using Microsoft.Xna.Framework.Media;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace RhythmBullet.Zer01HD.Audio
{
    internal class MusicList
    {
        private volatile bool work;
        private List<string> list = new List<string>();
        public List<string> List
        {
            get
            {
                if (!thread.IsAlive)
                {
                    lock (list)
                    {
                        return list;
                    }
                }
                else
                {
                    return null;
                }
            }
        }
        private string path;
        private Thread thread;

        public MusicList()
        {

        }

        public void Start()
        {
            if (thread == null || !thread.IsAlive)
            {
                work = true;
                thread = new Thread(Search);
                thread.Name = "Music Search Thread";
                thread.Start();
            }
        }

        public void Stop()
        {
            work = false;
        }

        private void Search()
        {
            lock (list)
            {
                list.AddRange(recursiveMusicSearch(path));
            }
        }

        private List<string> recursiveMusicSearch(string path)
        {
            List<string> musicFiles = new List<string>();
            string[] files = Directory.GetFiles(path);
            for (int i = 0; i < files.Length && work; i++)
            {
                if (Directory.Exists(files[i]))
                {
                    musicFiles.AddRange(recursiveMusicSearch(files[i]));
                }
                else
                {
                    try
                    {
                        SupportedFormats format;
                        Enum.TryParse<SupportedFormats>(Path.GetExtension(files[i]).ToUpper(), out format);
                        musicFiles.Add(files[i]);
                    }
                    catch (ArgumentException e)
                    {
                        Console.WriteLine("MusicList", "Unsupported file format: " + Path.GetFileName(files[i]));
                        Console.WriteLine(e);
                    }
                }
            }
            return musicFiles;
        }
    }
}