/*
 * rofi
 *
 * MIT/X11 License
 * Copyright © 2012 Sean Pringle <sean.pringle@gmail.com>
 * Copyright © 2013-2023 Qball Cow <qball@gmpclient.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
#include "config.h"

#include "helper-theme.h"
#include "helper.h"
#include "keyb.h"
#include "mode.h"
#include "view.h"
#include "widgets/textbox.h"
#include <ctype.h>
#include <glib.h>
#include <math.h>
#include <string.h>
#include <xcb/xcb.h>

#include "theme.h"

static void textbox_draw(widget *, cairo_t *);
static void textbox_free(widget *);
static int textbox_get_width(widget *);
static int _textbox_get_height(widget *);
static void __textbox_update_pango_text(textbox *tb);

/** Default pango context */
static PangoContext *p_context = NULL;
/** The pango font metrics */
static PangoFontMetrics *p_metrics = NULL;

/** Default tbfc */
static TBFontConfig *tbfc_default = NULL;

/** HashMap of previously parsed font descriptions. */
static GHashTable *tbfc_cache = NULL;

static gboolean textbox_blink(gpointer data) {
  textbox *tb = (textbox *)data;
  if (tb->blink < 2) {
    tb->blink = !tb->blink;
    widget_queue_redraw(WIDGET(tb));
    rofi_view_queue_redraw();
  } else {
    tb->blink--;
  }
  return TRUE;
}

static void textbox_resize(widget *wid, short w, short h) {
  textbox *tb = (textbox *)wid;
  textbox_moveresize(tb, tb->widget.x, tb->widget.y, w, h);
}
static int textbox_get_desired_height(widget *wid, const int width) {
  textbox *tb = (textbox *)wid;
  if ((tb->flags & TB_AUTOHEIGHT) == 0) {
    return tb->widget.h;
  }
  if (tb->changed) {
    __textbox_update_pango_text(tb);
  }
  int old_width = pango_layout_get_width(tb->layout);
  pango_layout_set_width(
      tb->layout,
      PANGO_SCALE * (width - widget_padding_get_padding_width(WIDGET(tb))));

  int height =
      textbox_get_estimated_height(tb, pango_layout_get_line_count(tb->layout));
  pango_layout_set_width(tb->layout, old_width);
  return height;
}

static WidgetTriggerActionResult
textbox_editable_trigger_action(widget *wid,
                                MouseBindingMouseDefaultAction action, gint x,
                                gint y, G_GNUC_UNUSED void *user_data) {
  textbox *tb = (textbox *)wid;
  switch (action) {
  case MOUSE_CLICK_DOWN: {
    gint i;
    // subtract padding on left.
    x -= widget_padding_get_left(wid);
    gint max = textbox_get_font_width(tb);
    // Right of text, move to end.
    if (x >= max) {
      textbox_cursor_end(tb);
    } else if (x > 0) {
      // If in range, get index.
      pango_layout_xy_to_index(tb->layout, x * PANGO_SCALE, y * PANGO_SCALE, &i,
                               NULL);
      textbox_cursor(tb, i);
    }
    return WIDGET_TRIGGER_ACTION_RESULT_HANDLED;
  }
  case MOUSE_CLICK_UP:
  case MOUSE_DCLICK_DOWN:
  case MOUSE_DCLICK_UP:
    break;
  }
  return WIDGET_TRIGGER_ACTION_RESULT_IGNORED;
}

static void textbox_initialize_font(textbox *tb) {
  tb->tbfc = tbfc_default;
  const char *font = rofi_theme_get_string(WIDGET(tb), "font", NULL);
  if (font) {
    TBFontConfig *tbfc = g_hash_table_lookup(tbfc_cache, font);
    if (tbfc == NULL) {
      tbfc = g_malloc0(sizeof(TBFontConfig));
      tbfc->pfd = pango_font_description_from_string(font);
      if (helper_validate_font(tbfc->pfd, font)) {
        tbfc->metrics = pango_context_get_metrics(p_context, tbfc->pfd, NULL);

        PangoLayout *layout = pango_layout_new(p_context);
        pango_layout_set_font_description(layout, tbfc->pfd);
        pango_layout_set_text(layout, "aAjb", -1);
        PangoRectangle rect;
        pango_layout_get_pixel_extents(layout, NULL, &rect);
        tbfc->height = rect.y + rect.height;
        g_object_unref(layout);

