/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup edcurve
 */

#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <cwchar>
#include <fcntl.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math_geom.h"
#include "BLI_math_matrix.h"
#include "BLI_math_vector.h"
#include "BLI_string_cursor_utf8.h"
#include "BLI_utildefines.h"

#include "DNA_curve_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_text_types.h"
#include "DNA_vfont_types.h"

#include "BKE_context.hh"
#include "BKE_curve.hh"
#include "BKE_global.hh"
#include "BKE_layer.hh"
#include "BKE_lib_id.hh"
#include "BKE_main.hh"
#include "BKE_object.hh"
#include "BKE_report.hh"
#include "BKE_vfont.hh"

#include "BLI_string_utf8.h"

#include "BLT_translation.hh"

#include "DEG_depsgraph.hh"
#include "DEG_depsgraph_query.hh"

#include "RNA_access.hh"
#include "RNA_define.hh"

#include "WM_api.hh"
#include "WM_types.hh"

#include "ED_curve.hh"
#include "ED_object.hh"
#include "ED_outliner.hh"
#include "ED_screen.hh"
#include "ED_view3d.hh"

#include "UI_interface.hh"

#include "curve_intern.hh"

#define MAXTEXT 32766

static int kill_selection(Object *obedit, int ins);
static char *font_select_to_buffer(Object *obedit);

/* -------------------------------------------------------------------- */
/** \name Internal Utilities
 * \{ */

static char32_t findaccent(char32_t char1, const char code)
{
  char32_t new_char = 0;

  if (char1 == 'a') {
    if (code == '`') {
      new_char = 224;
    }
    else if (code == 39) {
      new_char = 225;
    }
    else if (code == '^') {
      new_char = 226;
    }
    else if (code == '~') {
      new_char = 227;
    }
    else if (code == '"') {
      new_char = 228;
    }
    else if (code == 'o') {
      new_char = 229;
    }
    else if (code == 'e') {
      new_char = 230;
    }
    else if (code == '-') {
      new_char = 170;
    }
  }
  else if (char1 == 'c') {
    if (code == ',') {
      new_char = 231;
    }
    else if (code == '|') {
      new_char = 162;
    }
    else if (code == 'o') {
      new_char = 169;
    }
  }
  else if (char1 == 'e') {
    if (code == '`') {
      new_char = 232;
    }
    else if (code == 39) {
      new_char = 233;
    }
    else if (code == '^') {
      new_char = 234;
    }
    else if (code == '"') {
      new_char = 235;
    }
  }
  else if (char1 == 'i') {
    if (code == '`') {
      new_char = 236;
    }
    else if (code == 39) {
      new_char = 237;
    }
    else if (code == '^') {
      new_char = 238;
    }
    else if (code == '"') {
      new_char = 239;
    }
  }
  else if (char1 == 'n') {
    if (code == '~') {
      new_char = 241;
    }
  }
  else if (char1 == 'o') {
    if (code == '`') {
      new_char = 242;
    }
    else if (code == 39) {
      new_char = 243;
    }
    else if (code == '^') {
      new_char = 244;
    }
    else if (code == '~') {
      new_char = 245;
    }
    else if (code == '"') {
      new_char = 246;
    }
    else if (code == '/') {
      new_char = 248;
    }
    else if (code == '-') {
      new_char = 186;
    }
    else if (code == 'e') {
      new_char = 339;
    }
    else if (code == 'c') {
      new_char = 169;
    }
    else if (code == 'r') {
      new_char = 174;
    }
  }
  else if (char1 == 'r') {
    if (code == 'o') {
      new_char = 174;
    }
  }
  else if (char1 == 's') {
    if (code == 's') {
      new_char = 167;
    }
  }
  else if (char1 == 't') {
    if (code == 'm') {
      new_char = 8482;
    }
  }
  else if (char1 == 'u') {
    if (code == '`') {
      new_char = 249;
    }
    else if (code == 39) {
      new_char = 250;
    }
    else if (code == '^') {
      new_char = 251;
    }
    else if (code == '"') {
      new_char = 252;
    }
  }
  else if (char1 == 'y') {
    if (code == 39) {
      new_char = 253;
    }
    else if (code == '"') {
      new_char = 255;
    }
  }
  else if (char1 == 'A') {
    if (code == '`') {
      new_char = 192;
    }
    else if (code == 39) {
      new_char = 193;
    }
    else if (code == '^') {
      new_char = 194;
    }
    else if (code == '~') {
      new_char = 195;
    }
    else if (code == '"') {
      new_char = 196;
    }
    else if (code == 'o') {
      new_char = 197;
    }
    else if (code == 'e') {
      new_char = 198;
    }
  }
  else if (char1 == 'C') {
    if (code == ',') {
      new_char = 199;
    }
  }
  else if (char1 == 'E') {
    if (code == '`') {
      new_char = 200;
    }
    else if (code == 39) {
      new_char = 201;
    }
    else if (code == '^') {
      new_char = 202;
    }
    else if (code == '"') {
      new_char = 203;
    }
  }
  else if (char1 == 'I') {
    if (code == '`') {
      new_char = 204;
    }
    else if (code == 39) {
      new_char = 205;
    }
    else if (code == '^') {
      new_char = 206;
    }
    else if (code == '"') {
      new_char = 207;
    }
  }
  else if (char1 == 'N') {
    if (code == '~') {
      new_char = 209;
    }
  }
  else if (char1 == 'O') {
    if (code == '`') {
      new_char = 210;
    }
    else if (code == 39) {
      new_char = 211;
    }
    else if (code == '^') {
      new_char = 212;
    }
    else if (code == '~') {
      new_char = 213;
    }
    else if (code == '"') {
      new_char = 214;
    }
    else if (code == '/') {
      new_char = 216;
    }
    else if (code == 'e') {
      new_char = 141;
    }
  }
  else if (char1 == 'U') {
    if (code == '`') {
      new_char = 217;
    }
    else if (code == 39) {
      new_char = 218;
    }
    else if (code == '^') {
      new_char = 219;
    }
    else if (code == '"') {
      new_char = 220;
    }
  }
  else if (char1 == 'Y') {
    if (code == 39) {
      new_char = 221;
    }
  }
  else if (char1 == '1') {
    if (code == '4') {
      new_char = 188;
    }
    if (code == '2') {
      new_char = 189;
    }
  }
  else if (char1 == '3') {
    if (code == '4') {
      new_char = 190;
    }
  }
  else if (char1 == ':') {
    if (code == '-') {
      new_char = 247;
    }
  }
  else if (char1 == '-') {
    if (code == ':') {
      new_char = 247;
    }
    if (code == '|') {
      new_char = 8224;
    }
    if (code == '+') {
      new_char = 177;
    }
  }
  else if (char1 == '|') {
    if (code == '-') {
      new_char = 8224;
    }
    if (code == '=') {
      new_char = 8225;
    }
  }
  else if (char1 == '=') {
    if (code == '|') {
      new_char = 8225;
    }
  }
  else if (char1 == '+') {
    if (code == '-') {
      new_char = 177;
    }
  }

  if (new_char) {
    return new_char;
  }
  return char1;
}

static int insert_into_textbuf(Object *obedit, uintptr_t c)
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  if (ef->len < MAXTEXT - 1) {
    int x;

    for (x = ef->len; x > ef->pos; x--) {
      ef->textbuf[x] = ef->textbuf[x - 1];
    }
    for (x = ef->len; x > ef->pos; x--) {
      ef->textbufinfo[x] = ef->textbufinfo[x - 1];
    }
    ef->textbuf[ef->pos] = c;
    ef->textbufinfo[ef->pos] = cu->curinfo;
    ef->textbufinfo[ef->pos].kern = 0.0f;
    ef->textbufinfo[ef->pos].mat_nr = obedit->actcol - 1;

    ef->pos++;
    ef->len++;
    ef->textbuf[ef->len] = '\0';

    return 1;
  }
  return 0;
}

static void text_update_edited(bContext *C, Object *obedit, const eEditFontMode mode)
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  BLI_assert(ef->len >= 0);

  /* run update first since it can move the cursor */
  if (mode == FO_EDIT) {
    /* re-tesselllate */
    DEG_id_tag_update(static_cast<ID *>(obedit->data), 0);
  }
  else {
    /* depsgraph runs above, but since we're not tagging for update, call direct */
    /* We need evaluated data here. */
    Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
    BKE_vfont_to_curve(DEG_get_evaluated_object(depsgraph, obedit), mode);
  }

  cu->curinfo = ef->textbufinfo[ef->pos ? ef->pos - 1 : 0];

  if (obedit->totcol > 0) {
    obedit->actcol = cu->curinfo.mat_nr + 1;
    if (obedit->actcol < 1) {
      obedit->actcol = 1;
    }
  }

