using System;
using System.Collections.Generic;
using System.Linq;

using IwbZero.Authorization.Base.Users;

namespace IwbZero.Runtime.Session
{
    public static class IwbSessionExtensions
    {
        public static string GetUserName(this IIwbSession session)
        {
            return GetClaimValue(session, IwbClaimTypes.UserName);
        }

        public static string GetRealName(this IIwbSession session)
        {
            return GetClaimValue(session, IwbClaimTypes.RealName);
        }

        public static string GetUserSingleRole(this IIwbSession session)
        {
            return GetClaimValue(session, IwbClaimTypes.UserRoles);
        }

        public static string[] GetUserRoles(this IIwbSession session)
        {
            var claim = session.GetClaim(IwbClaimTypes.UserRoles);
            return claim?.Value.Split(new char[','], StringSplitOptions.RemoveEmptyEntries);
        }

        public static IEnumerable<string> GetUserRoleList(this IIwbSession session)
        {
            var claim = session.GetClaim(IwbClaimTypes.UserRoles);
            return claim?.Value?.Split(new char[','], StringSplitOptions.RemoveEmptyEntries).ToList() ?? new List<string>();
        }

        public static IEnumerable<string> GetUserRoleIdList(this IIwbSession session)
        {
            var claim = session.GetClaim(IwbClaimTypes.UserRoleIds);
            return claim?.Value?.Split(new char[','], StringSplitOptions.RemoveEmptyEntries).ToList() ?? new List<string>();
        }

        public static int? GetUserType(this IIwbSession session)
        {
            return GetClaimValue<int>(session, IwbClaimTypes.UserType);
        }

        public static string GetEmailAddress(this IIwbSession session)
        {
            return GetClaimValue(session, IwbClaimTypes.EmailAddress);
        }

        public static bool? GetRememberMe(this IIwbSession session)
        {
            return GetClaimValue<bool>(session, IwbClaimTypes.RememberMe);
        }

        public static DateTimeOffset? GetExpireTime(this IIwbSession session)
        {
            return GetClaimValue<DateTimeOffset>(session, IwbClaimTypes.ExpireTime);
        }

        public static T? GetClaimValue<T>(this IIwbSession session, string claimTypes)
            where T : struct
        {
            var claim = session.GetClaim(claimTypes);
            if (string.IsNullOrEmpty(claim?.Value))
                return null;
            var result = (T)Convert.ChangeType(claim.Value, typeof(T));
            return result;
        }

        public static string GetClaimValue(this IIwbSession session, string claimTypes)
        {
            var claim = session.GetClaim(claimTypes);
            return claim?.Value ?? "";
        }

        public static bool IsUser(this IIwbSession session, UserBase user)
        {
            if (session == null)
            {
                throw new ArgumentNullException(nameof(session));
            }

            if (user == null)
            {
                throw new ArgumentNullException(nameof(user));
            }

            return session.TenantId == user.TenantId &&
                session.UserId.HasValue &&
                session.UserId.Value == user.Id;
        }
    }
}