/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
 *
 * Copyright (C) 2018 Red Hat, Inc
 * Copyright (C) 2020 Collabora Ltd.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * Author: Matthias Clasen <mclasen@redhat.com>
 */

#include "list-box-helper.h"
#include "cc-lock-panel.h"
#include "cc-lock-resources.h"
#include "cc-util.h"

#include <gio/gdesktopappinfo.h>
#include <glib/gi18n.h>

struct _CcLockPanel
{
  CcPanel        parent_instance;

  GSettings     *lock_settings;
  GSettings     *notification_settings;
  GSettings     *privacy_settings;
  GSettings     *session_settings;

  GCancellable  *cancellable;

  GtkSwitch     *automatic_screen_lock_switch;
  GtkComboBox   *blank_screen_combo;
  GtkComboBox   *lock_after_combo;
  GtkListBox    *lock_list_box;
  GtkSwitch     *show_notifications_switch;
  GtkSwitch     *usb_protection_switch;
  GDBusProxy    *usb_proxy;
  GtkListBoxRow *usb_protection_row;
};

CC_PANEL_REGISTER (CcLockPanel, cc_lock_panel)

static void
on_lock_combo_changed_cb (GtkWidget   *widget,
                          CcLockPanel *self)
{
  GtkTreeIter iter;
  GtkTreeModel *model;
  guint delay;
  gboolean ret;

  ret = gtk_combo_box_get_active_iter (GTK_COMBO_BOX (widget), &iter);
  if (!ret)
    return;

  model = gtk_combo_box_get_model (GTK_COMBO_BOX (widget));
  gtk_tree_model_get (model, &iter,
                      1, &delay,
                      -1);
  g_settings_set (self->lock_settings, "lock-delay", "u", delay);
}

static void
set_lock_value_for_combo (GtkComboBox *combo_box,
                          CcLockPanel *self)
{
  GtkTreeIter iter;
  GtkTreeModel *model;
  guint value;
  gint value_tmp, value_prev;
  gboolean ret;
  guint i;

  model = gtk_combo_box_get_model (combo_box);
  ret = gtk_tree_model_get_iter_first (model, &iter);
  if (!ret)
    return;

  value_prev = 0;
  i = 0;

  g_settings_get (self->lock_settings, "lock-delay", "u", &value);
  do
    {
      gtk_tree_model_get (model,
                          &iter,
                          1, &value_tmp,
                          -1);
      if (value == value_tmp ||
          (value_tmp > value_prev && value < value_tmp))
        {
          gtk_combo_box_set_active_iter (combo_box, &iter);
          return;
        }
      value_prev = value_tmp;
      i++;
    }
  while (gtk_tree_model_iter_next (model, &iter));

  gtk_combo_box_set_active (combo_box, i - 1);
}

static void
set_blank_screen_delay_value (CcLockPanel *self,
                              gint         value)
{
  g_autoptr(GtkTreeIter) insert = NULL;
  g_autofree gchar *text = NULL;
  GtkTreeIter iter;
  GtkTreeIter new;
  GtkTreeModel *model;
  gint value_tmp;
  gint value_last = 0;
  gboolean ret;

  /* get entry */
  model = gtk_combo_box_get_model (self->blank_screen_combo);
  ret = gtk_tree_model_get_iter_first (model, &iter);
  if (!ret)
    return;

  /* try to make the UI match the setting */
  do
    {
      gtk_tree_model_get (model,
                          &iter,
                          1, &value_tmp,
                          -1);
      if (value_tmp == value)
        {
          gtk_combo_box_set_active_iter (self->blank_screen_combo, &iter);
          return;
        }

      /* Insert before if the next value is larger or the value is lower
       * again (i.e. "Never" is zero and last). */
      if (!insert && (value_tmp > value || value_last > value_tmp))
        insert = gtk_tree_iter_copy (&iter);

      value_last = value_tmp;
    } while (gtk_tree_model_iter_next (model, &iter));

  /* The value is not listed, so add it at the best point (or the end). */
  gtk_list_store_insert_before (GTK_LIST_STORE (model), &new, insert);

  text = cc_util_time_to_string_text (value * 1000);
  gtk_list_store_set (GTK_LIST_STORE (model), &new,
                      0, text,
                      1, value,
                      -1);
  gtk_combo_box_set_active_iter (self->blank_screen_combo, &new);
}

static void
on_blank_screen_delay_changed_cb (GtkWidget   *widget,
                                  CcLockPanel *self)
{
  GtkTreeIter iter;
  GtkTreeModel *model;
  gint value;
  gboolean ret;

  /* no selection */
  ret = gtk_combo_box_get_active_iter (GTK_COMBO_BOX (widget), &iter);
  if (!ret)
    return;

  /* get entry */
  model = gtk_combo_box_get_model (GTK_COMBO_BOX(widget));
  gtk_tree_model_get (model, &iter,
                      1, &value,
                      -1);