  DEG_id_tag_update(static_cast<ID *>(obedit->data), ID_RECALC_SELECT);
  WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
}

static int kill_selection(Object *obedit, int ins) /* ins == new character len */
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int selend, selstart, direction;
  int getfrom;

  direction = BKE_vfont_select_get(obedit, &selstart, &selend);
  if (direction) {
    int size;
    if (ef->pos >= selstart) {
      ef->pos = selstart + ins;
    }
    if ((direction == -1) && ins) {
      selstart += ins;
      selend += ins;
    }
    getfrom = selend + 1;
    size = ef->len - selend; /* This is equivalent to: `(ef->len - getfrom) + 1(null)`. */
    memmove(ef->textbuf + selstart, ef->textbuf + getfrom, sizeof(*ef->textbuf) * size);
    memmove(ef->textbufinfo + selstart, ef->textbufinfo + getfrom, sizeof(CharInfo) * size);
    ef->len -= ((selend - selstart) + 1);
    ef->selstart = ef->selend = 0;
  }

  return direction;
}

static void font_select_update_primary_clipboard(Object *obedit)
{
  if (G.background) {
    return;
  }

  if ((WM_capabilities_flag() & WM_CAPABILITY_PRIMARY_CLIPBOARD) == 0) {
    return;
  }
  char *buf = font_select_to_buffer(obedit);
  if (buf == nullptr) {
    return;
  }
  WM_clipboard_text_set(buf, true);
  MEM_freeN(buf);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Generic Paste Functions
 * \{ */

static bool font_paste_wchar(Object *obedit,
                             const char32_t *str,
                             const size_t str_len,
                             /* optional */
                             CharInfo *str_info)
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int selend, selstart;

  if (BKE_vfont_select_get(obedit, &selstart, &selend) == 0) {
    selstart = selend = 0;
  }

  /* Verify that the copy buffer => [copy buffer len] + ef->len < MAXTEXT */
  if ((ef->len + str_len) - (selend - selstart) <= MAXTEXT) {

    kill_selection(obedit, 0);

    if (str_len) {
      int size = (ef->len * sizeof(*ef->textbuf)) - (ef->pos * sizeof(*ef->textbuf)) +
                 sizeof(*ef->textbuf);
      memmove(ef->textbuf + ef->pos + str_len, ef->textbuf + ef->pos, size);
      memcpy(ef->textbuf + ef->pos, str, str_len * sizeof(*ef->textbuf));

      memmove(ef->textbufinfo + ef->pos + str_len,
              ef->textbufinfo + ef->pos,
              (ef->len - ef->pos + 1) * sizeof(CharInfo));
      if (str_info) {
        memcpy(ef->textbufinfo + ef->pos, str_info, str_len * sizeof(CharInfo));
      }
      else {
        memset(ef->textbufinfo + ef->pos, '\0', str_len * sizeof(CharInfo));
      }

      ef->len += str_len;
      ef->pos += str_len;
    }

    return true;
  }

  return false;
}

static bool font_paste_utf8(bContext *C, const char *str, const size_t str_len)
{
  Object *obedit = CTX_data_edit_object(C);
  bool retval;

  int tmplen;

  char32_t *mem = static_cast<char32_t *>(MEM_mallocN((sizeof(*mem) * (str_len + 1)), __func__));

  tmplen = BLI_str_utf8_as_utf32(mem, str, str_len + 1);

  retval = font_paste_wchar(obedit, mem, tmplen, nullptr);

  MEM_freeN(mem);

  return retval;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Generic Copy Functions
 * \{ */

static char *font_select_to_buffer(Object *obedit)
{
  int selstart, selend;
  if (!BKE_vfont_select_get(obedit, &selstart, &selend)) {
    return nullptr;
  }
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  char32_t *text_buf = ef->textbuf + selstart;
  const size_t text_buf_len = selend - selstart;

  const size_t len_utf8 = BLI_str_utf32_as_utf8_len_ex(text_buf, text_buf_len + 1);
  char *buf = static_cast<char *>(MEM_mallocN(len_utf8 + 1, __func__));
  BLI_str_utf32_as_utf8(buf, text_buf, len_utf8);
  return buf;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Paste From File Operator
 * \{ */

static int paste_from_file(bContext *C, ReportList *reports, const char *filepath)
{
  Object *obedit = CTX_data_edit_object(C);
  char *strp;
  size_t filelen;
  int retval;

  strp = static_cast<char *>(BLI_file_read_text_as_mem(filepath, 1, &filelen));
  if (strp == nullptr) {
    BKE_reportf(reports, RPT_ERROR, "Failed to open file '%s'", filepath);
    return OPERATOR_CANCELLED;
  }
  strp[filelen] = 0;

  if (font_paste_utf8(C, strp, filelen)) {
    text_update_edited(C, obedit, FO_EDIT);
    retval = OPERATOR_FINISHED;
  }
  else {
    BKE_reportf(reports, RPT_ERROR, "File too long %s", filepath);
    retval = OPERATOR_CANCELLED;
  }

  MEM_freeN(strp);

  return retval;
}

static int paste_from_file_exec(bContext *C, wmOperator *op)
{
  char *filepath;
  int retval;

  filepath = RNA_string_get_alloc(op->ptr, "filepath", nullptr, 0, nullptr);
  retval = paste_from_file(C, op->reports, filepath);
  MEM_freeN(filepath);

  return retval;
}

static int paste_from_file_invoke(bContext *C, wmOperator *op, const wmEvent * /*event*/)
{
  if (RNA_struct_property_is_set(op->ptr, "filepath")) {
    return paste_from_file_exec(C, op);
  }

  WM_event_add_fileselect(C, op);

  return OPERATOR_RUNNING_MODAL;
}

void FONT_OT_text_paste_from_file(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Paste File";
  ot->description = "Paste contents from file";
  ot->idname = "FONT_OT_text_paste_from_file";

  /* api callbacks */
  ot->exec = paste_from_file_exec;
  ot->invoke = paste_from_file_invoke;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  WM_operator_properties_filesel(ot,
                                 FILE_TYPE_FOLDER | FILE_TYPE_TEXT,
                                 FILE_SPECIAL,
                                 FILE_OPENFILE,
                                 WM_FILESEL_FILEPATH,
                                 FILE_DEFAULTDISPLAY,
                                 FILE_SORT_DEFAULT);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Insert Unicode Character
 * \{ */

static void text_insert_unicode_cancel(bContext *C, void *arg_block, void * /*arg2*/)
{
  uiBlock *block = static_cast<uiBlock *>(arg_block);
  UI_popup_block_close(C, CTX_wm_window(C), block);
}

static void text_insert_unicode_confirm(bContext *C, void *arg_block, void *arg_string)
{
  uiBlock *block = static_cast<uiBlock *>(arg_block);
  char *edit_string = static_cast<char *>(arg_string);

  if (edit_string[0] == 0) {
    /* Blank text is probably purposeful closure. */
    UI_popup_block_close(C, CTX_wm_window(C), block);
    return;
  }

  uint val = strtoul(edit_string, nullptr, 16);
  if (val > 31 && val < 0x10FFFF) {
    Object *obedit = CTX_data_edit_object(C);
    if (obedit) {
      const char32_t utf32[2] = {val, 0};
      font_paste_wchar(obedit, utf32, 1, nullptr);
      text_update_edited(C, obedit, FO_EDIT);
    }
    UI_popup_block_close(C, CTX_wm_window(C), block);
  }
  else {
    /* Invalid. Clear text and keep dialog open. */
    edit_string[0] = 0;
  }
}

static uiBlock *wm_block_insert_unicode_create(bContext *C, ARegion *region, void *arg_string)
{
  uiBlock *block = UI_block_begin(C, region, __func__, UI_EMBOSS);
  char *edit_string = static_cast<char *>(arg_string);

