namespace ASPTemplate.Backend.Utils;

public static class AuthUtil {
	public const  string OverrideAuthCli    = "--disable-auth";
	private const string InternalUserPrefix = "_";
	private const string GuestUser          = $"{InternalUserPrefix}guest";
	private const string FallbackUser       = $"{InternalUserPrefix}debug";

	private static readonly string[] FallbackGroups = { "admin" };

	public static readonly bool OverrideAuth = Environment.GetCommandLineArgs().Contains(OverrideAuthCli);

	public static string GetRemoteUser(this HttpContext ctx) =>
		OverrideAuth ? FallbackUser : ctx.Request.Headers.TryGetValue("Remote-User", out var header) ? header.ToString() : GuestUser;

	public static bool IsAuthenticated(this HttpContext ctx) => OverrideAuth || ctx.Request.Headers.ContainsKey("Remote-User");

	public static IEnumerable<string> GetRemoteGroups(this HttpContext ctx) {
		if (OverrideAuth)
			return FallbackGroups;

		return ctx.Request.Headers.TryGetValue("Remote-Groups", out var header) ? header.ToString().Split(",") : Array.Empty<string>();
	}
}