import { COIN_KEYWORDS } from './watchlist';

export interface TruthPost {
  url: string;
  ts: number; // Unix ms
  text: string;
}

const esc = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

/** RSS-Items per Regex (kein XML-Parser nötig — Feed ist flach und stabil). */
export function parseTruthFeed(xml: string): TruthPost[] {
  const posts: TruthPost[] = [];
  for (const item of xml.match(/<item>[\s\S]*?<\/item>/g) ?? []) {
    const url = item.match(/<link>([^<]+)<\/link>/)?.[1]?.trim();
    const pubDate = item.match(/<pubDate>([^<]+)<\/pubDate>/)?.[1];
    const descRaw = item.match(/<description>([\s\S]*?)<\/description>/)?.[1] ?? '';
    if (!url || !pubDate) continue;
    const ts = Date.parse(pubDate);
    if (Number.isNaN(ts)) continue;
    const text = descRaw
      .replace(/^<!\[CDATA\[|\]\]>$/g, '')
      .replace(/<[^>]+>/g, ' ')
      .replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&quot;/g, '"').replace(/&#39;/g, "'").replace(/&nbsp;/g, ' ')
      .replace(/\s+/g, ' ')
      .trim();
    posts.push({ url, ts, text });
  }
  return posts;
}

/** Erwähnte Coins (Symbole, dedupliziert, in COIN_KEYWORDS-Reihenfolge). */
export function matchCoins(text: string): string[] {
  const hits: string[] = [];
  for (const c of COIN_KEYWORDS) {
    const nameHit = c.names.some((n) => new RegExp(`\\b${esc(n)}\\b`, 'i').test(text));
    const tickerHit = c.tickers.some((t) => new RegExp(`\\b${esc(t)}\\b`).test(text)); // case-sensitive
    if (nameHit || tickerHit) hits.push(c.symbol);
  }
  return hits;
}