/*************************************************************************/
/*  event_stream.h                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/
#ifndef EVENT_STREAM_H
#define EVENT_STREAM_H

#include "resource.h"
#include "servers/audio_server.h"

class EventStreamPlayback : public Reference {

	OBJ_TYPE(EventStreamPlayback, Reference);

	class InternalEventStream : public AudioServer::EventStream {
	public:
		AudioMixer *_get_mixer() { return get_mixer(); }
		EventStreamPlayback *playback;
		virtual void update(uint64_t p_usec) {

			playback->_update(get_mixer(), p_usec);
		}

		virtual ~InternalEventStream() {}
	};

	InternalEventStream estream;

	RID stream;
	bool playing;

protected:
	virtual AudioMixer *_get_mixer() { return estream._get_mixer(); }
	virtual Error _play() = 0;
	virtual bool _update(AudioMixer *p_mixer, uint64_t p_usec) = 0;
	virtual void _stop() = 0;

public:
	virtual Error play();
	virtual void stop();
	virtual bool is_playing() const;

	virtual void set_paused(bool p_paused) = 0;
	virtual bool is_paused() const = 0;

	virtual void set_loop(bool p_loop) = 0;
	virtual bool is_loop_enabled() const = 0;

	virtual int get_loop_count() const = 0;

	virtual float get_pos() const = 0;
	virtual void seek_pos(float p_time) = 0;

	virtual void set_volume(float p_vol) = 0;
	virtual float get_volume() const = 0;

	virtual void set_pitch_scale(float p_pitch_scale) = 0;
	virtual float get_pitch_scale() const = 0;

	virtual void set_tempo_scale(float p_tempo_scale) = 0;
	virtual float get_tempo_scale() const = 0;

	virtual void set_channel_volume(int p_channel, float p_volume) = 0;
	virtual float get_channel_volume(int p_channel) const = 0;

	virtual float get_last_note_time(int p_channel) const = 0;
	EventStreamPlayback();
	~EventStreamPlayback();
};

class EventStream : public Resource {

	OBJ_TYPE(EventStream, Resource);
	OBJ_SAVE_TYPE(EventStream); //children are all saved as EventStream, so they can be exchanged

public:
	virtual Ref<EventStreamPlayback> instance_playback() = 0;

	virtual String get_stream_name() const = 0;
	virtual float get_length() const = 0;
	virtual int get_channel_count() const = 0;

	EventStream();
};

#endif // EVENT_STREAM_H