/*******************************************************************************
 * This file is part of SWIFT.
 * Copyright (c) 2016 Bert Vandenbroucke (bert.vandenbroucke@gmail.com)
 *
 * This program is free software: 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 3 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 Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

#ifndef SWIFT_HYDRO_SLOPE_LIMITERS_H
#define SWIFT_HYDRO_SLOPE_LIMITERS_H

#include "dimension.h"
#include "kernel_hydro.h"

#ifdef SLOPE_LIMITER_PER_FACE

#define HYDRO_SLOPE_LIMITER_FACE_IMPLEMENTATION \
  "GIZMO piecewise slope limiter (Hopkins 2015)"
#include "hydro_slope_limiters_face.h"

#else

#define HYDRO_SLOPE_LIMITER_FACE_IMPLEMENTATION "No piecewise slope limiter"

/**
 * @brief Slope limit the slopes at the interface between two particles
 *
 * @param Wi Hydrodynamic variables of particle i.
 * @param Wj Hydrodynamic variables of particle j.
 * @param dWi Difference between the hydrodynamic variables of particle i at the
 * position of particle i and at the interface position.
 * @param dWj Difference between the hydrodynamic variables of particle j at the
 * position of particle j and at the interface position.
 * @param xij_i Relative position vector of the interface w.r.t. particle i.
 * @param xij_j Relative position vector of the interface w.r.t. partilce j.
 * @param r Distance between particle i and particle j.
 */
__attribute__((always_inline)) INLINE static void hydro_slope_limit_face(
    float *Wi, float *Wj, float *dWi, float *dWj, const float *xij_i,
    const float *xij_j, float r) {}

#endif

#ifdef SLOPE_LIMITER_CELL_WIDE

#define HYDRO_SLOPE_LIMITER_CELL_IMPLEMENTATION \
  "Cell wide slope limiter (Springel 2010)"

#include "hydro_slope_limiters_cell.h"

#else

#define HYDRO_SLOPE_LIMITER_CELL_IMPLEMENTATION "No cell wide slope limiter"

/**
 * @brief Initialize variables for the cell wide slope limiter
 *
 * @param p Particle.
 */
__attribute__((always_inline)) INLINE static void hydro_slope_limit_cell_init(
    struct part *p) {}

/**
 * @brief Collect information for the cell wide slope limiter during the
 * neighbour loop
 *
 * @param pi Particle i.
 * @param pj Particle j.
 * @param r Distance between particle i and particle j.
 */
__attribute__((always_inline)) INLINE static void
hydro_slope_limit_cell_collect(struct part *pi, struct part *pj, float r) {}

/**
 * @brief Slope limit cell gradients
 *
 * @param p Particle.
 */
__attribute__((always_inline)) INLINE static void hydro_slope_limit_cell(
    struct part *p) {}

#endif

#endif /* SWIFT_HYDRO_SLOPE_LIMITERS_H */