using Kros.Extensions;
using Microsoft.Extensions.Primitives;

namespace ApiGateway
{
    public class Loggin
    {
        //public string GetRequestIP(HttpContext ctx, bool tryUseXForwardHeader = true)
        //{
        //    string ip = null;

        //    // todo support new "Forwarded" header (2014) https://en.wikipedia.org/wiki/X-Forwarded-For

        //    // X-Forwarded-For (csv list):  Using the First entry in the list seems to work
        //    // for 99% of cases however it has been suggested that a better (although tedious)
        //    // approach might be to read each IP from right to left and use the first public IP.
        //    // http://stackoverflow.com/a/43554000/538763
        //    //
        //    if (tryUseXForwardHeader)
        //    {
        //        ip = GetHeaderValueAs<string>(ctx, "X-Forwarded-For");
        //        ip = SplitCsv(ip).FirstOrDefault();

        //    }

        //    // RemoteIpAddress is always null in DNX RC1 Update1 (bug).
        //    if (IsNullOrWhitespace(ip) && ctx?.Connection?.RemoteIpAddress != null)
        //        ip = ctx.Connection.RemoteIpAddress.ToString();

        //    if (IsNullOrWhitespace(ip))
        //        ip = GetHeaderValueAs<string>(ctx, "REMOTE_ADDR");

        //    // _httpContextAccessor.HttpContext?.Request?.Host this is the local host.

        //    if (IsNullOrWhitespace(ip))
        //        throw new Exception("Unable to determine caller's IP.");

        //    return ip;
        //}

        //public T GetHeaderValueAs<T>(HttpContext ctx, string headerName)
        //{
        //    StringValues values;

        //    if (ctx?.Request?.Headers?.TryGetValue(headerName, out values) ?? false)
        //    {
        //        string rawValues = values.ToString();   // writes out as Csv when there are multiple.

        //        if (!IsNullOrWhitespace(rawValues))
        //            return (T)Convert.ChangeType(values.ToString(), typeof(T));
        //    }
        //    return default(T);
        //}

        //public List<string> SplitCsv(string csvList, bool nullOrWhitespaceInputReturnsNull = false)
        //{
        //    if (string.IsNullOrWhiteSpace(csvList))
        //        return nullOrWhitespaceInputReturnsNull ? null : new List<string>();

        //    return csvList
        //        .TrimEnd(',')
        //        .Split(',')
        //        .AsEnumerable<string>()
        //        .Select(s => s.Trim())
        //        .ToList();
        //}

        //public bool IsNullOrWhitespace(string s)
        //{
        //    return String.IsNullOrWhiteSpace(s);
        //}
    }
}