/*
 * 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.
 */

/** \file
 * \ingroup modifiers
 */

#include "BLI_utildefines.h"

#include "DNA_mesh_types.h"
#include "DNA_object_types.h"

#include "BKE_deform.h"
#include "BKE_mesh.h"

#include "MOD_modifiertypes.h"

#include "bmesh.h"
#include "tools/bmesh_wireframe.h"

static void initData(ModifierData *md)
{
  WireframeModifierData *wmd = (WireframeModifierData *)md;
  wmd->offset = 0.02f;
  wmd->flag = MOD_WIREFRAME_REPLACE | MOD_WIREFRAME_OFS_EVEN;
  wmd->crease_weight = 1.0f;
}

static void requiredDataMask(Object *UNUSED(ob),
                             ModifierData *md,
                             CustomData_MeshMasks *r_cddata_masks)
{
  WireframeModifierData *wmd = (WireframeModifierData *)md;

  /* ask for vertexgroups if we need them */
  if (wmd->defgrp_name[0] != '\0') {
    r_cddata_masks->vmask |= CD_MASK_MDEFORMVERT;
  }
}

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

static Mesh *WireframeModifier_do(WireframeModifierData *wmd, Object *ob, Mesh *mesh)
{
  Mesh *result;
  BMesh *bm;

  const int defgrp_index = BKE_object_defgroup_name_index(ob, wmd->defgrp_name);

  bm = BKE_mesh_to_bmesh_ex(mesh,
                            &(struct BMeshCreateParams){0},
                            &(struct BMeshFromMeshParams){
                                .calc_face_normal = true,
                                .add_key_index = false,
                                .use_shapekey = false,
                                .active_shapekey = 0,
                                .cd_mask_extra = {.vmask = CD_MASK_ORIGINDEX,
                                                  .emask = CD_MASK_ORIGINDEX,
                                                  .pmask = CD_MASK_ORIGINDEX},
                            });

  BM_mesh_wireframe(bm,
                    wmd->offset,
                    wmd->offset_fac,
                    wmd->offset_fac_vg,
                    (wmd->flag & MOD_WIREFRAME_REPLACE) != 0,
                    (wmd->flag & MOD_WIREFRAME_BOUNDARY) != 0,
                    (wmd->flag & MOD_WIREFRAME_OFS_EVEN) != 0,
                    (wmd->flag & MOD_WIREFRAME_OFS_RELATIVE) != 0,
                    (wmd->flag & MOD_WIREFRAME_CREASE) != 0,
                    wmd->crease_weight,
                    defgrp_index,
                    (wmd->flag & MOD_WIREFRAME_INVERT_VGROUP) != 0,
                    wmd->mat_ofs,
                    MAX2(ob->totcol - 1, 0),
                    false);

  result = BKE_mesh_from_bmesh_for_eval_nomain(bm, NULL, mesh);
  BM_mesh_free(bm);

  result->runtime.cd_dirty_vert |= CD_MASK_NORMAL;

  return result;
}

static Mesh *modifyMesh(ModifierData *md, const struct ModifierEvalContext *ctx, struct Mesh *mesh)
{
  return WireframeModifier_do((WireframeModifierData *)md, ctx->object, mesh);
}

ModifierTypeInfo modifierType_Wireframe = {
    /* name */ "Wireframe",
    /* structName */ "WireframeModifierData",
    /* structSize */ sizeof(WireframeModifierData),
    /* type */ eModifierTypeType_Constructive,
    /* flags */ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsEditmode,

    /* copyData */ BKE_modifier_copydata_generic,

    /* deformVerts */ NULL,
    /* deformMatrices */ NULL,
    /* deformVertsEM */ NULL,
    /* deformMatricesEM */ NULL,
    /* modifyMesh */ modifyMesh,
    /* modifyHair */ NULL,
    /* modifyPointCloud */ NULL,
    /* modifyVolume */ NULL,

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