/* Pango
 * testmisc.c: Test program for miscellaneous things
 *
 * Copyright (C) 2020 Matthias Clasen
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"
#include <glib.h>
#include <pango/pangocairo.h>

#ifdef HAVE_CAIRO_FREETYPE
#include <pango/pango-ot.h>
#endif

/* test that we don't crash in shape_tab when the layout
 * is such that we don't have effective attributes
 */
static void
test_shape_tab_crash (void)
{
  PangoContext *context;
  PangoLayout *layout;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one\ttwo", -1);
  pango_layout_is_ellipsized (layout);

  g_object_unref (layout);
  g_object_unref (context);
}

/* Test that itemizing a string with 0 characters works
 */
static void
test_itemize_empty_crash (void)
{
  PangoContext *context;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  pango_itemize_with_base_dir (context, PANGO_DIRECTION_LTR, "", 0, 1, NULL, NULL);

  g_object_unref (context);
}

static void
test_itemize_utf8 (void)
{
  PangoContext *context;
  GList *result = NULL;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  result = pango_itemize_with_base_dir (context, PANGO_DIRECTION_LTR, "\xc3\xa1\na", 3, 1, NULL, NULL);
  g_assert (result != NULL);

  g_list_free_full (result, (GDestroyNotify)pango_item_free);
  g_object_unref (context);
}

/* Test that pango_layout_set_text (layout, "short", 200)
 * does not lead to a crash. (pidgin does this)
 */
static void
test_short_string_crash (void)
{
  PangoContext *context;
  PangoLayout *layout;
  int width, height;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "short text", 200);
  pango_layout_get_pixel_size (layout, &width, &height);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_language_emoji_crash (void)
{
  PangoLanguage *lang;
  const PangoScript *scripts;
  int num;

  lang = pango_language_from_string ("und-zsye");
  scripts = pango_language_get_scripts (lang, &num);

  g_assert (num >= 0);
  g_assert (scripts == NULL || num > 0);
}

static void
test_line_height (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoLayoutLine *line;
  int height = 0;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one\ttwo", -1);
  line = pango_layout_get_line_readonly (layout, 0);
  pango_layout_line_get_height (line, &height);

  g_assert_cmpint (height, >, 0);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_line_height2 (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoLayoutLine *line;
  int height1 = 0;
  int height2 = 0;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one", -1);

  line = pango_layout_get_line_readonly (layout, 0);
  pango_layout_line_get_height (line, &height1);

  pango_layout_set_text (layout, "", -1);

  line = pango_layout_get_line_readonly (layout, 0);
  pango_layout_line_get_height (line, &height2);

  g_assert_cmpint (height1, ==, height2);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_line_height3 (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoLayoutLine *line;
  PangoAttrList *attrs;
  int height1 = 0;
  int height2 = 0;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one", -1);
  attrs = pango_attr_list_new ();
  pango_attr_list_insert (attrs, pango_attr_line_height_new (2.0));
  pango_layout_set_attributes (layout, attrs);
  pango_attr_list_unref (attrs);

  line = pango_layout_get_line_readonly (layout, 0);
  pango_layout_line_get_height (line, &height1);

  pango_layout_set_text (layout, "", -1);

  line = pango_layout_get_line_readonly (layout, 0);
  pango_layout_line_get_height (line, &height2);

  g_assert_cmpint (height1, ==, height2);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_run_height (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoLayoutIter *iter;
  PangoRectangle logical1, logical2;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one", -1);

  iter = pango_layout_get_iter (layout);
  pango_layout_iter_get_run_extents (iter, NULL, &logical1);
  pango_layout_iter_free (iter);

  pango_layout_set_text (layout, "", -1);

  iter = pango_layout_get_iter (layout);
  pango_layout_iter_get_run_extents (iter, NULL, &logical2);
  pango_layout_iter_free (iter);

  g_assert_cmpint (logical1.height, ==, logical2.height);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_cursor_height (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoRectangle strong;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one\ttwo", -1);
  pango_layout_get_cursor_pos (layout, 0, &strong, NULL);

  g_assert_cmpint (strong.height, >, 0);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_cursor_height2 (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoRectangle strong1, strong2;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());
  layout = pango_layout_new (context);
  pango_layout_set_text (layout, "one", -1);

