/*
 * 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 <stdio.h>

#include "BLI_utildefines.h"

#include "BLT_translation.h"

#include "DNA_mesh_types.h"
#include "DNA_object_force_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"

#include "BKE_context.h"
#include "BKE_layer.h"
#include "BKE_particle.h"
#include "BKE_screen.h"
#include "BKE_softbody.h"

#include "UI_interface.h"
#include "UI_resources.h"

#include "RNA_access.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"
#include "DEG_depsgraph_physics.h"
#include "DEG_depsgraph_query.h"

#include "MOD_modifiertypes.h"
#include "MOD_ui_common.h"

static void deformVerts(ModifierData *UNUSED(md),
                        const ModifierEvalContext *ctx,
                        Mesh *UNUSED(derivedData),
                        float (*vertexCos)[3],
                        int numVerts)
{
  Scene *scene = DEG_get_evaluated_scene(ctx->depsgraph);
  sbObjectStep(
      ctx->depsgraph, scene, ctx->object, DEG_get_ctime(ctx->depsgraph), vertexCos, numVerts);
}

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

static void updateDepsgraph(ModifierData *UNUSED(md), const ModifierUpdateDepsgraphContext *ctx)
{
  if (ctx->object->soft) {
    /* Actual code uses ccd_build_deflector_hash */
    DEG_add_collision_relations(ctx->node,
                                ctx->object,
                                ctx->object->soft->collision_group,
                                eModifierType_Collision,
                                NULL,
                                "Softbody Collision");
    DEG_add_forcefield_relations(
        ctx->node, ctx->object, ctx->object->soft->effector_weights, true, 0, "Softbody Field");
  }
  /* We need own transformation as well. */
  DEG_add_modifier_to_transform_relation(ctx->node, "SoftBody Modifier");
}

static void panel_draw(const bContext *UNUSED(C), Panel *panel)
{
  uiLayout *layout = panel->layout;

  PointerRNA *ptr = modifier_panel_get_property_pointers(panel, NULL);

  uiItemL(layout, IFACE_("Settings are inside the Physics tab"), ICON_NONE);

  modifier_panel_end(layout, ptr);
}

static void panelRegister(ARegionType *region_type)
{
  modifier_panel_register(region_type, eModifierType_Softbody, panel_draw);
}

ModifierTypeInfo modifierType_Softbody = {
    /* name */ "Softbody",
    /* structName */ "SoftbodyModifierData",
    /* structSize */ sizeof(SoftbodyModifierData),
    /* srna */ &RNA_SoftBodyModifier,
    /* type */ eModifierTypeType_OnlyDeform,
    /* flags */ eModifierTypeFlag_AcceptsCVs | eModifierTypeFlag_AcceptsVertexCosOnly |
        eModifierTypeFlag_RequiresOriginalData | eModifierTypeFlag_Single |
        eModifierTypeFlag_UsesPointCache,
    /* icon */ ICON_MOD_SOFT,

    /* copyData */ NULL,

    /* deformVerts */ deformVerts,
    /* deformMatrices */ NULL,
    /* deformVertsEM */ NULL,
    /* deformMatricesEM */ NULL,
    /* modifyMesh */ NULL,
    /* modifyHair */ NULL,
    /* modifyGeometrySet */ NULL,

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