        // Cast away consts. (*yuck*) because table_insert does not know it is
        // const.
        g_hash_table_insert(tbfc_cache, (char *)font, tbfc);
      } else {
        pango_font_description_free(tbfc->pfd);
        g_free(tbfc);
        tbfc = NULL;
      }
    }
    if (tbfc) {
      // Update for used font.
      pango_layout_set_font_description(tb->layout, tbfc->pfd);
      tb->tbfc = tbfc;
    }
  }
}

static void textbox_tab_stops(textbox *tb) {
  GList *dists = rofi_theme_get_list_distance(WIDGET(tb), "tab-stops");

  if (dists != NULL) {
    PangoTabArray *tabs = pango_tab_array_new(g_list_length(dists), TRUE);

    int i = 0, ppx = 0;
    for (const GList *iter = g_list_first(dists); iter != NULL;
         iter = g_list_next(iter), i++) {
      const RofiDistance *dist = iter->data;

      int px = distance_get_pixel(*dist, ROFI_ORIENTATION_HORIZONTAL);
      if (px <= ppx) {
        continue;
      }
      pango_tab_array_set_tab(tabs, i, PANGO_TAB_LEFT, px);
      ppx = px;
    }
    pango_layout_set_tabs(tb->layout, tabs);

    pango_tab_array_free(tabs);
    g_list_free_full(dists, g_free);
  }
}

textbox *textbox_create(widget *parent, WidgetType type, const char *name,
                        TextboxFlags flags, TextBoxFontType tbft,
                        const char *text, double xalign, double yalign) {
  textbox *tb = g_slice_new0(textbox);

  widget_init(WIDGET(tb), parent, type, name);

  tb->widget.draw = textbox_draw;
  tb->widget.free = textbox_free;
  tb->widget.resize = textbox_resize;
  tb->widget.get_width = textbox_get_width;
  tb->widget.get_height = _textbox_get_height;
  tb->widget.get_desired_height = textbox_get_desired_height;
  tb->widget.get_desired_width = textbox_get_desired_width;
  tb->flags = flags;
  tb->emode = PANGO_ELLIPSIZE_END;

  tb->changed = FALSE;

  tb->layout = pango_layout_new(p_context);
  textbox_font(tb, tbft);

  textbox_initialize_font(tb);
  textbox_tab_stops(tb);

  if ((tb->flags & TB_WRAP) == TB_WRAP) {
    pango_layout_set_wrap(tb->layout, PANGO_WRAP_WORD_CHAR);
  }

  // Allow overriding of markup.
  if (rofi_theme_get_boolean(WIDGET(tb), "markup",
                             (tb->flags & TB_MARKUP) == TB_MARKUP)) {
    tb->flags |= TB_MARKUP;
  } else {
    tb->flags &= (~TB_MARKUP);
  }

  const char *txt = rofi_theme_get_string(WIDGET(tb), "str", text);
  if (txt == NULL || (*txt) == '\0') {
    txt = rofi_theme_get_string(WIDGET(tb), "content", text);
  }
  const char *placeholder =
      rofi_theme_get_string(WIDGET(tb), "placeholder", NULL);
  if (placeholder) {
    if (rofi_theme_get_boolean(WIDGET(tb), "placeholder-markup", FALSE)) {
      tb->placeholder = g_strdup(placeholder);
    } else {
      tb->placeholder = g_markup_escape_text(placeholder, -1);
    }
  }
  textbox_text(tb, txt ? txt : "");
  textbox_cursor_end(tb);

  tb->blink_timeout = 0;
  tb->blink = 1;
  if ((tb->flags & TB_EDITABLE) == TB_EDITABLE) {
    if (rofi_theme_get_boolean(WIDGET(tb), "blink", TRUE)) {
      tb->blink_timeout = g_timeout_add(1200, textbox_blink, tb);
    }
    tb->widget.trigger_action = textbox_editable_trigger_action;
  }

  tb->yalign = rofi_theme_get_double(WIDGET(tb), "vertical-align", yalign);
  tb->yalign = MAX(0, MIN(1.0, tb->yalign));
  tb->xalign = rofi_theme_get_double(WIDGET(tb), "horizontal-align", xalign);
  tb->xalign = MAX(0, MIN(1.0, tb->xalign));

  if (tb->xalign < 0.2) {
    pango_layout_set_alignment(tb->layout, PANGO_ALIGN_LEFT);
  } else if (tb->xalign < 0.8) {
    pango_layout_set_alignment(tb->layout, PANGO_ALIGN_CENTER);
  } else {
    pango_layout_set_alignment(tb->layout, PANGO_ALIGN_RIGHT);
  }
  // auto height/width modes get handled here
  // UPDATE: don't autoheight here, as there is no width set.
  // so no height can be determined and might result into  crash.
  // textbox_moveresize(tb, tb->widget.x, tb->widget.y, tb->widget.w,
  //                   tb->widget.h);