  pango_layout_get_cursor_pos (layout, 0, &strong1, NULL);

  pango_layout_set_text (layout, "", -1);

  pango_layout_get_cursor_pos (layout, 0, &strong2, NULL);

  g_assert_cmpint (strong1.height, ==, strong2.height);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_attr_list_update (void)
{
  PangoAttribute *weight_attr;
  PangoAttribute *fg_attr;
  PangoAttrList *list;

  weight_attr = pango_attr_weight_new (700);
  weight_attr->start_index = 4;
  weight_attr->end_index = 6;

  fg_attr = pango_attr_foreground_new (0, 0, 65535);
  fg_attr->start_index = PANGO_ATTR_INDEX_FROM_TEXT_BEGINNING;
  fg_attr->end_index = PANGO_ATTR_INDEX_TO_TEXT_END;

  list = pango_attr_list_new();
  pango_attr_list_insert (list, weight_attr);
  pango_attr_list_insert (list, fg_attr);

  g_assert_cmpuint (weight_attr->start_index, ==, 4);
  g_assert_cmpuint (weight_attr->end_index, ==, 6);
  g_assert_cmpuint (fg_attr->start_index, ==, PANGO_ATTR_INDEX_FROM_TEXT_BEGINNING);
  g_assert_cmpuint (fg_attr->end_index, ==, PANGO_ATTR_INDEX_TO_TEXT_END);

  // Delete 1 byte at position 2
  pango_attr_list_update (list, 2, 1, 0);

  g_assert_cmpuint (weight_attr->start_index, ==, 3);
  g_assert_cmpuint (weight_attr->end_index, ==, 5);
  g_assert_cmpuint (fg_attr->start_index, ==, PANGO_ATTR_INDEX_FROM_TEXT_BEGINNING);
  g_assert_cmpuint (fg_attr->end_index, ==, PANGO_ATTR_INDEX_TO_TEXT_END);

  pango_attr_list_unref (list);
}

static void
test_version_info (void)
{
  char *str;

  g_assert_null (pango_version_check (1, 0, 0));
  g_assert_null (pango_version_check (PANGO_VERSION_MAJOR, PANGO_VERSION_MINOR, PANGO_VERSION_MICRO));
  g_assert_nonnull (pango_version_check (2, 0, 0));

  str = g_strdup_printf ("%d.%d.%d", PANGO_VERSION_MAJOR, PANGO_VERSION_MINOR, PANGO_VERSION_MICRO);
  g_assert_cmpstr (str, ==, pango_version_string ());
  g_free (str);
}

static void
test_is_zero_width (void)
{
  g_assert_true (pango_is_zero_width (0x00ad));
  g_assert_true (pango_is_zero_width (0x034f));
  g_assert_false (pango_is_zero_width ('a'));
  g_assert_false (pango_is_zero_width ('c'));

  g_assert_true (pango_is_zero_width (0x2066));
  g_assert_true (pango_is_zero_width (0x2067));
  g_assert_true (pango_is_zero_width (0x2068));
  g_assert_true (pango_is_zero_width (0x2069));

  g_assert_true (pango_is_zero_width (0x202a));
  g_assert_true (pango_is_zero_width (0x202b));
  g_assert_true (pango_is_zero_width (0x202c));
  g_assert_true (pango_is_zero_width (0x202d));
  g_assert_true (pango_is_zero_width (0x202e));
}

static void
test_gravity_to_rotation (void)
{
  g_assert_true (pango_gravity_to_rotation (PANGO_GRAVITY_SOUTH) == 0);
  g_assert_true (pango_gravity_to_rotation (PANGO_GRAVITY_NORTH) == G_PI);
  g_assert_true (pango_gravity_to_rotation (PANGO_GRAVITY_EAST) == -G_PI_2);
  g_assert_true (pango_gravity_to_rotation (PANGO_GRAVITY_WEST) == G_PI_2);
}

static void
test_gravity_from_matrix (void)
{
  PangoMatrix m = PANGO_MATRIX_INIT;

  g_assert_true (pango_gravity_get_for_matrix (&m) == PANGO_GRAVITY_SOUTH);

  pango_matrix_rotate (&m, 90);
  g_assert_true (pango_gravity_get_for_matrix (&m) == PANGO_GRAVITY_WEST);

