/* -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * Copyright (C) 2008 William Jon McCann <jmccann@redhat.com>
 * Copyright (C) 2010 Intel, Inc
 * Copyright 2022 Mohammed Sadiq <sadiq@sadiqpk.org>
 * Copyright 2022 Purism SPC
 *
 * Licensed under the GNU General Public License Version 2
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Author(s):
 *   Thomas Wood <thomas.wood@intel.com>
 *   Rodrigo Moya <rodrigo@gnome.org>
 *   Mohammed Sadiq <sadiq@sadiqpk.org>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "cc-ua-seeing-page"

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <glib/gi18n-lib.h>

#include "cc-list-row.h"
#include "cc-cursor-size-dialog.h"
#include "cc-ua-macros.h"
#include "cc-ua-seeing-page.h"

struct _CcUaSeeingPage
{
  AdwPreferencesPage  parent_instance;

  CcListRow          *high_contrast_row;
  CcListRow          *animations_row;
  CcListRow          *large_text_row;
  CcListRow          *cursor_size_row;
  CcListRow          *sound_keys_row;
  CcListRow          *overlay_scrollbars_row;

  CcListRow          *screen_reader_row;

  GSettings          *kb_settings;
  GSettings          *interface_settings;
  GSettings          *application_settings;
  GSettings          *a11y_interface_settings;

  char               *old_gtk_theme;
  char               *old_icon_theme;

  gboolean            is_self_change;
};

G_DEFINE_TYPE (CcUaSeeingPage, cc_ua_seeing_page, ADW_TYPE_PREFERENCES_PAGE)

static gboolean
get_large_text_mapping (GValue   *value,
                        GVariant *variant,
                        gpointer  user_data)
{
  gdouble factor;

  factor = g_variant_get_double (variant);
  g_value_set_boolean (value, factor > DPI_FACTOR_NORMAL);

  return TRUE;
}

static GVariant *
set_large_text_mapping (const GValue       *value,
                        const GVariantType *expected_type,
                        gpointer            user_data)
{
  GSettings *settings = user_data;

  if (g_value_get_boolean (value))
    return g_variant_new_double (DPI_FACTOR_LARGE);

  g_settings_reset (settings, KEY_TEXT_SCALING_FACTOR);

  return NULL;
}

static void
ua_seeing_interface_cursor_size_changed_cb (CcUaSeeingPage *self)
{
  const char *label;
  int cursor_size;

  g_assert (CC_IS_UA_SEEING_PAGE (self));

  cursor_size = g_settings_get_int (self->interface_settings, KEY_MOUSE_CURSOR_SIZE);

  switch (cursor_size)
    {
    case 24:
      /* translators: the labels will read:
       * Cursor Size: Default */
      label = g_strdup (C_("cursor size", "Default"));
      break;
    case 32:
      label = g_strdup (C_("cursor size", "Medium"));
      break;
    case 48:
      label = g_strdup (C_("cursor size", "Large"));
      break;
    case 64:
      label = g_strdup (C_("cursor size", "Larger"));
      break;
    case 96:
      label = g_strdup (C_("cursor size", "Largest"));
      break;
    default:
      label = g_strdup_printf (g_dngettext (GETTEXT_PACKAGE,
                                            "%d pixel",
                                            "%d pixels",
                                            cursor_size),
                               cursor_size);
      break;
    }

  cc_list_row_set_secondary_label (self->cursor_size_row, label);
}

static void
ua_seeing_a11y_high_contrast_changed_cb (CcUaSeeingPage *self)
{
  g_assert (CC_IS_UA_SEEING_PAGE (self));

  self->is_self_change = TRUE;

  if (g_settings_get_boolean (self->a11y_interface_settings, KEY_HIGH_CONTRAST))
    {
      /* xxx: Should we not set high contrast icons? */
      g_settings_set_string (self->interface_settings, KEY_ICON_THEME, HIGH_CONTRAST_THEME);
    }
  else
    {
      if (self->old_icon_theme && !g_str_equal (self->old_gtk_theme, HIGH_CONTRAST_THEME))
        g_settings_set_string (self->interface_settings, KEY_ICON_THEME, self->old_icon_theme);
      else
        g_settings_reset (self->interface_settings, KEY_ICON_THEME);
    }

  self->is_self_change = FALSE;
}

static void
ua_seeing_interface_settings_changed_cb (CcUaSeeingPage *self)
{
  g_assert (CC_IS_UA_SEEING_PAGE (self));

  if (self->is_self_change)
    return;

  g_free (self->old_gtk_theme);
  g_free (self->old_icon_theme);

  self->old_gtk_theme = g_settings_get_string (self->interface_settings, KEY_GTK_THEME);
  self->old_icon_theme = g_settings_get_string (self->interface_settings, KEY_ICON_THEME);
}