  UI_block_theme_style_set(block, UI_BLOCK_THEME_STYLE_POPUP);
  UI_block_flag_enable(block, UI_BLOCK_KEEP_OPEN | UI_BLOCK_NO_WIN_CLIP | UI_BLOCK_NUMSELECT);
  const uiStyle *style = UI_style_get_dpi();
  uiLayout *layout = UI_block_layout(
      block, UI_LAYOUT_VERTICAL, UI_LAYOUT_PANEL, 0, 0, 200 * UI_SCALE_FAC, UI_UNIT_Y, 0, style);

  uiItemL_ex(layout, IFACE_("Insert Unicode Character"), ICON_NONE, true, false);
  uiItemL(layout, RPT_("Enter a Unicode codepoint hex value"), ICON_NONE);

  uiBut *text_but = uiDefBut(block,
                             UI_BTYPE_TEXT,
                             0,
                             "",
                             0,
                             0,
                             100,
                             UI_UNIT_Y,
                             edit_string,
                             0,
                             7,
                             TIP_("Unicode codepoint hex value"));
  UI_but_flag_enable(text_but, UI_BUT_ACTIVATE_ON_INIT);
  /* Hitting Enter in the text input is treated the same as clicking the Confirm button. */
  UI_but_func_set(text_but, text_insert_unicode_confirm, block, edit_string);

  uiItemS(layout);

  /* Buttons. */

#ifdef _WIN32
  const bool windows_layout = true;
#else
  const bool windows_layout = false;
#endif

  uiBut *confirm = nullptr;
  uiBut *cancel = nullptr;
  uiLayout *split = uiLayoutSplit(layout, 0.0f, true);
  uiLayoutColumn(split, false);

  if (windows_layout) {
    confirm = uiDefIconTextBut(
        block, UI_BTYPE_BUT, 0, 0, "Insert", 0, 0, 0, UI_UNIT_Y, nullptr, 0, 0, nullptr);
    uiLayoutColumn(split, false);
  }

  cancel = uiDefIconTextBut(
      block, UI_BTYPE_BUT, 0, 0, "Cancel", 0, 0, 0, UI_UNIT_Y, nullptr, 0, 0, nullptr);

  if (!windows_layout) {
    uiLayoutColumn(split, false);
    confirm = uiDefIconTextBut(
        block, UI_BTYPE_BUT, 0, 0, "Insert", 0, 0, 0, UI_UNIT_Y, nullptr, 0, 0, nullptr);
  }

  UI_block_func_set(block, nullptr, nullptr, nullptr);
  UI_but_func_set(confirm, text_insert_unicode_confirm, block, edit_string);
  UI_but_func_set(cancel, text_insert_unicode_cancel, block, nullptr);
  UI_but_drawflag_disable(confirm, UI_BUT_TEXT_LEFT);
  UI_but_drawflag_disable(cancel, UI_BUT_TEXT_LEFT);
  UI_but_flag_enable(confirm, UI_BUT_ACTIVE_DEFAULT);

  int bounds_offset[2];
  bounds_offset[0] = uiLayoutGetWidth(layout) * -0.2f;
  bounds_offset[1] = UI_UNIT_Y * 2.5;
  UI_block_bounds_set_popup(block, 7 * UI_SCALE_FAC, bounds_offset);

  return block;
}

static int text_insert_unicode_invoke(bContext *C, wmOperator * /*op*/, const wmEvent * /*event*/)
{
  char *edit_string = static_cast<char *>(MEM_mallocN(24, __func__));
  edit_string[0] = 0;
  UI_popup_block_invoke_ex(C, wm_block_insert_unicode_create, edit_string, MEM_freeN, false);
  return OPERATOR_FINISHED;
}

void FONT_OT_text_insert_unicode(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Insert Unicode";
  ot->description = "Insert Unicode Character";
  ot->idname = "FONT_OT_text_insert_unicode";

  /* api callbacks */
  ot->invoke = text_insert_unicode_invoke;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Text To Object
 * \{ */

static void txt_add_object(bContext *C,
                           const TextLine *firstline,
                           int totline,
                           const float offset[3])
{
  Main *bmain = CTX_data_main(C);
  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
  Scene *scene = CTX_data_scene(C);
  ViewLayer *view_layer = CTX_data_view_layer(C);
  Curve *cu;
  Object *obedit;
  Object *object;
  const TextLine *tmp;
  int nchars = 0, nbytes = 0;
  char *s;
  int a;
  const float rot[3] = {0.0f, 0.0f, 0.0f};

  obedit = BKE_object_add(bmain, scene, view_layer, OB_FONT, nullptr);
  BKE_view_layer_synced_ensure(scene, view_layer);
  object = BKE_view_layer_active_object_get(view_layer);

  /* seems to assume view align ? TODO: look into this, could be an operator option. */
  blender::ed::object::init_transform_on_add(object, nullptr, rot);

  BKE_object_where_is_calc(depsgraph, scene, obedit);

  add_v3_v3(obedit->loc, offset);

  cu = static_cast<Curve *>(obedit->data);
  cu->vfont = BKE_vfont_builtin_get();
  id_us_plus(&cu->vfont->id);

  for (tmp = firstline, a = 0; nbytes < MAXTEXT && a < totline; tmp = tmp->next, a++) {
    size_t nchars_line, nbytes_line;
    nchars_line = BLI_strlen_utf8_ex(tmp->line, &nbytes_line);
    nchars += nchars_line + 1;
    nbytes += nbytes_line + 1;
  }

  if (cu->str) {
    MEM_freeN(cu->str);
  }
  if (cu->strinfo) {
    MEM_freeN(cu->strinfo);
  }

  cu->str = static_cast<char *>(MEM_mallocN(nbytes + 4, "str"));
  cu->strinfo = static_cast<CharInfo *>(MEM_callocN((nchars + 4) * sizeof(CharInfo), "strinfo"));

  cu->len = 0;
  cu->len_char32 = nchars - 1;
  cu->pos = 0;

  s = cu->str;

  for (tmp = firstline, a = 0; cu->len < MAXTEXT && a < totline; tmp = tmp->next, a++) {
    size_t nchars_line_dummy, nbytes_line;
    nchars_line_dummy = BLI_strlen_utf8_ex(tmp->line, &nbytes_line);
    (void)nchars_line_dummy;

    memcpy(s, tmp->line, nbytes_line);
    s += nbytes_line;
    cu->len += nbytes_line;

    if (tmp->next) {
      *s = '\n';
      s += 1;
      cu->len += 1;
    }
  }

  cu->pos = cu->len_char32;
  *s = '\0';

  WM_event_add_notifier(C, NC_OBJECT | NA_ADDED, obedit);
}

void ED_text_to_object(bContext *C, const Text *text, const bool split_lines)
{
  Main *bmain = CTX_data_main(C);
  RegionView3D *rv3d = CTX_wm_region_view3d(C);
  float offset[3];
  int linenum = 0;

  if (!text || !text->lines.first) {
    return;
  }

  if (split_lines) {
    LISTBASE_FOREACH (const TextLine *, line, &text->lines) {
      /* skip lines with no text, but still make space for them */
      if (line->line[0] == '\0') {
        linenum++;
        continue;
      }

      /* do the translation */
      offset[0] = 0;
      offset[1] = -linenum;
      offset[2] = 0;

      if (rv3d) {
        mul_mat3_m4_v3(rv3d->viewinv, offset);
      }

      txt_add_object(C, line, 1, offset);

      linenum++;
    }
  }
  else {
    offset[0] = 0.0f;
    offset[1] = 0.0f;
    offset[2] = 0.0f;

    txt_add_object(C,
                   static_cast<const TextLine *>(text->lines.first),
                   BLI_listbase_count(&text->lines),
                   offset);
  }

  DEG_relations_tag_update(bmain);
  ED_outliner_select_sync_from_object_tag(C);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Set Style Operator
 * \{ */

static const EnumPropertyItem style_items[] = {
    {CU_CHINFO_BOLD, "BOLD", 0, "Bold", ""},
    {CU_CHINFO_ITALIC, "ITALIC", 0, "Italic", ""},
    {CU_CHINFO_UNDERLINE, "UNDERLINE", 0, "Underline", ""},
    {CU_CHINFO_SMALLCAPS, "SMALL_CAPS", 0, "Small Caps", ""},
    {0, nullptr, 0, nullptr, nullptr},
};

static int set_style(bContext *C, const int style, const bool clear)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int i, selstart, selend;

  if (!BKE_vfont_select_get(obedit, &selstart, &selend)) {
    return OPERATOR_CANCELLED;
  }

  for (i = selstart; i <= selend; i++) {
    if (clear) {
      ef->textbufinfo[i].flag &= ~style;
    }
    else {
      ef->textbufinfo[i].flag |= style;
    }
  }

  DEG_id_tag_update(static_cast<ID *>(obedit->data), 0);
  WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);

  return OPERATOR_FINISHED;
}

static int set_style_exec(bContext *C, wmOperator *op)
{
  const int style = RNA_enum_get(op->ptr, "style");
  const bool clear = RNA_boolean_get(op->ptr, "clear");

  return set_style(C, style, clear);
}

void FONT_OT_style_set(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Set Style";
  ot->description = "Set font style";
  ot->idname = "FONT_OT_style_set";