  return tb;
}

/**
 * State names used for theming.
 */
const char *const theme_prop_names[][3] = {
    /** Normal row */
    {"normal.normal", "selected.normal", "alternate.normal"},
    /** Urgent row */
    {"normal.urgent", "selected.urgent", "alternate.urgent"},
    /** Active row */
    {"normal.active", "selected.active", "alternate.active"},
};

void textbox_font(textbox *tb, TextBoxFontType tbft) {
  TextBoxFontType t = tbft & STATE_MASK;
  if (tb == NULL) {
    return;
  }
  // ACTIVE has priority over URGENT if both set.
  if (t == (URGENT | ACTIVE)) {
    t = ACTIVE;
  }
  switch ((tbft & FMOD_MASK)) {
  case HIGHLIGHT:
    widget_set_state(WIDGET(tb), theme_prop_names[t][1]);
    break;
  case ALT:
    widget_set_state(WIDGET(tb), theme_prop_names[t][2]);
    break;
  default:
    widget_set_state(WIDGET(tb), theme_prop_names[t][0]);
    break;
  }
  if (tb->tbft != tbft || tb->widget.state == NULL) {
    widget_queue_redraw(WIDGET(tb));
  }
  tb->tbft = tbft;
}

/**
 * @param tb The textbox object.
 *
 * Update the pango layout's text. It does this depending on the
 * textbox flags.
 */
static void __textbox_update_pango_text(textbox *tb) {
  pango_layout_set_attributes(tb->layout, NULL);
  if (tb->placeholder && (tb->text == NULL || tb->text[0] == 0)) {
    tb->show_placeholder = TRUE;
    pango_layout_set_markup(tb->layout, tb->placeholder, -1);
    return;
  }
  tb->show_placeholder = FALSE;
  if ((tb->flags & TB_PASSWORD) == TB_PASSWORD) {
    size_t l = g_utf8_strlen(tb->text, -1);
    char string[l + 1];
    memset(string, '*', l);
    string[l] = '\0';
    pango_layout_set_text(tb->layout, string, l);
  } else if (tb->flags & TB_MARKUP || tb->tbft & MARKUP) {
    pango_layout_set_markup(tb->layout, tb->text, -1);
  } else {
    pango_layout_set_text(tb->layout, tb->text, -1);
  }
  if (tb->text) {
    RofiHighlightColorStyle th = {0, {0.0, 0.0, 0.0, 0.0}};
    th = rofi_theme_get_highlight(WIDGET(tb), "text-transform", th);
    if (th.style != 0) {
      PangoAttrList *list = pango_attr_list_new();
      helper_token_match_set_pango_attr_on_style(list, 0, G_MAXUINT, th);
      pango_layout_set_attributes(tb->layout, list);
    }
  }
}
const char *textbox_get_visible_text(const textbox *tb) {
  if (tb == NULL) {
    return NULL;
  }
  return pango_layout_get_text(tb->layout);
}
PangoAttrList *textbox_get_pango_attributes(textbox *tb) {
  if (tb == NULL) {
    return NULL;
  }
  return pango_layout_get_attributes(tb->layout);
}
void textbox_set_pango_attributes(textbox *tb, PangoAttrList *list) {
  if (tb == NULL) {
    return;
  }
  pango_layout_set_attributes(tb->layout, list);
}

char *textbox_get_text(const textbox *tb) {
  if (tb->text == NULL) {
    return g_strdup("");
  }
  return g_strdup(tb->text);
}
int textbox_get_cursor(const textbox *tb) {
  if (tb) {
    return tb->cursor;
  }
  return 0;
}
// set the default text to display
void textbox_text(textbox *tb, const char *text) {
  if (tb == NULL) {
    return;
  }
  g_free(tb->text);
  const gchar *last_pointer = NULL;

  if (text == NULL) {
    tb->text = g_strdup("Invalid string.");
  } else {
    if (g_utf8_validate(text, -1, &last_pointer)) {
      tb->text = g_strdup(text);
    } else {
      if (last_pointer != NULL) {
        // Copy string up to invalid character.
        tb->text = g_strndup(text, (last_pointer - text));
      } else {
        tb->text = g_strdup("Invalid UTF-8 string.");
      }
    }
  }
  __textbox_update_pango_text(tb);
  if (tb->flags & TB_AUTOWIDTH) {
    textbox_moveresize(tb, tb->widget.x, tb->widget.y, tb->widget.w,
                       tb->widget.h);
    if (WIDGET(tb)->parent) {
      widget_update(WIDGET(tb)->parent);
    }
  }

  tb->cursor = MAX(0, MIN((int)g_utf8_strlen(tb->text, -1), tb->cursor));
  widget_queue_redraw(WIDGET(tb));
}

