/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */

/*

 * Copyright (C) 2012 Thomas Bechtold <toabctl@gnome.org>

 * Copyright (C) 2017 Sébastien Wilmet <swilmet@gnome.org>

 *

 * 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/>.

 */

#include "config.h"

#include "dh-settings.h"

/* Devhelp GSettings schema IDs */

#define SETTINGS_SCHEMA_ID_WINDOW               "org.gnome.devhelp.state.main.window"

#define SETTINGS_SCHEMA_ID_PANED                "org.gnome.devhelp.state.main.paned"

#define SETTINGS_SCHEMA_ID_CONTENTS             "org.gnome.devhelp.state.main.contents"

#define SETTINGS_SCHEMA_ID_ASSISTANT            "org.gnome.devhelp.state.assistant.window"

#define SETTINGS_SCHEMA_ID_FONTS                "org.gnome.devhelp.fonts"

/* Provided by the gsettings-desktop-schemas module. */

#define SETTINGS_SCHEMA_ID_DESKTOP_INTERFACE    "org.gnome.desktop.interface"

#define SYSTEM_FIXED_FONT_KEY                   "monospace-font-name"

#define SYSTEM_VARIABLE_FONT_KEY                "font-name"

struct _DhSettingsPrivate {

        GSettings *settings_window;

        GSettings *settings_paned;

        GSettings *settings_contents;

        GSettings *settings_assistant;

        GSettings *settings_fonts;

        GSettings *settings_desktop_interface;

};

enum {

        FONTS_CHANGED,

        N_SIGNALS

};

static guint signals[N_SIGNALS] = { 0 };

/* DhSettings is a singleton. */

static DhSettings *singleton = NULL;

G_DEFINE_TYPE_WITH_PRIVATE (DhSettings, dh_settings, G_TYPE_OBJECT);

static void

dh_settings_dispose (GObject *object)

{

        DhSettings *self = DH_SETTINGS (object);

        g_clear_object (&self->priv->settings_window);

        g_clear_object (&self->priv->settings_paned);

        g_clear_object (&self->priv->settings_contents);

        g_clear_object (&self->priv->settings_assistant);

        g_clear_object (&self->priv->settings_fonts);

        g_clear_object (&self->priv->settings_desktop_interface);

        G_OBJECT_CLASS (dh_settings_parent_class)->dispose (object);

}

static void

dh_settings_finalize (GObject *object)

{

        if (singleton == DH_SETTINGS (object))

                singleton = NULL;

        G_OBJECT_CLASS (dh_settings_parent_class)->finalize (object);

}

static void

dh_settings_class_init (DhSettingsClass *klass)

{

        GObjectClass *object_class = G_OBJECT_CLASS (klass);

        object_class->dispose = dh_settings_dispose;

        object_class->finalize = dh_settings_finalize;

        signals[FONTS_CHANGED] =

                g_signal_new ("fonts-changed",

                              G_TYPE_FROM_CLASS (klass),

                              G_SIGNAL_RUN_LAST,

                              G_STRUCT_OFFSET (DhSettingsClass, fonts_changed),

                              NULL, NULL, NULL,

                              G_TYPE_NONE,

                              2,

                              G_TYPE_STRING,

                              G_TYPE_STRING);

}

static void

fonts_changed_cb (GSettings *gsettings,

                  gchar     *key,

                  gpointer   user_data)

{

        DhSettings *self = DH_SETTINGS (user_data);

        gchar *fixed_font = NULL;

        gchar *variable_font = NULL;

        dh_settings_get_selected_fonts (self, &fixed_font, &variable_font);

        g_signal_emit (self, signals[FONTS_CHANGED], 0, fixed_font, variable_font);

        g_free (fixed_font);

        g_free (variable_font);

}

static void

dh_settings_init (DhSettings *self)

