feat: add weather unit preferences

tests/weather-brief.test.ts

@@ -54,10 +54,16 @@ function warning(overrides: Partial<WeatherWarning> = {}): WeatherWarning {
 }
 
 describe("weather briefs", () => {
-  it("uses selected temperature and wind units in the morning brief", () => {
+  it("uses selected temperature, wind and precipitation units in the morning brief", () => {
     const brief = buildWeatherBrief({
       forecast: forecast([
-        hour({ time: "2026-06-14T08:00", temperature: 10, windSpeed: 4, precipitationProbability: 80 }),
+        hour({
+          time: "2026-06-14T08:00",
+          temperature: 10,
+          windSpeed: 4,
+          precipitationProbability: 80,
+          precipitation: 25.4,
+        }),
         hour({ time: "2026-06-14T09:00", temperature: 12, windSpeed: 5, precipitationProbability: 30 }),
       ]),
       warnings: [],
@@ -67,6 +73,7 @@ describe("weather briefs", () => {
       language: "en",
       temperatureUnit: "f",
       windSpeedUnit: "mph",
+      precipitationUnit: "in",
       now: new Date("2026-06-14T06:00:00.000Z"),
     });
 
@@ -74,25 +81,34 @@ describe("weather briefs", () => {
     expect(brief?.pushBody).toContain("50°F-54°F");
     expect(brief?.pushBody).toContain("wind 11 mph");
     expect(brief?.pushBody).not.toContain("km/h");
+    expect(brief?.body.join(" ")).toContain("1.00 in");
   });
 
   it("warns about tomorrow storms from model weather codes without IMGW warning", () => {
     const brief = buildTomorrowWeatherBrief({
       forecast: forecast([
         hour({ time: "2026-06-15T08:00", temperature: 14, weatherCode: 3, precipitationProbability: 20 }),
-        hour({ time: "2026-06-15T15:00", temperature: 21, weatherCode: 95, precipitationProbability: 30 }),
+        hour({
+          time: "2026-06-15T15:00",
+          temperature: 21,
+          weatherCode: 95,
+          precipitationProbability: 30,
+          precipitation: 25.4,
+        }),
       ]),
       warnings: [],
       province: "mazowieckie",
       countyTeryt: "1465",
       locationName: "Warsaw",
       language: "en",
+      precipitationUnit: "in",
       now: new Date("2026-06-14T16:00:00.000Z"),
     });
 
     expect(brief?.severity).toBe("warning");
     expect(brief?.headline).toBe("Thunderstorms are possible tomorrow");
     expect(brief?.pushBody).toContain("thunderstorms");
+    expect(brief?.pushBody).toContain("1.00 in");
     expect(brief?.pushBody).not.toContain("IMGW");
   });
 

tests/weather-utils.test.ts

@@ -1,9 +1,18 @@
 import { describe, expect, it } from "vitest";
 
 import {
+  DEFAULT_DISTANCE_UNIT,
+  DEFAULT_PRECIPITATION_UNIT,
+  DEFAULT_PRESSURE_UNIT,
   DEFAULT_WIND_SPEED_UNIT,
+  formatDistance,
+  formatPrecipitation,
+  formatPressure,
   formatTemperature,
   formatWindSpeed,
+  isDistanceUnit,
+  isPrecipitationUnit,
+  isPressureUnit,
   isTemperatureUnit,
   isWindSpeedUnit,
 } from "@/lib/weather-utils";
@@ -18,12 +27,40 @@ describe("weather utilities", () => {
     expect(formatTemperature(10, "en", "f")).toBe("50°F");
     expect(formatWindSpeed(4, "en", "mph")).toBe("9 mph");
     expect(formatWindSpeed(4, "en", "ms")).toBe("4.0 m/s");
+    expect(formatWindSpeed(4, "en", "kt")).toBe("8 kt");
+    expect(formatWindSpeed(4, "en", "bft")).toBe("3 Bft");
+  });
+
+  it("formats selected precipitation, pressure and distance units", () => {
+    expect(DEFAULT_PRECIPITATION_UNIT).toBe("mm");
+    expect(DEFAULT_PRESSURE_UNIT).toBe("hpa");
+    expect(DEFAULT_DISTANCE_UNIT).toBe("km");
+
+    expect(formatPrecipitation(25.4, "en", "mm")).toBe("25.4 mm");
+    expect(formatPrecipitation(10, "en", "cm")).toBe("1 cm");
+    expect(formatPrecipitation(25.4, "en", "in")).toBe("1.00 in");
+
+    expect(formatPressure(1013.25, "en", "hpa")).toBe("1,013.3 hPa");
+    expect(formatPressure(1013.25, "en", "kpa")).toBe("101.3 kPa");
+    expect(formatPressure(1013.25, "en", "inhg")).toBe("29.92 inHg");
+    expect(formatPressure(1013.25, "en", "mmhg")).toBe("760 mm Hg");
+
+    expect(formatDistance(10, "en", "km")).toBe("10 km");
+    expect(formatDistance(10, "en", "mi")).toBe("6.2 mi");
   });
 
   it("validates supported presentation units", () => {
     expect(isTemperatureUnit("c")).toBe(true);
     expect(isTemperatureUnit("kelvin")).toBe(false);
     expect(isWindSpeedUnit("kmh")).toBe(true);
+    expect(isWindSpeedUnit("kt")).toBe(true);
+    expect(isWindSpeedUnit("bft")).toBe(true);
     expect(isWindSpeedUnit("knots")).toBe(false);
+    expect(isPrecipitationUnit("in")).toBe(true);
+    expect(isPrecipitationUnit("l")).toBe(false);
+    expect(isPressureUnit("kpa")).toBe(true);
+    expect(isPressureUnit("mbar")).toBe(false);
+    expect(isDistanceUnit("mi")).toBe(true);
+    expect(isDistanceUnit("m")).toBe(false);
   });
 });