using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Web;
using Kreta.Naplo.Domain.V3.Common;
using Kreta.Naplo.Domain.V3.Enum;

namespace Kreta.Naplo.WebApi.V3.Common.Logic
{
    internal static class FelhasznaloLogic
    {
        public static MobileUser GetFelhasznalo()
        {
            return HttpContext.Current.Items.Contains("MobileUser")
                ? (MobileUser)HttpContext.Current.Items["MobileUser"]
                : new MobileUser(GetInstituteCode(), GetInstituteUserId(), GetUserName(), GetRoles(), GetSchoolYearId(), GetUserIdpUniqueId(), GetInstituteUniqueId());
        }

        public static string GetInstituteCode()
        {
            return GetClaims("kreta:institute_code").Single();
        }

        private static Guid GetInstituteUniqueId()
        {
            return new Guid(GetClaims("kreta:institute_unique_id").Single());
        }

        public static int GetInstituteUserId()
        {
            var claim = GetClaims("kreta:institute_user_id").Single();
            return int.Parse(claim);
        }

        public static int GetSchoolYearId()
        {
            var claim = GetClaims("kreta:school_year_id").Single();
            return int.Parse(claim);
        }

        private static Guid GetUserIdpUniqueId()
        {
            return new Guid(GetClaims("kreta:institute_user_idp_unique_id").Single());
        }

        private static string GetUserName()
        {
            return GetClaims("kreta:user_name").Single();
        }

        public static IEnumerable<FelhasznaloSzerepkor> GetRoles()
        {
            var roles = GetClaims(ClaimTypes.Role);
            foreach (var role in roles)
            {
                if (Enum.TryParse(role, out FelhasznaloSzerepkor enumValue))
                {
                    yield return enumValue;
                }
            }
        }

        private static IEnumerable<string> GetClaims(string type)
        {
            return ClaimsPrincipal.Current.Claims.Where(x => x.Type == type).Select(x => x.Value);
        }
    }
}