  /* api callbacks */
  ot->exec = set_style_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_enum(
      ot->srna, "style", style_items, CU_CHINFO_BOLD, "Style", "Style to set selection to");
  RNA_def_boolean(ot->srna, "clear", false, "Clear", "Clear style rather than setting it");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Toggle Style Operator
 * \{ */

static int toggle_style_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  int style, clear, selstart, selend;

  style = RNA_enum_get(op->ptr, "style");
  cu->curinfo.flag ^= style;
  if (BKE_vfont_select_get(obedit, &selstart, &selend)) {
    clear = (cu->curinfo.flag & style) == 0;
    return set_style(C, style, clear);
  }
  return OPERATOR_CANCELLED;
}

void FONT_OT_style_toggle(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Toggle Style";
  ot->description = "Toggle font style";
  ot->idname = "FONT_OT_style_toggle";

  /* api callbacks */
  ot->exec = toggle_style_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_enum(
      ot->srna, "style", style_items, CU_CHINFO_BOLD, "Style", "Style to set selection to");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Select All Operator
 * \{ */

static int font_select_all_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  if (ef->len) {
    ef->selstart = 1;
    ef->selend = ef->len;
    ef->pos = ef->len;

    text_update_edited(C, obedit, FO_SELCHANGE);
    font_select_update_primary_clipboard(obedit);

    return OPERATOR_FINISHED;
  }
  return OPERATOR_CANCELLED;
}

void FONT_OT_select_all(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Select All";
  ot->description = "Select all text";
  ot->idname = "FONT_OT_select_all";

  /* api callbacks */
  ot->exec = font_select_all_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Copy Text Operator
 * \{ */

static void copy_selection(Object *obedit)
{
  int selstart, selend;

  if (BKE_vfont_select_get(obedit, &selstart, &selend)) {
    Curve *cu = static_cast<Curve *>(obedit->data);
    EditFont *ef = cu->editfont;
    char *buf = nullptr;
    char32_t *text_buf;
    size_t len_utf8;

    /* internal clipboard (for style) */
    BKE_vfont_clipboard_set(
        ef->textbuf + selstart, ef->textbufinfo + selstart, selend - selstart + 1);
    BKE_vfont_clipboard_get(&text_buf, nullptr, &len_utf8, nullptr);

    /* system clipboard */
    buf = static_cast<char *>(MEM_mallocN(len_utf8 + 1, __func__));
    if (buf) {
      BLI_str_utf32_as_utf8(buf, text_buf, len_utf8 + 1);
      WM_clipboard_text_set(buf, false);
      MEM_freeN(buf);
    }
  }
}

static int copy_text_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);

  copy_selection(obedit);

  return OPERATOR_FINISHED;
}

void FONT_OT_text_copy(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Copy Text";
  ot->description = "Copy selected text to clipboard";
  ot->idname = "FONT_OT_text_copy";

  /* api callbacks */
  ot->exec = copy_text_exec;
  ot->poll = ED_operator_editfont;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Cut Text Operator
 * \{ */

static int cut_text_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);
  int selstart, selend;

  if (!BKE_vfont_select_get(obedit, &selstart, &selend)) {
    return OPERATOR_CANCELLED;
  }

  copy_selection(obedit);
  kill_selection(obedit, 0);

  text_update_edited(C, obedit, FO_EDIT);

  return OPERATOR_FINISHED;
}

void FONT_OT_text_cut(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Cut Text";
  ot->description = "Cut selected text to clipboard";
  ot->idname = "FONT_OT_text_cut";

  /* api callbacks */
  ot->exec = cut_text_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Paste Text Operator
 * \{ */

static bool paste_selection(Object *obedit, ReportList *reports)
{
  char32_t *text_buf;
  CharInfo *info_buf;
  size_t len;

  BKE_vfont_clipboard_get(&text_buf, &info_buf, nullptr, &len);

  if (font_paste_wchar(obedit, text_buf, len, info_buf)) {
    return true;
  }

  BKE_report(reports, RPT_WARNING, "Text too long");
  return false;
}

static int paste_text_exec(bContext *C, wmOperator *op)
{
  const bool selection = RNA_boolean_get(op->ptr, "selection");
  Object *obedit = CTX_data_edit_object(C);
  int retval;
  size_t len_utf8;
  char32_t *text_buf;

  /* Store both clipboards as utf8 for comparison,
   * Give priority to the internal 'vfont' clipboard with its 'CharInfo' text styles
   * as long as its synchronized with the systems clipboard. */
  struct {
    char *buf;
    int len;
  } clipboard_system = {nullptr}, clipboard_vfont = {nullptr};

  /* No need for UTF8 validation as the conversion handles invalid sequences gracefully. */
  clipboard_system.buf = WM_clipboard_text_get(selection, false, &clipboard_system.len);

  if (clipboard_system.buf == nullptr) {
    return OPERATOR_CANCELLED;
  }

  BKE_vfont_clipboard_get(&text_buf, nullptr, &len_utf8, nullptr);

  if (text_buf) {
    clipboard_vfont.buf = static_cast<char *>(MEM_mallocN(len_utf8 + 1, __func__));

    if (clipboard_vfont.buf == nullptr) {
      MEM_freeN(clipboard_system.buf);
      return OPERATOR_CANCELLED;
    }

    BLI_str_utf32_as_utf8(clipboard_vfont.buf, text_buf, len_utf8 + 1);
  }

  if (clipboard_vfont.buf && STREQ(clipboard_vfont.buf, clipboard_system.buf)) {
    retval = paste_selection(obedit, op->reports) ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
  }
  else {
    if ((clipboard_system.len <= MAXTEXT) &&
        font_paste_utf8(C, clipboard_system.buf, clipboard_system.len))
    {
      text_update_edited(C, obedit, FO_EDIT);
      retval = OPERATOR_FINISHED;
    }
    else {
      BKE_report(op->reports, RPT_ERROR, "Clipboard too long");
      retval = OPERATOR_CANCELLED;
    }

    /* free the existent clipboard buffer */
    BKE_vfont_clipboard_free();
  }

  if (retval != OPERATOR_CANCELLED) {
    text_update_edited(C, obedit, FO_EDIT);
  }

  /* cleanup */
  if (clipboard_vfont.buf) {
    MEM_freeN(clipboard_vfont.buf);
  }

  MEM_freeN(clipboard_system.buf);

  return retval;
}

void FONT_OT_text_paste(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Paste Text";
  ot->description = "Paste text from clipboard";
  ot->idname = "FONT_OT_text_paste";

  /* api callbacks */
  ot->exec = paste_text_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  PropertyRNA *prop;
  prop = RNA_def_boolean(ot->srna,
                         "selection",
                         false,
                         "Selection",
                         "Paste text selected elsewhere rather than copied (X11/Wayland only)");
  RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Move Operator
 * \{ */

static const EnumPropertyItem move_type_items[] = {
    {LINE_BEGIN, "LINE_BEGIN", 0, "Line Begin", ""},
    {LINE_END, "LINE_END", 0, "Line End", ""},
    {TEXT_BEGIN, "TEXT_BEGIN", 0, "Text Begin", ""},
    {TEXT_END, "TEXT_END", 0, "Text End", ""},
    {PREV_CHAR, "PREVIOUS_CHARACTER", 0, "Previous Character", ""},
    {NEXT_CHAR, "NEXT_CHARACTER", 0, "Next Character", ""},
    {PREV_WORD, "PREVIOUS_WORD", 0, "Previous Word", ""},
    {NEXT_WORD, "NEXT_WORD", 0, "Next Word", ""},
    {PREV_LINE, "PREVIOUS_LINE", 0, "Previous Line", ""},
    {NEXT_LINE, "NEXT_LINE", 0, "Next Line", ""},
    {PREV_PAGE, "PREVIOUS_PAGE", 0, "Previous Page", ""},
    {NEXT_PAGE, "NEXT_PAGE", 0, "Next Page", ""},
    {0, nullptr, 0, nullptr, nullptr},
};

static int move_cursor(bContext *C, int type, const bool select)
{
  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int cursmove = -1;

  if ((select) && (ef->selstart == 0)) {
    ef->selstart = ef->selend = ef->pos + 1;
  }

  switch (type) {
    case LINE_BEGIN:
      while (ef->pos > 0) {
        if (ef->textbuf[ef->pos - 1] == '\n') {
          break;
        }
        if (ef->textbufinfo[ef->pos - 1].flag & CU_CHINFO_WRAP) {
          break;
        }
        ef->pos--;
      }
      cursmove = FO_CURS;
      break;

