/* ============================================================
   layering.mjs — the assembled piece: FILM/diffusion (back) + a QFT
   vacuum-carpet DECK (middle, 3 spaced plate sheets) + a BUBBLE-CHAMBER
   event (front), composited as one image (and the literal plexi stack).
   Produces variations into output/layering/.
   Usage: node tools/layering.mjs [size]
   ============================================================ */
import { writeFileSync, mkdirSync } from 'node:fs';
import { carpetSVG } from '../src/qft/carpet.js';
import { generateScene } from '../src/scene/scene.js';
import { renderSVG } from '../src/render/svgVector.js';
import { paramsFromSeed as bcParams } from '../src/scene/params.js';
import { GROUPS, TOGGLES, FIXED } from '../src/ui/controls.js';

const SIZE = +(process.argv[2] || 1500);
const OUT = 'output/layering';
mkdirSync(OUT, { recursive: true });
const u = SIZE / 1000;
const dataUri = (svg) => 'data:image/svg+xml;base64,' + Buffer.from(svg).toString('base64');

// ---- FILM / diffusion: milky clouds (light, soft) the light diffuses through ----
function filmSVG(o = {}) {
  const { seed = 7, freq = 0.0016, octaves = 4, tone = [236, 228, 208], density = 0.55 } = o;
  const t = tone.map(v => (v / 255).toFixed(3));
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${SIZE}" height="${SIZE}" viewBox="0 0 ${SIZE} ${SIZE}">
<defs><filter id="fog" x="0" y="0" width="100%" height="100%">
<feTurbulence type="fractalNoise" baseFrequency="${freq}" numOctaves="${octaves}" seed="${seed}" stitchTiles="stitch" result="n"/>
<feColorMatrix in="n" type="matrix" values="0 0 0 0 ${t[0]} 0 0 0 0 ${t[1]} 0 0 0 0 ${t[2]} 0 0 0 ${density} 0"/>
</filter></defs><rect width="${SIZE}" height="${SIZE}" filter="url(#fog)"/></svg>`;
}
// ---- film GRAIN veil (fine, dark, low opacity) on top ----
function grainSVG(o = {}) {
  const { seed = 19, tone = [38, 32, 26], amount = 0.5 } = o;
  const t = tone.map(v => (v / 255).toFixed(3));
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${SIZE}" height="${SIZE}" viewBox="0 0 ${SIZE} ${SIZE}">
<defs><filter id="g" x="0" y="0" width="100%" height="100%">
<feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="2" seed="${seed}" stitchTiles="stitch" result="n"/>
<feColorMatrix in="n" type="matrix" values="0 0 0 0 ${t[0]} 0 0 0 0 ${t[1]} 0 0 0 0 ${t[2]} 0 0 0 ${amount} 0"/>
</filter></defs><rect width="${SIZE}" height="${SIZE}" filter="url(#g)"/></svg>`;
}
// ---- bubble-chamber event ----
function bcSVG(seed, over = {}, float = false) {
  const p = { ...FIXED, ...bcParams(seed) };
  for (const g of GROUPS) for (const c of g.controls) if (!(c.id in p)) p[c.id] = c.value;
  for (const t of TOGGLES) if (!(t.id in p)) p[t.id] = t.value;
  p.invert = true; p.showHeader = false;
  if (float) p.transparentPaper = true;        // no paper rect → event floats as an object
  Object.assign(p, over);
  const scene = generateScene(p);
  const sh = scene.shock ? { x: scene.shock.x, y: scene.shock.y } : { x: 0, y: 0 };
  return { svg: renderSVG(scene, p, SIZE), sh };  // sh = disk centre (normalized) for anchoring
}

