weather: fix UV index display and add WeatherFlow precipitation (#4108)

While looking at the WeatherFlow provider (to evaluate #4107), I noticed
a few things that weren't quite right.

1. **UV index was broken for most providers in forecast/hourly views.**
The templates read `uv_index`, but only the WeatherAPI provider actually
wrote that key. All other providers (OpenWeatherMap, WeatherFlow,
PirateWeather, etc.) use `uvIndex` - so UV was silently never displayed
for them. This went unnoticed because `showUVIndex` defaults to `false`
and there were no test assertions for it. Standardized everything on
`uvIndex` and added test coverage.

2. **WeatherFlow didn't map precipitation for current weather.** The API
provides `precip_accum_local_day` and `precip_probability`, but they
weren't passed through. While adding them I also noticed the template
used truthiness checks, which hid valid zero values. Fixed both.

3. **`||` vs `??` in WeatherFlow provider.** Several numeric fields used
`|| null`, replacing valid `0` with `null`. Switched to `??` for
correctness.

defaultmodules/weather/current.njk

@@ -38,7 +38,7 @@
       {% if config.showUVIndex %}
         <td class="align-right bright uv-index">
           <div class="wi dimmed wi-hot"></div>
-          {{ current.uv_index }}
+          {{ current.uvIndex }}
         </td>
       {% endif %}
     </div>
@@ -78,11 +78,11 @@
         </span>
         <br />
       {% endif %}
-      {% if config.showPrecipitationAmount and current.precipitationAmount %}
+      {% if config.showPrecipitationAmount and current.precipitationAmount is defined and current.precipitationAmount is not none %}
         <span class="dimmed"> <span class="precipitationLeadText">{{ "PRECIP_AMOUNT" | translate }}</span> {{ current.precipitationAmount | unit("precip", current.precipitationUnits) }} </span>
         <br />
       {% endif %}
-      {% if config.showPrecipitationProbability and current.precipitationProbability %}
+      {% if config.showPrecipitationProbability and current.precipitationProbability is defined and current.precipitationProbability is not none %}
         <span class="dimmed"> <span class="precipitationLeadText">{{ "PRECIP_POP" | translate }}</span> {{ current.precipitationProbability }}% </span>
       {% endif %}
     </div>

defaultmodules/weather/forecast.njk

@@ -31,7 +31,7 @@
         {% endif %}
         {% if config.showUVIndex %}
           <td class="align-right dimmed uv-index">
-            {{ f.uv_index }}
+            {{ f.uvIndex }}
             <span class="wi dimmed weathericon wi-hot"></span>
           </td>
         {% endif %}

defaultmodules/weather/hourly.njk

@@ -15,8 +15,8 @@
         <td class="align-right bright">{{ hour.temperature | roundValue | unit("temperature") }}</td>
         {% if config.showUVIndex %}
           <td class="align-right bright uv-index">
-            {% if hour.uv_index!=0 %}
-              {{ hour.uv_index }}
+            {% if hour.uvIndex!=0 %}
+              {{ hour.uvIndex }}
               <span class="wi weathericon wi-hot"></span>
             {% endif %}
           </td>

defaultmodules/weather/providers/weatherapi.js

@@ -351,7 +351,7 @@ class WeatherAPIProvider {
 				weather.precipitationProbability = precipitationProbability;
 			}
 
-			weather.uv_index = this.#toNumber(forecastDay.day?.uv);
+			weather.uvIndex = this.#toNumber(forecastDay.day?.uv);
 
 			days.push(weather);
 
@@ -410,7 +410,7 @@ class WeatherAPIProvider {
 				const willSnow = this.#toNumber(hourData.will_it_snow) ?? 0;
 				weather.precipitationProbability = (willRain + willSnow) * 50;
 
-				weather.uv_index = this.#toNumber(hourData.uv);
+				weather.uvIndex = this.#toNumber(hourData.uv);
 
 				hours.push(weather);
 