    case LINE_END:
      while (ef->pos < ef->len) {
        if (ef->textbuf[ef->pos] == 0) {
          break;
        }
        if (ef->textbuf[ef->pos] == '\n') {
          break;
        }
        if (ef->textbufinfo[ef->pos].flag & CU_CHINFO_WRAP) {
          break;
        }
        ef->pos++;
      }
      cursmove = FO_CURS;
      break;

    case TEXT_BEGIN:
      ef->pos = 0;
      cursmove = FO_CURS;
      break;

    case TEXT_END:
      ef->pos = ef->len;
      cursmove = FO_CURS;
      break;

    case PREV_WORD: {
      int pos = ef->pos;
      BLI_str_cursor_step_utf32(
          ef->textbuf, ef->len, &pos, STRCUR_DIR_PREV, STRCUR_JUMP_DELIM, true);
      ef->pos = pos;
      cursmove = FO_CURS;
      break;
    }

    case NEXT_WORD: {
      int pos = ef->pos;
      BLI_str_cursor_step_utf32(
          ef->textbuf, ef->len, &pos, STRCUR_DIR_NEXT, STRCUR_JUMP_DELIM, true);
      ef->pos = pos;
      cursmove = FO_CURS;
      break;
    }

    case PREV_CHAR:
      BLI_str_cursor_step_prev_utf32(ef->textbuf, ef->len, &ef->pos);
      cursmove = FO_CURS;
      break;

    case NEXT_CHAR:
      BLI_str_cursor_step_next_utf32(ef->textbuf, ef->len, &ef->pos);
      cursmove = FO_CURS;
      break;

    case PREV_LINE:
      cursmove = FO_CURSUP;
      break;

    case NEXT_LINE:
      cursmove = FO_CURSDOWN;
      break;

    case PREV_PAGE:
      cursmove = FO_PAGEUP;
      break;

    case NEXT_PAGE:
      cursmove = FO_PAGEDOWN;
      break;
  }

  if (cursmove == -1) {
    return OPERATOR_CANCELLED;
  }

  if (ef->pos > ef->len) {
    ef->pos = ef->len;
  }
  else if (ef->pos >= MAXTEXT) {
    ef->pos = MAXTEXT;
  }
  else if (ef->pos < 0) {
    ef->pos = 0;
  }

  /* apply vertical cursor motion to position immediately
   * otherwise the selection will lag behind */
  if (FO_CURS_IS_MOTION(cursmove)) {
    BKE_vfont_to_curve(DEG_get_evaluated_object(depsgraph, obedit), eEditFontMode(cursmove));
    cursmove = FO_CURS;
  }

  if (select == 0) {
    if (ef->selstart) {
      ef->selstart = ef->selend = 0;
      BKE_vfont_to_curve(DEG_get_evaluated_object(depsgraph, obedit), FO_SELCHANGE);
    }
  }

  if (select) {
    ef->selend = ef->pos;
    font_select_update_primary_clipboard(obedit);
  }

  text_update_edited(C, obedit, eEditFontMode(cursmove));

  return OPERATOR_FINISHED;
}

static int move_exec(bContext *C, wmOperator *op)
{
  int type = RNA_enum_get(op->ptr, "type");

  return move_cursor(C, type, false);
}

void FONT_OT_move(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Move Cursor";
  ot->description = "Move cursor to position type";
  ot->idname = "FONT_OT_move";

  /* api callbacks */
  ot->exec = move_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_enum(ot->srna, "type", move_type_items, LINE_BEGIN, "Type", "Where to move cursor to");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Move Select Operator
 * \{ */

static int move_select_exec(bContext *C, wmOperator *op)
{
  int type = RNA_enum_get(op->ptr, "type");

  return move_cursor(C, type, true);
}

void FONT_OT_move_select(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Move Select";
  ot->description = "Move the cursor while selecting";
  ot->idname = "FONT_OT_move_select";

  /* api callbacks */
  ot->exec = move_select_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_enum(ot->srna,
               "type",
               move_type_items,
               LINE_BEGIN,
               "Type",
               "Where to move cursor to, to make a selection");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Change Spacing
 * \{ */

static int change_spacing_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  float kern, delta = RNA_float_get(op->ptr, "delta");
  int selstart, selend;
  bool changed = false;

  const bool has_select = BKE_vfont_select_get(obedit, &selstart, &selend);
  if (has_select) {
    selstart -= 1;
  }
  else {
    selstart = selend = ef->pos - 1;
  }
  selstart = max_ii(0, selstart);

  for (int i = selstart; i <= selend; i++) {
    kern = ef->textbufinfo[i].kern + delta;

    if (ef->textbufinfo[i].kern != kern) {
      ef->textbufinfo[i].kern = kern;
      changed = true;
    }
  }

  if (changed) {
    text_update_edited(C, obedit, FO_EDIT);

    return OPERATOR_FINISHED;
  }
  return OPERATOR_CANCELLED;
}

void FONT_OT_change_spacing(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Change Spacing";
  ot->description = "Change font spacing";
  ot->idname = "FONT_OT_change_spacing";

  /* api callbacks */
  ot->exec = change_spacing_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_float(ot->srna,
                "delta",
                1.0,
                0.0,
                0.0,
                "Delta",
                "Amount to decrease or increase character spacing with",
                0.0,
                0.0);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Change Character
 * \{ */

static int change_character_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int character, delta = RNA_int_get(op->ptr, "delta");

  if (ef->pos <= 0) {
    return OPERATOR_CANCELLED;
  }

  character = ef->textbuf[ef->pos - 1];
  character += delta;
  CLAMP(character, 0, 255);

  if (character == ef->textbuf[ef->pos - 1]) {
    return OPERATOR_CANCELLED;
  }

  ef->textbuf[ef->pos - 1] = character;

  text_update_edited(C, obedit, FO_EDIT);

  return OPERATOR_FINISHED;
}

void FONT_OT_change_character(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Change Character";
  ot->description = "Change font character code";
  ot->idname = "FONT_OT_change_character";

  /* api callbacks */
  ot->exec = change_character_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_int(ot->srna,
              "delta",
              1,
              -255,
              255,
              "Delta",
              "Number to increase or decrease character code with",
              -255,
              255);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Line Break Operator
 * \{ */

static int line_break_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  insert_into_textbuf(obedit, '\n');

  ef->selstart = ef->selend = 0;

  text_update_edited(C, obedit, FO_EDIT);

  return OPERATOR_FINISHED;
}

void FONT_OT_line_break(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Line Break";
  ot->description = "Insert line break at cursor position";
  ot->idname = "FONT_OT_line_break";

  /* api callbacks */
  ot->exec = line_break_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Delete Operator
 * \{ */

static const EnumPropertyItem delete_type_items[] = {
    {DEL_NEXT_CHAR, "NEXT_CHARACTER", 0, "Next Character", ""},
    {DEL_PREV_CHAR, "PREVIOUS_CHARACTER", 0, "Previous Character", ""},
    {DEL_NEXT_WORD, "NEXT_WORD", 0, "Next Word", ""},
    {DEL_PREV_WORD, "PREVIOUS_WORD", 0, "Previous Word", ""},
    {DEL_SELECTION, "SELECTION", 0, "Selection", ""},
    {DEL_NEXT_SEL, "NEXT_OR_SELECTION", 0, "Next or Selection", ""},
    {DEL_PREV_SEL, "PREVIOUS_OR_SELECTION", 0, "Previous or Selection", ""},
    {0, nullptr, 0, nullptr, nullptr},
};

static int delete_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int selstart, selend, type = RNA_enum_get(op->ptr, "type");
  int range[2] = {0, 0};
  bool has_select = false;

  if (ef->len == 0) {
    return OPERATOR_CANCELLED;
  }

  if (BKE_vfont_select_get(obedit, &selstart, &selend)) {
    if (type == DEL_NEXT_SEL) {
      type = DEL_SELECTION;
    }
    else if (type == DEL_PREV_SEL) {
      type = DEL_SELECTION;
    }
    has_select = true;
  }
  else {
    if (type == DEL_NEXT_SEL) {
      type = DEL_NEXT_CHAR;
    }
    else if (type == DEL_PREV_SEL) {
      type = DEL_PREV_CHAR;
    }
  }

  switch (type) {
    case DEL_SELECTION:
      if (!kill_selection(obedit, 0)) {
        return OPERATOR_CANCELLED;
      }
      break;
    case DEL_PREV_CHAR:
      if (ef->pos <= 0) {
        return OPERATOR_CANCELLED;
      }

