/*
 * 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.
 *
 * The Original Code is Copyright (C) 2005 by the Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup modifiers
 */

#include "BLI_utildefines.h"

#include "DNA_mesh_types.h"
#include "DNA_scene_types.h"
#include "DNA_object_fluidsim_types.h"
#include "DNA_object_types.h"

#include "BKE_layer.h"
#include "BKE_modifier.h"

#include "DEG_depsgraph_build.h"

#include "MOD_fluidsim_util.h"
#include "MOD_modifiertypes.h"

#include "MEM_guardedalloc.h"

/* Fluidsim */
static void initData(ModifierData *md)
{
  FluidsimModifierData *fluidmd = (FluidsimModifierData *)md;

  fluidsim_init(fluidmd);
}
static void freeData(ModifierData *md)
{
  FluidsimModifierData *fluidmd = (FluidsimModifierData *)md;

  fluidsim_free(fluidmd);
}

static void copyData(const ModifierData *md, ModifierData *target, const int UNUSED(flag))
{
  const FluidsimModifierData *fluidmd = (const FluidsimModifierData *)md;
  FluidsimModifierData *tfluidmd = (FluidsimModifierData *)target;

  /* Free any FSS that was allocated in initData() */
  if (tfluidmd->fss) {
    MEM_SAFE_FREE(tfluidmd->fss->meshVelocities);
    MEM_freeN(tfluidmd->fss);
  }

  if (fluidmd->fss == NULL) {
    tfluidmd->fss = NULL;
    return;
  }

  tfluidmd->fss = MEM_dupallocN(fluidmd->fss);
  if (tfluidmd->fss->meshVelocities != NULL) {
    tfluidmd->fss->meshVelocities = MEM_dupallocN(tfluidmd->fss->meshVelocities);
  }
}

static Mesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx, Mesh *mesh)
{
  FluidsimModifierData *fluidmd = (FluidsimModifierData *)md;
  Mesh *result = NULL;

  /* check for alloc failing */
  if (!fluidmd->fss) {
    initData(md);

    if (!fluidmd->fss) {
      return mesh;
    }
  }

  result = fluidsimModifier_do(fluidmd, ctx, mesh);

  return result ? result : mesh;
}

static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
{
  FluidsimModifierData *fluidmd = (FluidsimModifierData *)md;
  if (fluidmd && fluidmd->fss) {
    if (fluidmd->fss->type == OB_FLUIDSIM_DOMAIN) {
      FOREACH_SCENE_OBJECT_BEGIN (ctx->scene, ob1) {
        if (ob1 != ctx->object) {
          FluidsimModifierData *fluidmdtmp = (FluidsimModifierData *)modifiers_findByType(
              ob1, eModifierType_Fluidsim);

          /* Only put dependencies from NON-DOMAIN fluids in here. */
          if (fluidmdtmp && fluidmdtmp->fss && (fluidmdtmp->fss->type != OB_FLUIDSIM_DOMAIN)) {
            DEG_add_object_relation(ctx->node, ob1, DEG_OB_COMP_TRANSFORM, "Fluidsim Object");
          }
        }
      }
      FOREACH_SCENE_OBJECT_END;
    }
  }
}

static bool dependsOnTime(ModifierData *UNUSED(md))
{
  return true;
}

ModifierTypeInfo modifierType_Fluidsim = {
    /* name */ "Fluidsim",
    /* structName */ "FluidsimModifierData",
    /* structSize */ sizeof(FluidsimModifierData),
    /* type */ eModifierTypeType_Nonconstructive,

    /* flags */ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_RequiresOriginalData |
        eModifierTypeFlag_Single,

    /* copyData */ copyData,

    /* deformVerts */ NULL,
    /* deformMatrices */ NULL,
    /* deformVertsEM */ NULL,
    /* deformMatricesEM */ NULL,
    /* applyModifier */ applyModifier,

    /* initData */ initData,
    /* requiredDataMask */ NULL,
    /* freeData */ freeData,
    /* isDisabled */ NULL,
    /* updateDepsgraph */ updateDepsgraph,
    /* dependsOnTime */ dependsOnTime,
    /* dependsOnNormals */ NULL,
    /* foreachObjectLink */ NULL,
    /* foreachIDLink */ NULL,
    /* foreachTexLink */ NULL,
    /* freeRuntimeData */ NULL,
};