using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using KaraokePlayer.Interfaces;
using KaraokePlayer.Enums;
using FireSharp.Interfaces;
using FireSharp.Config;
using FireSharp;

namespace KaraokePlayer.Classes
{
    public class FirebaseSong : ISong
    {
        public string FirebaseId { get; set; }
        public int Id { get; set; }
        public int Order { get; set; }
        public string Title { get; set; }
        public string Artist { get; set; }
        public FileType FileType { get; set; }
        public string Path { get; set; }
        public string Description { get { return Artist + " - " + Title; } }
    }

    public class FirebaseController : IController
    {
        private IFirebaseConfig config = new FirebaseConfig
        {
            AuthSecret = "wj0ERDFZqNSysTtIXcCgCr8Itahr6pJOBeqCjvDF",
            BasePath = "https://karaokecontroller.firebaseio.com/"
        };
        private IFirebaseClient client;
        private ControllerStateChangedEventHandler StateChanged;
        private ControllerSongChangedEventHandler SongChanged;
        private ControllerPlayQueueChangedEventHandler PlayQueueChanged;
        public FirebaseController(ControllerStateChangedEventHandler stateChanged, ControllerSongChangedEventHandler songChanged, ControllerPlayQueueChangedEventHandler playQueueChanged)
        {
            StateChanged = stateChanged;
            SongChanged = songChanged;
            PlayQueueChanged = playQueueChanged;
            PlayQueue = new List<ISong>();
            client = new FirebaseClient(config);
            client.DeleteAsync("controller/state");
            client.PushAsync("controller/state", "stop");
            client.DeleteAsync("controller/playQueue");
            client.DeleteAsync("controller/currentSong");
            ListenToStream();
        }

        public int Id { get; set; }
        public ISong CurrentSong { get; set; }
        public List<ISong> PlayQueue { get; set; }
        public void GetNextSong()
        {
            ISong song = PlayQueue.FirstOrDefault();
            Stop();
            client.DeleteAsync("controller/currentSong");
            client.PushAsync("controller/currentSong", song);
        }

        public void PlaySong(ISong song)
        {
            client.DeleteAsync("controller/currentSong");
            client.PushAsync("controller/currentSong", song);
        }
        public void AddSongToQueue(ISong song)
        {
            client.PushAsync("controller/playQueue", song);
        }

        public void RemoveSong(ISong song)
        {
            ISong found = PlayQueue.FirstOrDefault(s => s.Id == song.Id);
            if (found != null)
            {
                PlayQueue.Remove(found);
                client.DeleteAsync("controller/playQueue/" + ((FirebaseSong)song).FirebaseId);
            }
        }
        public void Next()
        {
            client.DeleteAsync("controller/state");
            client.PushAsync("controller/state", "next");
        }

        public void Play()
        {
            client.DeleteAsync("controller/state");
            client.PushAsync("controller/state", "play");
        }

        public void Stop()
        {
            client.DeleteAsync("controller/state");
            client.PushAsync("controller/state", "stop");
        }

        public void Pause()
        {
            client.DeleteAsync("controller/state");
            client.PushAsync("controller/state", "pause");
        }

        private async void ListenToStream()
        {
            await client.OnAsync("controller/currentSong",
                added: (s, args, obj) =>
                {
                    if (args.Path.Contains("Id"))
                    {
                        CurrentSongChanged();
                    }
                },
                changed: (s, args, obj) =>
                {
                    if (args.Path.Contains("Id"))
                    {
                        CurrentSongChanged();
                    }
                },
                removed: null
           );

            await client.OnAsync("controller/playQueue",
                  added: (s, args, obj) =>
                  {
                      if (args.Path.Contains("Id"))
                      {
                          ReloadPlayQueue();
                      }
                  },
                  changed: (s, args, obj) =>
                  {
                      if (args.Path.Contains("Id"))
                      {
                          ReloadPlayQueue();
                      }
                  },
                  removed: (s, args, obj) =>
                  {
                      ReloadPlayQueue();
                  }
             );

            await client.OnAsync("controller/state",
                added: (s, args, obj) =>
                {
                    RemoteStateChanged(args.Data);
                },
                changed: (s, args, obj) =>
                {
                    RemoteStateChanged(args.Data);
                },
                removed: null
           );
        }

        private void ReloadPlayQueue()
        {
            bool autoPlay = PlayQueue.Count() == 0;
            var response = client.Get("controller/playQueue");
            var dict = response.ResultAs<Dictionary<string, FirebaseSong>>();

            PlayQueue.Clear();
            if (dict.Count() > 0)
            {
                foreach (KeyValuePair<string, FirebaseSong> entry in dict)
                {
                    entry.Value.FirebaseId = entry.Key;
                }

                var array = dict.Values.OrderBy(s => s.Order).ToArray();
                PlayQueue.AddRange(array);
                if (autoPlay)
                {
                    GetNextSong();
                }
            }
            if (PlayQueueChanged != null) { PlayQueueChanged(); }
        }

        private void CurrentSongChanged()
        {
            var response = client.Get("controller/currentSong");
            var dict = response.ResultAs<Dictionary<string, FirebaseSong>>();

            var song = dict.Values.FirstOrDefault();
            if (song != null)
            {
                CurrentSong = song;
                SongChanged(new ControllerSongChangedEventArgs(false, song));
            }
        }

        private void RemoteStateChanged(string 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));
        }

    }
}