      range[1] = ef->pos;
      BLI_str_cursor_step_prev_utf32(ef->textbuf, ef->len, &ef->pos);
      range[0] = ef->pos;
      break;
    case DEL_NEXT_CHAR:
      if (ef->pos >= ef->len) {
        return OPERATOR_CANCELLED;
      }

      range[0] = ef->pos;
      range[1] = ef->pos;
      BLI_str_cursor_step_next_utf32(ef->textbuf, ef->len, &range[1]);
      break;
    case DEL_NEXT_WORD: {
      int pos = ef->pos;
      BLI_str_cursor_step_utf32(
          ef->textbuf, ef->len, &pos, STRCUR_DIR_NEXT, STRCUR_JUMP_DELIM, true);
      range[0] = ef->pos;
      range[1] = pos;
      break;
    }

    case DEL_PREV_WORD: {
      int pos = ef->pos;
      BLI_str_cursor_step_utf32(
          ef->textbuf, ef->len, &pos, STRCUR_DIR_PREV, STRCUR_JUMP_DELIM, true);
      range[0] = pos;
      range[1] = ef->pos;
      ef->pos = pos;
      break;
    }
    default:
      return OPERATOR_CANCELLED;
  }

  if (range[0] != range[1]) {
    BLI_assert(range[0] < range[1]);
    int len_remove = range[1] - range[0];
    int len_tail = ef->len - range[1];
    if (has_select) {
      for (int i = 0; i < 2; i++) {
        int *sel = i ? &ef->selend : &ef->selstart;
        if (*sel <= range[0]) {
          /* pass */
        }
        else if (*sel >= range[1]) {
          *sel -= len_remove;
        }
        else {
          BLI_assert(*sel < range[1]);
          /* pass */
          *sel = range[0];
        }
      }
    }

    memmove(&ef->textbuf[range[0]], &ef->textbuf[range[1]], sizeof(*ef->textbuf) * len_tail);
    memmove(&ef->textbufinfo[range[0]],
            &ef->textbufinfo[range[1]],
            sizeof(*ef->textbufinfo) * len_tail);

    ef->len -= len_remove;
    ef->textbuf[ef->len] = '\0';

    BKE_vfont_select_clamp(obedit);
  }

  text_update_edited(C, obedit, FO_EDIT);

  return OPERATOR_FINISHED;
}

void FONT_OT_delete(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Delete";
  ot->description = "Delete text by cursor position";
  ot->idname = "FONT_OT_delete";

  /* api callbacks */
  ot->exec = delete_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  RNA_def_enum(ot->srna,
               "type",
               delete_type_items,
               DEL_PREV_CHAR,
               "Type",
               "Which part of the text to delete");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Insert Text Operator
 * \{ */

static int insert_text_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_edit_object(C);
  char *inserted_utf8;
  char32_t *inserted_text;
  int a, len;

  if (!RNA_struct_property_is_set(op->ptr, "text")) {
    return OPERATOR_CANCELLED;
  }

  inserted_utf8 = RNA_string_get_alloc(op->ptr, "text", nullptr, 0, nullptr);
  len = BLI_strlen_utf8(inserted_utf8);

  inserted_text = static_cast<char32_t *>(
      MEM_callocN(sizeof(char32_t) * (len + 1), "FONT_insert_text"));
  len = BLI_str_utf8_as_utf32(inserted_text, inserted_utf8, MAXTEXT);

  for (a = 0; a < len; a++) {
    insert_into_textbuf(obedit, inserted_text[a]);
  }

  MEM_freeN(inserted_text);
  MEM_freeN(inserted_utf8);

  kill_selection(obedit, len);
  text_update_edited(C, obedit, FO_EDIT);

  return OPERATOR_FINISHED;
}

static int insert_text_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  static bool accentcode = false;
  const bool alt = event->modifier & KM_ALT;
  const bool shift = event->modifier & KM_SHIFT;
  const bool ctrl = event->modifier & KM_CTRL;
  char32_t insert_char_override = 0;
  char32_t inserted_text[2] = {0};

  if (RNA_struct_property_is_set(op->ptr, "text")) {
    return insert_text_exec(C, op);
  }

  if (RNA_struct_property_is_set(op->ptr, "accent")) {
    if (ef->len != 0 && ef->pos > 0) {
      accentcode = true;
    }
    return OPERATOR_FINISHED;
  }

  if (event->type == EVT_BACKSPACEKEY) {
    if (alt && ef->len != 0 && ef->pos > 0) {
      accentcode = true;
    }
    return OPERATOR_PASS_THROUGH;
  }

  /* Tab typically exit edit-mode, but we allow it to be typed using modifier keys. */
  if (event->type == EVT_TABKEY) {
    if ((alt || ctrl || shift) == 0) {
      return OPERATOR_PASS_THROUGH;
    }
    insert_char_override = '\t';
  }

  if (insert_char_override || event->utf8_buf[0]) {
    if (insert_char_override) {
      /* Handle case like TAB ('\t'). */
      inserted_text[0] = insert_char_override;
      insert_into_textbuf(obedit, insert_char_override);
      text_update_edited(C, obedit, FO_EDIT);
    }
    else {
      BLI_assert(event->utf8_buf[0]);
      if (accentcode) {
        if (ef->pos > 0) {
          inserted_text[0] = findaccent(ef->textbuf[ef->pos - 1],
                                        BLI_str_utf8_as_unicode_or_error(event->utf8_buf));
          ef->textbuf[ef->pos - 1] = inserted_text[0];
        }
        accentcode = false;
      }
      else if (event->utf8_buf[0]) {
        inserted_text[0] = BLI_str_utf8_as_unicode_or_error(event->utf8_buf);
        insert_into_textbuf(obedit, inserted_text[0]);
        accentcode = false;
      }
      else {
        BLI_assert(0);
      }

      kill_selection(obedit, 1);
      text_update_edited(C, obedit, FO_EDIT);
    }
  }
  else {
    return OPERATOR_PASS_THROUGH;
  }

  if (inserted_text[0]) {
    /* store as utf8 in RNA string */
    char inserted_utf8[8] = {0};

    BLI_str_utf32_as_utf8(inserted_utf8, inserted_text, sizeof(inserted_utf8));
    RNA_string_set(op->ptr, "text", inserted_utf8);
  }

  return OPERATOR_FINISHED;
}

void FONT_OT_text_insert(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Insert Text";
  ot->description = "Insert text at cursor position";
  ot->idname = "FONT_OT_text_insert";

  /* api callbacks */
  ot->exec = insert_text_exec;
  ot->invoke = insert_text_invoke;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_UNDO;

  /* properties */
  RNA_def_string(ot->srna, "text", nullptr, 0, "Text", "Text to insert at the cursor position");
  RNA_def_boolean(
      ot->srna,
      "accent",
      false,
      "Accent Mode",
      "Next typed character will strike through previous, for special character input");
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Font Selection Operator
 * \{ */

static int font_cursor_text_index_from_event(bContext *C, Object *obedit, const wmEvent *event)
{
  /* Calculate a plane from the text object's orientation. */
  float plane[4];
  plane_from_point_normal_v3(
      plane, obedit->object_to_world().location(), obedit->object_to_world().ptr()[2]);

  /* Convert Mouse location in region to 3D location in world space. */
  float mal_fl[2] = {float(event->mval[0]), float(event->mval[1])};
  float mouse_loc[3];
  ED_view3d_win_to_3d_on_plane(CTX_wm_region(C), plane, mal_fl, true, mouse_loc);

  /* Convert to object space and scale by font size. */
  mul_m4_v3(obedit->world_to_object().ptr(), mouse_loc);

  float curs_loc[2] = {mouse_loc[0], mouse_loc[1]};
  return BKE_vfont_cursor_to_text_index(obedit, curs_loc);
}

static void font_cursor_set_apply(bContext *C, const wmEvent *event)
{
  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
  Object *ob = DEG_get_evaluated_object(depsgraph, CTX_data_active_object(C));
  Curve *cu = static_cast<Curve *>(ob->data);
  EditFont *ef = cu->editfont;
  BLI_assert(ef->len >= 0);

  const int string_offset = font_cursor_text_index_from_event(C, ob, event);

  if (string_offset > ef->len || string_offset < 0) {
    return;
  }

  cu->curinfo = ef->textbufinfo[ef->pos ? ef->pos - 1 : 0];

  if (ob->totcol > 0) {
    ob->actcol = cu->curinfo.mat_nr + 1;
    if (ob->actcol < 1) {
      ob->actcol = 1;
    }
  }

  if (!ef->selboxes && (ef->selstart == 0)) {
    if (ef->pos == 0) {
      ef->selstart = ef->selend = 1;
    }
    else {
      ef->selstart = ef->selend = string_offset + 1;
    }
  }
  ef->selend = string_offset;
  ef->pos = string_offset;

