path: root/modules/cal-config-weather/evolution-cal-config-weather.c

/*
 * evolution-cal-config-weather.c
 *
 * This program 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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <config.h>
#include <glib/gi18n-lib.h>

#include <libebackend/libebackend.h>

#define GWEATHER_I_KNOW_THIS_IS_UNSTABLE
#include <libgweather/location-entry.h>
#undef GWEATHER_I_KNOW_THIS_IS_UNSTABLE

#include <e-util/e-util.h>

#include "e-source-weather.h"

#if HAVE_NL_LANGINFO
#include <langinfo.h>
#endif

typedef ESourceConfigBackend ECalConfigWeather;
typedef ESourceConfigBackendClass ECalConfigWeatherClass;

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

typedef struct _Context Context;

struct _Context {
    GtkWidget *location_entry;
};

/* Forward Declarations */
GType e_cal_config_weather_get_type (void);

G_DEFINE_DYNAMIC_TYPE (
    ECalConfigWeather,
    e_cal_config_weather,
    E_TYPE_SOURCE_CONFIG_BACKEND)

static void
cal_config_weather_context_free (Context *context)
{
    g_object_unref (context->location_entry);

    g_slice_free (Context, context);
}

static gboolean
cal_config_weather_location_to_string (GBinding *binding,
                                       const GValue *source_value,
                                       GValue *target_value,
                                       gpointer user_data)
{
    GWeatherLocation *location;
    gchar *string = NULL;

    location = g_value_get_boxed (source_value);

    while (location && !gweather_location_has_coords (location)) {
        location = gweather_location_get_parent (location);
    }

    if (location) {
        gdouble latitude, longitude;
        gchar lat_str[G_ASCII_DTOSTR_BUF_SIZE + 1];
        gchar lon_str[G_ASCII_DTOSTR_BUF_SIZE + 1];

        gweather_location_get_coords (location, &latitude, &longitude);

        g_ascii_dtostr (lat_str, G_ASCII_DTOSTR_BUF_SIZE, latitude);
        g_ascii_dtostr (lon_str, G_ASCII_DTOSTR_BUF_SIZE, longitude);

        string = g_strdup_printf ("%s/%s", lat_str, lon_str);
    }

    g_value_take_string (target_value, string);

    return TRUE;
}

static GWeatherLocation *
cal_config_weather_find_location_by_coords (GWeatherLocation *start,
                                            gdouble latitude,
                                            gdouble longitude)
{
    GWeatherLocation *location, **children;
    gint ii;

    if (start == NULL)
        return NULL;

    location = start;
    if (gweather_location_has_coords (location)) {
        gdouble lat, lon;

        gweather_location_get_coords (location, &lat, &lon);

        if (lat == latitude && lon == longitude)
            return location;
    }

    children = gweather_location_get_children (location);
    for (ii = 0; children[ii]; ii++) {
        location = cal_config_weather_find_location_by_coords (
            children[ii], latitude, longitude);
        if (location != NULL)
            return location;
    }

    return NULL;
}

static gboolean
cal_config_weather_string_to_location (GBinding *binding,
                                       const GValue *source_value,
                                       GValue *target_value,
                                       gpointer user_data)
{
    GWeatherLocation *world, *match;
    const gchar *string;
    gchar **tokens;
    gdouble latitude, longitude;

    world = user_data;

    string = g_value_get_string (source_value);

    if (string == NULL)
        return FALSE;

    /* String is: latitude '/' longitude */
    tokens = g_strsplit (string, "/", 2);

    if (g_strv_length (tokens) != 2) {
        g_strfreev (tokens);
        return FALSE;
    }

    latitude = g_ascii_strtod (tokens[0], NULL);
    longitude = g_ascii_strtod (tokens[1], NULL);

    match = cal_config_weather_find_location_by_coords (
        world, latitude, longitude);

    g_value_set_boxed (target_value, match);

    g_strfreev (tokens);

    return match != NULL;
}

static gboolean
is_locale_metric (void)
{
    const gchar *fmt;

#if HAVE_NL_LANGINFO && HAVE__NL_MEASUREMENT_MEASUREMENT
    fmt = nl_langinfo (_NL_MEASUREMENT_MEASUREMENT);

    if (fmt && *fmt == 2)
        return FALSE;
    else
        return TRUE;
#else
    /* Translators: Please indicate whether your locale uses the
     * metric or imperial measurement system by changing this to
     * either "default:mm" or "default:inch", respectively.
     *
     * This string is just a fallback mechanism for systems on
     * which _NL_MEASUREMENT_MEASUREMENT is not available. */
    fmt = C_("locale-metric", "default:mm");

    return g_strcmp0 (fmt, "default:inch") != 0;
#endif
}

static ESourceWeatherUnits
cal_config_weather_get_units_from_locale (void)
{
    return is_locale_metric () ?
        E_SOURCE_WEATHER_UNITS_CENTIGRADE :
        E_SOURCE_WEATHER_UNITS_FAHRENHEIT;
}

static gboolean
cal_config_weather_allow_creation (ESourceConfigBackend *backend)
{
    ESourceConfig *config;
    ECalSourceConfig *cal_config;
    ECalClientSourceType source_type;

