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

function getDateRange() {
  const to = new Date();
  const from = new Date(to);
  from.setDate(from.getDate() - 1);

  return {
    from: from.toISOString().slice(0, 10),
    to: to.toISOString().slice(0, 10),
  };
}

async function fetchFinnhubArticles() {
  if (!config.finnhub?.apiKey) {
    return [];
  }

  const { from, to } = getDateRange();
  const articles = [];

  for (const symbol of config.finnhub.tickers || []) {
    const params = new URLSearchParams({
      symbol,
      from,
      to,
      token: config.finnhub.apiKey,
    });

    const data = await fetchJson(`https://finnhub.io/api/v1/company-news?${params.toString()}`);
    for (const item of data || []) {
      const title = String(item.headline || '').trim();
      const url = String(item.url || '').trim();

      if (!title || !url) {
        continue;
      }

      articles.push({
        title,
        description: item.summary || null,
        url,
        source: 'finnhub',
        pubDate: item.datetime ? new Date(item.datetime * 1000).toISOString() : null,
      });
    }
  }

  return articles;
}

module.exports = {
  fetchFinnhubArticles,
};