  DEG_id_tag_update(static_cast<ID *>(ob->data), ID_RECALC_SELECT);
  WM_event_add_notifier(C, NC_GEOM | ND_DATA, ob->data);
}

static int font_selection_set_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
  Object *obedit = CTX_data_active_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  font_cursor_set_apply(C, event);
  ef->selstart = 0;
  ef->selend = 0;
  WM_event_add_modal_handler(C, op);

  return OPERATOR_RUNNING_MODAL;
}

static int font_selection_set_modal(bContext *C, wmOperator * /*op*/, const wmEvent *event)
{
  switch (event->type) {
    case LEFTMOUSE:
      if (event->val == KM_RELEASE) {
        font_cursor_set_apply(C, event);
        return OPERATOR_FINISHED;
      }
      break;
    case MIDDLEMOUSE:
    case RIGHTMOUSE:
      return OPERATOR_FINISHED;
    case MOUSEMOVE:
      font_cursor_set_apply(C, event);
      break;
  }
  return OPERATOR_RUNNING_MODAL;
}

void FONT_OT_selection_set(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Set Selection";
  ot->idname = "FONT_OT_selection_set";
  ot->description = "Set cursor selection";

  /* api callbacks */
  ot->invoke = font_selection_set_invoke;
  ot->modal = font_selection_set_modal;
  ot->poll = ED_operator_editfont;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Select Word Operator
 * \{ */

static int font_select_word_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  BLI_str_cursor_step_bounds_utf32(ef->textbuf, ef->len, ef->pos, &ef->selstart, &ef->selend);
  ef->pos = ef->selend;

  /* XXX: Text object selection start is 1-based, unlike text processing elsewhere in Blender. */
  ef->selstart += 1;

  font_select_update_primary_clipboard(obedit);
  text_update_edited(C, obedit, FO_CURS);

  return OPERATOR_FINISHED;
}

void FONT_OT_select_word(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Select Word";
  ot->idname = "FONT_OT_select_word";
  ot->description = "Select word under cursor";

  /* api callbacks */
  ot->exec = font_select_word_exec;
  ot->poll = ED_operator_editfont;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Text-Box Add Operator
 * \{ */

static int textbox_add_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_active_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  int i;

  if (cu->totbox < 256) {
    for (i = cu->totbox; i > cu->actbox; i--) {
      cu->tb[i] = cu->tb[i - 1];
    }
    cu->tb[cu->actbox] = cu->tb[cu->actbox - 1];
    cu->actbox++;
    cu->totbox++;
  }

  DEG_id_tag_update(static_cast<ID *>(obedit->data), 0);
  WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
  return OPERATOR_FINISHED;
}

void FONT_OT_textbox_add(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Add Text Box";
  ot->description = "Add a new text box";
  ot->idname = "FONT_OT_textbox_add";

  /* api callbacks */
  ot->exec = textbox_add_exec;
  ot->poll = ED_operator_object_active_editable_font;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Text-Box Remove Operator
 * \{ */

static int textbox_remove_exec(bContext *C, wmOperator *op)
{
  Object *obedit = CTX_data_active_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  int i;
  int index = RNA_int_get(op->ptr, "index");

  if (cu->totbox > 1) {
    for (i = index; i < cu->totbox; i++) {
      cu->tb[i] = cu->tb[i + 1];
    }
    cu->totbox--;
    if (cu->actbox >= index) {
      cu->actbox--;
    }
  }

  DEG_id_tag_update(static_cast<ID *>(obedit->data), 0);
  WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);

  return OPERATOR_FINISHED;
}

void FONT_OT_textbox_remove(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Remove Text Box";
  ot->description = "Remove the text box";
  ot->idname = "FONT_OT_textbox_remove";

  /* api callbacks */
  ot->exec = textbox_remove_exec;
  ot->poll = ED_operator_object_active_editable_font;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  RNA_def_int(ot->srna, "index", 0, 0, INT_MAX, "Index", "The current text box", 0, INT_MAX);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Editmode Enter/Exit
 * \{ */

void ED_curve_editfont_make(Object *obedit)
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  int len_char32;

  if (ef == nullptr) {
    ef = cu->editfont = static_cast<EditFont *>(MEM_callocN(sizeof(EditFont), "editfont"));

    ef->textbuf = static_cast<char32_t *>(
        MEM_callocN((MAXTEXT + 4) * sizeof(*ef->textbuf), "texteditbuf"));
    ef->textbufinfo = static_cast<CharInfo *>(
        MEM_callocN((MAXTEXT + 4) * sizeof(CharInfo), "texteditbufinfo"));
  }

  /* Convert the original text to chat32_t. */
  len_char32 = BLI_str_utf8_as_utf32(ef->textbuf, cu->str, MAXTEXT + 4);
  BLI_assert(len_char32 == cu->len_char32);
  ef->len = len_char32;
  BLI_assert(ef->len >= 0);

  /* Old files may not have this initialized (v2.34). Leaving zeroed is OK. */
  if (cu->strinfo) {
    memcpy(ef->textbufinfo, cu->strinfo, ef->len * sizeof(CharInfo));
  }

  ef->pos = cu->pos;
  if (ef->pos > ef->len) {
    ef->pos = ef->len;
  }

  cu->curinfo = ef->textbufinfo[ef->pos ? ef->pos - 1 : 0];

  /* Other vars */
  ef->selstart = cu->selstart;
  ef->selend = cu->selend;

  /* text may have been modified by Python */
  BKE_vfont_select_clamp(obedit);
}

void ED_curve_editfont_load(Object *obedit)
{
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;

  /* Free the old curve string */
  MEM_freeN(cu->str);

  /* Calculate the actual string length in UTF-8 variable characters */
  cu->len_char32 = ef->len;
  cu->len = BLI_str_utf32_as_utf8_len(ef->textbuf);

  /* Alloc memory for UTF-8 variable char length string */
  cu->str = static_cast<char *>(MEM_mallocN(cu->len + sizeof(char32_t), "str"));

  /* Copy the wchar to UTF-8 */
  BLI_str_utf32_as_utf8(cu->str, ef->textbuf, cu->len + 1);

  if (cu->strinfo) {
    MEM_freeN(cu->strinfo);
  }
  cu->strinfo = static_cast<CharInfo *>(
      MEM_callocN((cu->len_char32 + 4) * sizeof(CharInfo), "texteditinfo"));
  memcpy(cu->strinfo, ef->textbufinfo, cu->len_char32 * sizeof(CharInfo));

  /* Other vars */
  cu->pos = ef->pos;
  cu->selstart = ef->selstart;
  cu->selend = ef->selend;
}

void ED_curve_editfont_free(Object *obedit)
{
  BKE_curve_editfont_free((Curve *)obedit->data);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Set Case Operator
 * \{ */

static const EnumPropertyItem case_items[] = {
    {CASE_LOWER, "LOWER", 0, "Lower", ""},
    {CASE_UPPER, "UPPER", 0, "Upper", ""},
    {0, nullptr, 0, nullptr, nullptr},
};

static int set_case(bContext *C, int ccase)
{
  Object *obedit = CTX_data_edit_object(C);
  int selstart, selend;

  if (BKE_vfont_select_get(obedit, &selstart, &selend)) {
    Curve *cu = (Curve *)obedit->data;
    EditFont *ef = cu->editfont;
    char32_t *str = &ef->textbuf[selstart];

    for (int len = (selend - selstart) + 1; len; len--, str++) {
      *str = (ccase == CASE_LOWER) ? BLI_str_utf32_char_to_lower(*str) :
                                     BLI_str_utf32_char_to_upper(*str);
    }

    text_update_edited(C, obedit, FO_EDIT);
  }

  return OPERATOR_FINISHED;
}

static int set_case_exec(bContext *C, wmOperator *op)
{
  return set_case(C, RNA_enum_get(op->ptr, "case"));
}

void FONT_OT_case_set(wmOperatorType *ot)
{
  PropertyRNA *prop;

  /* identifiers */
  ot->name = "Set Case";
  ot->description = "Set font case";
  ot->idname = "FONT_OT_case_set";

