// A study started from one day of a reading plan: a chunk for each whole chapter in the day, with the notes template
// you last used when starting a study by hand (so the prompts and starter text are the ones you're used to).
import { templateStarter } from './studyTemplates.js';

export const lastTemplateId = () => { try { return localStorage.getItem('last-template') || 'blank'; } catch { return 'blank'; } };
export const rememberTemplate = (id) => { try { localStorage.setItem('last-template', id || 'blank'); } catch { /* storage unavailable */ } };

// chapters: [{ bookAbbrev, bookName, chapter, verses: [{ number, text }] }]; ids come from `makeId`.
export function planStudyProject({ chapters, title, templateId = 'blank', templateDef = null, makeId, now = Date.now() }) {
  const built = chapters.map(({ bookAbbrev, bookName, chapter, verses }) => ({
    book: bookName, bookAbbrev, chapter: String(chapter), verses,
    chunks: [{
      id: makeId(),
      startVerse: verses[0]?.number ?? 1,
      endVerse: verses.at(-1)?.number ?? 1,
      spilloverEndVerse: null,
      observation: '', interpretation: '', application: '',
      crossReferences: [], greekWords: [], generalNotes: '',
      episodeNumber: '', episodeTitle: '', finalScript: '', tags: [],
      ...templateStarter(templateDef ?? templateId),
    }],
  }));
  return {
    id: makeId(),
    title: title || 'Reading Plan Study',
    translation: 'BSB',
    templateId,
    ...(templateDef ? { templateDef } : {}),
    lastEdited: now,
    selectedChunkId: built[0]?.chunks[0]?.id ?? null,
    chapters: built,
  };
}