const config = require('../config');
const { fetchJson } = require('../http');

let tickerMap;

function getHeaders() {
  return {
    headers: {
      'User-Agent': config.sec.userAgent,
      Accept: 'application/json',
    },
  };
}

async function getTickerMap() {
  if (tickerMap) {
    return tickerMap;
  }

  const data = await fetchJson('https://www.sec.gov/files/company_tickers.json', getHeaders());
  tickerMap = Object.values(data).reduce((acc, company) => {
    acc[String(company.ticker || '').toUpperCase()] = String(company.cik_str || '').padStart(10, '0');
    return acc;
  }, {});

  return tickerMap;
}

async function fetchEdgarArticles() {
  const tickers = config.sec?.tickers || [];
  if (tickers.length === 0) {
    return [];
  }

  const map = await getTickerMap();
  const articles = [];

  for (const ticker of tickers) {
    const cik = map[String(ticker).toUpperCase()];
    if (!cik) {
      continue;
    }

    const data = await fetchJson(`https://data.sec.gov/submissions/CIK${cik}.json`, getHeaders());
    const recent = data.filings?.recent;
    if (!recent) {
      continue;
    }

    for (let i = 0; i < recent.form.length; i += 1) {
      if (recent.form[i] !== '8-K') {
        continue;
      }

      const accession = String(recent.accessionNumber[i] || '').replace(/-/g, '');
      const primaryDocument = String(recent.primaryDocument[i] || '').trim();
      const filingDate = recent.filingDate[i] || null;

      if (!accession || !primaryDocument) {
        continue;
      }

      articles.push({
        title: `${String(ticker).toUpperCase()} 8-K ${filingDate || accession}`,
        description: `${String(data.name || ticker).trim()} filed Form 8-K`,
        url: `https://www.sec.gov/Archives/edgar/data/${Number(cik)}/${accession}/${primaryDocument}`,
        source: 'edgar',
        pubDate: filingDate,
      });
    }
  }

  return articles;
}

module.exports = {
  fetchEdgarArticles,
};