using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace AX.AudioSystem
{
    /// <summary>
    /// 表示一个播放列表。
    /// </summary>
    public class PlayList : IEnumerable<Track>
    {
        private Deque<Track> deque;

        public PlayList()
        {
            deque = new Deque<Track>();
        }

        public int Count { get { return deque.Count; } }

        public void Add(Track track)
        {
            deque.Add(track);
        }

        public void Add(string filename, bool played, bool playing)
        {
            var track = new Track();

            track.Filename = filename;
            track.Played = played;
            track.Playing = playing;

            deque.Add(track);
        }

        public bool Remove(string filename)
        {
            var index = IndexOf(filename);

            if (index == -1)
                return false;

            deque.RemoveAt(index);

            return true;
        }

        public int IndexOf(string filename)
        {
            var index = -1;

            for (var i = 0; i < deque.Count; ++i)
            {
                if (deque[i].Filename == filename)
                {
                    index = i;
                    break;
                }
            }

            return index;
        }

        public void Clear()
        {
            deque.Clear();
        }

        public Track this[int index]
        {
            get { return deque[index]; }
            set { deque[index] = value; }
        }

        public IEnumerator<Track> GetEnumerator()
        {
            return deque.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return this.GetEnumerator();
        }
    }
}