/*
 * Copyright (C) 2010-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2010-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2011-2014 David Robillard <d@drobilla.net>
 * Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2014 Ben Loftis <ben@harrisonconsoles.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef __ardour_monitor_processor_h__
#define __ardour_monitor_processor_h__

#include <algorithm>
#include <iostream>
#include <vector>

#include "pbd/signals.h"
#include "pbd/compose.h"
#include "pbd/controllable.h"

#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/processor.h"

#include "ardour/dB.h"

class XMLNode;

namespace ARDOUR {

class Session;

template<typename T>
class /*LIBARDOUR_API*/ MPControl : public PBD::Controllable {
public:
	MPControl (T initial, const std::string& name, PBD::Controllable::Flag flag,
	           float lower = 0.0f, float upper = 1.0f)
		: PBD::Controllable (name, flag)
		, _value (initial)
		, _lower (lower)
		, _upper (upper)
		, _normal (initial)
	{}

	/* Controllable API */

	void set_value (double v, PBD::Controllable::GroupControlDisposition gcd) {
		T newval = (T) v;
		if (newval != _value) {
			_value = std::max (_lower, std::min (_upper, newval));
			Changed (true, gcd); /* EMIT SIGNAL */
		}
	}

	double get_value () const {
		return (float) _value;
	}

	std::string get_user_string () const
	{
		char theBuf[32]; sprintf( theBuf, "%3.1f dB", accurate_coefficient_to_dB (get_value()));
		return std::string(theBuf);
	}

	double lower () const { return _lower; }
	double upper () const { return _upper; }
	double normal () const { return _normal; }

	/* "access as T" API */

	MPControl& operator=(const T& v) {
		if (v != _value) {
			_value = std::max (_lower, std::min (_upper, v));
			Changed (true, PBD::Controllable::UseGroup); /* EMIT SIGNAL */
		}
		return *this;
	}

	bool operator==(const T& v) const {
		return _value == v;
	}

	bool operator<(const T& v) const {
		return _value < v;
	}

	bool operator<=(const T& v) const {
		return _value <= v;
	}

	bool operator>(const T& v) const {
		return _value > v;
	}

	bool operator>=(const T& v) const {
		return _value >= v;
	}

	operator T() const { return _value; }
	T val() const { return _value; }

protected:
	T _value;
	T _lower;
	T _upper;
	T _normal;
};

template<> void MPControl<bool>::set_value (double v, PBD::Controllable::GroupControlDisposition gcd);

class LIBARDOUR_API MonitorProcessor : public Processor
{
public:
	MonitorProcessor (Session&);
	~MonitorProcessor ();

	bool display_to_user() const;

	void run (BufferSet& /*bufs*/, samplepos_t /*start_sample*/, samplepos_t /*end_sample*/, double /*speed*/, pframes_t /*nframes*/, bool /*result_required*/);

	XMLNode& state () const;
	int set_state (const XMLNode&, int /* version */);

	bool configure_io (ChanCount in, ChanCount out);
	bool can_support_io_configuration (const ChanCount& in, ChanCount& out);

	void set_cut_all (bool);
	void set_dim_all (bool);
	void set_polarity (uint32_t, bool invert);
	void set_cut (uint32_t, bool cut);
	void set_dim (uint32_t, bool dim);
	void set_solo (uint32_t, bool);
	void set_mono (bool);

	gain_t dim_level() const { return _dim_level; }
	gain_t solo_boost_level() const { return _solo_boost_level; }

	bool dimmed (uint32_t chn) const;
	bool soloed (uint32_t chn) const;
	bool inverted (uint32_t chn) const;
	bool cut (uint32_t chn) const;
	bool cut_all () const;
	bool dim_all () const;
	bool mono () const;

	bool monitor_active () const { return _monitor_active; }

	PBD::Signal0<void> Changed;

	std::shared_ptr<PBD::Controllable> channel_cut_control (uint32_t) const;
	std::shared_ptr<PBD::Controllable> channel_dim_control (uint32_t) const;
	std::shared_ptr<PBD::Controllable> channel_polarity_control (uint32_t) const;
	std::shared_ptr<PBD::Controllable> channel_solo_control (uint32_t) const;

	std::shared_ptr<PBD::Controllable> dim_control () const { return _dim_all_control; }
	std::shared_ptr<PBD::Controllable> cut_control () const { return _cut_all_control; }
	std::shared_ptr<PBD::Controllable> mono_control () const { return _mono_control; }
	std::shared_ptr<PBD::Controllable> dim_level_control () const { return _dim_level_control; }
	std::shared_ptr<PBD::Controllable> solo_boost_control () const { return _solo_boost_level_control; }

private:
	struct ChannelRecord {
		gain_t current_gain;

		/* pointers - created first, but managed by std::shared_ptr<> */

		MPControl<gain_t>* cut_ptr;
		MPControl<bool>*   dim_ptr;
		MPControl<gain_t>* polarity_ptr;
		MPControl<bool>*   soloed_ptr;

		/* shared ptr access and lifetime management, for external users */

		std::shared_ptr<PBD::Controllable> cut_control;
		std::shared_ptr<PBD::Controllable> dim_control;
		std::shared_ptr<PBD::Controllable> polarity_control;
		std::shared_ptr<PBD::Controllable> soloed_control;

		/* typed controllables for internal use */

		MPControl<gain_t>& cut;
		MPControl<bool>&   dim;
		MPControl<gain_t>& polarity;
		MPControl<bool>&   soloed;

		ChannelRecord (uint32_t);
		~ChannelRecord ();
	};

	std::vector<ChannelRecord*> _channels;

	uint32_t             solo_cnt;
	bool                 _monitor_active;


	/* pointers - created first, but managed by std::shared_ptr<> */

	MPControl<bool>*            _dim_all_ptr;
	MPControl<bool>*            _cut_all_ptr;
	MPControl<bool>*            _mono_ptr;
	MPControl<volatile gain_t>* _dim_level_ptr;
	MPControl<volatile gain_t>* _solo_boost_level_ptr;

	/* shared ptr access and lifetime management, for external users */

	std::shared_ptr<PBD::Controllable> _dim_all_control;
	std::shared_ptr<PBD::Controllable> _cut_all_control;
	std::shared_ptr<PBD::Controllable> _mono_control;
	std::shared_ptr<PBD::Controllable> _dim_level_control;
	std::shared_ptr<PBD::Controllable> _solo_boost_level_control;

	/* typed controllables for internal use */

	MPControl<bool>&            _dim_all;
	MPControl<bool>&            _cut_all;
	MPControl<bool>&            _mono;
	MPControl<volatile gain_t>& _dim_level;
	MPControl<volatile gain_t>& _solo_boost_level;

	void allocate_channels (uint32_t);
	void update_monitor_state ();
};

} /* namespace */

#endif /* __ardour_monitor_processor_h__ */