  pango_matrix_rotate (&m, 90);
  g_assert_true (pango_gravity_get_for_matrix (&m) == PANGO_GRAVITY_NORTH);

  pango_matrix_rotate (&m, 90);
  g_assert_true (pango_gravity_get_for_matrix (&m) == PANGO_GRAVITY_EAST);
}

static void
test_gravity_for_script (void)
{
  struct {
    PangoScript script;
    PangoGravity gravity;
    PangoGravity gravity_natural;
    PangoGravity gravity_line;
  } tests[] = {
    { PANGO_SCRIPT_ARABIC, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_NORTH },
    { PANGO_SCRIPT_BOPOMOFO, PANGO_GRAVITY_EAST, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH },
    { PANGO_SCRIPT_LATIN, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH },
    { PANGO_SCRIPT_HANGUL, PANGO_GRAVITY_EAST, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH },
    { PANGO_SCRIPT_MONGOLIAN, PANGO_GRAVITY_WEST, PANGO_GRAVITY_SOUTH },
    { PANGO_SCRIPT_OGHAM, PANGO_GRAVITY_WEST, PANGO_GRAVITY_NORTH, PANGO_GRAVITY_SOUTH },
    { PANGO_SCRIPT_TIBETAN, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH, PANGO_GRAVITY_SOUTH },
  };

  for (int i = 0; i < G_N_ELEMENTS (tests); i++)
    {
      g_assert_true (pango_gravity_get_for_script (tests[i].script, PANGO_GRAVITY_AUTO, PANGO_GRAVITY_HINT_STRONG) == tests[i].gravity);

      g_assert_true (pango_gravity_get_for_script_and_width (tests[i].script, FALSE, PANGO_GRAVITY_EAST, PANGO_GRAVITY_HINT_NATURAL) == tests[i].gravity_natural);
      g_assert_true (pango_gravity_get_for_script_and_width (tests[i].script, FALSE, PANGO_GRAVITY_EAST, PANGO_GRAVITY_HINT_STRONG) == PANGO_GRAVITY_EAST);
      g_assert_true (pango_gravity_get_for_script_and_width (tests[i].script, FALSE, PANGO_GRAVITY_EAST, PANGO_GRAVITY_HINT_LINE) == tests[i].gravity_line);
    }
}

#ifdef HAVE_CAIRO_FREETYPE
G_GNUC_BEGIN_IGNORE_DEPRECATIONS

static void
test_language_to_tag (void)
{
  PangoLanguage *lang;
  PangoOTTag tag;
  PangoLanguage *lang2;

  lang = pango_language_from_string ("de");

  tag = pango_ot_tag_from_language (lang);

  lang2 = pango_ot_tag_to_language (tag);

  g_assert_true (lang2 == lang);
}

G_GNUC_END_IGNORE_DEPRECATIONS
#endif

static void
test_fallback_shape (void)
{
  PangoContext *context;
  const char *text;
  GList *items, *l;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  text = "Some text to sha​pe ﺄﻧﺍ ﻕﺍﺩﺭ ﻊﻟﻯ ﺄﻜﻟ ﺎﻟﺰﺟﺎﺟ ﻭ ﻩﺫﺍ ﻻ ﻱﺆﻠﻤﻨﻳ";
  items = pango_itemize (context, text, 0, strlen (text), NULL, NULL);
  for (l = items; l; l = l->next)
    {
      PangoItem *item = l->data;
      PangoGlyphString *glyphs;

      /* We want to test fallback shaping, which happens when we don't have a font */
      g_clear_object (&item->analysis.font);

      glyphs = pango_glyph_string_new ();
      pango_shape_full (text + item->offset, item->length, NULL, 0, &item->analysis, glyphs);

      for (int i = 0; i < glyphs->num_glyphs; i++)
        {
          PangoGlyph glyph = glyphs->glyphs[i].glyph;
          g_assert_true (glyph == PANGO_GLYPH_EMPTY || (glyph & PANGO_GLYPH_UNKNOWN_FLAG));
        }

      pango_glyph_string_free (glyphs);
    }

  g_list_free_full (items, (GDestroyNotify)pango_item_free);

  g_object_unref (context);
}

/* https://bugzilla.gnome.org/show_bug.cgi?id=547303 */
static void
test_get_cursor_crash (void)
{
  PangoContext *context;
  PangoLayout *layout;
  int i;

  const char *string = "foo\n\rbar\r\nbaz\n\nqux\n\n..";

