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lib/weather/providers/openweather/shared.ts

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+import type { Condition } from "../../types";
+
+/** Shared by both OpenWeather plans. */
+
+export const OWM_LABEL = "OpenWeather";
+
+export interface OwmWeatherTag {
+  id: number;
+  description: string;
+  icon: string; // ends in "d" (day) or "n" (night)
+}
+
+/** Condition codes: https://openweathermap.org/weather-conditions */
+export function toCondition(code: number): Condition {
+  if (code >= 200 && code < 300) return "storm";
+  if (code >= 300 && code < 600) return "rain"; // drizzle + rain
+  if (code >= 600 && code < 700) return "snow";
+  if (code >= 700 && code < 800) return "fog"; // mist, haze, smoke, dust…
+  if (code === 800) return "clear";
+  return "clouds";
+}
+
+/** OpenWeather gives probability of precipitation as 0–1; we use 0–100. */
+export function popToPercent(pop: number | undefined): number | null {
+  return pop === undefined ? null : Math.round(pop * 100);
+}
+
+/** Rain + snow volume, either of which may be missing. */
+export function precipitation(rain?: number, snow?: number): number | null {
+  if (rain === undefined && snow === undefined) return null;
+  return Math.round(((rain ?? 0) + (snow ?? 0)) * 10) / 10;
+}