using System;
using System.Windows;
using NAudio;
using NAudio.Wave;


namespace CrystalAudioTests
{
    class AudioPlayback
    {
        public static IWavePlayer playbackDevice;
        public static WaveStream fileStream;

        public static void PlayFile()
        {
            if (playbackDevice != null && fileStream != null && playbackDevice.PlaybackState != PlaybackState.Playing)
            {
                playbackDevice.Play();
            }
        }

        public static void CreateDevice()
        {
            playbackDevice = new WaveOut { DesiredLatency = 200 };
        }

        public static void OpenFile(string filename)
        {
            var inputStream = new AudioFileReader(filename);
            fileStream = inputStream;
            var aggregator = new SampleAggregator(inputStream);
            playbackDevice.Init(aggregator);
        }

        public static void Pause()
        {
           if (playbackDevice != null)
           {
                playbackDevice.Pause();
           }
        }

        public static void Stop()
        {
           if (playbackDevice != null)
            {
                playbackDevice.Stop();
            }
            if (fileStream != null)
            {
                fileStream.Position = 0;
            }

        }

        public static void CloseFile()
        {
            if (fileStream != null)
            {
                fileStream.Dispose();
                fileStream = null;
            }
        }

        public static void EnsureDeviceCreated()
        {
            if (playbackDevice == null)
            {
                CreateDevice();
            }
        }

        public static void Load(string fileName)
        {
           /*  Stop();
            //CloseFile();
            //EnsureDeviceCreated();
            OpenFile(fileName);
            * */
            Stop();
            CreateDevice();
            OpenFile(fileName);
            PlayFile();
        }

        public static void Dispose()
        {
            Stop();
            CloseFile();
            if (playbackDevice != null)
            {
                playbackDevice.Dispose();
                playbackDevice = null;
            }
        }