using System.IO;

namespace TaskbarLauncher.Services;

public static class StartupService
{
    private const string ShortcutName = "TaskbarLauncher.lnk";

    public static string StartupFolder => Environment.GetFolderPath(Environment.SpecialFolder.Startup);

    public static string ShortcutPath => Path.Combine(StartupFolder, ShortcutName);

    public static bool IsEnabled()
    {
        return File.Exists(ShortcutPath);
    }

    public static void SetEnabled(bool enabled)
    {
        if (enabled)
        {
            CreateShortcut();
        }
        else
        {
            RemoveShortcut();
        }
    }

    public static string? GetShortcutTarget()
    {
        if (!File.Exists(ShortcutPath))
        {
            return null;
        }

        Type shellType = Type.GetTypeFromProgID("WScript.Shell")
            ?? throw new InvalidOperationException("Windows Script Host is not available.");
        dynamic shell = Activator.CreateInstance(shellType)
            ?? throw new InvalidOperationException("Could not create Windows Script Host shell.");
        dynamic shortcut = shell.CreateShortcut(ShortcutPath);
        return shortcut.TargetPath;
    }

    private static void CreateShortcut()
    {
        Directory.CreateDirectory(StartupFolder);

        string executablePath = Environment.ProcessPath ?? Path.Combine(ConfigService.AppFolder, "TaskbarLauncher.exe");
        Type shellType = Type.GetTypeFromProgID("WScript.Shell")
            ?? throw new InvalidOperationException("Windows Script Host is not available.");
        dynamic shell = Activator.CreateInstance(shellType)
            ?? throw new InvalidOperationException("Could not create Windows Script Host shell.");
        dynamic shortcut = shell.CreateShortcut(ShortcutPath);
        shortcut.TargetPath = executablePath;
        shortcut.WorkingDirectory = ConfigService.AppFolder;
        shortcut.Description = "Start Taskbar Launcher";
        shortcut.Save();
    }

    private static void RemoveShortcut()
    {
        if (File.Exists(ShortcutPath))
        {
            File.Delete(ShortcutPath);
        }
    }
}