using Microsoft.Win32;

namespace EbbesMemeClipboard.Services;

public sealed class AutostartService : IAutostartService
{
    private const string RunKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Run";
    private const string ValueName = "EbbesMemeClipboard";

    public bool IsEnabled
    {
        get
        {
            using var key = Registry.CurrentUser.OpenSubKey(RunKeyPath, writable: false);
            return key?.GetValue(ValueName) is string existing && existing.Contains(ExecutablePath, StringComparison.OrdinalIgnoreCase);
        }
    }

    public void SetEnabled(bool enabled)
    {
        using var key = Registry.CurrentUser.OpenSubKey(RunKeyPath, writable: true)
            ?? Registry.CurrentUser.CreateSubKey(RunKeyPath, writable: true);

        if (enabled)
        {
            // Quoted because the path can contain spaces, which Windows would otherwise treat
            // as an argument boundary and fail to launch.
            key.SetValue(ValueName, $"\"{ExecutablePath}\"");
        }
        else
        {
            key.DeleteValue(ValueName, throwOnMissingValue: false);
        }
    }

    /// <summary>
    /// Environment.ProcessPath, not Assembly.Location: in a single-file published build the
    /// managed assemblies are never extracted to disk, so Assembly.Location returns an empty
    /// string and the registry entry would point at nothing.
    /// </summary>
    private static string ExecutablePath => Environment.ProcessPath ?? string.Empty;
}