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[libgweather] GWeatherInfo: fix accessors for astronomical data

commit 3cb64a2e1285734214fea76cb999d11ffee4c49e
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sun Dec 2 19:40:11 2012 +0100

    GWeatherInfo: fix accessors for astronomical data
    
    Introduce two new functions, ensure_sun() and ensure_moon(), that will
    try to compute the sun and moon data if not previously done, using a
    new field, current_time, that stores the wall clock time when constructed
    for master GWeatherInfos, and the update time for slaves (forecast).

 libgweather/test_sun_moon.c |   10 +++---
 libgweather/weather-iwin.c  |    3 +-
 libgweather/weather-moon.c  |   68 +++++++++++++++++++++++++++----------------
 libgweather/weather-priv.h  |   16 +++-------
 libgweather/weather-sun.c   |   56 ++++++++++++-----------------------
 libgweather/weather-yahoo.c |    5 +--
 libgweather/weather-yrno.c  |   10 +-----
 libgweather/weather.c       |   58 +++++++++++--------------------------
 8 files changed, 93 insertions(+), 133 deletions(-)
---
diff --git a/libgweather/test_sun_moon.c b/libgweather/test_sun_moon.c
index 2f03f67..de6a7b9 100644
--- a/libgweather/test_sun_moon.c
+++ b/libgweather/test_sun_moon.c
@@ -59,18 +59,18 @@ main (int argc, char **argv)
 	//	printf(" gtime=%s\n", gtime);
 	g_date_set_parse(&gdate, gtime);
 	g_date_to_struct_tm(&gdate, &tm);
-	info->priv->update = mktime(&tm);
+	priv->current_time = mktime(&tm);
     } else {
-	info->priv->update = time(NULL);
+	priv->current_time = time(NULL);
     }
 
-    calc_sun_time(info, info->priv->update);
-    bmoon = calc_moon(info);
+    _gweather_info_ensure_sun (info);
+    _gweather_info_ensure_moon (info);
 
     printf ("  Latitude %7.3f %c  Longitude %7.3f %c for %s  All times UTC\n",
 	    fabs(latitude), (latitude >= 0. ? 'N' : 'S'),
 	    fabs(longitude), (longitude >= 0. ? 'E' : 'W'),
-	    asctime(gmtime(&info->priv->update)));
+	    asctime(gmtime(&priv->current_time)));
     printf("sunrise:   %s",
 	   (info->priv->sunriseValid ? ctime(&info->priv->sunrise) : "(invalid)\n"));
     printf("sunset:    %s",
diff --git a/libgweather/weather-iwin.c b/libgweather/weather-iwin.c
index 20add27..3c27a67 100644
--- a/libgweather/weather-iwin.c
+++ b/libgweather/weather-iwin.c
@@ -176,8 +176,7 @@ parseForecastXml (const char *buff, GWeatherInfo *master_info)
 
                         for (i = 0; i < 7;  i++) {
                             GWeatherInfo *nfo = _gweather_info_new_clone (master_info);
-			    nfo->priv->update = update_times[i];
-			    calc_sun_time (nfo, nfo->priv->update);
+			    nfo->priv->current_time = nfo->priv->update = update_times[i];
 
                             if (nfo)
                                 res = g_slist_append (res, nfo);
diff --git a/libgweather/weather-moon.c b/libgweather/weather-moon.c
index db3ff8a..222eef4 100644
--- a/libgweather/weather-moon.c
+++ b/libgweather/weather-moon.c
@@ -50,6 +50,16 @@
 #define LUNAR_PROGRESSION	13.176358
 #define LUNAR_INCLINATION	DEGREES_TO_RADIANS(5.145396)
 
+/*
+ * calc_moon_internal:
+ * @info:  WeatherInfo containing time_t of interest.  The
+ *    values moonphase, moonlatitude and moonValid are updated
+ *    on success.
+ *
+ * Returns: gboolean indicating success or failure.
+ *    moonphase is expressed as degrees where '0' is a new moon,
+ *    '90' is first quarter, etc.
+ */
 static gboolean
 calc_moon_internal (time_t update, gdouble *moonphase, gdouble *moonlatitude)
 {
@@ -125,28 +135,20 @@ calc_moon_internal (time_t update, gdouble *moonphase, gdouble *moonlatitude)
     return TRUE;
 }
 
