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

namespace AeroMCSetup;

public partial class App : Application
{
    private static Mutex? _single;

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        bool has(string arg) => e.Args.Any(a => a.Equals(arg, StringComparison.OrdinalIgnoreCase));

        // Das Deinstallationsprogramm ist das Setup ohne angehängte App → ohne Anhang immer Deinstallation
        bool uninstall = has("--uninstall") || !Payload.Exists;
        bool silent = has("/S");
        bool update = has("--update");
        bool launch = has("/launch");
        var dirArg = e.Args.FirstOrDefault(a => a.StartsWith("/D=", StringComparison.OrdinalIgnoreCase))?.Substring(3);

        _single = new Mutex(true, "AeroMC-Setup", out bool first);
        if (!first)
        {
            Shutdown(0);
            return;
        }

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

        ApplyTheme();
        var mode = uninstall ? SetupMode.Uninstall : update ? SetupMode.Update : SetupMode.Install;
        new MainWindow(mode).Show();
    }

    protected override void OnExit(ExitEventArgs e)
    {
        try { _single?.ReleaseMutex(); } catch { }
        base.OnExit(e);
    }

    /// <summary>Hell/Dunkel 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"),
        };
        if (!light)
        {
            // im Dunkeln etwas heller, damit Text und Fortschrittsbalken gut lesbar bleiben
            var a = Color.FromRgb(0x4A, 0x86, 0xEA);
            Resources["AccentBrush"] = new SolidColorBrush(a);
            Resources["AccentHoverBrush"] = new SolidColorBrush(Color.FromRgb(0x5E, 0x94, 0xEE));
            Resources["AccentSubtleBrush"] = new SolidColorBrush(Color.FromArgb(0x30, a.R, a.G, a.B));
            Resources["AccentSubtleStrokeBrush"] = new SolidColorBrush(Color.FromArgb(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; }
    }
}

public enum SetupMode { Install, Update, Uninstall }