static void
ua_cursor_row_activated_cb (CcUaSeeingPage *self)
{
  GtkWindow *dialog;
  GtkNative *native;

  g_assert (CC_IS_UA_SEEING_PAGE (self));

  dialog = GTK_WINDOW (cc_cursor_size_dialog_new ());
  native = gtk_widget_get_native (GTK_WIDGET (self));

  gtk_window_set_transient_for (dialog, GTK_WINDOW (native));
  gtk_window_present (dialog);
}

static void
cc_ua_seeing_page_dispose (GObject *object)
{
  CcUaSeeingPage *self = (CcUaSeeingPage *)object;

  g_clear_object (&self->kb_settings);
  g_clear_object (&self->interface_settings);
  g_clear_object (&self->application_settings);
  g_clear_object (&self->a11y_interface_settings);

  g_clear_pointer (&self->old_gtk_theme, g_free);
  g_clear_pointer (&self->old_icon_theme, g_free);

  G_OBJECT_CLASS (cc_ua_seeing_page_parent_class)->dispose (object);
}

static void
cc_ua_seeing_page_class_init (CcUaSeeingPageClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  object_class->dispose = cc_ua_seeing_page_dispose;

  gtk_widget_class_set_template_from_resource (widget_class,
                                               "/org/gnome/control-center/"
                                               "universal-access/cc-ua-seeing-page.ui");

  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, high_contrast_row);
  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, animations_row);
  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, large_text_row);
  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, cursor_size_row);
  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, sound_keys_row);
  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, overlay_scrollbars_row);

  gtk_widget_class_bind_template_child (widget_class, CcUaSeeingPage, screen_reader_row);

  gtk_widget_class_bind_template_callback (widget_class, ua_cursor_row_activated_cb);
}

static void
cc_ua_seeing_page_init (CcUaSeeingPage *self)
{
  gtk_widget_init_template (GTK_WIDGET (self));

  self->kb_settings = g_settings_new (KEYBOARD_SETTINGS);
  self->interface_settings = g_settings_new (INTERFACE_SETTINGS);
  self->application_settings = g_settings_new (APPLICATION_SETTINGS);
  self->a11y_interface_settings = g_settings_new (A11Y_INTERFACE_SETTINGS);

  /* High contrast */
  g_settings_bind (self->a11y_interface_settings, KEY_HIGH_CONTRAST,
                   self->high_contrast_row, "active",
                   G_SETTINGS_BIND_DEFAULT);

  /* Enable Animations */
  g_settings_bind (self->interface_settings, KEY_ENABLE_ANIMATIONS,
                   self->animations_row, "active",
                   G_SETTINGS_BIND_DEFAULT | G_SETTINGS_BIND_INVERT_BOOLEAN);

  /* Large Text */
  g_settings_bind_with_mapping (self->interface_settings, KEY_TEXT_SCALING_FACTOR,
                                self->large_text_row,
                                "active", G_SETTINGS_BIND_DEFAULT,
                                get_large_text_mapping,
                                set_large_text_mapping,
                                self->interface_settings,
                                NULL);

  /* Sound Keys */
  g_settings_bind (self->kb_settings, KEY_TOGGLEKEYS_ENABLED,
                   self->sound_keys_row, "active",
                   G_SETTINGS_BIND_DEFAULT);

  /* Overlay Scrollbars */
  g_settings_bind (self->interface_settings, KEY_OVERLAY_SCROLLING,
                   self->overlay_scrollbars_row, "active",
                   G_SETTINGS_BIND_DEFAULT);

  /* Screen Reader */
  g_settings_bind (self->application_settings, KEY_SCREEN_READER_ENABLED,
                   self->screen_reader_row, "active",
                   G_SETTINGS_BIND_DEFAULT);

  g_signal_connect_object (self->interface_settings, "changed::" KEY_MOUSE_CURSOR_SIZE,
                           G_CALLBACK (ua_seeing_interface_cursor_size_changed_cb),
                           self, G_CONNECT_SWAPPED | G_CONNECT_AFTER);

  g_signal_connect_object (self->a11y_interface_settings, "changed::" KEY_HIGH_CONTRAST,
                           G_CALLBACK (ua_seeing_a11y_high_contrast_changed_cb),
                           self, G_CONNECT_SWAPPED | G_CONNECT_AFTER);

  g_signal_connect_object (self->interface_settings, "changed",
                           G_CALLBACK (ua_seeing_interface_settings_changed_cb),
                           self, G_CONNECT_SWAPPED | G_CONNECT_AFTER);

  ua_seeing_interface_settings_changed_cb (self);
  ua_seeing_interface_cursor_size_changed_cb (self);
}

GtkWidget *
cc_ua_seeing_page_new (void)
{
  return g_object_new (CC_TYPE_UA_SEEING_PAGE, NULL);
}
