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

namespace KaraokePlayer.Classes
{
    public class FirebaseSong : ISong
    {
        public Guid 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
    {
        public static Guid TestGuid = Guid.Parse("f1ec2c8a-6f11-4ac0-8b0e-e576d15f2759"); 
        private IFirebaseConfig config = new FirebaseConfig
        {
            AuthSecret = "wj0ERDFZqNSysTtIXcCgCr8Itahr6pJOBeqCjvDF",
            BasePath = "https://karaokecontroller.firebaseio.com/"
        };
        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}/PlayQueue", this.Id); }
        }
        private string CurrentSongPath
        {
            get { return string.Format("Controllers/{0}/CurrentSong", this.Id); }
        }

        public Guid Id { get; set; }
        public ISong CurrentSong { get; set; }
        public List<ISong> PlayQueue { get; set; }

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

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

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

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

        public void AddSong(ISong song) { Update(string.Format("Controllers/{0}/PlayQueue/{1}", this.Id, song.Id), song); }

        public void RemoveSong(ISong song)
        {
            ISong found = PlayQueue.FirstOrDefault(s => s.Id == song.Id);
            if (found != null)
            {
                PlayQueue.Remove(found);
                Delete(PlayQueuePath + "/" + song.Id);
            }
        }

        public void SkipSong()
        {
            ISong song = null;
            int count = PlayQueue.Count();
            int index = PlayQueue.FindIndex(s => s.Id == CurrentSong.Id);
            if (index + 1 == count && count > 1)
            {
                song = PlayQueue.First();
            }
            else {
                if (PlayQueue.Count() > index)
                {
                    song = PlayQueue[index + 1];
                }
            }
            Stop();
            if(song != null)
            {
                PlaySong(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.Contains("Id"))
                    {
                        CurrentSongDidChange();
                    }
                },
                changed: (s, args, obj) =>
                {
                    if (args.Path.Contains("Id"))
                    {
                        CurrentSongDidChange();
                    }
                },
                removed: null
           );

            await _client.OnAsync(PlayQueuePath,
                  added: (s, args, obj) =>
                  {
                      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, FirebaseSong>>();

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

        private void CurrentSongDidChange()
        {
            var response = _client.Get(CurrentSongPath);
            var song = response.ResultAs<FirebaseSong>();
            if (song != null)
            {
                CurrentSong = song;
                _songChanged(new ControllerSongChangedEventArgs(false, 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));
        }

    }
}