// AGING layer: sparse scratches + dust speckle + foxing/stain blotches. Seeded.
function agingSVG(o = {}) {
  const { seed = 5, scratches = 7, dust = 0.5, foxing = 0.5, tone = [60, 48, 34] } = o;
  const t = tone.map(v => (v / 255).toFixed(3));
  let lcg = (seed * 9301 + 49297) % 233280; const rnd = () => (lcg = (lcg * 9301 + 49297) % 233280) / 233280;
  let lines = '';
  for (let i = 0; i < scratches; i++) {
    const x = rnd() * SIZE, y0 = rnd() * SIZE * 0.4, len = (0.3 + rnd() * 0.6) * SIZE;
    const x2 = x + (rnd() - 0.5) * 40, y2 = y0 + len;
    const op = (0.05 + rnd() * 0.12).toFixed(3), wsc = (0.4 + rnd() * 0.8).toFixed(2);
    lines += `<line x1="${x.toFixed(0)}" y1="${y0.toFixed(0)}" x2="${x2.toFixed(0)}" y2="${y2.toFixed(0)}" stroke="rgb(${tone.join(',')})" stroke-opacity="${op}" stroke-width="${wsc}"/>`;
  }
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${SIZE}" height="${SIZE}" viewBox="0 0 ${SIZE} ${SIZE}">
<defs>
 <filter id="dust" x="0" y="0" width="100%" height="100%"><feTurbulence type="turbulence" baseFrequency="0.5" numOctaves="2" seed="${seed + 5}" stitchTiles="stitch" result="n"/><feColorMatrix in="n" type="matrix" values="0 0 0 0 ${t[0]} 0 0 0 0 ${t[1]} 0 0 0 0 ${t[2]} 0 0 0 ${(dust * 0.5).toFixed(3)} -0.18"/></filter>
 <filter id="fox" x="0" y="0" width="100%" height="100%"><feTurbulence type="fractalNoise" baseFrequency="0.004" numOctaves="3" seed="${seed + 9}" stitchTiles="stitch" result="n"/><feColorMatrix in="n" type="matrix" values="0 0 0 0 0.42 0 0 0 0 0.30 0 0 0 0 0.16 0 0 0 ${(foxing * 0.32).toFixed(3)} -0.12"/></filter>
</defs>
<rect width="${SIZE}" height="${SIZE}" filter="url(#fox)"/>
<rect width="${SIZE}" height="${SIZE}" filter="url(#dust)"/>
${lines}</svg>`;
}

// build a 3-sheet carpet deck for a variation.
// PROGRESSION back→front: thick lines (+ heavy blur in the composite) → fine, crisp.
function deck(c) {
  const base = { mode: 'plate', rows: 46, horizon: c.horizon ?? 0.37, wFar: 0.58, wNear: 0.7,
    overlap: c.overlap ?? 1.7, mound: c.mound ?? 0.35, sat: c.sat ?? 0.58, lightNear: 0.33, lightFar: 0.56, blips: c.blips ?? 1.0 };
  const lerp = (a, b, t) => a + (b - a) * t;
  // per-sheet stroke weights: back coarse, front fine
  const strokes = [{ near: 2.6, far: 1.0 }, { near: 1.6, far: 0.6 }, { near: 1.0, far: 0.38 }];
  return [0, 1, 2].map(i => {
    const t = i / 2;                                  // 0 back → 1 front
    return carpetSVG(SIZE, { ...base, salt: 'field' + i,
      hue: lerp(c.hueBack, c.hueFront, t), hue2: lerp(c.hueBack, c.hueFront, t) + 0.035,
      chaos: lerp((c.chaos ?? 0.6) * 0.8, c.chaos ?? 0.6, t),
      strokeNear: strokes[i].near, strokeFar: strokes[i].far });
  });
}

function compose(v) {
  const film = dataUri(filmSVG(v.film));
  const sheets = deck(v.carpet).map(dataUri);
  const float = !!v.bcFloat;
  const { svg: bcRaw, sh } = bcSVG(v.bcSeed, v.bcOver, float);
  const bc = dataUri(bcRaw);
  const grain = dataUri(grainSVG(v.grain));
  const aging = v.aging ? dataUri(agingSVG(v.aging)) : null;
  const base = v.base || 'rgb(226,219,199)';
  const blend = float ? 'normal' : 'multiply';   // floating event = transparent paper, normal blend