-/**
- * calc_moon:
- * @info:  WeatherInfo containing time_t of interest.  The
- *    values moonphase, moonlatitude and moonValid are updated
- *    on success.
- *
- * Returns: gboolean indicating success or failure.
- *    moonphase is expressed as degrees where '0' is a new moon,
- *    '90' is first quarter, etc.
- */
-
-gboolean
-calc_moon (GWeatherInfo *info)
+void
+_gweather_info_ensure_moon (GWeatherInfo *info)
 {
-    GWeatherInfoPrivate *priv = info->priv;
-    return priv->moonValid = calc_moon_internal (priv->update,
-						 &priv->moonphase,
-						 &priv->moonlatitude);
-}
+    GWeatherInfoPrivate *priv;
 
+    priv = info->priv;
 
-/**
+    if (!priv->moonValid)
+	priv->moonValid = calc_moon_internal (priv->current_time,
+					      &priv->moonphase,
+					      &priv->moonlatitude);
+}
+
+/*
  * calc_moon_phases:
  * @info:   WeatherInfo containing the time_t of interest
  * @phases: An array of four time_t values that will hold the returned values.
@@ -155,8 +157,7 @@ calc_moon (GWeatherInfo *info)
  *
  * Returns: gboolean indicating success or failure
  */
-
-gboolean
+static gboolean
 calc_moon_phases (GWeatherInfo *info, time_t *phases)
 {
     GWeatherInfoPrivate *priv;
@@ -169,15 +170,13 @@ calc_moon_phases (GWeatherInfo *info, time_t *phases)
     int         iter;
     time_t      dtime;
 
-    g_return_val_if_fail (info != NULL &&
-			  (info->priv->moonValid || calc_moon (info)),
-			  FALSE);
+    _gweather_info_ensure_moon (info);
 
     priv = info->priv;
     ptime = phases;
 
     for (idx = 0; idx < 4; idx++) {
-	tmp_update = priv->update;
+	tmp_update = priv->current_time;
 	tmp_moonphase = priv->moonphase;
 
 	/*
@@ -207,3 +206,22 @@ calc_moon_phases (GWeatherInfo *info, time_t *phases)
 
     return TRUE;
 }
+
+/**
+ * gweather_info_get_upcoming_moonphases:
+ * @info: a #GWeatherInfo containing the time_t of interest
+ * @phases: (out) (array fixed-size=4) (element-type gulong): An array of four
+ *    time_t values that will hold the returned values.
+ *    The values are estimates of the time of the next new, quarter, full and
+ *    three-quarter moons.
+ *
+ * Returns: gboolean indicating success or failure
+ */
+gboolean
+gweather_info_get_upcoming_moonphases (GWeatherInfo *info, time_t *phases)
+{
+    g_return_val_if_fail (GWEATHER_IS_INFO (info), FALSE);
+    g_return_val_if_fail (phases != NULL, FALSE);
+
+    return calc_moon_phases(info, phases);
+}
diff --git a/libgweather/weather-priv.h b/libgweather/weather-priv.h
index 985114c..84d94ce 100644
--- a/libgweather/weather-priv.h
+++ b/libgweather/weather-priv.h
@@ -119,6 +119,7 @@ struct _GWeatherInfoPrivate {
     GWeatherLocation *world;
     GWeatherLocation *glocation;
     GWeatherUpdate update;
+    GWeatherUpdate current_time;
     GWeatherSky sky;
     GWeatherConditions cond;
     GWeatherTemperature temp;
@@ -209,20 +210,13 @@ void		ecl2equ			(gdouble t,
 					 gdouble *ra,
 					 gdouble *decl);
 gdouble		sunEclipLongitude	(time_t t);
-gboolean	calc_sun		(GWeatherInfo *info);
-gboolean	calc_sun_time		(GWeatherInfo *info, time_t t);
-gboolean	calc_moon		(GWeatherInfo *info);
-gboolean	calc_moon_phases	(GWeatherInfo *info, time_t *phases);
 
-void		free_forecast_list	(GWeatherInfo *info);
+void            _gweather_info_ensure_sun  (GWeatherInfo *info);
+void            _gweather_info_ensure_moon (GWeatherInfo *info);
 
-GWeatherInfo   *_gweather_info_new_clone (GWeatherInfo *info);
+void		free_forecast_list	  (GWeatherInfo *info);
 
