/*
 * build-reels.mjs — the faceless Reel generator.
 *
 * Turns prompts into upload-ready vertical MP4s (1080×1920, 30fps, silent — add
 * the trending sound in-app). Renders `reel-template.html` frame-by-frame headless
 * (Playwright), encodes with ffmpeg, and writes a hosted gallery (`reels/index.html`)
 * with each video + caption + music cue. This is the CONSISTENCY layer only — the
 * real-reaction Reels stay human (see instagram-channel.md).
 *
 *   node apps/dare-night/marketing/build-reels.mjs
 *
 * Edit the BATCH below to swap prompts (there are 409 — sweep packs, rotate hooks),
 * then re-run; it overwrites reels/. Prompts + music here mirror ig-post-plan.
 * Needs: Playwright (global) + ffmpeg on PATH.
 */
import { execFileSync } from 'node:child_process';
import { mkdirSync, rmSync, writeFileSync, readdirSync, unlinkSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, join, resolve } from 'node:path';
import { createRequire } from 'node:module';
const require = createRequire(import.meta.url);
const { chromium } = require('/opt/node22/lib/node_modules/playwright');

const HERE = dirname(fileURLToPath(import.meta.url));
// Output dir is configurable — the reels' real home is the studio-assets kit
// (apps/dare-night/marketing/reels), served from dare-night.app/marketing/reels/.
//   REELS_OUT=./reels node build-reels.mjs
const OUT = process.env.REELS_OUT ? resolve(process.env.REELS_OUT) : join(HERE, 'reels');
// ffmpeg may not be on PATH (e.g. cloud env) — Playwright ships one:
//   FFMPEG=/opt/pw-browsers/ffmpeg-<v>/ffmpeg-linux node build-reels.mjs
const FFMPEG = process.env.FFMPEG || 'ffmpeg';
const TEMPLATE = 'file://' + join(HERE, 'reel-template.html');
const FPS = 30, DUR = 12000, N = Math.round(DUR / 1000 * FPS); // 12s: CTA (fades in ~9s) now holds ~2.5s, readable

