using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Sleis.Models;
using Sleis.ViewModels;
using Sleis.Service;

namespace Sleis.Utility
{
    public static class SessionUtility
    {
        private const string FILTERED_RELEASE_POINT_IDS= @"FilteredReleasePointIds";
        private const string LAST_RELEASE_POINT_FILTER_VALUE = @"LastReleasePointListFilterValue";
        private const string CURRENT_REPORT = "CurrentReport";
        public static AgencyReport CurrentReport
        {
            get { return Get<AgencyReport>(CURRENT_REPORT); }
            set { SetSessionVar<AgencyReport>(CURRENT_REPORT, value); }
        }
        /// <summary>
        /// Will return agency report year if available.  Otherwise will return current year
        /// </summary>
        public static int GetCurrentReportYear()
        {
            return CurrentReport != null ? CurrentReport.Number : DateTime.Now.Year;
        }
        public static int[] FilteredReleasePointIds
        {
            get
            {
                return Get<int[]>(FILTERED_RELEASE_POINT_IDS);
            }
            set
            {
                SetSessionVar(FILTERED_RELEASE_POINT_IDS, value);
            }
        }
        public static string LastReleasePointListFilterValue
        {
            get
            {
                return Get<string>(LAST_RELEASE_POINT_FILTER_VALUE);
            }
            set
            {
                SetSessionVar(LAST_RELEASE_POINT_FILTER_VALUE, value);
            }
        }

        public static T Get<T>(string key)
        {
            object obj = HttpContext.Current.Session[key];
            if (obj == null)
            {
                return default(T);
            }
            return (T)obj;
        }
        
        public static void SetSessionVar<T>(string key, T value)
        {
            if (value == null)
            {
                HttpContext.Current.Session.Remove(key);
            }
            else
            {
                HttpContext.Current.Session[key] = value;
            }
        }
        public static UserModel CurrentUser
        {
           get 
           { 
               //if not null return, otherwise we will try to restore session...
               if (CurrentUserView != null)
               {
                   return CurrentUserView.User;
               }
               return null;
               
           }
        }        
        public static UserView CurrentUserView
        {
            get { return HttpContext.Current.Session[UserModel.SESSION_USER_KEY] as UserView; }
            set { HttpContext.Current.Session[UserModel.SESSION_USER_KEY] = value; }
        }
        public static bool RestoreUserSession(IUserService userService)
        {
            UserView AppUser = new UserView();
            SleisVisit vist = AppUtility.GetVisit();
            if (vist != null && vist.IsAuthenticated)
            { 
                AppUser.User = userService.GetUser(vist.Id);
                CurrentUserView = AppUser;
                return true;
            }
            return false;
        }
    }
}