using System.Security.Claims;
using System.Text;
using System.Web.Mvc;
using DataModel.Models;
using WebInterface.Security;

namespace WebInterface.Helpers
{
    /// <summary>
    /// HTML helper methods
    /// </summary>
    public static class HtmlHelpers
    {
        /// <summary>
        /// Gets current user for request
        /// </summary>
        /// <param name="html">HTML helper context</param>
        /// <returns>LDAP entry for current session</returns>
        public static LDAPEntry CurrentUser(this HtmlHelper html)
        {
            //Verify user is authenticated before continuing
            if (!html.ViewContext.RequestContext.HttpContext.User.Identity.IsAuthenticated)
            {
                return null;
            }

            LDAPEntry currentUser = null;
            try
            {
                UserIdentity identity = new UserIdentity(html.ViewContext.RequestContext.HttpContext.User.Identity as ClaimsIdentity);
                currentUser = identity.ToLDAPEntry();
            }
            catch 
            {
                //Do nothing
            }

            return currentUser;
        }

        /// <summary>
        /// Generates logon control for user/session
        /// </summary>
        /// <param name="html">HTML helper context</param>
        /// <returns>Raw HTML output for logon control</returns>
        public static MvcHtmlString LogonControl(this HtmlHelper html)
        {
            LDAPEntry currentUser = html.CurrentUser();

            UrlHelper urlHelper = new UrlHelper(html.ViewContext.RequestContext);
            StringBuilder builder = new StringBuilder();

            if (currentUser == null || html.ViewContext.RequestContext.HttpContext.User.Identity==null|| !html.ViewContext.RequestContext.HttpContext.User.Identity.IsAuthenticated)
            {
                builder.AppendFormat("<a href='{0}' class='btn btn-primary'>Login</a>", urlHelper.Action("Login", "Account", null, null));
            }
            else
            {
                builder.AppendFormat("<span style='color: #9d9d9d;'>{0}</span> <a href='{1}' class='btn btn-primary'>Logout</a>", currentUser.DisplayName, urlHelper.Action("Logout", "Account", null, null));
            }

            return new MvcHtmlString(builder.ToString());
        }
    }
}