// Pack accents (canon): classic #FFEE00 · crush #FF50C8 · spicy #FF7A00 · confessions #9B5DE5 · chaos #FF0040
// A month of faceless prompt-reveal reels — 3 per pack, sweeping all 5 packs,
// TRUTH/DARE rotated. Every prompt is REAL (pulled from content/prompts.js).
// Music is a VIBE + examples — verify what's actually trending the day you post;
// a royalty-safe fallback (Instagram's Commercial library) is named each time.
const BATCH = [
  // ── 🎉 Classic (#FFEE00) ──
  { pack:'🎉 Classic Party', pk:'#FFEE00', tag:'TRUTH',
    prompt:'What’s the worst decision you made that somehow became a great story?',
    hook:'the question that makes<br>everyone lean in 🎉', nudge:'we need the whole story.',
    music:'Upbeat/trending, drop on the reveal · ex: This Girl — Kungs (~0:37) · fallback: bright pop, Commercial lib. [VERIFY day-of]',
    caption:'The exact second everyone leans in 😅 Every group has one “worst decision → best story.”\nFree, no download — link in bio.\n#truthordare #partygame #gamenight #icebreaker #friendgroup #storytime #darenight #reels #hostellife #travelbuddies' },
  { pack:'🎉 Classic Party', pk:'#FFEE00', tag:'DARE',
    prompt:'Give someone here a compliment that sounds like a warning.',
    hook:'watch them try to work out<br>if that was a compliment 😅', nudge:'deliver it dead serious.',
    music:'Playful/deadpan · ex: Levitating — Dua Lipa (~0:53) · fallback: quirky upbeat, Commercial lib. [VERIFY]',
    caption:'Watching someone work out whether that was a compliment 😅\nTruth or Dare for the whole room — free, link in bio.\n#truthordare #partygame #gamenight #funny #icebreaker #darenight #reels #hostellife #backpackers' },
  { pack:'🎉 Classic Party', pk:'#FFEE00', tag:'TRUTH',
    prompt:'Who here would you trust to lie for the group with confidence?',
    hook:'everyone looks at the<br>same person 🎉', nudge:'no hesitation.',
    music:'Cheeky/bouncy · ex: a trending “callout” sound · fallback: playful funk, Commercial lib. [VERIFY]',
    caption:'There’s a half-second where the whole table looks at the same person 👀\nFree, no download — dare-night.app.\n#truthordare #partygame #friendgroup #gamenight #callout #darenight #reels #travelbuddies #hostellife' },
  // ── 💘 Crush (#FF50C8) ──
  { pack:'💘 Crush Mode', pk:'#FF50C8', tag:'TRUTH',
    prompt:'What’s the smallest thing someone can do that makes you suddenly interested?',
    hook:'the pause before<br>they answer 💘', nudge:'be honest. we saw that smile.',
    music:'Smooth/flirty chorus · ex: One Kiss — Calvin Harris & Dua Lipa (~0:48) · fallback: mellow R&B, Commercial lib. [VERIFY]',
    caption:'The pause before they answer, when everyone already knows 💘\nFree at dare-night.app.\n#truthordare #crush #situationship #partygame #datingbelike #couplegoals #darenight #reels #travelcouples #backpackers' },
  { pack:'💘 Crush Mode', pk:'#FF50C8', tag:'DARE',
    prompt:'Give someone a compliment that sounds almost too honest.',
    hook:'the part where you<br>have to look at them 💘', nudge:'no flinching.',
    music:'Warm/tender · ex: Adore You — Harry Styles (~0:48) · fallback: soft indie-pop, Commercial lib. [VERIFY]',
    caption:'Saying the honest one out loud, to their face 💘 The room goes very quiet.\nFree at dare-night.app.\n#truthordare #crush #partygame #flirty #couplegoals #darenight #reels #travelcouples #hostellife' },
  { pack:'💘 Crush Mode', pk:'#FF50C8', tag:'TRUTH',
    prompt:'What’s your dumbest weakness when you like someone?',
    hook:'ten minutes in and<br>everyone knows everything 💘', nudge:'we all have one.',
    music:'Playful-embarrassed · ex: a trending “caught” sound · fallback: light pop, Commercial lib. [VERIFY]',
    caption:'Ten minutes in and everyone knows something new about everyone 💘😭\nIt’s free. Play it with your people.\n#truthordare #crush #situationship #relatable #partygame #darenight #reels #travelbuddies #backpackers' },
  // ── 🌶️ Spicy (#FF7A00) ──
  { pack:'🌶️ Spicy But Safe', pk:'#FF7A00', tag:'TRUTH',
    prompt:'Who here looks like trouble in a good outfit?',
    hook:'the part where you have<br>to say it out loud 😏', nudge:'point. no take-backs.',
    music:'Confident/flirty beat · ex: Tití Me Preguntó — Bad Bunny (~0:50) · fallback: sultry groove, Commercial lib. [VERIFY]',
    caption:'Nobody’s brave until the room is already laughing 😏\nFree, no download — link in bio.\n#truthordare #partygame #spicy #girlsnight #nightout #friendgroup #darenight #reels #hostellife #girlswhotravel' },
