using System;
using System.Collections.Generic;
using System.Linq;
using FireSharp.Interfaces;
using FireSharp.Config;
using FireSharp;
using Newtonsoft.Json;
using System.Configuration;
using Herse.Models;

namespace KaraokePlayer.Classes
{
    public class FirebaseController 
    {
        private IFirebaseConfig config = new FirebaseConfig
        {
            AuthSecret = ConfigurationManager.AppSettings["Firebase.Secret"],
            BasePath = ConfigurationManager.AppSettings["Firebase.Path"]
        };
        private string _state = "stop";
        private IFirebaseClient _client;
        private ControllerStateChangedEventHandler _stateChanged;
        private ControllerSongChangedEventHandler _songChanged;
        private ControllerPlayQueueChangedEventHandler _playQueueChanged;

        private string StatePath
        {
            get { return string.Format("controllers/{0}/state/", this.Id); }
        }
        private string PlayQueuePath
        {
            get { return string.Format("controllers/{0}/queue/", this.Id); }
        }
        private string CurrentSongPath
        {
            get { return string.Format("controllers/{0}/queue/0/", this.Id); }
        }

        public string Id { get; set; }
        public Song CurrentSong { get; set; }
        public List<Song> PlayQueue { get; set; }

        public string State {
            get { return State; }
            set {
                _state = value;
                Update(string.Format("controllers/{0}", this.Id), new { state = _state });
            }
        }

        public FirebaseController(string clientId, ControllerStateChangedEventHandler stateChanged, ControllerSongChangedEventHandler songChanged, ControllerPlayQueueChangedEventHandler playQueueChanged)
        {
            Id = clientId;
            _stateChanged = stateChanged;
            _songChanged = songChanged;
            _playQueueChanged = playQueueChanged;
            PlayQueue = new List<Song>();
            _client = new FirebaseClient(config);
            Reset();
            SetupListener();
        }

        public void NextSong()
        {
            Song song = PlayQueue.FirstOrDefault();
            Stop();
            if(song != null) { PlaySong(song); }
        }

        public void PlaySong(Song song) { Update(string.Format("Controllers/{0}", this.Id), new { CurrentSong = song }); }

        public void Next() { this.State = "Next"; }

        public void Play() { this.State = "Play"; }

        public void Stop() { this.State = "Stop"; }

        public void Pause() { this.State = "Pause"; }

        private void Delete(string path) { _client.DeleteAsync(path); }

        private void Update(string path, object data) { _client.UpdateAsync(path, data); }

        private void Reset()
        {
            Stop();
            Delete(PlayQueuePath);
            Delete(CurrentSongPath); 
        }

        private async void SetupListener()
        {
            await _client.OnAsync(CurrentSongPath,
                added: (s, args, obj) =>
                {
                    if (args.Path == "/singer/name")
                    {
                        Console.WriteLine("added " + args.Path + "  " + args.Data);
                        CurrentSongDidChange();
                    }
                }, 
                removed: (s, args, obj) =>
                {
                    //TODO: the current song was removed from the queue
                    if (args.Path == "/singer")
                    {
                        Console.WriteLine("removed " + args.Path);
                    }
                }
           );
            /*
            await _client.OnAsync(PlayQueuePath,
                  added: (s, args, obj) =>
                  {
                      Console.WriteLine(args.Path);
                      if (args.Path.Contains("Id"))
                      {
                          PlayQueueDidChange();
                      }
                  },
                  changed: (s, args, obj) =>
                  {
                      if (args.Path.Contains("Id"))
                      {
                          PlayQueueDidChange();
                      }
                  },
                  removed: (s, args, obj) =>
                  {
                      PlayQueueDidChange();
                  }
             );

            await _client.OnAsync(StatePath,
                added: (s, args, obj) =>
                {
                    StateDidChange(args.Data);
                },
                changed: (s, args, obj) =>
                {
                    StateDidChange(args.Data);
                },
                removed: null
           );
           */
        }

        private void PlayQueueDidChange()
        {
            bool autoPlay = PlayQueue.Count() == 0;
            var response = _client.Get(PlayQueuePath);
            var dict = response.ResultAs<Dictionary<string, Song>>();

            PlayQueue.Clear();
            if (dict != null && dict.Count() > 0)
            {
                var array = dict.Values.ToArray();
                PlayQueue.AddRange(array);
                if (autoPlay)
                {
                    NextSong();
                }
            }
            if (_playQueueChanged != null) { _playQueueChanged(); }
        }

        private void CurrentSongDidChange()
        {
            var response = _client.Get(CurrentSongPath);
            var item = response.ResultAs<QueueItem>();
            if (item != null)
            {
                CurrentSong = item.Song;
                _songChanged(new ControllerSongChangedEventArgs(item.Song));
            }
        }

        private void StateDidChange(string state)
        {
            _state = state;
            PlayerState s = PlayerState.Play;
            if (state.ToLower() == "pause")
            {
                s = PlayerState.Pause;
            }
            else if (state.ToLower() == "stop")
            {
                s = PlayerState.Stop;
            }
            else if (state == "next")
            {
                s = PlayerState.Next;
            }
            //_stateChanged(new ControllerStateChangedEventArgs(s));
        }

    }
}