using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AudioPlayerMusterlösung
{
    internal class AudioPlayer
    {
        private AudioFile[] audiofiles;

        public AudioPlayer(int max)
        {
            audiofiles = new AudioFile[max];
        }
        public void AddFile(AudioFile audiofile)
        {
            for (int i = 0; i < audiofiles.Length; i++)
            {
                if (audiofiles[i] is null)
                {
                    audiofiles[i] = audiofile;
                    break;
                }
            }
        }
        public void RemoveFile(int id)
        {
            if (id >= 0 && id < audiofiles.Length)
            {
                audiofiles[id] = null;
            }
        }
        public void Play(int id)
        {
            if (id >= 0 && id < audiofiles.Length && audiofiles[id] is null)
            {
                audiofiles[id].Play();
            }
        }
        public void PlayAll()
        {
            foreach (AudioFile audio in audiofiles)
            {
                if (audio is not null)
                {
                    audio.Play();
                }
            }
        }
        public void PlayShuffle()
        {
            Random rnd = new Random();
            AudioFile[] playFiles = new AudioFile[audiofiles.Length];
            for (int i = 0; i < playFiles.Length; i++)
            {
                playFiles[i] = audiofiles[i];
            }
            while (playFiles.Length > 0)
            {
                int playFile = rnd.Next(playFiles.Length);
                if (playFiles[playFile] is not null)
                {
                    playFiles[playFile].Play();
                }
                AudioFile[] newArray = new AudioFile[playFiles.Length - 1];
                for (int i = 0; i < playFile; i++)
                {
                    newArray[i] = playFiles[i];
                }
                for (int i = playFile; i < newArray.Length; i++)
                {
                    newArray[i] = playFiles[i + 1];
                }
                playFiles = newArray;
            }
        }
    }
}