using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using Microsoft.Win32;

namespace v2rayN
{
    internal static class WindowsUtils
    {
        private static readonly string _tag = "WindowsUtils";

        /// <summary>
        /// 获取剪贴板数
        /// </summary>
        /// <returns></returns>
        public static string? GetClipboardData()
        {
            string? strData = string.Empty;
            try
            {
                IDataObject data = Clipboard.GetDataObject();
                if (data.GetDataPresent(DataFormats.UnicodeText))
                {
                    strData = data.GetData(DataFormats.UnicodeText)?.ToString();
                }
                return strData;
            }
            catch (Exception ex)
            {
                Logging.SaveLog(_tag, ex);
            }
            return strData;
        }

        /// <summary>
        /// 拷贝至剪贴板
        /// </summary>
        /// <returns></returns>
        public static void SetClipboardData(string strData)
        {
            try
            {
                Clipboard.SetText(strData);
            }
            catch
            {
            }
        }

        [DllImport("dwmapi.dll")]
        public static extern int DwmSetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE attribute, ref int attributeValue, uint attributeSize);

        public static ImageSource IconToImageSource(Icon icon)
        {
            return Imaging.CreateBitmapSourceFromHIcon(
                icon.Handle,
                new System.Windows.Int32Rect(0, 0, icon.Width, icon.Height),
                BitmapSizeOptions.FromEmptyOptions());
        }

        public static void SetDarkBorder(Window window, string? theme)
        {
            var isDark = theme switch
            {
                nameof(ETheme.Dark) => true,
                nameof(ETheme.Light) => false,
                _ => IsDarkTheme(),
            };

            SetDarkBorder(window, isDark);
        }

        private static void SetDarkBorder(Window window, bool dark)
        {
            // Make sure the handle is created before the window is shown
            IntPtr hWnd = new WindowInteropHelper(window).EnsureHandle();
            int attribute = dark ? 1 : 0;
            uint attributeSize = (uint)Marshal.SizeOf(attribute);
            DwmSetWindowAttribute(hWnd, DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1, ref attribute, attributeSize);
            DwmSetWindowAttribute(hWnd, DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE, ref attribute, attributeSize);
        }

        private static bool IsDarkTheme()
        {
            using var key = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize");
            var obj = key?.GetValue("AppsUseLightTheme");
            int.TryParse(obj?.ToString(), out var value);
            return value == 0;
        }

        #region Windows API

        [Flags]
        public enum DWMWINDOWATTRIBUTE : uint
        {
            DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1 = 19,
            DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
        }

        #endregion Windows API
    }
}
