using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Authentication;
using System.Text;
using System.Web;
using Telligent.Evolution.Extensibility.Rest.Version1;

namespace Samples
{
    public class APIKeyRestHost : Telligent.Evolution.Extensibility.Rest.Version1.RestHost
    {
        private string _communityUrl = null;
        private string _adminAPIKey = null;
        private string _adminUserName = null;

        public APIKeyRestHost(string communityUrl, string adminUserName, string adminApiKey)
        {
            _communityUrl = communityUrl;
            _adminAPIKey = adminApiKey;
            _adminUserName = adminUserName;
        }
        public override void ApplyAuthenticationToHostRequest(System.Net.HttpWebRequest request, bool forAccessingUser)
        {
            var adminKey = String.Format("{0}:{1}", _adminAPIKey, _adminUserName);
            var adminKeyBase64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(adminKey));

            request.Headers.Add("Rest-User-Token", adminKeyBase64);

            if (forAccessingUser)
            {
                var httpContext = this.GetCurrentHttpContext();
                if (!httpContext.User.Identity.IsAuthenticated)
                    throw new AuthenticationException("This REST Host does not support anonymous access.");

                var username = httpContext.User.Identity.Name;
                var user = this.GetToDynamic(2, "users/{username}.json", false, new RestGetOptions()
                {
                    PathParameters = { { "username", username } }
                });

                if (user == null)
                    throw new ApplicationException(string.Format("User '{0}' wasn't found.  Create this user in your community first"));

                //NOTE: You could attempt to auto create the account using the admin API key, this host chooses not to.

                //Apply impersonation
                request.Headers.Add("Rest-Impersonate-User", username);

            }
        }

        public override string EvolutionRootUrl
        {
            get { return _communityUrl; }
        }

        public override string Name
        {
            get { return "APIKeyRestHost"; }
        }
    }
}