using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using Nancy;

namespace Sony.Filtr.API.Nancy.Extensions
{
    public static class ResponseExtensions
    {
        public static Response WithLastModified(this Response response, DateTime lastModified)
        {
            if (response.Headers == null)
            {
                response.Headers = new Dictionary<string, string>();
            }

            if (lastModified != DateTime.MaxValue && lastModified != DateTime.MinValue)
            {
                response.Headers["Last-Modified"] = lastModified.ToString("R");
            }
            
            return response;
        }

        public static Response WithFastlyKey(this Response response, params string[] keys)
        {
            if (response.Headers == null)
            {
                response.Headers = new Dictionary<string, string>();
            }

            response.Headers["Surrogate-Key"] = string.Join(" ", keys);
            return response;
        }

        public static Response WithCacheHeaders(this Response response, Cachable cachable, TimeSpan maxAge, int? staleWhileRevalidate = null, int? staleIfError = null)
        {
            //if (response.Headers == null)
            //{
            //    response.Headers = new Dictionary<string, string>();
            //}
            
            //response.Headers["Cache-Control"] =
            return response;
        }
    }

    public enum Cachable
    {
        @Public,
        @Private,
        NoCache,
        NoStore,
    }

    public enum CacheRevalidation
    {
        MustRevalidate,
        ProxyRevalidate,
    }
}