// within the parent handled auto width/height modes
void textbox_moveresize(textbox *tb, int x, int y, int w, int h) {
  if (tb->flags & TB_AUTOWIDTH) {
    pango_layout_set_width(tb->layout, -1);
    w = textbox_get_font_width(tb) +
        widget_padding_get_padding_width(WIDGET(tb));
  } else {
    // set ellipsize
    if ((tb->flags & TB_EDITABLE) == TB_EDITABLE) {
      pango_layout_set_ellipsize(tb->layout, PANGO_ELLIPSIZE_MIDDLE);
    } else if ((tb->flags & TB_WRAP) != TB_WRAP) {
      pango_layout_set_ellipsize(tb->layout, tb->emode);
    } else {
      pango_layout_set_ellipsize(tb->layout, PANGO_ELLIPSIZE_NONE);
    }
  }

  if (tb->flags & TB_AUTOHEIGHT) {
    // Width determines height!
    int padding = widget_padding_get_padding_width(WIDGET(tb));
    int tw = MAX(1 + padding, w);
    pango_layout_set_width(tb->layout, PANGO_SCALE * (tw - padding));
    int hd = textbox_get_height(tb);
    h = MAX(hd, h);
  }

  if (x != tb->widget.x || y != tb->widget.y || w != tb->widget.w ||
      h != tb->widget.h) {
    tb->widget.x = x;
    tb->widget.y = y;
    tb->widget.h = MAX(1, h);
    tb->widget.w = MAX(1, w);
  }

  // We always want to update this
  pango_layout_set_width(
      tb->layout, PANGO_SCALE * (tb->widget.w -
                                 widget_padding_get_padding_width(WIDGET(tb))));
  widget_queue_redraw(WIDGET(tb));
}

// will also unmap the window if still displayed
static void textbox_free(widget *wid) {
  if (wid == NULL) {
    return;
  }
  textbox *tb = (textbox *)wid;
  if (tb->blink_timeout > 0) {
    g_source_remove(tb->blink_timeout);
    tb->blink_timeout = 0;
  }
  g_free(tb->text);

  g_free(tb->placeholder);
  if (tb->layout != NULL) {
    g_object_unref(tb->layout);
  }

  g_slice_free(textbox, tb);
}

static void textbox_draw(widget *wid, cairo_t *draw) {
  if (wid == NULL) {
    return;
  }
  textbox *tb = (textbox *)wid;
  int dot_offset = 0;

  if (tb->changed) {
    __textbox_update_pango_text(tb);
  }

  // Skip the side MARGIN on the X axis.
  int x;
  int top = widget_padding_get_top(WIDGET(tb));
  int y = (pango_font_metrics_get_ascent(tb->tbfc->metrics) -
           pango_layout_get_baseline(tb->layout)) /
          PANGO_SCALE;
  int line_width = 0, line_height = 0;
  // Get actual width.
  pango_layout_get_pixel_size(tb->layout, &line_width, &line_height);

  if (tb->yalign > 0.001) {
    int bottom = widget_padding_get_bottom(WIDGET(tb));
    top = (tb->widget.h - bottom - line_height - top) * tb->yalign + top;
  }
  y += top;

  // Set ARGB
  // NOTE: cairo operator must be OVER at this moment,
  // to not break subpixel text rendering.

  cairo_set_source_rgb(draw, 0.0, 0.0, 0.0);
  // use text color as fallback for themes that don't specify the cursor color
  rofi_theme_get_color(WIDGET(tb), "text-color", draw);

  { int rem =
          MAX(0, tb->widget.w - widget_padding_get_padding_width(WIDGET(tb)) -
                     line_width - dot_offset);
    switch (pango_layout_get_alignment(tb->layout)) {
    case PANGO_ALIGN_CENTER:
      x = rem * (tb->xalign - 0.5);
      break;
    case PANGO_ALIGN_RIGHT:
      x = rem * (tb->xalign - 1.0);
      break;
    default:
      x = rem * tb->xalign + dot_offset;
      break;
    }
    x += widget_padding_get_left(WIDGET(tb));
  }

