/*
 * Copyright (c) 2014 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 "visual.h"

struct _GtkInspectorVisualPrivate
{
  GtkWidget *direction_combo;
  GtkWidget *updates_switch;
  GtkWidget *baselines_switch;
  GtkWidget *pixelcache_switch;

  GtkWidget *theme_combo;
  GtkWidget *dark_switch;
  GtkWidget *icon_combo;
};

G_DEFINE_TYPE_WITH_PRIVATE (GtkInspectorVisual, gtk_inspector_visual, GTK_TYPE_BOX)

static void
fix_direction_recurse (GtkWidget *widget,
                       gpointer   data)
{
  GtkTextDirection dir = GPOINTER_TO_INT (data);

  g_object_ref (widget);

  gtk_widget_set_direction (widget, dir);
  if (GTK_IS_CONTAINER (widget))
    gtk_container_forall (GTK_CONTAINER (widget), fix_direction_recurse, data);

  g_object_unref (widget);
}

static GtkTextDirection initial_direction;

static void
fix_direction (GtkWidget *iw)
{
  fix_direction_recurse (iw, GINT_TO_POINTER (initial_direction));
}

static void
direction_changed (GtkComboBox *combo)
{
  GtkWidget *iw;
  const gchar *direction;

  iw = gtk_widget_get_toplevel (GTK_WIDGET (combo));
  fix_direction (iw);

  direction = gtk_combo_box_get_active_id (combo);
  if (g_strcmp0 (direction, "ltr") == 0)
    gtk_widget_set_default_direction (GTK_TEXT_DIR_LTR);
  else
    gtk_widget_set_default_direction (GTK_TEXT_DIR_RTL);
}

static void
init_direction (GtkInspectorVisual *vis)
{
  const gchar *direction;

  initial_direction = gtk_widget_get_default_direction ();
  if (initial_direction == GTK_TEXT_DIR_LTR)
    direction = "ltr";
  else
    direction = "rtl";
  gtk_combo_box_set_active_id (GTK_COMBO_BOX (vis->priv->direction_combo), direction);
}

static void
redraw_everything (void)
{
  GList *toplevels;
  toplevels = gtk_window_list_toplevels ();
  g_list_foreach (toplevels, (GFunc) gtk_widget_queue_draw, NULL);
  g_list_free (toplevels);
}

void
updates_activate (GtkSwitch *sw)
{
  gdk_window_set_debug_updates (gtk_switch_get_active (sw));
  redraw_everything ();
}

static void
baselines_activate (GtkSwitch *sw)
{
  guint flags;

  flags = gtk_get_debug_flags ();

  if (gtk_switch_get_active (sw))
    flags |= GTK_DEBUG_BASELINES;
  else
    flags &= ~GTK_DEBUG_BASELINES;

  gtk_set_debug_flags (flags);
  redraw_everything ();
}

static void
pixelcache_activate (GtkSwitch *sw)
{
  guint flags;

  flags = gtk_get_debug_flags ();

  if (gtk_switch_get_active (sw))
    flags |= GTK_DEBUG_PIXEL_CACHE;
  else
    flags &= ~GTK_DEBUG_PIXEL_CACHE;

  gtk_set_debug_flags (flags);
  /* FIXME: this doesn't work, because it is redrawing
   * _from_ the cache. We need to recurse over the tree
   * and invalidate the pixel cache of every widget that
   * has one.
   */
  redraw_everything ();
}

static void
fill_gtk (const gchar *path,
          GHashTable  *t)
{
  const gchar *dir_entry;
  GDir *dir = g_dir_open (path, 0, NULL);

  if (!dir)
    return;

  while ((dir_entry = g_dir_read_name (dir)))
    {
      gchar *filename = g_build_filename (path, dir_entry, "gtk-3.0", "gtk.css", NULL);

      if (g_file_test (filename, G_FILE_TEST_IS_REGULAR) &&
          !g_hash_table_contains (t, dir_entry))
        g_hash_table_add (t, g_strdup (dir_entry));

      g_free (filename);
    }
}

static void
init_theme (GtkInspectorVisual *vis)
{
  GHashTable *t;
  GHashTableIter iter;
  gchar *theme, *current_theme, *path;
  gint i, pos;
  GSettings *settings;

  t = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
  g_hash_table_add (t, g_strdup ("Raleigh"));

