/* SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup modifiers
 */

#include <cstring>

#include "BLI_utildefines.h"

#include "BLT_translation.h"

#include "DNA_defaults.h"
#include "DNA_mesh_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"

#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_mesh.h"
#include "BKE_screen.h"

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

#include "RNA_access.h"
#include "RNA_prototypes.h"

#include "MOD_modifiertypes.hh"
#include "MOD_ui_common.hh"

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

static void initData(ModifierData *md)
{
  WireframeModifierData *wmd = (WireframeModifierData *)md;

  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(wmd, modifier));

  MEMCPY_STRUCT_AFTER(wmd, DNA_struct_default_get(WireframeModifierData), modifier);
}

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

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

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

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

  const int defgrp_index = BKE_id_defgroup_name_index(&mesh->id, wmd->defgrp_name);

  BMeshCreateParams create_params{};
  BMeshFromMeshParams convert_params{};
  convert_params.calc_face_normal = true;
  convert_params.calc_vert_normal = true;
  convert_params.add_key_index = false;
  convert_params.use_shapekey = false;
  convert_params.active_shapekey = 0;
  convert_params.cd_mask_extra.vmask = CD_MASK_ORIGINDEX;
  convert_params.cd_mask_extra.emask = CD_MASK_ORIGINDEX;
  convert_params.cd_mask_extra.pmask = CD_MASK_ORIGINDEX;

  bm = BKE_mesh_to_bmesh_ex(mesh, &create_params, &convert_params);

  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, nullptr, mesh);
  BM_mesh_free(bm);

  return result;
}

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

static void panel_draw(const bContext * /*C*/, Panel *panel)
{
  uiLayout *col, *row, *sub;
  uiLayout *layout = panel->layout;

  PointerRNA ob_ptr;
  PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);

  uiLayoutSetPropSep(layout, true);

  uiItemR(layout, ptr, "thickness", 0, IFACE_("Thickness"), ICON_NONE);
  uiItemR(layout, ptr, "offset", 0, nullptr, ICON_NONE);

  col = uiLayoutColumn(layout, true);
  uiItemR(col, ptr, "use_boundary", 0, IFACE_("Boundary"), ICON_NONE);
  uiItemR(col, ptr, "use_replace", 0, IFACE_("Replace Original"), ICON_NONE);

  col = uiLayoutColumnWithHeading(layout, true, IFACE_("Thickness"));
  uiItemR(col, ptr, "use_even_offset", 0, IFACE_("Even"), ICON_NONE);
  uiItemR(col, ptr, "use_relative_offset", 0, IFACE_("Relative"), ICON_NONE);

  row = uiLayoutRowWithHeading(layout, true, IFACE_("Crease Edges"));
  uiItemR(row, ptr, "use_crease", 0, "", ICON_NONE);
  sub = uiLayoutRow(row, true);
  uiLayoutSetActive(sub, RNA_boolean_get(ptr, "use_crease"));
  uiItemR(sub, ptr, "crease_weight", UI_ITEM_R_SLIDER, "", ICON_NONE);

  uiItemR(layout, ptr, "material_offset", 0, IFACE_("Material Offset"), ICON_NONE);

  modifier_panel_end(layout, ptr);
}

static void vertex_group_panel_draw(const bContext * /*C*/, Panel *panel)
{
  uiLayout *row;
  uiLayout *layout = panel->layout;

  PointerRNA ob_ptr;
  PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);

  bool has_vertex_group = RNA_string_length(ptr, "vertex_group") != 0;

  uiLayoutSetPropSep(layout, true);

  modifier_vgroup_ui(layout, ptr, &ob_ptr, "vertex_group", "invert_vertex_group", nullptr);

  row = uiLayoutRow(layout, true);
  uiLayoutSetActive(row, has_vertex_group);
  uiItemR(row, ptr, "thickness_vertex_group", 0, IFACE_("Factor"), ICON_NONE);
}

static void panelRegister(ARegionType *region_type)
{
  PanelType *panel_type = modifier_panel_register(
      region_type, eModifierType_Wireframe, panel_draw);
  modifier_subpanel_register(
      region_type, "vertex_group", "Vertex Group", nullptr, vertex_group_panel_draw, panel_type);
}

ModifierTypeInfo modifierType_Wireframe = {
    /*name*/ N_("Wireframe"),
    /*structName*/ "WireframeModifierData",
    /*structSize*/ sizeof(WireframeModifierData),
    /*srna*/ &RNA_WireframeModifier,
    /*type*/ eModifierTypeType_Constructive,
    /*flags*/ eModifierTypeFlag_AcceptsMesh | eModifierTypeFlag_SupportsEditmode,
    /*icon*/ ICON_MOD_WIREFRAME,

    /*copyData*/ BKE_modifier_copydata_generic,

    /*deformVerts*/ nullptr,
    /*deformMatrices*/ nullptr,
    /*deformVertsEM*/ nullptr,
    /*deformMatricesEM*/ nullptr,
    /*modifyMesh*/ modifyMesh,
    /*modifyGeometrySet*/ nullptr,

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