  // draw the cursor
  if (tb->flags & TB_EDITABLE) {
    // We want to place the cursor based on the text shown.
    const char *text = pango_layout_get_text(tb->layout);
    // Clamp the position, should not be needed, but we are paranoid.
    int cursor_offset = MIN(tb->cursor, g_utf8_strlen(text, -1));
    PangoRectangle pos;
    // convert to byte location.
    char *offset = g_utf8_offset_to_pointer(text, cursor_offset);
    pango_layout_get_cursor_pos(tb->layout, offset - text, &pos, NULL);
    int cursor_x = pos.x / PANGO_SCALE;
    int cursor_y = pos.y / PANGO_SCALE;
    int cursor_height = pos.height / PANGO_SCALE;
    RofiDistance cursor_width =
        rofi_theme_get_distance(WIDGET(tb), "cursor-width", 2);
    int cursor_pixel_width =
        distance_get_pixel(cursor_width, ROFI_ORIENTATION_HORIZONTAL);
    if ((x + cursor_x) != tb->cursor_x_pos) {
      tb->cursor_x_pos = x + cursor_x;
    }
    if (tb->blink) {
      // This save/restore state is necessary to render the text in the
      // correct color when `cursor-color` is set
      cairo_save(draw);
      // use text color as fallback for themes that don't specify the cursor
      // color
      rofi_theme_get_color(WIDGET(tb), "cursor-color", draw);
      cairo_rectangle(draw, x + cursor_x, y + cursor_y, cursor_pixel_width,
                      cursor_height);
      if (rofi_theme_get_boolean(WIDGET(tb), "cursor-outline", FALSE)) {
        cairo_fill_preserve(draw);
        rofi_theme_get_color(WIDGET(tb), "cursor-outline-color", draw);
        double width =
            rofi_theme_get_double(WIDGET(tb), "cursor-outline-width", 0.5);
        cairo_set_line_width(draw, width);
        cairo_stroke(draw);
      } else {
        cairo_fill(draw);
      }
      cairo_restore(draw);
    }
  }

  // draw the text
  cairo_save(draw);
  double x1, y1, x2, y2;
  cairo_clip_extents(draw, &x1, &y1, &x2, &y2);
  cairo_reset_clip(draw);
  cairo_rectangle(draw, x1, y1, x2 - x1, y2 - y1);
  cairo_clip(draw);

  gboolean show_outline;
  if (tb->show_placeholder) {
    rofi_theme_get_color(WIDGET(tb), "placeholder-color", draw);
    show_outline = FALSE;
  } else {
    show_outline = rofi_theme_get_boolean(WIDGET(tb), "text-outline", FALSE);
  }
  cairo_move_to(draw, x, top);
  pango_cairo_show_layout(draw, tb->layout);

  if (show_outline) {
    rofi_theme_get_color(WIDGET(tb), "text-outline-color", draw);
    double width = rofi_theme_get_double(WIDGET(tb), "text-outline-width", 0.5);
    cairo_move_to(draw, x, top);
    pango_cairo_layout_path(draw, tb->layout);
    cairo_set_line_width(draw, width);
    cairo_stroke(draw);
  }

  cairo_restore(draw);
}

// cursor handling for edit mode
void textbox_cursor(textbox *tb, int pos) {
  if (tb == NULL) {
    return;
  }
  int length = (tb->text == NULL) ? 0 : g_utf8_strlen(tb->text, -1);
  tb->cursor = MAX(0, MIN(length, pos));
  // Stop blink!
  tb->blink = 3;
  widget_queue_redraw(WIDGET(tb));
}

/**
 * @param tb Handle to the textbox
 *
 * Move cursor one position forward.
 *
 * @returns if cursor was moved.
 */
static int textbox_cursor_inc(textbox *tb) {
  int old = tb->cursor;
  textbox_cursor(tb, tb->cursor + 1);
  return old != tb->cursor;
}

/**
 * @param tb Handle to the textbox
 *
 * Move cursor one position backward.
 *
 * @returns if cursor was moved.
 */
static int textbox_cursor_dec(textbox *tb) {
  int old = tb->cursor;
  textbox_cursor(tb, tb->cursor - 1);
  return old != tb->cursor;
}