  // BC placement. sunAt:[sx,sy] (frame coords -1..1) anchors on the DISK centre and
  // scales the whole event about it → the sun lands exactly there, never clipped.
  let bcEl;
  if (v.sunAt) {
    const s = v.bcScale ?? 1, scB = (SIZE / 2) * (1 - 0.02);
    const dpx = SIZE / 2 + sh.x * scB, dpy = SIZE / 2 + sh.y * scB;   // disk px in BC canvas
    const fx = SIZE / 2 + v.sunAt[0] * (SIZE / 2), fy = SIZE / 2 + v.sunAt[1] * (SIZE / 2);
    bcEl = `<g transform="translate(${(fx - s * dpx).toFixed(1)} ${(fy - s * dpy).toFixed(1)}) scale(${s})" style="mix-blend-mode:${blend}"><image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${bc}"/></g>`;
  } else {
    const s = v.bcScale ?? 1, dx = (v.bcDx || 0) * SIZE, dy = (v.bcDy || 0) * SIZE;
    const bcW = SIZE * s, bcX = (SIZE - bcW) / 2 + dx, bcY = (SIZE - bcW) / 2 + dy;
    bcEl = `<image x="${bcX.toFixed(0)}" y="${bcY.toFixed(0)}" width="${bcW.toFixed(0)}" height="${bcW.toFixed(0)}" href="${bc}" style="mix-blend-mode:${blend}"/>`;
  }
  const dir = v.dir ? `${OUT}/${v.dir}` : OUT;
  if (v.dir) mkdirSync(dir, { recursive: true });
  const svg = `<svg xmlns="http://www.w3.org/2000/svg" width="${SIZE}" height="${SIZE}" viewBox="0 0 ${SIZE} ${SIZE}">
<defs>
 <filter id="b3" x="-8%" y="-8%" width="116%" height="116%"><feGaussianBlur stdDeviation="${(2.6 * u).toFixed(2)}"/></filter>
 <filter id="b2" x="-6%" y="-6%" width="112%" height="112%"><feGaussianBlur stdDeviation="${(1.1 * u).toFixed(2)}"/></filter>
</defs>
<rect width="${SIZE}" height="${SIZE}" fill="${base}"/>
<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${film}" opacity="0.6"/>
<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${sheets[0]}" filter="url(#b3)" opacity="0.5"/>
<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${sheets[1]}" filter="url(#b2)" opacity="0.72"/>
<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${sheets[2]}" opacity="0.95"/>
${bcEl}
${aging ? `<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${aging}" opacity="${v.agingOpacity ?? 0.6}" style="mix-blend-mode:multiply"/>` : ''}
<image x="0" y="0" width="${SIZE}" height="${SIZE}" href="${grain}" opacity="${v.grainOpacity ?? 0.45}" style="mix-blend-mode:multiply"/>
</svg>`;
  writeFileSync(`${dir}/${v.name}.svg`, svg);
  console.log(`  ${v.dir ? v.dir + '/' : ''}${v.name}  (bc=${v.bcSeed})`);
}

// ============================================================
// Variations — film + carpet + event, ranging mood & "loudness".
// Guiding thesis: calm sea, loud event.
// ============================================================
const VARIATIONS = [
  { name: '01_mono-calm-sea', base: 'rgb(228,221,201)',
    film: { seed: 3, density: 0.5, tone: [236, 228, 208] }, grain: { amount: 0.4 },
    carpet: { hueBack: 0.58, hueFront: 0.50, chaos: 0.35, blips: 0.7, mound: 0.32 },
    bcSeed: 'LAMBDA-2648', bcOver: { palette: 'mono' } },

  { name: '02_magenta-over-teal', base: 'rgb(228,221,201)',
    film: { seed: 8, density: 0.5 }, grain: { amount: 0.4 },
    carpet: { hueBack: 0.54, hueFront: 0.47, chaos: 0.45, blips: 1.0, mound: 0.35 },
    bcSeed: 'MESON-5113', bcOver: { palette: 'magentarise', saturation: 1.05 } },

  { name: '03_quiet-vast', base: 'rgb(230,224,206)',
    film: { seed: 12, density: 0.42, tone: [238, 231, 212] }, grain: { amount: 0.32 },
    carpet: { hueBack: 0.57, hueFront: 0.52, chaos: 0.22, blips: 0.5, mound: 0.28, overlap: 1.5 },
    bcSeed: 'NUCLEON-2131', bcOver: { palette: 'mono', primaries: 7, burst: 0.4, cosmics: 2, deltaRate: 0.45 } },

  { name: '04_kind-verdigris', base: 'rgb(226,221,205)',
    film: { seed: 21, density: 0.5 }, grain: { amount: 0.4 },
    carpet: { hueBack: 0.45, hueFront: 0.40, chaos: 0.5, blips: 1.1, sat: 0.42, mound: 0.35 },
    bcSeed: 'HYPERON-8444', bcOver: { palette: 'kind', saturation: 1.0 } },

