/* GTK - The GIMP Toolkit
 * Copyright (C) 2011 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include "gtkcsscornervalueprivate.h"

#include "gtkcssnumbervalueprivate.h"

struct _GtkCssValue {
  GTK_CSS_VALUE_BASE
  GtkCssValue *x;
  GtkCssValue *y;
};

static void
gtk_css_value_corner_free (GtkCssValue *value)
{
  _gtk_css_value_unref (value->x);
  _gtk_css_value_unref (value->y);

  g_slice_free (GtkCssValue, value);
}

static GtkCssValue *
gtk_css_value_corner_compute (GtkCssValue             *corner,
                              guint                    property_id,
                              GtkStyleProviderPrivate *provider,
                              GtkCssComputedValues    *values,
                              GtkCssComputedValues    *parent_values,
                              GtkCssDependencies      *dependencies)
{
  GtkCssValue *x, *y;
  GtkCssDependencies x_deps, y_deps;

  x = _gtk_css_value_compute (corner->x, property_id, provider, values, parent_values, &x_deps);
  y = _gtk_css_value_compute (corner->y, property_id, provider, values, parent_values, &y_deps);
  *dependencies = _gtk_css_dependencies_union (x_deps, y_deps);
  if (x == corner->x && y == corner->y)
    {
      _gtk_css_value_unref (x);
      _gtk_css_value_unref (y);
      return _gtk_css_value_ref (corner);
    }

  return _gtk_css_corner_value_new (x, y);
}

static gboolean
gtk_css_value_corner_equal (const GtkCssValue *corner1,
                            const GtkCssValue *corner2)
{
  return _gtk_css_value_equal (corner1->x, corner2->x)
      && _gtk_css_value_equal (corner1->y, corner2->y);
}

static GtkCssValue *
gtk_css_value_corner_transition (GtkCssValue *start,
                                 GtkCssValue *end,
                                 guint        property_id,
                                 double       progress)
{
  GtkCssValue *x, *y;

  x = _gtk_css_value_transition (start->x, end->x, property_id, progress);
  if (x == NULL)
    return NULL;
  y = _gtk_css_value_transition (start->y, end->y, property_id, progress);
  if (y == NULL)
    {
      _gtk_css_value_unref (x);
      return NULL;
    }

  return _gtk_css_corner_value_new (x, y);
}

static void
gtk_css_value_corner_print (const GtkCssValue *corner,
                           GString           *string)
{
  _gtk_css_value_print (corner->x, string);
  if (!_gtk_css_value_equal (corner->x, corner->y))
    {
      g_string_append_c (string, ' ');
      _gtk_css_value_print (corner->y, string);
    }
}

static const GtkCssValueClass GTK_CSS_VALUE_CORNER = {
  gtk_css_value_corner_free,
  gtk_css_value_corner_compute,
  gtk_css_value_corner_equal,
  gtk_css_value_corner_transition,
  gtk_css_value_corner_print
};

GtkCssValue *
_gtk_css_corner_value_new (GtkCssValue *x,
                           GtkCssValue *y)
{
  GtkCssValue *result;

  result = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_CORNER);
  result->x = x;
  result->y = y;

  return result;
}

GtkCssValue *
_gtk_css_corner_value_parse (GtkCssParser *parser)
{
  GtkCssValue *x, *y;

  x = _gtk_css_number_value_parse (parser,
                                   GTK_CSS_POSITIVE_ONLY
                                   | GTK_CSS_PARSE_PERCENT
                                   | GTK_CSS_NUMBER_AS_PIXELS
                                   | GTK_CSS_PARSE_LENGTH);
  if (x == NULL)
    return NULL;

  if (!_gtk_css_parser_has_number (parser))
    y = _gtk_css_value_ref (x);
  else
    {
      y = _gtk_css_number_value_parse (parser,
                                       GTK_CSS_POSITIVE_ONLY
                                       | GTK_CSS_PARSE_PERCENT
                                       | GTK_CSS_NUMBER_AS_PIXELS
                                       | GTK_CSS_PARSE_LENGTH);
      if (y == NULL)
        {
          _gtk_css_value_unref (x);
          return NULL;
        }
    }

  return _gtk_css_corner_value_new (x, y);
}

double
_gtk_css_corner_value_get_x (const GtkCssValue *corner,
                             double             one_hundred_percent)
{
  g_return_val_if_fail (corner != NULL, 0.0);
  g_return_val_if_fail (corner->class == &GTK_CSS_VALUE_CORNER, 0.0);

  return _gtk_css_number_value_get (corner->x, one_hundred_percent);
}

double
_gtk_css_corner_value_get_y (const GtkCssValue *corner,
                             double             one_hundred_percent)
{
  g_return_val_if_fail (corner != NULL, 0.0);
  g_return_val_if_fail (corner->class == &GTK_CSS_VALUE_CORNER, 0.0);

  return _gtk_css_number_value_get (corner->y, one_hundred_percent);
}