// Move word right
static void textbox_cursor_inc_word(textbox *tb) {
  if (tb->text == NULL) {
    return;
  }
  // Find word boundaries, with pango_Break?
  gchar *c = g_utf8_offset_to_pointer(tb->text, tb->cursor);
  while ((c = g_utf8_next_char(c))) {
    gunichar uc = g_utf8_get_char(c);
    GUnicodeBreakType bt = g_unichar_break_type(uc);
    if ((bt == G_UNICODE_BREAK_ALPHABETIC ||
         bt == G_UNICODE_BREAK_HEBREW_LETTER || bt == G_UNICODE_BREAK_NUMERIC ||
         bt == G_UNICODE_BREAK_QUOTATION)) {
      break;
    }
  }
  if (c == NULL || *c == '\0') {
    return;
  }
  while ((c = g_utf8_next_char(c))) {
    gunichar uc = g_utf8_get_char(c);
    GUnicodeBreakType bt = g_unichar_break_type(uc);
    if (!(bt == G_UNICODE_BREAK_ALPHABETIC ||
          bt == G_UNICODE_BREAK_HEBREW_LETTER ||
          bt == G_UNICODE_BREAK_NUMERIC || bt == G_UNICODE_BREAK_QUOTATION)) {
      break;
    }
  }
  int index = g_utf8_pointer_to_offset(tb->text, c);
  textbox_cursor(tb, index);
}
// move word left
static void textbox_cursor_dec_word(textbox *tb) {
  // Find word boundaries, with pango_Break?
  gchar *n;
  gchar *c = g_utf8_offset_to_pointer(tb->text, tb->cursor);
  while ((c = g_utf8_prev_char(c)) && c != tb->text) {
    gunichar uc = g_utf8_get_char(c);
    GUnicodeBreakType bt = g_unichar_break_type(uc);
    if ((bt == G_UNICODE_BREAK_ALPHABETIC ||
         bt == G_UNICODE_BREAK_HEBREW_LETTER || bt == G_UNICODE_BREAK_NUMERIC ||
         bt == G_UNICODE_BREAK_QUOTATION)) {
      break;
    }
  }
  if (c != tb->text) {
    while ((n = g_utf8_prev_char(c))) {
      gunichar uc = g_utf8_get_char(n);
      GUnicodeBreakType bt = g_unichar_break_type(uc);
      if (!(bt == G_UNICODE_BREAK_ALPHABETIC ||
            bt == G_UNICODE_BREAK_HEBREW_LETTER ||
            bt == G_UNICODE_BREAK_NUMERIC || bt == G_UNICODE_BREAK_QUOTATION)) {
        break;
      }
      c = n;
      if (n == tb->text) {
        break;
      }
    }
  }
  int index = g_utf8_pointer_to_offset(tb->text, c);
  textbox_cursor(tb, index);
}

// end of line
void textbox_cursor_end(textbox *tb) {
  if (tb->text == NULL) {
    tb->cursor = 0;
    widget_queue_redraw(WIDGET(tb));
    return;
  }
  tb->cursor = (int)g_utf8_strlen(tb->text, -1);
  widget_queue_redraw(WIDGET(tb));
  // Stop blink!
  tb->blink = 2;
}

// insert text
void textbox_insert(textbox *tb, const int char_pos, const char *str,
                    const int slen) {
  if (tb == NULL) {
    return;
  }
  char *c = g_utf8_offset_to_pointer(tb->text, char_pos);
  int pos = c - tb->text;
  int len = (int)strlen(tb->text);
  pos = MAX(0, MIN(len, pos));
  // expand buffer
  tb->text = g_realloc(tb->text, len + slen + 1);
  // move everything after cursor upward
  char *at = tb->text + pos;
  memmove(at + slen, at, len - pos + 1);
  // insert new str
  memmove(at, str, slen);

  // Set modified, lay out need te be redrawn
  // Stop blink!
  tb->blink = 2;
  tb->changed = TRUE;
}

// remove text
void textbox_delete(textbox *tb, int pos, int dlen) {
  if (tb == NULL) {
    return;
  }
  int len = g_utf8_strlen(tb->text, -1);
  if (len == pos) {
    return;
  }
  pos = MAX(0, MIN(len, pos));
  if ((pos + dlen) > len) {
    dlen = len - dlen;
  }
  // move everything after pos+dlen down
  char *start = g_utf8_offset_to_pointer(tb->text, pos);
  char *end = g_utf8_offset_to_pointer(tb->text, pos + dlen);
  // Move remainder + closing \0
  memmove(start, end, (tb->text + strlen(tb->text)) - end + 1);
  if (tb->cursor >= pos && tb->cursor < (pos + dlen)) {
    tb->cursor = pos;
  } else if (tb->cursor >= (pos + dlen)) {
    tb->cursor -= dlen;
  }
  // Set modified, lay out need te be redrawn
  // Stop blink!
  tb->blink = 2;
  tb->changed = TRUE;
}

/**
 * @param tb Handle to the textbox
 *
 * Delete character after cursor.
 */
static void textbox_cursor_del(textbox *tb) {
  if (tb == NULL || tb->text == NULL) {
    return;
  }
  textbox_delete(tb, tb->cursor, 1);
}

