using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using Aurora.Backend.Models;
using Aurora.Backend.Utils;

namespace Aurora.Backend.Services
{
    public class LibraryService : BaseService<LibraryService>
    {
        #region Fields
        private string _pathName = "/Users/brandonwatson/Music/iTunes/iTunes Media/Music";
        private string _extensions = ".wav,.mp3,.aiff,.flac,.m4a,.m4b,.wma";
        private Dictionary<string, BaseSong> _library;


        #endregion Fields

        public LibraryService()
        {
            _library = new Dictionary<string, BaseSong>();
            LoadLibrary();
        }

        /// <summary>
        /// Gets the songs.
        /// </summary>
        /// <returns>The songs.</returns>
        public ObservableCollection<BaseSong> GetLibrary()
        {
            ObservableCollection<BaseSong> collection = new ObservableCollection<BaseSong>();
            foreach (KeyValuePair<string, BaseSong> pair in _library)
            {
                collection.Add(pair.Value);
            }

            return collection;
        }

        /// <summary>
        /// Loads library from files.
        /// </summary>
        private void LoadLibrary()
        {
            //Get songs
            List<FileInfo> musicFiles = FileSystemUtils.TraverseFoldersAsync(_pathName, _extensions);

            foreach (FileInfo file in musicFiles)
            {
                TagLib.File tagFile = TagLib.File.Create(file.FullName);

                BaseSong song = new LocalSong(file)
                {
                    Title = tagFile.Tag.Title,
                    Album = tagFile.Tag.Album,
                    Artist = tagFile.Tag.FirstAlbumArtist
                };

                _library.Add(song.Id, song);
            }
        }
    }
}