-GWeatherLocation *_gweather_location_new_detached (GWeatherLocation *nearest_station,
-						   const char       *name,
-						   gboolean          latlon_valid,
-						   gdouble           latitude,
-						   gdouble           longitude);
+GWeatherInfo   *_gweather_info_new_clone  (GWeatherInfo *info);
 
 #endif /* __WEATHER_PRIV_H_ */
 
diff --git a/libgweather/weather-sun.c b/libgweather/weather-sun.c
index 781345d..7874fbe 100644
--- a/libgweather/weather-sun.c
+++ b/libgweather/weather-sun.c
@@ -159,11 +159,11 @@ t0 (time_t date)
 
 
 static gboolean
-calc_sun2 (GWeatherInfo *info, time_t t)
+calc_sun (GWeatherInfo *info, time_t t)
 {
-    GWeatherInfoPrivate *priv = info->priv;
-    gdouble obsLat = priv->location->latitude;
-    gdouble obsLon = priv->location->longitude;
+    GWeatherInfoPrivate *priv;
+    gdouble obsLat;
+    gdouble obsLon;
     time_t gm_midn;
     time_t lcl_midn;
     gdouble gm_hoff, lambda;
@@ -176,8 +176,9 @@ calc_sun2 (GWeatherInfo *info, time_t t)
     gdouble x, u, dt;
 
     /* Approximate preceding local midnight at observer's longitude */
-    obsLat = priv->location->latitude;
-    obsLon = priv->location->longitude;
+    priv = info->priv;
+    obsLat = priv->location.latitude;
+    obsLon = priv->location.longitude;
     gm_midn = t - (t % 86400);
     gm_hoff = floor ((RADIANS_TO_DEGREES (obsLon) + 7.5) / 15.);
     lcl_midn = gm_midn - 3600. * gm_hoff;
@@ -187,7 +188,7 @@ calc_sun2 (GWeatherInfo *info, time_t t)
         lcl_midn -= 86400;
 
     lambda = sunEclipLongitude (lcl_midn);
-    
+
     /*
      * Calculate equitorial coordinates of sun at previous
      * and next local midnights
@@ -196,7 +197,7 @@ calc_sun2 (GWeatherInfo *info, time_t t)
     ecl2equ (lcl_midn + 86400.,
 	     lambda + DEGREES_TO_RADIANS(SOL_PROGRESSION), 0.,
 	     &ra2, &decl2);
-    
+
     /*
      * If the observer is within the Arctic or Antarctic Circles then
      * the sun may be above or below the horizon for the full day.
@@ -246,7 +247,7 @@ calc_sun2 (GWeatherInfo *info, time_t t)
         set1  += 24.;
         set2  += 24.;
     }
-   
+
     /*
      * Interpolate between the two to get a rise and set time
      * based on the sun's position at local noon (step 8)
@@ -262,7 +263,7 @@ calc_sun2 (GWeatherInfo *info, time_t t)
     x = DEGREES_TO_RADIANS(0.830725);
     u = acos ( sin(obsLat) / cos(decl2) );
     dt = RADIANS_TO_HOURS ( asin ( sin(x) / sin(u) ) / cos(decl2) );
-   
+
     /*
      * Subtract the correction value from sunrise and add to sunset,
      * then (step 11) convert sideral times to UT
@@ -286,34 +287,16 @@ calc_sun2 (GWeatherInfo *info, time_t t)
     return (priv->sunriseValid || priv->sunsetValid);
 }
 
-
-/**
- * calc_sun_time:
- * @info: #WeatherInfo structure containing the observer's latitude
- * and longitude in radians, fills in the sunrise and sunset times.
- * @t: time_t
- *
- * Returns: gboolean indicating if the results are valid.
- */
-gboolean
-calc_sun_time (GWeatherInfo *info, time_t t)
+void
+_gweather_info_ensure_sun (GWeatherInfo *info)
 {
-    return info->priv->location->latlon_valid && calc_sun2 (info, t);
-}
+    GWeatherInfoPrivate *priv;
 
-/**
- * calc_sun:
- * @info: #WeatherInfo structure containing the observer's latitude
- * and longitude in radians, fills in the sunrise and sunset times.
- *
- * Returns: gboolean indicating if the results are valid.
- */
-gboolean
-calc_sun (GWeatherInfo *info)
-{
-    return calc_sun_time(info, time(NULL));
-}
+    priv = info->priv;
 
