const axios = require("axios");

async function loc(lng, lat) {
  const primary = await place(lng, lat);        // Geoapify
  const fallback = await placePhoton(lng, lat); // Photon

  if (!primary) return fallback;

  if (!primary.city && fallback?.city) {
    primary.city = fallback.city;
  }

  if (!primary.postcode && fallback?.postcode) {
    primary.postcode = fallback.postcode;
  }

  if (!primary.address && fallback?.address) {
    primary.address = fallback.address;
  }

  if (!primary.region && fallback?.region) {
    primary.region = fallback.region;
  }

  if (!primary.country_code && fallback?.country_code) {
    primary.country_code = fallback.country_code;
  }

  if (!primary.county && fallback?.county) {
    primary.county = fallback.county;
  }

  if (!primary.county_code && fallback?.county_code) {
    primary.county_code = fallback.county_code;
  }

  return primary;
}

function normCountryCode(v) {
  if (!v) return undefined;
  const s = String(v).trim().toUpperCase();
  return s.length ? s : undefined;
}

async function place(lng, lat) {
  const apiKey = "6dc7fb95a3b246cfa0f3bcef5ce9ed9a";
  const url = `https://api.geoapify.com/v1/geocode/reverse?lat=${lat}&lon=${lng}&apiKey=${apiKey}`;

  try {
    const r = await axios.get(url);

    if (r.status !== 200) return undefined;
    if (!r.data.features || r.data.features.length === 0) return undefined;

    const k = r.data.features[0].properties;

    return {
      continent: k?.timezone?.name?.split("/")?.[0] || undefined,

      // Country / Paese
      country: k?.country || undefined,
      country_code: normCountryCode(k?.country_code),

      // County / contea
      county: k?.county || undefined,
      county_code: k?.county_code || undefined,

      // Regione / stato amministrativo
      region: k?.state || undefined,

      postcode: k?.postcode || undefined,
      city: k?.city || k?.town || k?.village || undefined,
      address: k?.address_line1 || undefined,
      timezone: k?.timezone?.name || undefined,
      time: k?.timezone?.offset_STD || undefined,
    };
  } catch (err) {
    return undefined;
  }
}

async function placePhoton(lng, lat) {
  try {
    const url = `https://photon.patachina.it/reverse?lon=${lng}&lat=${lat}`;
    const r = await axios.get(url);

    if (!r.data || !r.data.features || r.data.features.length === 0) {
      return undefined;
    }

    const p = r.data.features[0].properties;

    return {
      continent: undefined,

      // Country / Paese
      country: p.country || undefined,
      country_code: normCountryCode(p.countrycode || p.country_code),

      // County / contea, se disponibile
      county: p.county || undefined,
      county_code: p.county_code || undefined,

      region: p.state || undefined,
      postcode: p.postcode || undefined,
      city: p.city || p.town || p.village || undefined,
      address: p.street ? `${p.street} ${p.housenumber || ""}`.trim() : undefined,
      timezone: undefined,
      time: undefined,
    };
  } catch (err) {
    return undefined;
  }
}

module.exports = loc;