using System.Net;

namespace LightlessSyncAuthService.Utils
{
    public static class HttpContextAccessorExtensions
    {
        public static IPAddress? GetClientIpAddress(this IHttpContextAccessor accessor)
        {
            var context = accessor.HttpContext;
            if (context == null) return null;

            string[] headerKeys = { "CF-Connecting-IP", "X-Forwarded-For", "X-Real-IP" };
            foreach (var key in headerKeys)
            {
                if (context.Request.Headers.TryGetValue(key, out var values))
                {
                    var ipCandidate = values.FirstOrDefault()?.Split(',').FirstOrDefault()?.Trim();
                    if (IPAddress.TryParse(ipCandidate, out var parsed))
                        return parsed;
                }
            }

            return context.Connection?.RemoteIpAddress;
        }
    }
}