using System;
using System.Web;
using Telligent.Evolution.Extensibility;
using Telligent.Evolution.Extensibility.Api.Entities.Version1;
using Telligent.Evolution.Extensibility.Api.Version1;
using Telligent.Evolution.Extensibility.Security.Version2;

namespace Sample
{
    class SampleAuthenticationPlugin : IAuthenticationPlugin
    {
        #region IPlugin Implementation

        public string Name
        {
            get { return "Sample Authentication Single-Sign-On Client"; }
        }

        public string Description
        {
            get { return "Sample IAuthentication plugin implementation."; }
        }

        public void Initialize()
        {
            // Leave blank if not needed.
        }

        #endregion

        public int? GetAuthenticatedUserId(AuthenticationOptions options)
        {
            // Check the HttpContext from the given options
            HttpContextBase context = options.HttpContext;
            if (context == null)
                return null;

            // Use the context to extract the needed information about the accessing user.
            // For instance, from a certain cookie...
            HttpCookie cookie = context.Request.Cookies["CookieName"];
            if (cookie == null)
                return null;

            // or from the context ASP.net user.
            if (context.User == null || context.User.Identity == null || string.IsNullOrEmpty(context.User.Identity.Name))
                return null;

            // Extract information to identify the user.

            // Access the User API and find the user based on the information retrieved above.
            var userApi = Apis.Get<IUsers>();

            User foundUser = userApi.Get(new UsersGetOptions { Username = "username" });

            if (foundUser == null)
            {
                // If the user doesn't exist, you may want to create an account
                // if you are trying to stay synced with another system.

                // If not, you can throw an exception here about the login failing.
                throw new Exception("Login Failed");
            }

            // Assuming a user was found, return the id for Community to use.
            return foundUser.Id;
        }
    }
}