using System.Windows;
using System.Windows.Media;
using Microsoft.Win32;

namespace DeskCoreSetup;

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        bool uninstall = e.Args.Any(a => a.Equals("--uninstall", StringComparison.OrdinalIgnoreCase));
        bool silent = e.Args.Any(a => a.Equals("/S", StringComparison.OrdinalIgnoreCase));
        var dirArg = e.Args.FirstOrDefault(a => a.StartsWith("/D=", StringComparison.OrdinalIgnoreCase))?[3..];

        // Stille Installation/Deinstallation für Skripte: DeskCore-Setup.exe /S [/D=Ordner]  bzw.  --uninstall /S
        if (silent)
        {
            var progress = new Progress<(double, string)>(_ => { });
            try
            {
                if (uninstall) Installer.Uninstall(removeData: false, progress);
                else Installer.Install(dirArg ?? Installer.InstalledDir ?? Installer.DefaultDir,
                    desktopLink: true, autostart: Installer.AutostartEnabled, progress);
                Shutdown(0);
            }
            catch (Exception ex)
            {
                // ohne Oberfläche: Fehler für Skripte nachvollziehbar ablegen
                try { System.IO.File.WriteAllText(System.IO.Path.Combine(System.IO.Path.GetTempPath(), "DeskCore-Setup.log"), $"[{DateTime.Now}] {ex}"); } catch { }
                Shutdown(1);
            }
            return;
        }

        ApplyTheme();
        new MainWindow(uninstall).Show();
    }

    /// <summary>Hell/Dunkel und Akzentfarbe wie in Windows eingestellt.</summary>
    private void ApplyTheme()
    {
        bool light = ReadDword(@"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize", "AppsUseLightTheme") != 0;
        Resources.MergedDictionaries[0] = new ResourceDictionary
        {
            Source = new Uri($"pack://application:,,,/Themes/Colors.{(light ? "Light" : "Dark")}.xaml"),
        };
        int abgr = ReadDword(@"Software\Microsoft\Windows\DWM", "AccentColor") is var v and not -1 ? v : unchecked((int)0xFFD77800);
        var accent = Color.FromRgb((byte)abgr, (byte)(abgr >> 8), (byte)(abgr >> 16));
        var a = light ? Mix(accent, Colors.Black, 0.12) : Mix(accent, Colors.White, 0.45);
        Resources["AccentBrush"] = new SolidColorBrush(a);
        Resources["AccentHoverBrush"] = new SolidColorBrush(light ? Mix(a, Colors.White, 0.1) : Mix(a, Colors.Black, 0.1));
        Resources["OnAccentBrush"] = new SolidColorBrush(light ? Colors.White : Colors.Black);
        Resources["AccentSubtleBrush"] = new SolidColorBrush(Color.FromArgb(light ? (byte)0x22 : (byte)0x30, a.R, a.G, a.B));
        Resources["AccentSubtleStrokeBrush"] = new SolidColorBrush(Color.FromArgb(light ? (byte)0x55 : (byte)0x60, a.R, a.G, a.B));
    }

    private static int ReadDword(string key, string name)
    {
        try
        {
            using var k = Registry.CurrentUser.OpenSubKey(key);
            return k?.GetValue(name) is int i ? i : -1;
        }
        catch { return -1; }
    }

    private static Color Mix(Color c, Color with, double t) => Color.FromRgb(
        (byte)(c.R + (with.R - c.R) * t), (byte)(c.G + (with.G - c.G) * t), (byte)(c.B + (with.B - c.B) * t));
}