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  layout = pango_layout_new (context);

  pango_layout_set_text (layout, string, -1);

  for (i = 0; string[i]; i++)
    {
      PangoRectangle rectA, rectB;

      pango_layout_get_cursor_pos (layout, i, &rectA, &rectB);
      g_assert_cmpint (rectA.x, ==, rectB.x);
    }

  g_object_unref (layout);
  g_object_unref (context);
}

/* Test that get_cursor returns split cursors in the
 * expected situations. In particular, this was broken
 * at the end of the string here.
 */
static void
test_get_cursor (void)
{
  const char *text = "abאב";
  PangoContext *context;
  PangoLayout *layout;
  PangoRectangle strong, weak;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  layout = pango_layout_new (context);
  pango_layout_set_text (layout, text, -1);

  pango_layout_get_cursor_pos (layout, 0, &strong, &weak);
  g_assert_cmpint (strong.x, ==, weak.x);

  pango_layout_get_cursor_pos (layout, 1, &strong, &weak);
  g_assert_cmpint (strong.x, ==, weak.x);

  pango_layout_get_cursor_pos (layout, 2, &strong, &weak);
  g_assert_cmpint (strong.x, !=, weak.x);

  pango_layout_get_cursor_pos (layout, 4, &strong, &weak);
  g_assert_cmpint (strong.x, ==, weak.x);

  pango_layout_get_cursor_pos (layout, 6, &strong, &weak);
  g_assert_cmpint (strong.x, !=, weak.x);

  g_object_unref (layout);
  g_object_unref (context);
}

static void
test_index_to_x (void)
{
  PangoContext *context;
  const char *tests[] = {
    "ac­ual­ly", // soft hyphen
    "ac​ual​ly", // zero-width space
  };

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  for (int i = 0; i < G_N_ELEMENTS (tests); i++)
    {
      PangoLayout *layout;
      const char *text;
      const char *p;

      layout = pango_layout_new (context);
      pango_layout_set_text (layout, tests[i], -1);
      text = pango_layout_get_text (layout);

      for (p = text; *p; p = g_utf8_next_char (p))
        {
          int index = p - text;
          int l;
          PangoLayoutLine *line;
          int x;
          int index2, trailing;
          gunichar ch;

          ch = g_utf8_get_char (p);

          pango_layout_index_to_line_x (layout, index, FALSE, &l, NULL);
          line = pango_layout_get_line (layout, l);
          g_assert_nonnull (line);

          pango_layout_line_index_to_x (line, index, 0, &x);
          pango_layout_line_x_to_index (line, x, &index2, &trailing);
          if (!pango_is_zero_width (ch))
            g_assert_cmpint (index, ==, index2);
        }

      g_object_unref (layout);
    }

  g_object_unref (context);
}

static gboolean
pango_rectangle_contains (const PangoRectangle *r1,
                          const PangoRectangle *r2)
{
  return r2->x >= r1->x &&
         r2->y >= r1->y &&
         r2->x + r2->width <= r1->x + r1->width &&
         r2->y + r2->height <= r1->y + r1->height;
}

static void
test_extents (void)
{
  PangoContext *context;
  const char *tests[] = {
    "Some long text that has multiple lines that are wrapped by Pango."
  };

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  for (int i = 0; i < G_N_ELEMENTS (tests); i++)
    {
      PangoLayout *layout;
      PangoLayoutIter *iter;
      PangoRectangle layout_extents;
      PangoRectangle line_extents;
      PangoRectangle run_extents;
      PangoRectangle cluster_extents;
      PangoRectangle char_extents;
      PangoRectangle pos;

      layout = pango_layout_new (context);
      pango_layout_set_text (layout, tests[i], -1);
      pango_layout_set_width (layout, 60 * PANGO_SCALE);

      pango_layout_get_extents (layout, NULL, &layout_extents);

      iter = pango_layout_get_iter (layout);

