using System;
using System.Collections.ObjectModel;
using System.IO;
using ANX.Framework.Audio;
using ANX.Framework.NonXNA;
using ANX.Framework.NonXNA.SoundSystem;
using OpenTK;
using OpenTK.Audio.OpenAL;

// This file is part of the ANX.Framework created by the
// "ANX.Framework developer group" and released under the Ms-PL license.
// For details see: http://anxframework.codeplex.com/license

namespace ANX.SoundSystem.OpenAL
{
	public class Creator : ISoundSystemCreator
	{
		#region Public
		public string Name
		{
			get
			{
				return "Sound.OpenAL";
			}
		}

		public int Priority
		{
			get
			{
				return 100;
			}
		}

		public bool IsSupported
		{
			get
			{
				PlatformName os = OSInformation.GetName();
				return OSInformation.IsWindows ||
					os == PlatformName.Linux ||
					os == PlatformName.MacOSX;
			}
		}

		public float DistanceScale
		{
			get
			{
				return 1f;
				//throw new NotImplementedException();
			}
			set
			{
				//throw new NotImplementedException();
			}
		}

		public float DopplerScale
		{
			get
			{
				return AL.Get(ALGetFloat.DopplerFactor);
			}
			set
			{
				AL.DopplerFactor(value);
			}
		}

		public float MasterVolume
		{
			get
			{
				return 1f;
				//throw new NotImplementedException();
			}
			set
			{
				//throw new NotImplementedException();
			}
		}

		public float SpeedOfSound
		{
			get
			{
				return AL.Get(ALGetFloat.SpeedOfSound);
			}
			set
			{
				AL.SpeedOfSound(value);
			}
		}
		#endregion

		public Creator()
		{
			Init();
		}

		private void Init()
		{
			IntPtr deviceHandle;
			ContextHandle context = Alc.GetCurrentContext();
			if (context.Handle != IntPtr.Zero)
			{
				deviceHandle = Alc.GetContextsDevice(context);
			}
			else
			{
				deviceHandle = Alc.OpenDevice(Alc.GetString(IntPtr.Zero, AlcGetString.DefaultDeviceSpecifier));
				context = Alc.CreateContext(deviceHandle, new int[0]);
			}

			bool isNowCurrent = Alc.MakeContextCurrent(context);
		}

		#region CreateSoundEffectInstance
		public ISoundEffectInstance CreateSoundEffectInstance(ISoundEffect nativeSoundEffect)
		{
			PreventSystemChange();
			return new OpenALSoundEffectInstance(nativeSoundEffect as OpenALSoundEffect);
		}
		#endregion

		#region CreateSoundEffect
		public ISoundEffect CreateSoundEffect(SoundEffect parent, Stream stream)
		{
			PreventSystemChange();
			return new OpenALSoundEffect(parent, stream);
		}
		#endregion

		#region CreateSoundEffect
		public ISoundEffect CreateSoundEffect(SoundEffect parent, byte[] buffer, int offset, int count, int sampleRate,
			AudioChannels channels, int loopStart, int loopLength)
		{
			PreventSystemChange();
			return new OpenALSoundEffect(parent, buffer, offset, count, sampleRate, channels, loopStart, loopLength);
		}
		#endregion

		#region CreateAudioListener
		public IAudioListener CreateAudioListener()
		{
			PreventSystemChange();
			return new OpenALAudioListener();
		}
		#endregion

		#region CreateAudioEmitter (TODO)
		public IAudioEmitter CreateAudioEmitter()
		{
			PreventSystemChange();
			throw new NotImplementedException();
		}
		#endregion

		#region CreateMicrophone
		public IMicrophone CreateMicrophone(Microphone managedMicrophone)
		{
			PreventSystemChange();
			throw new NotImplementedException();
		}
		#endregion

		#region GetAllMicrophones
		public ReadOnlyCollection<Microphone> GetAllMicrophones()
		{
			PreventSystemChange();
			throw new NotImplementedException();
		}
		#endregion

		#region GetDefaultMicrophone
		public int GetDefaultMicrophone(ReadOnlyCollection<Microphone> allMicrophones)
		{
			PreventSystemChange();
			throw new NotImplementedException();
		}
		#endregion

		private void PreventSystemChange()
		{
			AddInSystemFactory.Instance.PreventSystemChange(AddInType.SoundSystem);
		}
	}
}