+    if (!priv->sunriseValid && !priv->sunsetValid)
+	calc_sun (info, priv->current_time);
+}
 
 /**
  * weather_info_next_sun_event:
@@ -336,8 +319,7 @@ gweather_info_next_sun_event (GWeatherInfo *info)
 
     g_return_val_if_fail (info != NULL, -1);
 
-    if (!calc_sun (info))
-	return -1;
+    _gweather_info_ensure_sun (info);
 
     /* Determine when the next local midnight occurs */
     (void) localtime_r (&now, &ltm);
diff --git a/libgweather/weather-yahoo.c b/libgweather/weather-yahoo.c
index 5bb864b..bd937b6 100644
--- a/libgweather/weather-yahoo.c
+++ b/libgweather/weather-yahoo.c
@@ -174,7 +174,7 @@ make_info_from_node (GWeatherInfo *master_info,
     priv = info->priv;
 
     val = xmlGetProp (node, XC("date"));
-    priv->update = date_to_time_t (val);
+    priv->current_time = priv->update = date_to_time_t (val);
     xmlFree (val);
 
     val = xmlGetProp (node, XC("high"));
@@ -201,9 +201,6 @@ make_info_from_node (GWeatherInfo *master_info,
 	priv->valid = FALSE;
     xmlFree (val);
 
-    /* Calculate sun to get the right icon */
-    calc_sun_time (info, info->priv->update);
-
     return info;
 }
 
diff --git a/libgweather/weather-yrno.c b/libgweather/weather-yrno.c
index 9b58f0a..b5a2f79 100644
--- a/libgweather/weather-yrno.c
+++ b/libgweather/weather-yrno.c
@@ -246,14 +246,11 @@ make_info_from_node_old (GWeatherInfo *master_info,
     priv = info->priv;
 
     val = xmlGetProp (node, XC("from"));
-    priv->update = date_to_time_t (val, info->priv->location->tz_hint);
+    priv->current_time = priv->update = date_to_time_t (val, info->priv->location.tz_hint);
     xmlFree (val);
 
     fill_info_from_node (info, node);
 
-    /* Calculate sun to get the right icon */
-    calc_sun_time (info, info->priv->update);
-
     return info;
 }
 
@@ -385,7 +382,7 @@ parse_forecast_xml_new (GWeatherInfo    *master_info,
 	*/
 	if (from_time == to_time) {
 	    info = _gweather_info_new_clone (master_info);
-	    info->priv->update = from_time;
+	    info->priv->current_time = info->priv->update = from_time;
 
 	    for (location = node->children;
 		 location && location->type != XML_ELEMENT_NODE;
@@ -404,9 +401,6 @@ parse_forecast_xml_new (GWeatherInfo    *master_info,
 		    fill_info_from_node (info, location);
 	    }
 
-	    /* Calculate sun to get the right icon */
-	    calc_sun_time (info, info->priv->update);
-
 	    priv->forecast_list = g_slist_append (priv->forecast_list, info);
 	}
     }
diff --git a/libgweather/weather.c b/libgweather/weather.c
index 4952106..7a087f8 100644
--- a/libgweather/weather.c
+++ b/libgweather/weather.c
@@ -464,6 +464,7 @@ gweather_info_reset (GWeatherInfo *info)
     }
 
     priv->update = 0;
+    priv->current_time = time(NULL);
     priv->sky = -1;
     priv->cond.significant = FALSE;
     priv->cond.phenomenon = GWEATHER_PHENOMENON_NONE;
@@ -958,15 +959,12 @@ gweather_info_get_sunrise (GWeatherInfo *info)
     gchar *buf;
 
     g_return_val_if_fail (GWEATHER_IS_INFO (info), NULL);
-    g_return_val_if_fail (info->priv->location, NULL);
 
     priv = info->priv;
 