  { name: '05_ember-warm', base: 'rgb(230,222,202)',
    film: { seed: 30, density: 0.52, tone: [238, 226, 204] }, grain: { amount: 0.42 },
    carpet: { hueBack: 0.10, hueFront: 0.07, chaos: 0.5, blips: 1.0, sat: 0.5, mound: 0.34 },
    bcSeed: 'CASCADE-2755', bcOver: { palette: 'kindrise', saturation: 1.0 } },

  { name: '06_seethe-bold', base: 'rgb(227,220,200)',
    film: { seed: 41, density: 0.55 }, grain: { amount: 0.46 },
    carpet: { hueBack: 0.55, hueFront: 0.47, chaos: 0.8, blips: 1.4, mound: 0.4, overlap: 1.9 },
    bcSeed: 'MESON-5113', bcOver: { palette: 'magentarise', saturation: 1.08 } },
];

console.log(`Layered piece — ${VARIATIONS.length} variations → ${OUT}/`);
for (const v of VARIATIONS) compose(v);

// ============================================================
// COMPOSITION study — fixed magenta/teal deck (the 02 look), only the
// BC event's COMPOSITION changes: vertex placement (eventX/Y), disk height
// (shockY), and placement in frame (bcScale/bcDy). Same palette / density /
// arc / disk style throughout. Chasing "sunrise over a vast ocean".
// ============================================================
const TEAL = { hueBack: 0.54, hueFront: 0.47, chaos: 0.42, blips: 1.0, mound: 0.35 };
const tealFilm = { seed: 8, density: 0.5 }, tealGrain = { amount: 0.4 };
// place the SUN (disk) and the event VERTEX together so tracks radiate from it
const sun = (name, px, py) => ({
  name, dir: 'composition', base: 'rgb(228,221,201)', film: tealFilm, grain: tealGrain, carpet: TEAL,
  bcSeed: 'MESON-5113',
  bcOver: { palette: 'magentarise', saturation: 1.05, shockX: px, shockY: py, eventX: px, eventY: py * 0.9 },
});
const COMPOSITION = [
  sun('01_sunrise-on-horizon', 0,     -0.26),   // sun resting on the horizon, rays up
  sun('02_sun-low-in-sea',     0,      0.46),   // low in the water — reflected/setting
  sun('03_high-sun-vast',      0,     -0.5),    // small high sun, vast sea below
  sun('04_offset-left',       -0.46,  -0.12),
  sun('05_offset-right-rise',  0.44,  -0.06),
  sun('06_centered',           0,      0.0),
  sun('07_low-corner-sun',     0.42,   0.34),   // rising in the lower-right
  sun('08_corner-dawn-left',  -0.5,    0.28),   // rising in the lower-left
];
console.log(`BC composition study — ${COMPOSITION.length} → ${OUT}/composition/`);
for (const v of COMPOSITION) compose(v);
{
  const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
  writeFileSync(`${OUT}/composition/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${COMPOSITION.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
}

// VAST — the floating event (transparent paper) shrunk + placed into a huge sea,
// so the sun is small and the ocean is vast. The event stays CENTRED in its own
// canvas (never clipped); (sx,sy) is its target position in the FINAL frame
// (-1..1), reached by translating the scaled image: bcD = s/2.
const vast = (name, sx, sy, scale) => ({
  name, dir: 'vast', base: 'rgb(229,222,203)', film: tealFilm, grain: tealGrain, carpet: TEAL,
  bcSeed: 'MESON-5113', bcFloat: true, bcScale: scale, bcDx: sx / 2, bcDy: sy / 2,
  bcOver: { palette: 'magentarise', saturation: 1.05, shockX: 0, shockY: 0, eventX: 0, eventY: 0 },
});
const VAST = [
  vast('01_distant-dawn',       0,    -0.26, 0.6),    // sun on the horizon
  vast('02_small-sun-horizon',  0,    -0.26, 0.5),
  vast('03_corner-rise-left',  -0.42,  0.02, 0.55),
  vast('04_high-lonely',        0.14, -0.5,  0.42),   // tiny sun high, immense sea
  vast('05_mid-sea-jewel',      0,    -0.04, 0.7),
  vast('06_low-wide-sea',       0,     0.22, 0.62),
];
console.log(`VAST (floating sun) — ${VAST.length} → ${OUT}/vast/`);
for (const v of VAST) compose(v);

