using Microsoft.AspNetCore.Http;

namespace MareSynchronosShared;

public static class Extensions
{
    public static string GetIpAddress(this IHttpContextAccessor accessor)
    {
        if (!string.IsNullOrEmpty(accessor.HttpContext.Request.Headers["CF-CONNECTING-IP"]))
            return accessor.HttpContext.Request.Headers["CF-CONNECTING-IP"];

        if (!string.IsNullOrEmpty(accessor.HttpContext.Request.Headers["X-Forwarded-For"]))
        {
            return accessor.HttpContext.Request.Headers["X-Forwarded-For"];
        }

        var ipAddress = accessor.HttpContext.GetServerVariable("HTTP_X_FORWARDED_FOR");

        if (!string.IsNullOrWhiteSpace(ipAddress))
        {
            var addresses = ipAddress.Split(',', StringSplitOptions.RemoveEmptyEntries);
            var lastEntry = addresses.LastOrDefault();
            if (lastEntry != null)
            {
                return lastEntry;
            }
        }

        return accessor.HttpContext.Connection.RemoteIpAddress.ToString();
    }
}