/**
 * @param tb Handle to the textbox
 *
 * Delete character before cursor.
 */
static void textbox_cursor_bkspc(textbox *tb) {
  if (tb && tb->cursor > 0) {
    textbox_cursor_dec(tb);
    textbox_cursor_del(tb);
  }
}
static void textbox_cursor_bkspc_word(textbox *tb) {
  if (tb && tb->cursor > 0) {
    int cursor = tb->cursor;
    textbox_cursor_dec_word(tb);
    if (cursor > tb->cursor) {
      textbox_delete(tb, tb->cursor, cursor - tb->cursor);
    }
  }
}
static void textbox_cursor_del_eol(textbox *tb) {
  if (tb && tb->cursor >= 0) {
    int length = g_utf8_strlen(tb->text, -1) - tb->cursor;
    if (length >= 0) {
      textbox_delete(tb, tb->cursor, length);
    }
  }
}
static void textbox_cursor_del_sol(textbox *tb) {
  if (tb && tb->cursor >= 0) {
    int length = tb->cursor;
    textbox_delete(tb, 0, length);
  }
}
static void textbox_cursor_del_word(textbox *tb) {
  if (tb && tb->cursor >= 0) {
    int cursor = tb->cursor;
    textbox_cursor_inc_word(tb);
    if (cursor < tb->cursor) {
      textbox_delete(tb, cursor, tb->cursor - cursor);
    }
  }
}

// handle a keypress in edit mode
// 2 = nav
// 0 = unhandled
// 1 = handled
// -1 = handled and return pressed (finished)
int textbox_keybinding(textbox *tb, KeyBindingAction action) {
  if (tb == NULL) {
    return 0;
  }
  if (!(tb->flags & TB_EDITABLE)) {
    return 0;
  }

  switch (action) {
  // Left or Ctrl-b
  case MOVE_CHAR_BACK:
    return (textbox_cursor_dec(tb) == TRUE) ? 2 : 0;
  // Right or Ctrl-F
  case MOVE_CHAR_FORWARD:
    return (textbox_cursor_inc(tb) == TRUE) ? 2 : 0;
  // Ctrl-U: Kill from the beginning to the end of the line.
  case CLEAR_LINE:
    textbox_text(tb, "");
    return 1;
  // Ctrl-A
  case MOVE_FRONT:
    textbox_cursor(tb, 0);
    return 2;
  // Ctrl-E
  case MOVE_END:
    textbox_cursor_end(tb);
    return 2;
  // Ctrl-Alt-h
  case REMOVE_WORD_BACK:
    textbox_cursor_bkspc_word(tb);
    return 1;
  // Ctrl-Alt-d
  case REMOVE_WORD_FORWARD:
    textbox_cursor_del_word(tb);
    return 1;
  case REMOVE_TO_EOL:
    textbox_cursor_del_eol(tb);
    return 1;
  case REMOVE_TO_SOL:
    textbox_cursor_del_sol(tb);
    return 1;
  // Delete or Ctrl-D
  case REMOVE_CHAR_FORWARD:
    textbox_cursor_del(tb);
    return 1;
  // Alt-B, Ctrl-Left
  case MOVE_WORD_BACK:
    textbox_cursor_dec_word(tb);
    return 2;
  // Alt-F, Ctrl-Right
  case MOVE_WORD_FORWARD:
    textbox_cursor_inc_word(tb);
    return 2;
  // BackSpace, Shift-BackSpace, Ctrl-h
  case REMOVE_CHAR_BACK:
    textbox_cursor_bkspc(tb);
    return 1;
  default:
    g_return_val_if_reached(0);
  }
}

gboolean textbox_append_text(textbox *tb, const char *pad, const int pad_len) {
  if (tb == NULL) {
    return FALSE;
  }
  if (!(tb->flags & TB_EDITABLE)) {
    return FALSE;
  }

  // Filter When alt/ctrl is pressed do not accept the character.

  gboolean used_something = FALSE;
  const gchar *w, *n, *e;
  for (w = pad, n = g_utf8_next_char(w), e = w + pad_len; w < e;
       w = n, n = g_utf8_next_char(n)) {
    gunichar c = g_utf8_get_char(w);
    if (g_unichar_isspace(c)) {
      /** Replace tabs, newlines and others with a normal space. */
      textbox_insert(tb, tb->cursor, " ", 1);
      textbox_cursor(tb, tb->cursor + 1);
      used_something = TRUE;
    } else if (g_unichar_iscntrl(c)) {
      /* skip control characters. */
      g_info("Got an invalid character: %08X", c);
    } else {
      /** Insert the text */
      textbox_insert(tb, tb->cursor, w, n - w);
      textbox_cursor(tb, tb->cursor + 1);
      used_something = TRUE;
    }
  }
  return used_something;
}

static void tbfc_entry_free(TBFontConfig *tbfc) {
  pango_font_metrics_unref(tbfc->metrics);
  if (tbfc->pfd) {
    pango_font_description_free(tbfc->pfd);
  }
  g_free(tbfc);
}
void textbox_setup(void) {
  tbfc_cache = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
                                     (GDestroyNotify)tbfc_entry_free);
}

