using System;
using ln.application;
using ln.application.service;
using System.Threading;
using System.IO;
using ln.types.odb.ng;
using ln.skyscanner.entities;
using ln.logging;
using System.Collections.Generic;
using ln.types.odb.ng.storage;
using System.Linq;
using ln.types.net;
using ln.skyscanner.import.skytron;
namespace ln.skyscanner.services
{
    public class EntityService : ApplicationServiceBase
    {
        public string BasePath { get; private set; }

        public SkyScanner.Service CoreService { get; private set; }
        public RPC RPCInstance { get; private set; }

        public IStorageContainer StorageContainer { get; private set; }
        public IStorageContainer StorageSession { get; private set; }
        public Mapper SessionMapper { get; private set; }

        Queue<object> upsertQueue = new Queue<object>();

        public EntityService()
            :base("Entity Service")
        {
            DependOnService<SkyScanner.Service>();
            RPCInstance = new RPC(this);
        }

        public override void ServiceMain(IApplicationInterface applicationInterface)
        {
            CoreService = Dependency<SkyScanner.Service>();

            BasePath =  Path.Combine(
                                CurrentApplicationInterface.Arguments["base-path"].Value,
                                "entities"
                                );

            Logging.Log(LogLevel.INFO, "Entity Service: Initializing");

            StorageContainer = new FSStorageContainer(System.IO.Path.Combine(BasePath, "storage"));
            StorageSession = new Session(StorageContainer);
            SessionMapper = new Mapper(StorageSession);

            StorageContainer.Open();
            StorageSession.Open();


            CoreService.RPCContainer.Add("entities",RPCInstance);

            Ready();

            while (!StopRequested)
            {
                //object o;
                //while (
                //    (o = DequeueUpsert()) != null
                //    )
                //{
                //    ODB.GetCollection(o.GetType()).Upsert(o);
                //}
                lock (upsertQueue)
                {
                    if (upsertQueue.Count == 0)
                        Monitor.Wait(upsertQueue,2500);
                }
            }

            CoreService.RPCContainer.Remove(RPCInstance);
            CoreService = null;

            SessionMapper = null;
            StorageSession.Dispose();
            StorageContainer.Dispose();

            BasePath = null;
        }

        public void EnqueueUpsert<T>(T o) where T: class
        {
            //ObjectCollection<T> col = ODBMapper.GetCollection<T>();
            //lock (upsertQueue)
            //{
            //    upsertQueue.Enqueue(o);
            //    Monitor.Pulse(upsertQueue);
            //}
        }

        public object DequeueUpsert()
        {
            lock (upsertQueue)
            {
                if (upsertQueue.Count == 0)
                    return null;
                return upsertQueue.Dequeue();
            }
        }


        public class RPC
        {
            EntityService EntityService { get; }

            public RPC(EntityService entityService)
            {
                EntityService = entityService;
            }

            public Node GetNode(Guid nodeID)
            {
                return EntityService.SessionMapper.Load<Node>(Query.Equals<Node>("ID", nodeID)).FirstOrDefault();
            }

            public Node[] GetNodes()
            {
                return EntityService.SessionMapper.Load<Node>().ToArray();
            }

            public Node CreateNode()
            {
                Node node = new Node(IPv4.ANY);
                EntityService.SessionMapper.Save<Node>(node);
                return node;
            }

            public void SyncSkytron()
            {
                SkytronImport skytronImport = new SkytronImport(EntityService.CurrentApplicationInterface.Arguments["import-skytron"].Value);
                ThreadPool.QueueUserWorkItem((state) => skytronImport.Import(EntityService.SessionMapper));
                
            }
        }


    }
}