/*
 * Copyright (C) 2011-2015 Paul Davis <paul@linuxaudiosystems.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 __libardour_vbap_speakers_h__
#define __libardour_vbap_speakers_h__

#include <string>
#include <vector>

#include <pbd/signals.h>

#include "ardour/panner.h"
#include "ardour/speakers.h"

namespace ARDOUR
{
class Speakers;

class VBAPSpeakers
{
public:
	VBAPSpeakers (std::shared_ptr<Speakers>);
	VBAPSpeakers (const VBAPSpeakers&) = delete;
	VBAPSpeakers& operator= (const VBAPSpeakers&) = delete;

	typedef std::vector<double> dvector;

	const dvector matrix (int tuple) const
	{
		return _matrices[tuple];
	}

	int speaker_for_tuple (int tuple, int which) const
	{
		return _speaker_tuples[tuple][which];
	}

	int n_tuples () const
	{
		return _matrices.size ();
	}

	int dimension () const
	{
		return _dimension;
	}

	uint32_t n_speakers () const
	{
		return _speakers.size ();
	}

	std::shared_ptr<Speakers> parent () const
	{
		return _parent;
	}

	~VBAPSpeakers ();

private:
	static const double         MIN_VOL_P_SIDE_LGTH;
	int                         _dimension;
	std::shared_ptr<Speakers> _parent;
	std::vector<Speaker>        _speakers;
	PBD::ScopedConnection       speaker_connection;

	struct azimuth_sorter {
		bool operator() (const Speaker& s1, const Speaker& s2)
		{
			return s1.angles ().azi < s2.angles ().azi;
		}
	};

	struct twoDmatrix : public dvector {
		twoDmatrix () : dvector (4, 0.0) { }
	};

	struct threeDmatrix : public dvector {
		threeDmatrix () : dvector (9, 0.0) { }
	};

	struct tmatrix : public dvector {
		tmatrix () : dvector (3, 0.0) { }
	};

	std::vector<dvector> _matrices;       /* holds matrices for a given speaker combinations */
	std::vector<tmatrix> _speaker_tuples; /* holds speakers IDs for a given combination */

	/* A struct for all loudspeakers */
	struct ls_triplet_chain {
		int                      ls_nos[3];
		float                    inv_mx[9];
		struct ls_triplet_chain* next;
	};

	static double vec_angle (PBD::CartesianVector v1, PBD::CartesianVector v2);
	static double vec_length (PBD::CartesianVector v1);
	static double vec_prod (PBD::CartesianVector v1, PBD::CartesianVector v2);
	static double vol_p_side_lgth (int i, int j, int k, const std::vector<Speaker>&);
	static void   cross_prod (PBD::CartesianVector v1, PBD::CartesianVector v2, PBD::CartesianVector* res);

	void update ();
	int  any_ls_inside_triplet (int a, int b, int c);
	void add_ldsp_triplet (int i, int j, int k, struct ls_triplet_chain** ls_triplets);
	int  lines_intersect (int i, int j, int k, int l);
	void calculate_3x3_matrixes (struct ls_triplet_chain* ls_triplets);
	void choose_speaker_triplets (struct ls_triplet_chain** ls_triplets);
	void choose_speaker_pairs ();
	void sort_2D_lss (int* sorted_lss);
	int  calc_2D_inv_tmatrix (double azi1, double azi2, double* inv_mat);
};

} // namespace ARDOUR

#endif /* __libardour_vbap_speakers_h__ */