  /* set both keys */
  g_settings_set_uint (self->session_settings, "idle-delay", value);
}

static void
on_usb_protection_properties_changed_cb (GDBusProxy  *usb_proxy,
                                         GVariant    *changed_properties,
                                         GStrv        invalidated_properties,
                                         CcLockPanel *self)
{
  gboolean available = FALSE;

  if (self->usb_proxy)
    {
      g_autoptr(GVariant) variant = NULL;

      variant = g_dbus_proxy_get_cached_property (self->usb_proxy, "Available");
      if (variant != NULL)
        available = g_variant_get_boolean (variant);
    }

  /* Show the USB protection row only if the required daemon is up and running */
  gtk_widget_set_visible (GTK_WIDGET (self->usb_protection_row), available);
}

static void
on_usb_protection_param_ready (GObject      *source_object,
                               GAsyncResult *res,
                               gpointer      user_data)
{
  g_autoptr(GError) error = NULL;
  CcLockPanel *self;
  GDBusProxy *proxy;

  self = user_data;
  proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
  if (error)
    {
      if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
        {
          g_warning ("Failed to connect to SettingsDaemon.UsbProtection: %s",
                     error->message);
        }

      gtk_widget_hide (GTK_WIDGET (self->usb_protection_row));
      return;
    }
  self->usb_proxy = proxy;

  g_signal_connect_object (self->usb_proxy,
                           "g-properties-changed",
                           G_CALLBACK (on_usb_protection_properties_changed_cb),
                           self,
                           0);
  on_usb_protection_properties_changed_cb (self->usb_proxy, NULL, NULL, self);
}

static void
cc_lock_panel_finalize (GObject *object)
{
  CcLockPanel *self = CC_LOCK_PANEL (object);

  g_cancellable_cancel (self->cancellable);
  g_clear_object (&self->cancellable);
  g_clear_object (&self->lock_settings);
  g_clear_object (&self->notification_settings);
  g_clear_object (&self->session_settings);
  g_clear_object (&self->usb_proxy);

  G_OBJECT_CLASS (cc_lock_panel_parent_class)->finalize (object);
}

static void
cc_lock_panel_class_init (CcLockPanelClass *klass)
{
  GObjectClass *oclass = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  oclass->finalize = cc_lock_panel_finalize;

  gtk_widget_class_set_template_from_resource (widget_class, "/io/github/scarecrow_de/control-center/lock/cc-lock-panel.ui");

  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, automatic_screen_lock_switch);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, blank_screen_combo);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, lock_after_combo);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, lock_list_box);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, show_notifications_switch);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, usb_protection_switch);
  gtk_widget_class_bind_template_child (widget_class, CcLockPanel, usb_protection_row);

  gtk_widget_class_bind_template_callback (widget_class, on_blank_screen_delay_changed_cb);
  gtk_widget_class_bind_template_callback (widget_class, on_lock_combo_changed_cb);
}

static void
cc_lock_panel_init (CcLockPanel *self)
{
  guint value;

  g_resources_register (cc_lock_get_resource ());

  gtk_widget_init_template (GTK_WIDGET (self));

  gtk_list_box_set_header_func (self->lock_list_box,
                                cc_list_box_update_header_func,
                                NULL, NULL);

  self->cancellable = g_cancellable_new ();

  self->lock_settings = g_settings_new ("io.github.scarecrow_de.desktop.screensaver");
  self->privacy_settings = g_settings_new ("io.github.scarecrow_de.desktop.privacy");
  self->notification_settings = g_settings_new ("io.github.scarecrow_de.desktop.notifications");
  self->session_settings = g_settings_new ("io.github.scarecrow_de.desktop.session");

  g_settings_bind (self->lock_settings,
                   "lock-enabled",
                   self->automatic_screen_lock_switch,
                   "active",
                   G_SETTINGS_BIND_DEFAULT);

  g_settings_bind (self->lock_settings,
                   "lock-enabled",
                   self->lock_after_combo,
                   "sensitive",
                   G_SETTINGS_BIND_GET);

  set_lock_value_for_combo (self->lock_after_combo, self);

  g_settings_bind (self->notification_settings,
                   "show-in-lock-screen",
                   self->show_notifications_switch,
                   "active",
                   G_SETTINGS_BIND_DEFAULT);

  value = g_settings_get_uint (self->session_settings, "idle-delay");
  set_blank_screen_delay_value (self, value);

  g_settings_bind (self->privacy_settings,
                   "usb-protection",
                   self->usb_protection_switch,
                   "active",
                   G_SETTINGS_BIND_DEFAULT);

  g_dbus_proxy_new_for_bus (G_BUS_TYPE_SESSION,
                            G_DBUS_PROXY_FLAGS_NONE,
                            NULL,
                            "io.github.scarecrow_de.SettingsDaemon.UsbProtection",
                            "/io/github/scarecrow_de/SettingsDaemon/UsbProtection",
                            "io.github.scarecrow_de.SettingsDaemon.UsbProtection",
                            self->cancellable,
                            on_usb_protection_param_ready,
                            self);
}