  { pack:'🌶️ Spicy But Safe', pk:'#FF7A00', tag:'TRUTH',
    prompt:'What innocent thing do you find unfairly attractive?',
    hook:'the whole table<br>reacts at once 🌶️', nudge:'be specific 👀',
    music:'Smirky/slow-burn · ex: a trending sultry sound · fallback: smooth bass, Commercial lib. [VERIFY]',
    caption:'The answer lands and the whole table reacts at once 👀\nFree at dare-night.app.\n#truthordare #spicy #partygame #flirty #nightout #darenight #reels #hostellife #backpackers' },
  { pack:'🌶️ Spicy But Safe', pk:'#FF7A00', tag:'DARE',
    prompt:'Let the group pick someone. Hold eye contact for 10 seconds.',
    hook:'10 seconds.<br>no looking away 🌶️', nudge:'the room counts out loud.',
    music:'Tension-building · ex: a trending countdown sound · fallback: cinematic build, Commercial lib. [VERIFY]',
    caption:'Ten seconds of eye contact with someone you met this morning 🌶️\nFree — dare-night.app.\n#truthordare #spicy #partygame #eyecontact #friendgroup #darenight #reels #hostellife #travelbuddies' },
  // ── 🌑 Confessions (#9B5DE5) ──
  { pack:'🌑 Deep Confessions', pk:'#9B5DE5', tag:'TRUTH',
    prompt:'When did you last pretend you were fine?',
    hook:'the one that makes<br>the table go quiet 🌑', nudge:'take your time.',
    music:'Soft/emotional · ex: Until I Found You — Stephen Sanchez · fallback: gentle piano, Commercial lib. [VERIFY]',
    caption:'Save this for the people you actually want to know better 🌑\nA party game with a heart. Free — link in bio.\n#truthordare #deeptalks #meaningfulconversations #connection #friendship #darenight #reels #solotravel #hostellife' },
  { pack:'🌑 Deep Confessions', pk:'#9B5DE5', tag:'DARE',
    prompt:'Tell someone here one thing you admire about them but never say.',
    hook:'the thing you’ve been<br>meaning to say 🌑', nudge:'look at them.',
    music:'Tender/warm · ex: a soft emotional trend · fallback: warm acoustic, Commercial lib. [VERIFY]',
    caption:'The thing you’ve been meaning to say, finally said out loud 🌑\nFree at dare-night.app.\n#truthordare #deeptalks #friendship #couplegoals #vulnerability #darenight #reels #travelcouples #solotravel' },
  { pack:'🌑 Deep Confessions', pk:'#9B5DE5', tag:'TRUTH',
    prompt:'What compliment do you struggle to believe?',
    hook:'the soft one 🌑', nudge:'we’re listening.',
    music:'Reflective/quiet · ex: a mellow trending sound · fallback: ambient piano, Commercial lib. [VERIFY]',
    caption:'A party game that made the room go gentle for a second 🌑\nFree — dare-night.app.\n#truthordare #deeptalks #selflove #meaningfulconversations #connection #darenight #reels #solotravel #hostellife' },
  // ── 💀 Chaos (#FF0040) ──
  { pack:'💀 Chaos Dares', pk:'#FF0040', tag:'DARE',
    prompt:'Walk away from the group, then return like everyone owes you money.',
    hook:'the face of someone who<br>just got handed a dare 💀', nudge:'who’s actually doing it?',
    music:'Hard drop on the walk-in · ex: Turn Down for What — DJ Snake & Lil Jon (~0:12) · fallback: big trap drop, Commercial lib. [VERIFY]',
    caption:'The three seconds before someone decides to fully commit 💀\nFree at dare-night.app.\n#truthordare #darenight #partygame #chaos #dares #funny #reels #hostellife #backpackers' },
  { pack:'💀 Chaos Dares', pk:'#FF0040', tag:'DARE',
    prompt:'Point at one player and say, “You know exactly what you did.” Refuse to explain.',
    hook:'no context.<br>just chaos 💀', nudge:'hold the stare.',
    music:'Dramatic sting · ex: a trending “no context” sound · fallback: suspense hit, Commercial lib. [VERIFY]',
    caption:'No explanation. The room just watches it happen 💀\nFree — dare-night.app.\n#truthordare #chaos #dares #partygame #funny #friendgroup #darenight #hostellife #travelbuddies' },
  { pack:'💀 Chaos Dares', pk:'#FF0040', tag:'TRUTH',
    prompt:'What’s the dumbest thing you’ve done because the room had too much energy?',
    hook:'story starts with<br>“so everyone was chanting…” 💀', nudge:'we need names.',
    music:'Fast/chaotic build · ex: a trending hype sound · fallback: energetic punk-pop, Commercial lib. [VERIFY]',
    caption:'Every group has an “and then the whole room was chanting” story 💀 This is where they come from.\nTruth or Dare for the whole room — free.\n#truthordare #chaos #partygame #storytime #friendgroup #funny #darenight #hostellife #backpackers' },
];