// ============================================================
// VAST02 — small sun (≈04 disk size) but LARGER bubble traces; ripple-forward
// calm sea; now WITH film grain + an aging layer (scratches/dust/foxing).
// Disk anchored via sunAt (never clips). shockSize small + bcScale big → small
// disk, big traces. Each iteration varies the trace character.
// ============================================================
const RIPPLE = { hueBack: 0.54, hueFront: 0.47, chaos: 0.32, blips: 0.7, mound: 0.3, overlap: 1.55 };
const v2 = (name, sunAt, bcOver, scale = 0.78) => ({
  name, dir: 'vast02', base: 'rgb(229,222,203)', film: { seed: 8, density: 0.5 },
  grain: { amount: 0.42 }, aging: { seed: (name.charCodeAt(3) * 7) % 97, scratches: 6, dust: 0.5, foxing: 0.55 }, agingOpacity: 0.6,
  carpet: RIPPLE, bcSeed: 'MESON-5113', bcFloat: true, bcScale: scale, sunAt,
  bcOver: { palette: 'magentarise', saturation: 1.05, shockX: 0, shockY: 0, eventX: 0, eventY: 0, shockSize: 0.16, ...bcOver },
});
const VAST02 = [
  v2('01_dawn-sweeping-arcs',   [0, -0.26],    { sweepers: 6, primaries: 18, eloss: 0.34, pspread: 0.8 }),
  v2('02_high-lonely-long',     [0.1, -0.5],   { bfield: 0.7, eloss: 0.3, primaries: 16, cosmics: 7 }, 0.72),
  v2('03_corner-left-bigarcs',  [-0.4, -0.04], { sweepers: 7, primaries: 17, bfield: 0.9 }),
  v2('04_low-wide-spirals',     [0, 0.2],      { deltaRate: 0.85, deltaTight: 0.5, primaries: 20, eloss: 0.4 }),
  v2('05_mid-jewel-dense',      [0, -0.05],    { primaries: 24, burst: 0.82, pspread: 0.9 }, 0.74),
  v2('06_right-rise-curl',      [0.4, -0.06],  { bfield: 1.7, primaries: 18, deltaRate: 0.7 }),
  v2('07_centered-long-reach',  [0, 0.0],      { eloss: 0.28, pspread: 0.95, primaries: 16, shockSize: 0.15 }),
  v2('08_distant-tiny-vast',    [0.06, -0.42], { primaries: 18, sweepers: 5, eloss: 0.34 }, 0.6),
  v2('09_dawn-cosmic-streaks',  [-0.14, -0.2], { cosmics: 9, primaries: 15, bfield: 0.8, eloss: 0.3 }),
  v2('10_horizon-symmetry',     [0, -0.24],    { sweepers: 4, primaries: 19, deltaRate: 0.7, shockSize: 0.17 }),
];
console.log(`VAST02 (small sun, big traces, grain+aging) — ${VAST02.length} → ${OUT}/vast02/`);
for (const v of VAST02) compose(v);
{
  const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
  writeFileSync(`${OUT}/vast02/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${VAST02.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
}

