// Markdown export and Claude prompt builders.
import {
  formatChunkReference,
  getChunkVerseEntries,
  htmlToPlainText,
} from './bibleUtils.jsx';
import { outlineToMarkdown, timeSummary } from './outline.js';

// ---------------------------------------------------------------------------
// Export / prompt builders (exported for testing)
// ---------------------------------------------------------------------------

export function buildMarkdownExport(project) {
  const chapters = Array.isArray(project.chapters) ? project.chapters : [];

  const chapterSections = chapters.map((ch, chapterIndex) => {
    const chunkSections = ch.chunks.map((chunk) => {
      const scripture = formatChunkReference(project, chapterIndex, chunk, '-');
      const versesText = getChunkVerseEntries(project, chapterIndex, chunk)
        .map((verse) => `> **${verse.chapter}:${verse.number}** ${verse.text}`)
        .join('\n>\n');

      const observation = (chunk.observation ?? '').trim() || '_No observation._';
      const interpretation = (chunk.interpretation ?? '').trim() || '_No interpretation._';
      const application = (chunk.application ?? '').trim() || '_No application._';
      const generalNotes = (chunk.generalNotes ?? '').trim();

      const crossRefsLine = (chunk.crossReferences ?? []).length > 0
        ? `**Cross-References:** ${chunk.crossReferences.join(', ')}\n\n`
        : '';

      const greekSection = chunk.greekWords.length === 0
        ? ''
        : `**Greek/Hebrew Words**\n\n${chunk.greekWords.map((word) => {
            const summary = [
              word.strongNumber,
              word.lexeme,
              word.transliteration && `(${word.transliteration})`,
              word.partOfSpeech,
              word.shortDefinition,
            ].filter(Boolean).join(' — ');
            const definition = word.definitionHtml ? `\n  ${htmlToPlainText(word.definitionHtml)}` : '';
            return `- ${summary}${definition}`;
          }).join('\n')}\n\n`;

      const chunkOutline = (chunk.outline ?? []).length > 0 ? `**Outline**\n\n${outlineToMarkdown(chunk.outline)}\n\n` : '';

      return `### ${scripture}\n\n${versesText}\n\n${chunkOutline}${generalNotes ? `**Background / Notes**\n\n${generalNotes}\n\n` : ''}**Observation**\n\n${observation}\n\n**Interpretation**\n\n${interpretation}\n\n**Application**\n\n${application}\n\n${crossRefsLine}${greekSection}`;
    }).join('---\n\n');

    return `## ${ch.book} ${ch.chapter}\n\n${chunkSections}`;
  }).join('\n');

  const outline = (project.outline ?? []).length > 0 ? `## Outline\n\n${timeSummary(project.outline) ? `*${timeSummary(project.outline)}*\n\n` : ''}${outlineToMarkdown(project.outline)}\n\n` : '';
  return `# ${project.title}\n\n*${project.translation}*\n\n${outline}${chapterSections}`;
}

export function buildChunkBodies(project) {
  const chapters = Array.isArray(project.chapters) ? project.chapters : [];
  let chunkIndex = 0;
  return chapters.map((ch, chapterIndex) => {
    return ch.chunks.map((chunk) => {
      chunkIndex += 1;
      const ref = formatChunkReference(project, chapterIndex, chunk, '–');

      const verses = getChunkVerseEntries(project, chapterIndex, chunk)
        .map((v) => `${v.chapter}:${v.number} ${v.text}`)
        .join('\n');

      const observation = (chunk.observation ?? '').trim() || 'No observation.';
      const interpretation = (chunk.interpretation ?? '').trim() || 'No interpretation.';
      const application = (chunk.application ?? '').trim() || 'No application.';

      const crossRefs = (chunk.crossReferences ?? []).length > 0
        ? chunk.crossReferences.join(', ')
        : 'None.';

      const generalNotes = (chunk.generalNotes ?? '').trim();
      const episodeLabelLine = (chunk.episodeNumber ?? '').trim() || (chunk.episodeTitle ?? '').trim()
        ? `Session: ${[chunk.episodeNumber?.trim(), chunk.episodeTitle?.trim()].filter(Boolean).join(' — ')}\n`
        : '';

      const greekWords = chunk.greekWords.length === 0
        ? 'None.'
        : chunk.greekWords.map((word) => {
            const summary = [
              word.strongNumber,
              word.lexeme,
              word.transliteration && `(${word.transliteration})`,
              word.partOfSpeech,
              word.shortDefinition,
            ].filter(Boolean).join(' | ');
            const definition = word.definitionHtml
              ? `\n  ${htmlToPlainText(word.definitionHtml)}`
              : '';
            return `• ${summary}${definition}`;
          }).join('\n');

      return `===

CHUNK ${chunkIndex} — ${ref}
${episodeLabelLine}
Scripture:
${verses}
${generalNotes ? `\nBackground / General Notes:\n${generalNotes}\n` : ''}
Observation:
${observation}