function enc(item, t) {
  const p = new URLSearchParams({ pack:item.pack, pk:item.pk, tag:item.tag, prompt:item.prompt,
    hook:item.hook, nudge:item.nudge, t:String(t) });
  return TEMPLATE + '?' + p.toString();
}

mkdirSync(OUT, { recursive:true });

// ── PRECHECK before destroying anything (added 2026-07-29, Lina's QA) ──────────────
// This script used to unlink every reel-*.mp4/.txt + index.html BEFORE verifying ffmpeg
// existed. Running it without ffmpeg on PATH therefore DELETED all 15 rendered reels and
// their approved captions, then crashed — real data loss, hit for real during QA. The reels
// now live in the product repo and the captions are founder-approved copy, so the blast
// radius got bigger. Fail before touching a single file.
try {
  execFileSync('ffmpeg', ['-version'], { stdio:'ignore' });
} catch {
  console.error('✖ ffmpeg not found on PATH — aborting BEFORE deleting anything.\n' +
    '  This script replaces reel-*.mp4/.txt and index.html in ' + OUT + ',\n' +
    '  so it refuses to run without an encoder. Install ffmpeg, then re-run.');
  process.exit(1);
}

// Non-destructive: clear ONLY previously-generated files, never the whole dir —
// so a re-run keeps hand-added content in the kit (e.g. the archived posted/).
for (const f of readdirSync(OUT)) {
  if (/^reel-\d+\.(mp4|txt)$/.test(f) || f === 'index.html') { try { unlinkSync(join(OUT, f)); } catch {} }
}
const tmp = join(OUT, '_frames');

const browser = await chromium.launch();
const page = await browser.newPage({ viewport:{ width:1080, height:1920 }, deviceScaleFactor:1 });

const built = [];
for (let idx = 0; idx < BATCH.length; idx++) {
  const item = BATCH[idx];
  rmSync(tmp, { recursive:true, force:true }); mkdirSync(tmp);
  // load once with content params, then just seek per frame
  await page.goto(enc(item, 0), { waitUntil:'networkidle' });
  for (let i = 0; i < N; i++) {
    const t = Math.round(i * 1000 / FPS);
    await page.evaluate((tt) => window.seek(tt), t);
    await page.screenshot({ path: join(tmp, 'f' + String(i).padStart(4,'0') + '.png') });
  }
  const file = `reel-${idx+1}.mp4`;
  execFileSync(FFMPEG, ['-y','-framerate','30','-i', join(tmp,'f%04d.png'),
    '-c:v','libx264','-crf','18','-preset','slow','-pix_fmt','yuv420p','-movflags','+faststart','-r','30',
    join(OUT, file)], { stdio:'ignore' });
  writeFileSync(join(OUT, `reel-${idx+1}.txt`), item.caption + '\n');
  built.push({ ...item, file });
  console.log(`  ✓ ${file}  (${item.pack} · ${item.tag})`);
}
rmSync(tmp, { recursive:true, force:true });
await browser.close();