  /* api callbacks */
  ot->exec = set_case_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  prop = RNA_def_enum(ot->srna, "case", case_items, CASE_LOWER, "Case", "Lower or upper case");
  RNA_def_property_translation_context(prop, BLT_I18NCONTEXT_ID_TEXT);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Toggle Case Operator
 * \{ */

static int toggle_case_exec(bContext *C, wmOperator * /*op*/)
{
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  EditFont *ef = cu->editfont;
  char32_t *str;
  int ccase = CASE_UPPER;

  str = ef->textbuf;
  while (*str) {
    if (*str >= 'a' && *str <= 'z') {
      ccase = CASE_LOWER;
      break;
    }

    str++;
  }

  return set_case(C, ccase);
}

void FONT_OT_case_toggle(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Toggle Case";
  ot->description = "Toggle font case";
  ot->idname = "FONT_OT_case_toggle";

  /* api callbacks */
  ot->exec = toggle_case_exec;
  ot->poll = ED_operator_editfont;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* **************** Open Font ************** */

static void font_ui_template_init(bContext *C, wmOperator *op)
{
  PropertyPointerRNA *pprop;

  op->customdata = pprop = static_cast<PropertyPointerRNA *>(
      MEM_callocN(sizeof(PropertyPointerRNA), "OpenPropertyPointerRNA"));
  UI_context_active_but_prop_get_templateID(C, &pprop->ptr, &pprop->prop);
}

static void font_open_cancel(bContext * /*C*/, wmOperator *op)
{
  MEM_freeN(op->customdata);
  op->customdata = nullptr;
}

static int font_open_exec(bContext *C, wmOperator *op)
{
  Main *bmain = CTX_data_main(C);
  VFont *font;
  PropertyPointerRNA *pprop;
  char filepath[FILE_MAX];
  RNA_string_get(op->ptr, "filepath", filepath);

  font = BKE_vfont_load(bmain, filepath);

  if (!font) {
    if (op->customdata) {
      MEM_freeN(op->customdata);
    }
    return OPERATOR_CANCELLED;
  }

  if (!op->customdata) {
    font_ui_template_init(C, op);
  }

  /* hook into UI */
  pprop = static_cast<PropertyPointerRNA *>(op->customdata);

  if (pprop->prop) {
    /* when creating new ID blocks, use is already 1, but RNA
     * pointer use also increases user, so this compensates it */
    id_us_min(&font->id);

    PointerRNA idptr = RNA_id_pointer_create(&font->id);
    RNA_property_pointer_set(&pprop->ptr, pprop->prop, idptr, nullptr);
    RNA_property_update(C, &pprop->ptr, pprop->prop);
  }

  MEM_freeN(op->customdata);

  return OPERATOR_FINISHED;
}

static int open_invoke(bContext *C, wmOperator *op, const wmEvent * /*event*/)
{
  VFont *vfont = nullptr;
  char filepath[FILE_MAX];

  PointerRNA idptr;
  PropertyPointerRNA *pprop;

  font_ui_template_init(C, op);

  /* hook into UI */
  pprop = static_cast<PropertyPointerRNA *>(op->customdata);

  if (pprop->prop) {
    idptr = RNA_property_pointer_get((PointerRNA *)pprop, pprop->prop);
    vfont = (VFont *)idptr.owner_id;
  }

  PropertyRNA *prop_filepath = RNA_struct_find_property(op->ptr, "filepath");
  if (RNA_property_is_set(op->ptr, prop_filepath)) {
    return font_open_exec(C, op);
  }

  if (vfont && !BKE_vfont_is_builtin(vfont)) {
    STRNCPY(filepath, vfont->filepath);
    BLI_path_abs(filepath, ID_BLEND_PATH_FROM_GLOBAL(&vfont->id));
  }
  else {
    STRNCPY(filepath, U.fontdir);
    BLI_path_slash_ensure(filepath, sizeof(filepath));
  }
  RNA_property_string_set(op->ptr, prop_filepath, filepath);

  WM_event_add_fileselect(C, op);

  return OPERATOR_RUNNING_MODAL;
}

void FONT_OT_open(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Open Font";
  ot->idname = "FONT_OT_open";
  ot->description = "Load a new font from a file";

  /* api callbacks */
  ot->exec = font_open_exec;
  ot->invoke = open_invoke;
  ot->cancel = font_open_cancel;

  /* flags */
  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

  /* properties */
  WM_operator_properties_filesel(ot,
                                 FILE_TYPE_FOLDER | FILE_TYPE_FTFONT,
                                 FILE_SPECIAL,
                                 FILE_OPENFILE,
                                 WM_FILESEL_FILEPATH | WM_FILESEL_RELPATH,
                                 FILE_IMGDISPLAY,
                                 FILE_SORT_ALPHA);
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Delete Operator
 * \{ */

static int font_unlink_exec(bContext *C, wmOperator *op)
{
  VFont *builtin_font;

  PropertyPointerRNA pprop;

  UI_context_active_but_prop_get_templateID(C, &pprop.ptr, &pprop.prop);

  if (pprop.prop == nullptr) {
    BKE_report(op->reports, RPT_ERROR, "Incorrect context for running font unlink");
    return OPERATOR_CANCELLED;
  }

  builtin_font = BKE_vfont_builtin_get();

  PointerRNA idptr = RNA_id_pointer_create(&builtin_font->id);
  RNA_property_pointer_set(&pprop.ptr, pprop.prop, idptr, nullptr);
  RNA_property_update(C, &pprop.ptr, pprop.prop);

  return OPERATOR_FINISHED;
}

void FONT_OT_unlink(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Unlink";
  ot->idname = "FONT_OT_unlink";
  ot->description = "Unlink active font data-block";

  /* api callbacks */
  ot->exec = font_unlink_exec;
}

bool ED_curve_editfont_select_pick(
    bContext *C,
    const int mval[2],
    /* NOTE: `params->deselect_all` is ignored as only one text-box is active at once. */
    const SelectPick_Params *params)
{
  Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
  Object *obedit = CTX_data_edit_object(C);
  Curve *cu = static_cast<Curve *>(obedit->data);
  /* bias against the active, in pixels, allows cycling */
  const float active_bias_px = 4.0f;
  const float mval_fl[2] = {float(mval[0]), float(mval[1])};
  const int i_actbox = max_ii(0, cu->actbox - 1);
  int i_iter, actbox_select = -1;
  const float dist = ED_view3d_select_dist_px();
  float dist_sq_best = dist * dist;

  ViewContext vc = ED_view3d_viewcontext_init(C, depsgraph);

  ED_view3d_init_mats_rv3d(vc.obedit, vc.rv3d);

  /* currently only select active */
  (void)params;

  for (i_iter = 0; i_iter < cu->totbox; i_iter++) {
    int i = (i_iter + i_actbox) % cu->totbox;
    float dist_sq_min;
    int j, j_prev;

    float obedit_co[4][3];
    float screen_co[4][2];
    rctf rect;
    int project_ok = 0;

    BKE_curve_rect_from_textbox(cu, &cu->tb[i], &rect);

    copy_v3_fl3(obedit_co[0], rect.xmin, rect.ymin, 0.0f);
    copy_v3_fl3(obedit_co[1], rect.xmin, rect.ymax, 0.0f);
    copy_v3_fl3(obedit_co[2], rect.xmax, rect.ymax, 0.0f);
    copy_v3_fl3(obedit_co[3], rect.xmax, rect.ymin, 0.0f);

    for (j = 0; j < 4; j++) {
      if (ED_view3d_project_float_object(
              vc.region, obedit_co[j], screen_co[j], V3D_PROJ_TEST_CLIP_BB) == V3D_PROJ_RET_OK)
      {
        project_ok |= (1 << j);
      }
    }

    dist_sq_min = dist_sq_best;
    for (j = 0, j_prev = 3; j < 4; j_prev = j++) {
      if ((project_ok & (1 << j)) && (project_ok & (1 << j_prev))) {
        const float dist_test_sq = dist_squared_to_line_segment_v2(
            mval_fl, screen_co[j_prev], screen_co[j]);
        if (dist_sq_min > dist_test_sq) {
          dist_sq_min = dist_test_sq;
        }
      }
    }

    /* Bias in pixels to cycle selection. */
    if (i_iter == 0) {
      dist_sq_min += active_bias_px;
    }

    if (dist_sq_min < dist_sq_best) {
      dist_sq_best = dist_sq_min;
      actbox_select = i + 1;
    }
  }

  if (actbox_select != -1) {
    if (cu->actbox != actbox_select) {
      cu->actbox = actbox_select;
      WM_event_add_notifier(C, NC_GEOM | ND_DATA, obedit->data);
      /* TODO: support #ID_RECALC_SELECT. */
      DEG_id_tag_update(static_cast<ID *>(obedit->data), ID_RECALC_SYNC_TO_EVAL);
    }
    return true;
  }
  return false;
}

/** \} */
