import { normalizeWarning } from "@/lib/weather-utils";
import { isImgwNoProductsResponse, readImgwResponseBody } from "@/lib/imgw-empty-response";
import type { RawWarning, WeatherWarning } from "@/types/imgw";

const IMGW_WARNINGS_METEO_URL = "https://danepubliczne.imgw.pl/api/data/warningsmeteo";
const USER_AGENT = "wtr./1.0 (weather notification worker)";

export async function fetchMeteoWarnings(signal?: AbortSignal): Promise<WeatherWarning[]> {
  const response = await fetch(IMGW_WARNINGS_METEO_URL, {
    headers: { accept: "application/json", "user-agent": USER_AGENT },
    next: { revalidate: 300 },
    signal,
  });
  if (!response.ok) {
    const details = await readImgwResponseBody(response);
    if (response.status === 404 && isImgwNoProductsResponse(details.json)) return [];
    throw new Error(
      `Unable to load IMGW meteorological warnings: ${response.status}${details.text ? ` ${details.text.slice(0, 240)}` : ""}`,
    );
  }
  const rows = (await response.json()) as RawWarning[];
  return Array.isArray(rows) ? rows.map((warning, index) => normalizeWarning(warning, "meteo", index)) : [];
}