// hosted gallery — open on phone, each video + caption + music, save & post
const esc = s => s.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
const cards = built.map((b, i) => `
  <div class="reel">
    <div class="rh"><span class="n">Reel ${i+1}</span><span class="pk" style="color:${b.pk}">${esc(b.pack)}</span>
      <span class="tg ${b.tag.toLowerCase()}">${b.tag}</span></div>
    <video src="${b.file}" controls preload="metadata" playsinline></video>
    <div class="music"><b>🎵 Sound</b> ${esc(b.music)}</div>
    <a class="dl" href="${b.file}" download>⬇ Save video</a>
    <div class="cap" id="cap${i}">${esc(b.caption)}</div>
  </div>`).join('');

const html = `<!DOCTYPE html><html lang="en"><head><meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
<meta name="robots" content="noindex, nofollow" /><title>Dare Night — Reel drop</title>
<meta name="theme-color" content="#0E0E10" />
<style>
  @font-face{font-family:'Bebas Neue';src:url('../fonts/bebas-neue-400.woff2') format('woff2');}
  *{box-sizing:border-box;margin:0;padding:0}
  :root{--bg:#0E0E10;--sf:#17171B;--tx:#F4F1EA;--dim:#A8A6A0;--pink:#FF4D6D;--cyan:#56C2D6;--hair:rgba(255,255,255,.10)}
  body{background:var(--bg);color:var(--tx);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;
    padding:max(18px,env(safe-area-inset-top)) 14px calc(40px + env(safe-area-inset-bottom))}
  .wrap{max-width:560px;margin:0 auto}
  h1{font-family:'Bebas Neue';font-weight:400;font-size:34px;letter-spacing:.5px;margin:6px 0 2px}
  .lede{color:var(--dim);font-size:14px;margin-bottom:16px}
  .lede b{color:var(--tx)}
  .reel{background:var(--sf);border:1px solid var(--hair);border-radius:16px;padding:14px;margin-bottom:18px}
  .rh{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
  .rh .n{font-family:'Bebas Neue';font-size:22px}
  .rh .pk{font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase}
  .tg{margin-left:auto;font-family:'Bebas Neue';font-size:16px;letter-spacing:2px;padding:2px 12px;border-radius:999px}
  .tg.truth{background:var(--cyan);color:#06232a}.tg.dare{background:var(--pink);color:#fff}
  video{width:100%;border-radius:12px;background:#000;display:block;border:1px solid var(--hair)}
  .music{font-size:13px;color:#e9e6df;margin:10px 0 8px}.music b{color:var(--dim);font-weight:700}
  .dl{display:inline-block;font-size:14px;font-weight:700;color:var(--cyan);text-decoration:none;margin-bottom:10px}
  .cap{background:#0c0c0e;border:1px dashed var(--hair);border-radius:10px;padding:11px 12px;font-size:13.5px;color:#e9e6df;white-space:pre-wrap}
  footer{color:var(--dim);font-size:12.5px;margin-top:8px;border-top:1px solid var(--hair);padding-top:14px}
  footer a{color:var(--cyan)}
</style></head><body><div class="wrap">
  <h1>Reel drop — the month (faceless)</h1>
  <div class="lede"><b>${built.length} auto-made Reels</b> — the faceless half of the month. Save each, post to IG + TikTok,
    <b>add the sound in-app</b> (they’re silent so the music isn’t copyright-muted). Long-press a caption to copy.
    <b>Interleave these with your real-people clips</b> (a table reacting, someone acting out a dare) — alternate faceless → real →
    faceless — and post the whole set <b>before the end of August</b>. Full shot list + schedule: the
    <a href="https://dare-night.app/marketing/reel-storyboards.html">reel plan</a>.</div>
  ${cards}
  <footer>Silent by design — add the trending sound on upload. Measured via the dashboard’s “From IG” tile.
    Regenerate / swap prompts: <code>node apps/dare-night/marketing/build-reels.mjs</code>.</footer>
</div></body></html>`;
writeFileSync(join(OUT, 'index.html'), html);
console.log(`\n✅ ${built.length} reels + gallery → apps/dare-night/marketing/reels/  (${readdirSync(OUT).filter(f=>f.endsWith('.mp4')).length} mp4)`);