{

        self->priv = dh_settings_get_instance_private (self);

        self->priv->settings_window = g_settings_new (SETTINGS_SCHEMA_ID_WINDOW);

        self->priv->settings_paned = g_settings_new (SETTINGS_SCHEMA_ID_PANED);

        self->priv->settings_contents = g_settings_new (SETTINGS_SCHEMA_ID_CONTENTS);

        self->priv->settings_assistant = g_settings_new (SETTINGS_SCHEMA_ID_ASSISTANT);

        self->priv->settings_fonts = g_settings_new (SETTINGS_SCHEMA_ID_FONTS);

        self->priv->settings_desktop_interface = g_settings_new (SETTINGS_SCHEMA_ID_DESKTOP_INTERFACE);

        g_signal_connect_object (self->priv->settings_fonts,

                                 "changed",

                                 G_CALLBACK (fonts_changed_cb),

                                 self,

                                 0);

        g_signal_connect_object (self->priv->settings_desktop_interface,

                                 "changed::" SYSTEM_FIXED_FONT_KEY,

                                 G_CALLBACK (fonts_changed_cb),

                                 self,

                                 0);

        g_signal_connect_object (self->priv->settings_desktop_interface,

                                 "changed::" SYSTEM_VARIABLE_FONT_KEY,

                                 G_CALLBACK (fonts_changed_cb),

                                 self,

                                 0);

}

DhSettings *

dh_settings_get_singleton (void)

{

        if (singleton == NULL)

                singleton = g_object_new (DH_TYPE_SETTINGS, NULL);

        return singleton;

}

void

_dh_settings_unref_singleton (void)

{

        if (singleton != NULL)

                g_object_unref (singleton);

        /* singleton is not set to NULL here, it is set to NULL in

         * dh_settings_finalize() (i.e. when we are sure that the ref count

         * reaches 0).

         */

}

GSettings *

dh_settings_peek_window_settings (DhSettings *self)

{

        g_return_val_if_fail (DH_IS_SETTINGS (self), NULL);

        return self->priv->settings_window;

}

GSettings *

dh_settings_peek_paned_settings (DhSettings *self)

{

        g_return_val_if_fail (DH_IS_SETTINGS (self), NULL);

        return self->priv->settings_paned;

}

GSettings *

dh_settings_peek_contents_settings (DhSettings *self)

{

        g_return_val_if_fail (DH_IS_SETTINGS (self), NULL);

        return self->priv->settings_contents;

}

GSettings *

dh_settings_peek_assistant_settings (DhSettings *self)

{

        g_return_val_if_fail (DH_IS_SETTINGS (self), NULL);

        return self->priv->settings_assistant;

}

GSettings *

dh_settings_peek_fonts_settings (DhSettings *self)

{

        g_return_val_if_fail (DH_IS_SETTINGS (self), NULL);

        return self->priv->settings_fonts;

}

void

dh_settings_get_selected_fonts (DhSettings  *self,

                                gchar      **font_name_fixed,

                                gchar      **font_name_variable)

{

        gboolean use_system_font;

        g_return_if_fail (DH_IS_SETTINGS (self));

        g_return_if_fail (font_name_fixed != NULL && *font_name_fixed == NULL);

        g_return_if_fail (font_name_variable != NULL && *font_name_variable == NULL);

        use_system_font = g_settings_get_boolean (self->priv->settings_fonts, "use-system-fonts");

        if (use_system_font) {

                *font_name_fixed = g_settings_get_string (self->priv->settings_desktop_interface,

                                                          SYSTEM_FIXED_FONT_KEY);

                *font_name_variable = g_settings_get_string (self->priv->settings_desktop_interface,

                                                             SYSTEM_VARIABLE_FONT_KEY);

        } else {

                *font_name_fixed = g_settings_get_string (self->priv->settings_fonts,

                                                          "fixed-font");

                *font_name_variable = g_settings_get_string (self->priv->settings_fonts,

                                                             "variable-font");

        }

}