/** Name of the default font (if none is given) */
const char *default_font_name = "default";
void textbox_set_pango_context(const char *font, PangoContext *p) {
  g_assert(p_metrics == NULL);
  p_context = g_object_ref(p);
  p_metrics = pango_context_get_metrics(p_context, NULL, NULL);
  TBFontConfig *tbfc = g_malloc0(sizeof(TBFontConfig));
  tbfc->metrics = p_metrics;

  PangoLayout *layout = pango_layout_new(p_context);
  pango_layout_set_text(layout, "aAjb", -1);
  PangoRectangle rect;
  pango_layout_get_pixel_extents(layout, NULL, &rect);
  tbfc->height = rect.y + rect.height;
  g_object_unref(layout);
  tbfc_default = tbfc;

  g_hash_table_insert(tbfc_cache, (gpointer *)(font ? font : default_font_name),
                      tbfc);
}

void textbox_cleanup(void) {
  g_hash_table_destroy(tbfc_cache);
  if (p_context) {
    g_object_unref(p_context);
    p_context = NULL;
  }
}

int textbox_get_width(widget *wid) {
  textbox *tb = (textbox *)wid;
  if (tb->flags & TB_AUTOWIDTH) {
    return textbox_get_font_width(tb) + widget_padding_get_padding_width(wid);
  }
  return tb->widget.w;
}

int _textbox_get_height(widget *wid) {
  textbox *tb = (textbox *)wid;
  if (tb->flags & TB_AUTOHEIGHT) {
    return textbox_get_estimated_height(
        tb, pango_layout_get_line_count(tb->layout));
  }
  return tb->widget.h;
}
int textbox_get_height(const textbox *tb) {
  return textbox_get_font_height(tb) +
         widget_padding_get_padding_height(WIDGET(tb));
}

int textbox_get_font_height(const textbox *tb) {
  PangoRectangle rect;
  pango_layout_get_pixel_extents(tb->layout, NULL, &rect);
  return rect.height + rect.y;
}

int textbox_get_font_width(const textbox *tb) {
  PangoRectangle rect;
  pango_layout_get_pixel_extents(tb->layout, NULL, &rect);
  return rect.width + rect.x;
}

/** Caching for the estimated character height. (em) */
double textbox_get_estimated_char_height(void) { return tbfc_default->height; }

/** Caching for the expected character width. */
static double char_width = -1;
double textbox_get_estimated_char_width(void) {
  if (char_width < 0) {
    int width = pango_font_metrics_get_approximate_char_width(p_metrics);
    char_width = (width) / (double)PANGO_SCALE;
  }
  return char_width;
}

/** Cache storing the estimated width of a digit (ch). */
static double ch_width = -1;
double textbox_get_estimated_ch(void) {
  if (ch_width < 0) {
    int width = pango_font_metrics_get_approximate_digit_width(p_metrics);
    ch_width = (width) / (double)PANGO_SCALE;
  }
  return ch_width;
}

int textbox_get_estimated_height(const textbox *tb, int eh) {
  int height = tb->tbfc->height;
  return (eh * height) + widget_padding_get_padding_height(WIDGET(tb));
}
int textbox_get_desired_width(widget *wid, G_GNUC_UNUSED const int height) {
  if (wid == NULL) {
    return 0;
  }
  textbox *tb = (textbox *)wid;
  if (wid->expand && tb->flags & TB_AUTOWIDTH) {
    return textbox_get_font_width(tb) + widget_padding_get_padding_width(wid);
  }
  RofiDistance w = rofi_theme_get_distance(WIDGET(tb), "width", 0);
  int wi = distance_get_pixel(w, ROFI_ORIENTATION_HORIZONTAL);
  if (wi > 0) {
    return wi;
  }
  int padding = widget_padding_get_left(WIDGET(tb));
  padding += widget_padding_get_right(WIDGET(tb));
  int old_width = pango_layout_get_width(tb->layout);
  pango_layout_set_width(tb->layout, -1);
  int width = textbox_get_font_width(tb);
  // Restore.
  pango_layout_set_width(tb->layout, old_width);
  return width + padding;
}

void textbox_set_ellipsize(textbox *tb, PangoEllipsizeMode mode) {
  if (tb) {
    tb->emode = mode;
    if ((tb->flags & TB_WRAP) != TB_WRAP) {
      // Store the mode.
      pango_layout_set_ellipsize(tb->layout, tb->emode);
      widget_queue_redraw(WIDGET(tb));
    }
  }
}
int textbox_get_cursor_x_pos(const textbox *tb) {
  if (tb == NULL) {
    return 0;
  }
  return tb->cursor_x_pos;
}
