using System;
using System.Collections.Generic;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using CoviDok.Api;
using NCuid;

namespace CoviDok.BLL.Sessions
{
    class SessionHandler
    {
        private readonly ISessionProvider SessionStore;

        public SessionHandler(ISessionProvider Provider)
        {
            SessionStore = Provider;
        }

        public async Task<Session> GetSession(string SessionID)
        {
            string Candidate = SessionStore.Get(SessionID);
            if (Candidate == null) return null;
            Session session = null;
            await Task.Run(() => {
                session = JsonSerializer.Deserialize<Session>(Candidate);
                session.LastAccess = DateTime.Now;
                SessionStore.Set(SessionID, JsonSerializer.Serialize(session));
            });            
            return session;
        }

        public async Task<string> CreateSession(Role UserType, int UserID)
        {
            string ID = null;
            await Task.Run(() => {
                Session session = new Session
                {
                    ID = UserID,
                    Type = UserType,
                    LastAccess = DateTime.Now
                };
                ID = Cuid.Generate();
                SessionStore.Set(ID, JsonSerializer.Serialize(session));
            });            
            return ID;
        }

        public void DeleteSession(string SessionID)
        {
            SessionStore.Del(SessionID);
        }
    }
}