// Comparing translations of one chunk: which chapter(s) and verses to fetch, and the verses lined up by number.
import { getChunkVerseEntries } from './bibleUtils.jsx';

// -> [{ bookAbbrev, book, chapter, from, to }]: one entry per chapter the chunk covers (two when it spills over).
export function translationSpans(project, chapterIndex, chunk) {
  const spans = [];
  for (const v of getChunkVerseEntries(project, chapterIndex, chunk)) {
    const last = spans[spans.length - 1];
    if (last && last.chapter === v.chapter && last.book === v.book) { last.to = Math.max(last.to, v.number); last.from = Math.min(last.from, v.number); continue; }
    const chapter = project.chapters.find((c) => c.book === v.book && String(c.chapter) === String(v.chapter));
    spans.push({ bookAbbrev: chapter?.bookAbbrev, book: v.book, chapter: v.chapter, from: v.number, to: v.number });
  }
  return spans;
}

// byTranslation: { BSB: { verses: [{ number, text }] }, … } for the chapters in `spans`; `loaded` is keyed by
// `${chapter}` inside each translation. -> [{ key, label, texts: { BSB: 'text' | null } }] one row per verse, in order.
export function alignVerses(spans, byTranslation) {
  const rows = [];
  for (const span of spans) {
    for (let n = span.from; n <= span.to; n += 1) {
      const texts = {};
      for (const [id, chapters] of Object.entries(byTranslation)) {
        texts[id] = chapters?.[`${span.book}|${span.chapter}`]?.find((v) => v.number === n)?.text ?? null;
      }
      rows.push({ key: `${span.book}${span.chapter}:${n}`, label: spans.length > 1 ? `${span.chapter}:${n}` : String(n), texts });
    }
  }
  return rows;
}