// ============================================================
// VAST03 — an "archive of dawns": vary SUN COLOUR (diskHue/diskSat) + slight
// SIZE, keep larger bubble traces, and bring back the ANNOTATING HAND
// (grease-pencil ring/№/angle via `annotate`; a faint réseau on a couple).
// Trace family stays magenta → a two-colour relationship against each sun.
// ============================================================
const v3 = (name, sunAt, sun, traces, ann, scale = 0.78) => ({
  name, dir: 'vast03', base: 'rgb(229,222,203)', film: { seed: 8, density: 0.5 },
  grain: { amount: 0.4 }, aging: { seed: (name.charCodeAt(2) * 7) % 97, scratches: 6, dust: 0.5, foxing: 0.55 }, agingOpacity: 0.58,
  carpet: RIPPLE, bcSeed: 'MESON-5113', bcFloat: true, bcScale: scale, sunAt,
  bcOver: {
    palette: 'magentarise', saturation: 1.05, shockX: 0, shockY: 0, eventX: 0, eventY: 0,
    diskHue: sun.h, diskSat: sun.s, shockSize: sun.size,
    annotate: ann.a, reseau: ann.r || 0,
    ...traces,
  },
});
const VAST03 = [
  v3('01_burnt-orange-studied', [0, -0.25],   { h: 0.06, s: 0.82, size: 0.16 }, { sweepers: 6, primaries: 18, eloss: 0.34 }, { a: 0.9 }),
  v3('02_gold-sun-light-ring',  [0.08, -0.42],{ h: 0.11, s: 0.85, size: 0.15 }, { primaries: 17, eloss: 0.3, cosmics: 6 },   { a: 0.6 }, 0.74),
  v3('03_amber-reseau',         [0, -0.1],    { h: 0.085, s: 0.9, size: 0.17 }, { primaries: 20, sweepers: 5 },              { a: 0.7, r: 0.32 }),
  v3('04_coral-red-spirals',    [-0.1, 0.12], { h: 0.02, s: 0.85, size: 0.16 }, { deltaRate: 0.85, deltaTight: 0.5, primaries: 20 }, { a: 0.8 }),
  v3('05_rose-pink-dawn',       [0.36, -0.06],{ h: 0.95, s: 0.7, size: 0.15 },  { bfield: 1.4, primaries: 18 },              { a: 0.7 }),
  v3('06_copper-long-reach',    [0, 0.0],     { h: 0.05, s: 0.72, size: 0.18 }, { eloss: 0.28, pspread: 0.95, primaries: 16 }, { a: 0.65 }),
  v3('07_pale-white-hot',       [0.05, -0.5], { h: 0.1, s: 0.22, size: 0.14 },  { primaries: 16, sweepers: 5, eloss: 0.32 }, { a: 0.55 }, 0.7),
  v3('08_cool-teal-sun',        [-0.4, -0.04],{ h: 0.5, s: 0.6, size: 0.16 },   { sweepers: 7, primaries: 17 },             { a: 0.7 }),
  v3('09_magenta-monochrome',   [0, -0.24],   { h: 0.9, s: 0.78, size: 0.17 },  { primaries: 19, deltaRate: 0.7, sweepers: 4 }, { a: 0.8, r: 0.28 }),
  v3('10_deep-ember-studied',   [0.12, 0.18], { h: 0.0, s: 0.9, size: 0.19 },   { primaries: 22, burst: 0.82, eloss: 0.36 }, { a: 1.0 }, 0.76),
];
console.log(`VAST03 (archive of dawns: sun colour + annotation) — ${VAST03.length} → ${OUT}/vast03/`);
for (const v of VAST03) compose(v);
{
  const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
  writeFileSync(`${OUT}/vast03/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${VAST03.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
}

// ============================================================
// VAST04 — refined annotation: ONLY "No 001" + an arrow (no ring, no scrawl),
// THIN white pencil; the particle-collision VERTEX is OFFSET from the disk
// (eventX/Y ≠ shock); the disk gets colour + PRESSURE variation (dark dense
// core). Larger traces continue. Two graphite-pencil controls for comparison.
// ============================================================
const v4 = (name, sunAt, sun, ev, traces, pencil = '#f6f2ea', scale = 0.78) => ({
  name, dir: 'vast04', base: 'rgb(229,222,203)', film: { seed: 8, density: 0.5 },
  grain: { amount: 0.4 }, aging: { seed: (name.charCodeAt(2) * 7) % 97, scratches: 5, dust: 0.45, foxing: 0.5 }, agingOpacity: 0.55,
  carpet: RIPPLE, bcSeed: 'MESON-5113', bcFloat: true, bcScale: scale, sunAt,
  bcOver: {
    palette: 'magentarise', saturation: 1.05,
    shockX: 0, shockY: 0, eventX: ev[0], eventY: ev[1],     // collision offset from the disk
    diskHue: sun.h, diskSat: sun.s, shockSize: sun.size, diskPressure: sun.p,
    annotate: 0.5, annoRing: false, annoExtras: false, annoArrow: true, annoNum: true,
    annoLabel: 'No 001', annoWidth: 0.4, annotateInk: pencil,
    ...traces,
  },
});
const VAST04 = [
  v4('01_burnt-orange-pressure', [0, -0.25],   { h: 0.06, s: 0.82, size: 0.16, p: 0.85 }, [0.26, -0.14], { sweepers: 6, primaries: 18, eloss: 0.34 }),
  v4('02_gold-mid-pressure',     [0.08, -0.42], { h: 0.11, s: 0.85, size: 0.15, p: 0.5 },  [-0.2, 0.16],  { primaries: 17, eloss: 0.3, cosmics: 6 }, '#f6f2ea', 0.74),
  v4('03_amber-soft-core',       [0, -0.1],     { h: 0.085, s: 0.9, size: 0.17, p: 0.25 }, [0.28, 0.12],  { primaries: 20, sweepers: 5 }),
  v4('04_coral-deep-core',       [-0.1, 0.12],  { h: 0.02, s: 0.85, size: 0.16, p: 0.8 },  [0.22, -0.18], { deltaRate: 0.85, deltaTight: 0.5, primaries: 20 }),
  v4('05_copper-pressure',       [0.36, -0.06], { h: 0.05, s: 0.72, size: 0.16, p: 0.55 }, [-0.24, -0.1], { bfield: 1.4, primaries: 18 }),
  v4('06_deep-ember-densecore',  [0, -0.24],    { h: 0.0, s: 0.9, size: 0.18, p: 0.95 },   [0.2, 0.18],   { primaries: 19, sweepers: 4 }),
  v4('07_rose-mid',              [0.05, -0.5],  { h: 0.95, s: 0.7, size: 0.15, p: 0.5 },    [-0.18, 0.2],  { primaries: 16, eloss: 0.3, cosmics: 5 }, '#f6f2ea', 0.7),
  v4('08_magenta-pressure',      [0, 0.0],      { h: 0.9, s: 0.78, size: 0.17, p: 0.7 },    [0.3, -0.1],   { eloss: 0.28, pspread: 0.95, primaries: 16 }),
  v4('09_graphite-on-orange',    [-0.4, -0.04], { h: 0.06, s: 0.82, size: 0.16, p: 0.8 },   [0.24, 0.14],  { sweepers: 7, primaries: 17 }, '#39312a'),
  v4('10_graphite-on-ember',     [0.12, 0.18],  { h: 0.0, s: 0.9, size: 0.19, p: 0.9 },     [-0.22, -0.16],{ primaries: 22, burst: 0.82 }, '#39312a', 0.76),
];
console.log(`VAST04 (No001 + arrow, white pencil, vertex offset, disk pressure) — ${VAST04.length} → ${OUT}/vast04/`);
for (const v of VAST04) compose(v);
{
  const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
  writeFileSync(`${OUT}/vast04/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${VAST04.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
}
{
  const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
  writeFileSync(`${OUT}/vast/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${VAST.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
}