defaultmodules/weather/providers/weatherflow.js

@@ -145,12 +145,15 @@ class WeatherFlowProvider {
 
 		const weather = {
 			date: new Date(),
-			humidity: current.relative_humidity || null,
-			temperature: current.air_temperature || null,
-			feelsLikeTemp: current.feels_like || null,
+			humidity: current.relative_humidity ?? null,
+			temperature: current.air_temperature ?? null,
+			feelsLikeTemp: current.feels_like ?? null,
 			windSpeed: current.wind_avg != null ? convertKmhToMs(current.wind_avg) : null,
-			windFromDirection: current.wind_direction || null,
+			windFromDirection: current.wind_direction ?? null,
 			weatherType: this.#convertWeatherType(current.icon),
+			precipitationAmount: current.precip_accum_local_day ?? null,
+			precipitationUnits: "mm",
+			precipitationProbability: current.precip_probability ?? null,
 			uvIndex: current.uv || null,
 			sunrise: daily.sunrise ? new Date(daily.sunrise * 1000) : null,
 			sunset: daily.sunset ? new Date(daily.sunset * 1000) : null
@@ -175,9 +178,9 @@ class WeatherFlowProvider {
 		for (const forecast of data.forecast.daily) {
 			const weather = {
 				date: new Date(forecast.day_start_local * 1000),
-				minTemperature: forecast.air_temp_low || null,
-				maxTemperature: forecast.air_temp_high || null,
-				precipitationProbability: forecast.precip_probability || null,
+				minTemperature: forecast.air_temp_low ?? null,
+				maxTemperature: forecast.air_temp_high ?? null,
+				precipitationProbability: forecast.precip_probability ?? null,
 				weatherType: this.#convertWeatherType(forecast.icon),
 				precipitationAmount: 0.0,
 				precipitationUnits: "mm",
@@ -193,8 +196,8 @@ class WeatherFlowProvider {
 				if (hourDate.getFullYear() === forecastDate.getFullYear()
 				  && hourDate.getMonth() === forecastDate.getMonth()
 				  && hourDate.getDate() === forecastDate.getDate()) {
-					weather.uvIndex = Math.max(weather.uvIndex, hour.uv || 0);
-					weather.precipitationAmount += hour.precip || 0;
+					weather.uvIndex = Math.max(weather.uvIndex, hour.uv ?? 0);
+					weather.precipitationAmount += hour.precip ?? 0;
 				} else if (hourDate > forecastDate) {
 					// Check if we've moved to the next day
 					const diffMs = hourDate - forecastDate;
@@ -224,14 +227,14 @@ class WeatherFlowProvider {
 		for (const hour of data.forecast.hourly) {
 			const weather = {
 				date: new Date(hour.time * 1000),
-				temperature: hour.air_temperature || null,
-				feelsLikeTemp: hour.feels_like || null,
-				humidity: hour.relative_humidity || null,
+				temperature: hour.air_temperature ?? null,
+				feelsLikeTemp: hour.feels_like ?? null,
+				humidity: hour.relative_humidity ?? null,
 				windSpeed: hour.wind_avg != null ? convertKmhToMs(hour.wind_avg) : null,
-				windFromDirection: hour.wind_direction || null,
+				windFromDirection: hour.wind_direction ?? null,
 				weatherType: this.#convertWeatherType(hour.icon),
-				precipitationProbability: hour.precip_probability || null,
-				precipitationAmount: hour.precip || 0,
+				precipitationProbability: hour.precip_probability ?? null,
+				precipitationAmount: hour.precip ?? 0,
 				precipitationUnits: "mm",
 				uvIndex: hour.uv || null
 			};

tests/unit/modules/default/weather/providers/weatherapi_spec.js

@@ -240,6 +240,7 @@ describe("WeatherAPIProvider", () => {
 			expect(result[0].minTemperature).toBe(-8);
 			expect(result[0].maxTemperature).toBe(-1);
 			expect(result[0].weatherType).toBe("day-sprinkle");
+			expect(result[0].uvIndex).toBe(1);
 			expect(result[0].sunrise).toBeInstanceOf(Date);
 			expect(result[0].sunset).toBeInstanceOf(Date);
 		});
@@ -275,6 +276,7 @@ describe("WeatherAPIProvider", () => {
 			expect(result[0].humidity).toBe(85);
 			expect(result[0].windFromDirection).toBe(210);
 			expect(result[0].weatherType).toBe("night-sprinkle");
+			expect(result[0].uvIndex).toBe(0);
 			expect(result[0].precipitationProbability).toBe(50);
 		});
 	});

tests/unit/modules/default/weather/providers/weatherflow_spec.js

@@ -85,6 +85,9 @@ describe("WeatherFlowProvider", () => {
 			expect(result).toBeDefined();
 			expect(result.temperature).toBe(16);
 			expect(result.humidity).toBe(28);
+			expect(result.precipitationAmount).toBe(0);
+			expect(result.precipitationUnits).toBe("mm");
+			expect(result.precipitationProbability).toBe(0);
 			expect(result.weatherType).not.toBeNull();
 		});