 2
        }

        public static ResultOfSendCtrlC SendCtrlC(uint processId)
        {
            // 尝试附加到指定进程的控制台
            if (!NativeConsole.AttachConsole(processId)) return ResultOfSendCtrlC.AttachConsoleFailed;

            // 设置控制处理程序以避免自己进程接收到信号
            NativeConsole.SetConsoleCtrlHandler(null, true);

            // 发送CTRL_C_EVENT
            if (!NativeConsole.GenerateConsoleCtrlEvent(NativeConsole.ConsoleCtrlEvent.CTRL_C_EVENT, 0))
            {
                return ResultOfSendCtrlC.GenerateCtrlEventFailed;
            }

            // 释放控制台
            NativeConsole.FreeConsole();

            // 如果没有异常发生，退出代码为Success
            return ResultOfSendCtrlC.Success;
        }
    }

    public static class CurrentProcess
    {
        public static void ConsoleAllocate() => NativeConsole.AllocConsole();

        public static void ConsoleDisableQuickEdit()
        {
            nint handle = NativeConsole.GetStdHandle(NativeConsole.STD_INPUT_HANDLE);

            // 禁用快速编辑模式
            int mode = NativeConsole.ENABLE_EXTENDED_FLAGS;
            NativeConsole.SetConsoleMode(handle, mode);
        }

        public static void ConsoleWindowSetParent(Control container)
        {
            var consoleHandle = NativeConsole.GetConsoleWindow();

            // 将控制台窗口设置为 Panel 的子窗口
            WindowInterops.SetParent(consoleHandle, container.Handle);

            // 修改控制台窗口样式，去掉边框
            WindowInterops.RemoveBorderVisible(consoleHandle);
        }

        public static void ConsoleWindowFill(Control container)
        {
            WindowInterops.FillWindow(NativeConsole.GetConsoleWindow(), container);
        }
    }
}