/*
 * 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 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup modifiers
 */

#include <string.h>

#include "BLI_utildefines.h"

#include "BLI_bitmap.h"
#include "BLI_math_vector.h"
#include "BLI_math_matrix.h"

#include "DNA_image_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_mesh_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "BKE_deform.h"
#include "BKE_editmesh.h"
#include "BKE_image.h"
#include "BKE_lattice.h"
#include "BKE_library.h"
#include "BKE_mesh.h"
#include "BKE_object.h"

#include "BKE_modifier.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"

#include "MOD_util.h"
#include "MOD_modifiertypes.h"

#include "MEM_guardedalloc.h"

#include "bmesh.h"

void MOD_init_texture(MappingInfoModifierData *dmd, const ModifierEvalContext *ctx)
{
  Tex *tex = dmd->texture;

  if (tex == NULL) {
    return;
  }

  if (tex->ima && BKE_image_is_animated(tex->ima)) {
    BKE_image_user_frame_calc(tex->ima, &tex->iuser, DEG_get_ctime(ctx->depsgraph));
  }
}

/* TODO to be renamed to get_texture_coords once we are done with moving modifiers to Mesh. */
/** \param cos: may be NULL, in which case we use directly mesh vertices' coordinates. */
void MOD_get_texture_coords(MappingInfoModifierData *dmd,
                            const ModifierEvalContext *UNUSED(ctx),
                            Object *ob,
                            Mesh *mesh,
                            float (*cos)[3],
                            float (*r_texco)[3])
{
  const int numVerts = mesh->totvert;
  int i;
  int texmapping = dmd->texmapping;
  float mapob_imat[4][4];

  if (texmapping == MOD_DISP_MAP_OBJECT) {
    if (dmd->map_object != NULL) {
      Object *map_object = dmd->map_object;
      invert_m4_m4(mapob_imat, map_object->obmat);
    }
    else { /* if there is no map object, default to local */
      texmapping = MOD_DISP_MAP_LOCAL;
    }
  }

  /* UVs need special handling, since they come from faces */
  if (texmapping == MOD_DISP_MAP_UV) {
    if (CustomData_has_layer(&mesh->ldata, CD_MLOOPUV)) {
      MPoly *mpoly = mesh->mpoly;
      MPoly *mp;
      MLoop *mloop = mesh->mloop;
      BLI_bitmap *done = BLI_BITMAP_NEW(numVerts, __func__);
      const int numPolys = mesh->totpoly;
      char uvname[MAX_CUSTOMDATA_LAYER_NAME];
      MLoopUV *mloop_uv;

      CustomData_validate_layer_name(&mesh->ldata, CD_MLOOPUV, dmd->uvlayer_name, uvname);
      mloop_uv = CustomData_get_layer_named(&mesh->ldata, CD_MLOOPUV, uvname);

      /* verts are given the UV from the first face that uses them */
      for (i = 0, mp = mpoly; i < numPolys; ++i, ++mp) {
        unsigned int fidx = mp->totloop - 1;

        do {
          unsigned int lidx = mp->loopstart + fidx;
          unsigned int vidx = mloop[lidx].v;

          if (!BLI_BITMAP_TEST(done, vidx)) {
            /* remap UVs from [0, 1] to [-1, 1] */
            r_texco[vidx][0] = (mloop_uv[lidx].uv[0] * 2.0f) - 1.0f;
            r_texco[vidx][1] = (mloop_uv[lidx].uv[1] * 2.0f) - 1.0f;
            BLI_BITMAP_ENABLE(done, vidx);
          }

        } while (fidx--);
      }

      MEM_freeN(done);
      return;
    }
    else {
      /* if there are no UVs, default to local */
      texmapping = MOD_DISP_MAP_LOCAL;
    }
  }

  MVert *mv = mesh->mvert;
  for (i = 0; i < numVerts; ++i, ++mv, ++r_texco) {
    switch (texmapping) {
      case MOD_DISP_MAP_LOCAL:
        copy_v3_v3(*r_texco, cos != NULL ? *cos : mv->co);
        break;
      case MOD_DISP_MAP_GLOBAL:
        mul_v3_m4v3(*r_texco, ob->obmat, cos != NULL ? *cos : mv->co);
        break;
      case MOD_DISP_MAP_OBJECT:
        mul_v3_m4v3(*r_texco, ob->obmat, cos != NULL ? *cos : mv->co);
        mul_m4_v3(mapob_imat, *r_texco);
        break;
    }
    if (cos != NULL) {
      cos++;
    }
  }
}

void MOD_previous_vcos_store(ModifierData *md, float (*vertexCos)[3])
{
  while ((md = md->next) && md->type == eModifierType_Armature) {
    ArmatureModifierData *amd = (ArmatureModifierData *)md;
    if (amd->multi && amd->prevCos == NULL) {
      amd->prevCos = MEM_dupallocN(vertexCos);
    }
    else {
      break;
    }
  }
  /* lattice/mesh modifier too */
}