      do
        {
          pango_layout_iter_get_line_extents (iter, NULL, &line_extents);
          pango_layout_iter_get_run_extents (iter, NULL, &run_extents);
          pango_layout_iter_get_cluster_extents (iter, NULL, &cluster_extents);
          pango_layout_iter_get_char_extents (iter, &char_extents);

          pango_layout_index_to_pos (layout,
                                     pango_layout_iter_get_index (iter),
                                     &pos);
          if (pos.width < 0)
            {
              pos.x += pos.width;
              pos.width = - pos.width;
            }

          g_assert_true (pango_rectangle_contains (&layout_extents, &line_extents));
          g_assert_true (pango_rectangle_contains (&line_extents, &run_extents));
          g_assert_true (pango_rectangle_contains (&run_extents, &cluster_extents));
          g_assert_true (pango_rectangle_contains (&cluster_extents, &char_extents));

          g_assert_true (pango_rectangle_contains (&line_extents, &pos));
        }
      while (pango_layout_iter_next_char (iter));

      pango_layout_iter_free (iter);
      g_object_unref (layout);
    }

  g_object_unref (context);
}

static void
test_empty_line_height (void)
{
  PangoContext *context;
  PangoLayout *layout;
  PangoRectangle ext1, ext2, ext3;
  cairo_font_options_t *options;
  int hint;

  context = pango_font_map_create_context (pango_cairo_font_map_get_default ());

  for (hint = CAIRO_HINT_METRICS_OFF; hint <= CAIRO_HINT_METRICS_ON; hint++)
    {
      options = cairo_font_options_create ();
      cairo_font_options_set_hint_metrics (options, hint);
      pango_cairo_context_set_font_options (context, options);
      cairo_font_options_destroy (options);

      layout = pango_layout_new (context);

      pango_layout_get_extents (layout, NULL, &ext1);

      pango_layout_set_text (layout, "a", 1);

      pango_layout_get_extents (layout, NULL, &ext2);

      g_assert_cmpint (ext1.height, ==, ext2.height);

      pango_layout_set_text (layout, "Pg", 1);

      pango_layout_get_extents (layout, NULL, &ext3);

      g_assert_cmpint (ext2.height, ==, ext3.height);

      g_object_unref (layout);
    }

  g_object_unref (context);
}

int
main (int argc, char *argv[])
{
  g_test_init (&argc, &argv, NULL);

  g_test_add_func ("/layout/shape-tab-crash", test_shape_tab_crash);
  g_test_add_func ("/layout/itemize-empty-crash", test_itemize_empty_crash);
  g_test_add_func ("/layout/itemize-utf8", test_itemize_utf8);
  g_test_add_func ("/layout/short-string-crash", test_short_string_crash);
  g_test_add_func ("/language/emoji-crash", test_language_emoji_crash);
  g_test_add_func ("/layout/line-height", test_line_height);
  g_test_add_func ("/layout/line-height2", test_line_height2);
  g_test_add_func ("/layout/line-height3", test_line_height3);
  g_test_add_func ("/layout/run-height", test_run_height);
  g_test_add_func ("/layout/cursor-height", test_cursor_height);
  g_test_add_func ("/layout/cursor-height2", test_cursor_height2);
  g_test_add_func ("/attr-list/update", test_attr_list_update);
  g_test_add_func ("/misc/version-info", test_version_info);
  g_test_add_func ("/misc/is-zerowidth", test_is_zero_width);
  g_test_add_func ("/gravity/to-rotation", test_gravity_to_rotation);
  g_test_add_func ("/gravity/from-matrix", test_gravity_from_matrix);
  g_test_add_func ("/gravity/for-script", test_gravity_for_script);
  g_test_add_func ("/layout/fallback-shape", test_fallback_shape);
#ifdef HAVE_CAIRO_FREETYPE
  g_test_add_func ("/language/to-tag", test_language_to_tag);
#endif
  g_test_add_func ("/bidi/get-cursor-crash", test_get_cursor_crash);
  g_test_add_func ("/bidi/get-cursor", test_get_cursor);
  g_test_add_func ("/layout/index-to-x", test_index_to_x);
  g_test_add_func ("/layout/extents", test_extents);
  g_test_add_func ("/layout/empty-line-height", test_empty_line_height);

  return g_test_run ();
}