const cap = (v) => v.name.replace(/^\d+_/, '').replace(/-/g, ' ');
writeFileSync(`${OUT}/index.html`, `<!DOCTYPE html><html><head><meta charset="utf-8"><title>Layered piece · film + QFT carpet + bubble chamber</title>
<style>body{margin:0;background:#0b0b0b;color:#bbb;font:12px/1.5 ui-monospace,Menlo,monospace;padding:26px;max-width:1900px}
h1{font-weight:400;letter-spacing:.22em;text-transform:uppercase;font-size:13px;color:#a5d4c9}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(460px,1fr));gap:20px;margin-top:18px}
figure{margin:0;background:#fff;border:1px solid #262626;overflow:hidden}img{width:100%;display:block}
figcaption{padding:8px 10px;color:#e8e4d8;background:#111}small{color:#777;display:block}
.notes{color:#999;background:#0e1816;padding:14px 18px;border-left:3px solid #a5d4c9;margin:18px 0}</style></head><body>
<h1>Layered piece — film · QFT vacuum carpet · bubble-chamber event</h1>
<div class="notes">back→front: cream ground · milky film/diffusion · 3 spaced QFT carpet sheets (back two blurred = air-gap depth of field) · bubble-chamber event (multiply) · film grain. The literal plexi stack, previewed as one image.</div>
<div class=grid>${VARIATIONS.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}<small>${v.bcSeed} · ${v.bcOver?.palette || 'mono'}</small></figcaption></figure>`).join('\n')}</div></body></html>`);
writeFileSync(`${OUT}/m.html`, `<!DOCTYPE html><html><head><meta charset="utf-8">
<style>html,body{margin:0;background:#222}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:10px;width:2400px}figure{margin:0;position:relative;background:#fff;overflow:hidden}img{width:100%;display:block}figcaption{position:absolute;left:0;bottom:0;right:0;padding:6px 10px;font:14px ui-monospace,monospace;color:#fff;background:linear-gradient(transparent,#000d)}</style></head><body>
<div class="grid">${VARIATIONS.map(v => `<figure><img src="${v.name}.svg"><figcaption>${cap(v)}</figcaption></figure>`).join('')}</div></body></html>`);
console.log(`contact sheets -> ${OUT}/index.html , m.html`);