/* returns a mesh if mesh == NULL, for deforming modifiers that need it */
Mesh *MOD_deform_mesh_eval_get(Object *ob,
                               struct BMEditMesh *em,
                               Mesh *mesh,
                               float (*vertexCos)[3],
                               const int num_verts,
                               const bool use_normals,
                               const bool use_orco)
{
  if (mesh != NULL) {
    /* pass */
  }
  else if (ob->type == OB_MESH) {
    if (em) {
      mesh = BKE_mesh_from_bmesh_for_eval_nomain(em->bm, NULL);
    }
    else {
      /* TODO(sybren): after modifier conversion of DM to Mesh is done, check whether
       * we really need a copy here. Maybe the CoW ob->data can be directly used. */
      Mesh *mesh_prior_modifiers = BKE_object_get_pre_modified_mesh(ob);
      BKE_id_copy_ex(NULL,
                     &mesh_prior_modifiers->id,
                     (ID **)&mesh,
                     (LIB_ID_COPY_LOCALIZE | LIB_ID_COPY_CD_REFERENCE));
      mesh->runtime.deformed_only = 1;
    }

    /* TODO(sybren): after modifier conversion of DM to Mesh is done, check whether
     * we really need vertexCos here. */
    if (vertexCos) {
      BKE_mesh_apply_vert_coords(mesh, vertexCos);
      mesh->runtime.cd_dirty_vert |= CD_MASK_NORMAL;
    }

    if (use_orco) {
      CustomData_add_layer(
          &mesh->vdata, CD_ORCO, CD_ASSIGN, BKE_mesh_orco_verts_get(ob), mesh->totvert);
    }
  }
  else if (ELEM(ob->type, OB_FONT, OB_CURVE, OB_SURF)) {
    /* TODO(sybren): get evaluated mesh from depsgraph once
     * that's properly generated for curves. */
    mesh = BKE_mesh_new_nomain_from_curve(ob);

    /* Currently, that may not be the case everytime
     * (texts e.g. tend to give issues,
     * also when deforming curve points instead of generated curve geometry... ). */
    if (mesh != NULL && mesh->totvert != num_verts) {
      BKE_id_free(NULL, mesh);
      mesh = NULL;
    }
  }

  if (use_normals) {
    if (LIKELY(mesh)) {
      BKE_mesh_ensure_normals(mesh);
    }
  }

  BLI_assert(mesh == NULL || mesh->totvert == num_verts);

  return mesh;
}

void MOD_get_vgroup(
    Object *ob, struct Mesh *mesh, const char *name, MDeformVert **dvert, int *defgrp_index)
{
  *defgrp_index = defgroup_name_index(ob, name);
  *dvert = NULL;

  if (*defgrp_index != -1) {
    if (ob->type == OB_LATTICE) {
      *dvert = BKE_lattice_deform_verts_get(ob);
    }
    else if (mesh) {
      *dvert = mesh->dvert;
    }
  }
}

/* only called by BKE_modifier.h/modifier.c */
void modifier_type_init(ModifierTypeInfo *types[])
{
#define INIT_TYPE(typeName) (types[eModifierType_##typeName] = &modifierType_##typeName)
  INIT_TYPE(None);
  INIT_TYPE(Curve);
  INIT_TYPE(Lattice);
  INIT_TYPE(Subsurf);
  INIT_TYPE(Build);
  INIT_TYPE(Array);
  INIT_TYPE(Mirror);
  INIT_TYPE(EdgeSplit);
  INIT_TYPE(Bevel);
  INIT_TYPE(Displace);
  INIT_TYPE(UVProject);
  INIT_TYPE(Decimate);
  INIT_TYPE(Smooth);
  INIT_TYPE(Cast);
  INIT_TYPE(Wave);
  INIT_TYPE(Armature);
  INIT_TYPE(Hook);
  INIT_TYPE(Softbody);
  INIT_TYPE(Cloth);
  INIT_TYPE(Collision);
  INIT_TYPE(Boolean);
  INIT_TYPE(MeshDeform);
  INIT_TYPE(Ocean);
  INIT_TYPE(ParticleSystem);
  INIT_TYPE(ParticleInstance);
  INIT_TYPE(Explode);
  INIT_TYPE(Shrinkwrap);
  INIT_TYPE(Fluidsim);
  INIT_TYPE(Mask);
  INIT_TYPE(SimpleDeform);
  INIT_TYPE(Multires);
  INIT_TYPE(Surface);
  INIT_TYPE(Smoke);
  INIT_TYPE(ShapeKey);
  INIT_TYPE(Solidify);
  INIT_TYPE(Screw);
  INIT_TYPE(Warp);
  INIT_TYPE(WeightVGEdit);
  INIT_TYPE(WeightVGMix);
  INIT_TYPE(WeightVGProximity);
  INIT_TYPE(DynamicPaint);
  INIT_TYPE(Remesh);
  INIT_TYPE(Skin);
  INIT_TYPE(LaplacianSmooth);
  INIT_TYPE(Triangulate);
  INIT_TYPE(UVWarp);
  INIT_TYPE(MeshCache);
  INIT_TYPE(LaplacianDeform);
  INIT_TYPE(Wireframe);
  INIT_TYPE(DataTransfer);
  INIT_TYPE(NormalEdit);
  INIT_TYPE(CorrectiveSmooth);
  INIT_TYPE(MeshSequenceCache);
  INIT_TYPE(SurfaceDeform);
  INIT_TYPE(WeightedNormal);
#undef INIT_TYPE
}
