#!/usr/bin/env node

import { loadEnvFile, CHROME_UA, runSeed } from './_seed-utils.mjs';
import { wbCountryDictContentMeta } from './_wb-country-dict-content-age-helpers.mjs';
import iso3ToIso2 from './shared/iso3-to-iso2.json' with { type: 'json' };

loadEnvFile(import.meta.url);

const WB_BASE = 'https://api.worldbank.org/v2';
const CANONICAL_KEY = 'resilience:recovery:reserve-adequacy:v1';
const CACHE_TTL = 35 * 24 * 3600;
const INDICATOR = 'FI.RES.TOTL.MO';
// Content-age budget — World Bank annual indicator, ~2-year reporting lag.
// 48 months clears the lag plus a publication cycle; STALE_CONTENT fires only
// when WB stops publishing for 2+ annual cycles. See issue #3845.
const MAX_CONTENT_AGE_MIN = 48 * 30 * 24 * 60;

async function fetchReserveAdequacy() {
  const pages = [];
  let page = 1;
  let totalPages = 1;

  while (page <= totalPages) {
    // mrv=5 (NOT mrv=1) per memory `feedback_wb_bulk_mrv1_null_coverage_trap`:
    // mrv=1 returns a SINGLE year across all countries with `value: null`
    // for late-reporters (KW/QA/AE/etc. publish 1-2y behind G7), silently
    // dropping them from the dataset. mrv=5 + per-country pickLatest gives
    // a true latest-available-non-null per country.
    const url = `${WB_BASE}/country/all/indicator/${INDICATOR}?format=json&per_page=500&page=${page}&mrv=5`;
    const resp = await fetch(url, {
      headers: { 'User-Agent': CHROME_UA },
      signal: AbortSignal.timeout(30_000),
    });
    if (!resp.ok) throw new Error(`World Bank ${INDICATOR}: HTTP ${resp.status}`);
    const json = await resp.json();
    const meta = json[0];
    const records = json[1] ?? [];
    totalPages = meta?.pages ?? 1;
    pages.push(...records);
    page++;
  }

  const countries = {};
  for (const record of pages) {
    const rawCode = record?.countryiso3code ?? record?.country?.id ?? '';
    const iso2 = rawCode.length === 3 ? (iso3ToIso2[rawCode] ?? null) : (rawCode.length === 2 ? rawCode : null);
    if (!iso2) continue;
    // CRITICAL: skip null records BEFORE Number() coercion.
    // Number(null) === 0 (not NaN), which would pass Number.isFinite()
    // and let a `value: null` record overwrite an older non-null record
    // in the latest-picker below — silently defeating the mrv=5 +
    // pickLatest fix. WB returns null for late-reporters; those must
    // not be coerced to 0 reserveMonths. Spotted by reviewer post-PR-#3427.
    if (record?.value == null) continue;
    const value = Number(record.value);
    if (!Number.isFinite(value)) continue;
    const year = Number(record?.date);
    if (!Number.isFinite(year)) continue;

    // Per-country latest-non-null (mrv=5 returns up to 5 records per country).
    const existing = countries[iso2];
    if (!existing || year > existing.year) {
      countries[iso2] = {
        reserveMonths: value,
        year,
      };
    }
  }

  return { countries, seededAt: new Date().toISOString() };
}

function validate(data) {
  return typeof data?.countries === 'object' && Object.keys(data.countries).length >= 100;
}

export function declareRecords(data) {
  return Object.keys(data?.countries || {}).length;
}

if (process.argv[1]?.endsWith('seed-recovery-reserve-adequacy.mjs')) {
  runSeed('resilience', 'recovery:reserve-adequacy', CANONICAL_KEY, fetchReserveAdequacy, {
    validateFn: validate,
    ttlSeconds: CACHE_TTL,
    sourceVersion: `wb-reserves-${new Date().getFullYear()}`,
    recordCount: (data) => Object.keys(data?.countries ?? {}).length,
  
    declareRecords,
    schemaVersion: 1,
    maxStaleMin: 86400,
    contentMeta: wbCountryDictContentMeta,
    maxContentAgeMin: MAX_CONTENT_AGE_MIN,
  }).catch((err) => {
    const _cause = err.cause ? ` (cause: ${err.cause.message || err.cause.code || err.cause})` : '';
    console.error('FATAL:', (err.message || err) + _cause);
    process.exit(1);
  });
}