-    if (!priv->location->latlon_valid)
-        return g_strdup ("-");
-    if (!priv->valid)
-        return g_strdup ("-");
-    if (!calc_sun (info))
+    _gweather_info_ensure_sun (info);
+
+    if (!priv->valid || !priv->sunriseValid)
         return g_strdup ("-");
 
     sunrise = g_date_time_new_from_unix_local (priv->sunrise);
@@ -987,15 +985,12 @@ gweather_info_get_sunset (GWeatherInfo *info)
     gchar *buf;
 
     g_return_val_if_fail (GWEATHER_IS_INFO (info), NULL);
-    g_return_val_if_fail (info->priv->location, NULL);
 
     priv = info->priv;
 
-    if (!priv->location->latlon_valid)
-        return g_strdup ("-");
-    if (!priv->valid)
-        return g_strdup ("-");
-    if (!calc_sun (info))
+    _gweather_info_ensure_sun (info);
+
+    if (!priv->valid || !priv->sunsetValid)
         return g_strdup ("-");
 
     sunset = g_date_time_new_from_unix_local (priv->sunset);
@@ -1134,6 +1129,9 @@ gweather_info_get_icon_name (GWeatherInfo *info)
     if (!priv->valid)
         return NULL;
 
+    _gweather_info_ensure_sun (info);
+    _gweather_info_ensure_moon (info);
+
     cond = priv->cond;
     sky = priv->sky;
 
@@ -1187,7 +1185,7 @@ gweather_info_get_icon_name (GWeatherInfo *info)
     else if (priv->polarNight)
 	daytime = FALSE;
     else {
-	current_time = priv->update;
+	current_time = priv->current_time;
 	daytime =
 	    ( !priv->sunriseValid || (current_time >= priv->sunrise) ) &&
 	    ( !priv->sunsetValid || (current_time < priv->sunset) );
@@ -1617,6 +1615,8 @@ gweather_info_get_value_sunrise (GWeatherInfo *info, time_t *value)
     g_return_val_if_fail (GWEATHER_IS_INFO (info), FALSE);
     g_return_val_if_fail (value != NULL, FALSE);
 
+    _gweather_info_ensure_sun (info);
+
     if (!info->priv->valid || !info->priv->sunriseValid)
 	return FALSE;
 
@@ -1638,6 +1638,8 @@ gweather_info_get_value_sunset (GWeatherInfo *info, time_t *value)
     g_return_val_if_fail (GWEATHER_IS_INFO (info), FALSE);
     g_return_val_if_fail (value != NULL, FALSE);
 
+    _gweather_info_ensure_sun (info);
+
     if (!info->priv->valid || !info->priv->sunsetValid)
 	return FALSE;
 
@@ -1663,6 +1665,8 @@ gweather_info_get_value_moonphase (GWeatherInfo      *info,
     g_return_val_if_fail (value != NULL, FALSE);
     g_return_val_if_fail (lat != NULL, FALSE);
 
+    _gweather_info_ensure_moon (info);
+
     if (!info->priv->valid || !info->priv->moonValid)
 	return FALSE;
 
@@ -1752,34 +1756,6 @@ gweather_info_get_value_visibility (GWeatherInfo *info,
     return distance_value (info->priv->visibility, unit, value, info->priv->settings);
 }
 
-/**
- * weather_info_get_upcoming_moonphases:
- * @info: a #GWeatherInfo containing the time_t of interest
- * @phases: (out) (array fixed-size=4) (element-type gulong): An array of four
- *    time_t values that will hold the returned values.
- *    The values are estimates of the time of the next new, quarter, full and
- *    three-quarter moons.
- *
- * Returns: gboolean indicating success or failure
- */
-gboolean
-gweather_info_get_upcoming_moonphases (GWeatherInfo *info, time_t *phases)
-{
-    g_return_val_if_fail (GWEATHER_IS_INFO (info), FALSE);
-    g_return_val_if_fail (phases != NULL, FALSE);
-
-    return calc_moon_phases(info, phases);
-}
-
-static void
-_weather_internal_check (void)
-{
-    g_assert (G_N_ELEMENTS (wind_direction_str) == GWEATHER_WIND_LAST);
-    g_assert (G_N_ELEMENTS (sky_str) == GWEATHER_SKY_LAST);
-    g_assert (G_N_ELEMENTS (conditions_str) == GWEATHER_PHENOMENON_LAST);
-    g_assert (G_N_ELEMENTS (conditions_str[0]) == GWEATHER_QUALIFIER_LAST);
-}
-
 static void
 gweather_info_set_location_internal (GWeatherInfo     *info,
 				     GWeatherLocation *location)
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