    /* No such thing as weather task lists or weather memo lists. */

    config = e_source_config_backend_get_config (backend);

    cal_config = E_CAL_SOURCE_CONFIG (config);
    source_type = e_cal_source_config_get_source_type (cal_config);

    return (source_type == E_CAL_CLIENT_SOURCE_TYPE_EVENTS);
}

static void
cal_config_weather_insert_widgets (ESourceConfigBackend *backend,
                                   ESource *scratch_source)
{
    ESourceConfig *config;
    ESourceExtension *extension;
    GWeatherLocation *world;
    GtkWidget *widget;
    Context *context;
    const gchar *extension_name;
    const gchar *uid;
    gboolean is_new_source;

    is_new_source = !e_source_has_extension (
        scratch_source, E_SOURCE_EXTENSION_WEATHER_BACKEND);

    context = g_slice_new (Context);
    uid = e_source_get_uid (scratch_source);
    config = e_source_config_backend_get_config (backend);

    g_object_set_data_full (
        G_OBJECT (backend), uid, context,
        (GDestroyNotify) cal_config_weather_context_free);

    world = gweather_location_new_world (TRUE);

    e_cal_source_config_add_offline_toggle (
        E_CAL_SOURCE_CONFIG (config), scratch_source);

    widget = gweather_location_entry_new (world);
    e_source_config_insert_widget (
        config, scratch_source, _("Location:"), widget);
    context->location_entry = g_object_ref (widget);
    gtk_widget_show (widget);

    widget = gtk_combo_box_text_new ();
    /* keep the same order as in the ESourceWeatherUnits */
    gtk_combo_box_text_append_text (
        GTK_COMBO_BOX_TEXT (widget),
        /* Translators: This is the temperature in degrees
         * Fahrenheit. (\302\260 is U+00B0 DEGREE SIGN) */
        _("Fahrenheit (\302\260F)"));
    gtk_combo_box_text_append_text (
        GTK_COMBO_BOX_TEXT (widget),
        /* Translators: This is the temperature in degrees
         * Celsius. (\302\260 is U+00B0 DEGREE SIGN) */
        _("Centigrade (\302\260C)"));
    gtk_combo_box_text_append_text (
        GTK_COMBO_BOX_TEXT (widget),
        /* Translators: This is the temperature in kelvin. */
        _("Kelvin (K)"));
    e_source_config_insert_widget (
        config, scratch_source, _("Units:"), widget);
    gtk_widget_show (widget);

    e_source_config_add_refresh_interval (config, scratch_source);

    extension_name = E_SOURCE_EXTENSION_WEATHER_BACKEND;
    extension = e_source_get_extension (scratch_source, extension_name);

    if (is_new_source)
        e_source_weather_set_units (
            E_SOURCE_WEATHER (extension),
            cal_config_weather_get_units_from_locale ());

    g_object_bind_property_full (
        extension, "location",
        context->location_entry, "location",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE,
        cal_config_weather_string_to_location,
        cal_config_weather_location_to_string,
        gweather_location_ref (world),
        (GDestroyNotify) gweather_location_unref);

    g_object_bind_property (
        extension, "units",
        widget, "active",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE);

    gweather_location_unref (world);
}

static gboolean
cal_config_weather_check_complete (ESourceConfigBackend *backend,
                                   ESource *scratch_source)
{
    ESourceWeather *extension;
    const gchar *extension_name;
    const gchar *location;

    extension_name = E_SOURCE_EXTENSION_WEATHER_BACKEND;
    extension = e_source_get_extension (scratch_source, extension_name);

    location = e_source_weather_get_location (extension);

    g_debug ("Location: [%s]", location);

    return (location != NULL) && (*location != '\0');
}

static void
e_cal_config_weather_class_init (ESourceConfigBackendClass *class)
{
    EExtensionClass *extension_class;

    extension_class = E_EXTENSION_CLASS (class);
    extension_class->extensible_type = E_TYPE_CAL_SOURCE_CONFIG;

    class->parent_uid = "weather-stub";
    class->backend_name = "weather";
    class->allow_creation = cal_config_weather_allow_creation;
    class->insert_widgets = cal_config_weather_insert_widgets;
    class->check_complete = cal_config_weather_check_complete;
}

static void
e_cal_config_weather_class_finalize (ESourceConfigBackendClass *class)
{
}

static void
e_cal_config_weather_init (ESourceConfigBackend *backend)
{
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
    e_source_weather_type_register (type_module);
    e_cal_config_weather_register_type (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}