  fill_gtk (GTK_DATADIR "/themes", t);
  path = g_build_filename (g_get_user_data_dir (), "themes", NULL);
  fill_gtk (path, t);
  g_free (path);

  settings = g_settings_new ("org.gnome.desktop.interface");
  current_theme = g_settings_get_string (settings, "gtk-theme");
  g_object_unref (settings);

  g_hash_table_iter_init (&iter, t);
  pos = i = 0;
  while (g_hash_table_iter_next (&iter, (gpointer *)&theme, NULL))
    {
      gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (vis->priv->theme_combo), theme);
      if (g_strcmp0 (theme, current_theme) == 0)
        pos = i;
      i++;
    }
  g_hash_table_destroy (t);

  gtk_combo_box_set_active (GTK_COMBO_BOX (vis->priv->theme_combo), pos);
}

static void
theme_changed (GtkComboBox        *c,
               GtkInspectorVisual *vis)
{
  gchar *theme;

  theme = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT (c));
  g_object_set (gtk_settings_get_default (), "gtk-theme-name", theme, NULL);
  g_free (theme);
}

static void
init_dark (GtkInspectorVisual *vis)
{
  g_object_bind_property (vis->priv->dark_switch, "active",
                          gtk_settings_get_default (), "gtk-application-prefer-dark-theme",
                          G_BINDING_BIDIRECTIONAL);
}

static void
fill_icons (const gchar *path,
            GHashTable  *t)
{
  const gchar *dir_entry;
  GDir *dir;

  dir = g_dir_open (path, 0, NULL);
  if (!dir)
    return;

  while ((dir_entry = g_dir_read_name (dir)))
    {
      gchar *filename = g_build_filename (path, dir_entry, "index.theme", NULL);

      if (g_file_test (filename, G_FILE_TEST_IS_REGULAR) &&
          g_strcmp0 (dir_entry, "hicolor") != 0 &&
          !g_hash_table_contains (t, dir_entry))
        g_hash_table_add (t, g_strdup (dir_entry));

      g_free (filename);
    }
}

static void
init_icons (GtkInspectorVisual *vis)
{
  GHashTable *t;
  GHashTableIter iter;
  gchar *theme, *current_theme, *path;
  gint i, pos;
  GSettings *settings;

  t = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);

  fill_icons (GTK_DATADIR "/icons", t);
  path = g_build_filename (g_get_user_data_dir (), "icons", NULL);
  fill_icons (path, t);
  g_free (path);

  settings = g_settings_new ("org.gnome.desktop.interface");
  current_theme = g_settings_get_string (settings, "icon-theme");
  g_object_unref (settings);

  g_hash_table_iter_init (&iter, t);
  pos = i = 0;
  while (g_hash_table_iter_next (&iter, (gpointer *)&theme, NULL))
    {
      gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (vis->priv->icon_combo), theme);
      if (g_strcmp0 (theme, current_theme) == 0)
        pos = i;
      i++;
    }
  g_hash_table_destroy (t);

  gtk_combo_box_set_active (GTK_COMBO_BOX (vis->priv->icon_combo), pos);
}

static void
icons_changed (GtkComboBox        *c,
               GtkInspectorVisual *vis)
{
  gchar *theme = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT (c));
  g_object_set (gtk_settings_get_default (), "gtk-icon-theme-name", theme, NULL);
  g_free (theme);
}

static void
gtk_inspector_visual_init (GtkInspectorVisual *vis)
{
  vis->priv = gtk_inspector_visual_get_instance_private (vis);
  gtk_widget_init_template (GTK_WIDGET (vis));
  init_direction (vis);
  init_theme (vis);
  init_dark (vis);
  init_icons (vis);
}

static void
gtk_inspector_visual_class_init (GtkInspectorVisualClass *klass)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  gtk_widget_class_set_template_from_resource (widget_class, "/org/gtk/inspector/visual.ui");
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, updates_switch);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, direction_combo);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, baselines_switch);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, pixelcache_switch);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, dark_switch);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, theme_combo);
  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, icon_combo);

  gtk_widget_class_bind_template_callback (widget_class, updates_activate);
  gtk_widget_class_bind_template_callback (widget_class, direction_changed);
  gtk_widget_class_bind_template_callback (widget_class, baselines_activate);
  gtk_widget_class_bind_template_callback (widget_class, pixelcache_activate);
  gtk_widget_class_bind_template_callback (widget_class, theme_changed);
  gtk_widget_class_bind_template_callback (widget_class, icons_changed);

}

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