Interpretation:
${interpretation}

Application:
${application}

Cross-References: ${crossRefs}

Greek Words:
${greekWords}
`;
    }).join('\n');
  }).join('\n');
}

export function buildClaudePrompt(project) {
  const chapters = Array.isArray(project.chapters) ? project.chapters : [];
  const chapterLabel = chapters.map((ch) => `${ch.book} ${ch.chapter}`).join(', ');

  const header = `I've prepared a Bible study on ${chapterLabel} (${project.translation}) and need your help turning my notes into a polished study guide.

Below is my work organised by passage chunk, including my OIA notes and Greek word research. Please create a clear, structured study guide that:
- Synthesises my notes into coherent teaching points
- Naturally integrates the Greek word insights
- Includes 2–3 reflection questions per chunk
- Preserves the passage-by-passage structure

---

PROJECT: ${project.title}
TRANSLATION: ${project.translation}
PASSAGE: ${chapterLabel}
`;

  return header + buildChunkBodies(project);
}

export function buildPodcastPrompt(project, podcastName) {
  const chapters = Array.isArray(project.chapters) ? project.chapters : [];
  const chapterLabel = chapters.map((ch) => `${ch.book} ${ch.chapter}`).join(', ');
  const episodeLabel = 'EPISODE';
  const showName = (podcastName ?? '').trim();
  const showLine = showName || 'MY BIBLE STUDY PODCAST';
  const signOffLine = showName
    ? `Introduce yourself, then sign off with: "...and this is ${showName}."`
    : 'Introduce yourself and the name of the show as a sign-off.';

  const header = `I'm recording an episode of my Bible study podcast${showName ? ` "${showName}"` : ''} and need a full script written from my study notes below.

Please write the script in this exact structure, using the section markers and tone shown:

${showLine.toUpperCase()}
${episodeLabel}
${chapterLabel} (${project.translation})  ·  [estimate XX–XX minutes based on content]

✝  OPENING PRAYER
[Pause before opening the text — invite God into the study]
A short prayer (4-6 sentences) tying into the themes of this passage.

— ✦ —

🎙️  COLD OPEN
[Co-host delivers the cold open solo, if there is one — hands off to the host at the end]
A few short punchy lines previewing the passage and its hook, ending with a hand-off line introducing the host and the show.

— ✦ —

📖  SEGMENT [N] — [SEGMENT TITLE]
[Brief stage direction in brackets]
One segment per passage chunk (use the chunk reference, observation, interpretation, and application notes below as the raw material). Conversational, spoken-word style — not academic prose. Work through the text the way the host would talk it through out loud, weaving in the OIA notes and cross-references naturally.

— ✦ —

📖  SEGMENT [N] — GREEK WORD STUDY
[Work through the key terms — keep it vivid, help the words come alive]
For each Greek/Hebrew word collected below, a block in this format:

[English Gloss] — [English meaning]
[DO NOT READ: original-language word (transliteration) — part of speech]
2-4 sentences unpacking the word's meaning and why it matters for this passage, conversational tone.

— ✦ —

💬  DISCUSSION QUESTIONS
[From the study guide — ${chapterLabel}]
3 reflection questions drawn from the application notes, numbered.

— ✦ —

✦  CLOSING
[Grounded and direct — send them away with something to carry]
A closing reflection that ties the segments together, a short pull-quote from the passage with its reference, then close out. ${signOffLine}
"Until next time — keep studying verse by verse."

— End of Episode —

${showLine}  ·  ${episodeLabel}  ·  ${chapterLabel}

---

Here are my study notes, organised by passage chunk, including my OIA notes, cross-references, and Greek/Hebrew word research:

PROJECT: ${project.title}
TRANSLATION: ${project.translation}
PASSAGE: ${chapterLabel}
`;

  return header + buildChunkBodies(project);
}