/**
 * packageOutputs.ts
 * Writes the final output package:
 * - carousel.json (full CarouselDocument)
 * - carousel_manifest.json (metadata summary)
 * - linkedin_caption.txt (3 caption variants with hashtags)
 */

import fs from 'fs';
import path from 'path';

import type { CarouselDocument, CarouselManifest } from '../schema/carouselSchema';

// ---------------------------------------------------------------------------
// Caption generator
// ---------------------------------------------------------------------------

/**
 * Generate 3 LinkedIn caption variants for the carousel post.
 * Each variant has a different tone (professional, story-driven, punchy).
 */
function generateCaptions(doc: CarouselDocument): string {
  const { positioningAngle, fitAnalysis, targetRoleProfile, highlights } = doc;
  const topHighlight = highlights[0];
  const metricHint = topHighlight
    ? topHighlight.text.match(/(\$[\d,]+[KMBkm]?|\d+[%xX])/)?.[0] ?? ''
    : '';
  const role = targetRoleProfile.title;
  const topAlignment = fitAnalysis.strongestAlignments[0]?.area ?? '';
  const headline = positioningAngle.headline;

  // Role-appropriate hashtags
  const baseHashtags = ['#OpenToWork', '#CareerCarousel', '#LinkedInCarousel'];
  const domainTags = targetRoleProfile.domainClues.slice(0, 2).map(
    (d) => `#${d.replace(/\s+/g, '')}`
  );
  const skillTags = targetRoleProfile.requiredSkills
    .slice(0, 3)
    .map((s) => `#${s.replace(/[^a-zA-Z0-9]/g, '')}`);
  const hashtags = [...baseHashtags, ...domainTags, ...skillTags].join(' ');

  const variant1 = `
--- Caption Variant 1: Professional / Recruiter-facing ---

${headline}

Swipe through to see why I'm a strong fit for ${role} roles — and how my experience maps to what teams actually need.

${topAlignment ? `Strong in: ${topAlignment}.` : ''}${metricHint ? ` Results like ${metricHint}.` : ''}

If you're hiring or know someone who is, I'd love to connect.

${hashtags}
`.trim();

  const variant2 = `
--- Caption Variant 2: Story-driven / Personal ---

${topHighlight ? `"${topHighlight.text.slice(0, 100)}${topHighlight.text.length > 100 ? '…' : ''}"` : 'Real work. Real results.'}

That's the kind of work I do. And now I'm looking for the next place to do it — in a ${role} role where I can make a real difference.

Swipe to see the full picture →

${hashtags}
`.trim();

  const variant3 = `
--- Caption Variant 3: Punchy / Short ---

${headline.split('—')[0]?.trim() ?? headline}

→ ${role} opportunities
→ ${topAlignment ? `Deep ${topAlignment} background` : 'Strong cross-functional background'}
→ ${metricHint ? `Proven results (${metricHint})` : 'Proven track record'}

Open to the right conversation. DM me or connect.

${hashtags}
`.trim();

  return [variant1, variant2, variant3].join('\n\n' + '='.repeat(60) + '\n\n');
}

// ---------------------------------------------------------------------------
// Main packager
// ---------------------------------------------------------------------------

/**
 * Write all output package files and return the CarouselManifest.
 */
export async function packageOutputs(
  doc: CarouselDocument,
  outputDir: string,
  options: {
    pdfPath?: string;
    pngPaths?: string[];
    mode: string;
    theme: string;
    inputResumeFile: string;
    inputJdFile: string;
  }
): Promise<CarouselManifest> {
  fs.mkdirSync(outputDir, { recursive: true });

  // 1. Write full document JSON
  const jsonPath = path.join(outputDir, 'carousel.json');
  fs.writeFileSync(jsonPath, JSON.stringify(doc, null, 2), 'utf-8');
  console.log('  ✓ Written: carousel.json');

  // 2. Write LinkedIn captions
  const captionPath = path.join(outputDir, 'linkedin_caption.txt');
  const captionText = generateCaptions(doc);
  fs.writeFileSync(captionPath, captionText, 'utf-8');
  console.log('  ✓ Written: linkedin_caption.txt');

  // 3. Build manifest
  const manifest: CarouselManifest = {
    generatedAt: new Date().toISOString(),
    version: '1.0.0',
    inputFiles: {
      resume: options.inputResumeFile,
      jd: options.inputJdFile,
    },
    outputFiles: {
      pdf: options.pdfPath ?? path.join(outputDir, 'linkedin_carousel.pdf'),
      pngs: options.pngPaths ?? [],
      caption: captionPath,
      json: jsonPath,
      manifest: path.join(outputDir, 'carousel_manifest.json'),
    },
    mode: doc.positioningAngle.mode,
    theme: options.theme,
    slideCount: doc.slides.length,
    positioningAngle: {
      headline: doc.positioningAngle.headline,
      mode: doc.positioningAngle.mode,
      compositeScore: doc.positioningAngle.compositeScore,
    },
    topHighlights: doc.highlights.slice(0, 3).map((h) => ({
      text: h.text,
      totalScore: h.totalScore,
      rationale: h.rationale,
    })),
    notableGaps: doc.fitAnalysis.notableGaps,
    overallFitScore: doc.fitAnalysis.overallFitScore,
  };

  // 4. Write manifest JSON
  const manifestPath = path.join(outputDir, 'carousel_manifest.json');
  fs.writeFileSync(manifestPath, JSON.stringify(manifest, null, 2), 'utf-8');
  console.log('  ✓ Written: carousel_manifest.json');

  return manifest;
}