// Today's verse of the day for the push notification: IQ Bible picks it (the same verse for everyone each UTC day),
// in the KJV, which is free to quote. Needs IQBIBLE_API_KEY on the server. One lookup a day serves every user.
import { bookNameFor } from './bibleApi.js';

let cached = null; // { date, verse }

export const votdAvailable = () => Boolean(process.env.IQBIBLE_API_KEY);

// IQ Bible's answer -> { reference, text }, or null when it isn't one we can use
export function parseVotd(body) {
  const d = body?.data;
  const book = bookNameFor(d?.book_usfm);
  if (!book || !d?.chapter_number || !d?.verse_number || typeof d.text !== 'string' || !d.text.trim()) return null;
  return { reference: `${book} ${d.chapter_number}:${d.verse_number}`, text: d.text.replace(/^[¶§*\s]+/, '').replace(/\s+/g, ' ').trim() };
}

export async function fetchVerseOfDay(now = new Date(), fetcher = fetch) {
  const date = now.toISOString().slice(0, 10);
  if (cached?.date === date) return cached.verse;
  if (!votdAvailable()) return null;
  const base = (process.env.IQBIBLE_API_BASE || 'https://api.iqbible.com/api/v2').replace(/\/+$/, '');
  try {
    const res = await fetcher(`${base}/bibles/eng_kjv/verse-of-the-day`, { headers: { 'X-IQBible-API-Key': process.env.IQBIBLE_API_KEY }, signal: AbortSignal.timeout(10_000) });
    if (!res.ok) return null;
    const verse = parseVotd(await res.json());
    if (verse) cached = { date, verse };
    return verse;
  } catch { return null; }
}

export const clearVotdCache = () => { cached = null; };

export const votdMessage = ({ reference, text }) => ({ title: `Verse of the day: ${reference}`, body: `${text}\n\n${reference} (KJV)`, tags: 'sunrise' });