/********************************************************
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 *  ╚═════╝  ╚═════╝   ╚═╝   ╚══════╝
 * Geophysical Computational Tools & Library (GCTL)
 *
 * Copyright (c) 2022  Yi Zhang (yizhang-geo@zju.edu.cn)
 *
 * GCTL is distributed under a dual licensing scheme. You can redistribute 
 * it and/or modify it under the terms of the GNU Lesser General Public 
 * License as published by the Free Software Foundation, either version 2 
 * of the License, or (at your option) any later version. You should have 
 * received a copy of the GNU Lesser General Public License along with this 
 * program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * If the terms and conditions of the LGPL v.2. would prevent you from using 
 * the GCTL, please consider the option to obtain a commercial license for a 
 * fee. These licenses are offered by the GCTL's original author. As a rule, 
 * licenses are provided "as-is", unlimited in time for a one time fee. Please 
 * send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget 
 * to include some description of your company and the realm of its activities. 
 * Also add information on how to contact you by electronic and paper mail.
 ******************************************************/

#ifndef _GCTL_MAG_KERNEL_TRICONE_H
#define _GCTL_MAG_KERNEL_TRICONE_H

#include "gm_data.h"

namespace gctl
{
    struct magcone_para
	{
        point3dc B; ///< 磁化强度矢量 directional magnetizations
		tensor F[4]; ///< tensor products of four facets
		tensor E[12]; ///< tensor products of six edges
		double edglen[12]; ///< edge lengths of six edges
	};

	typedef type_tricone<magcone_para> magcone; ///< 带magcone_para属性的三角锥结构体

	/**
     * @brief Calculate the magnetic parameters of given tricone elements.
     * 
     * @param in_tet Input and output elements
     * @param out_para Output parameters
     * @param mag_B magnetization vecrtors
     */
    void callink_magnetic_para(array<magcone> &in_cone, array<magcone_para> &out_para, const array<point3dc> &mag_B);

    /**
	 * @brief Calculate the magnetic parameters of given tricone elements wrt. the spherical coordinates.
	 * 
	 * @note  The value of magnetic susceptibility is taken as one here. This is usefull for calculating 
	 * kernel matrix of the magnetic anomalies.
	 * 
	 * @param in_tet Input elements
	 * @param out_para Output parameters
	 * @param inclina_deg inclination angle of the magnetization vector wrt. the local Cartesian coordinates at every tricone elements
	 * @param declina_deg declination angle of the magnetization vector wrt. the local Cartesian coordinates at every tricone elements
	 * @param mag_vec Output magnetization vectors (This is useful for data visualization)
	 * @param field_tense  Tense of the Earth's magnetic field
	 */
	void callink_magnetic_para_earth_sph(array<magcone> &in_tet, array<magcone_para> &out_para, 
		double inclina_deg, double declina_deg, array<point3dc> *mag_vec = nullptr, double field_tense = GCTL_T0);

    point3dc magkernel_single(const magcone &a_ele, const point3ds &a_op, tensor *R_ptr = nullptr);

	void magkernel(matrix<double> &kernel, const array<magcone> &top_ele, const array<magcone> &btm_ele, 
		const array<point3ds> &obsp, magnetic_field_type_e comp_type = Bz, verbose_type_e verbose = FullMsg);

	void magkernel(spmat<double> &kernel, const array<magcone> &top_ele, const array<magcone> &btm_ele, 
		const array<point3ds> &obsp, double cut_angle, magnetic_field_type_e comp_type = Bz, verbose_type_e verbose = FullMsg);

    void magobser(array<point3dc> &out_obs, const array<magcone> &top_ele, const array<magcone> &btm_ele, 
		const array<point3ds> &obsp, const array<double> &sus, verbose_type_e verbose = FullMsg);
};

#endif // _GCTL_MAG_KERNEL_TRICONE_H