#!/usr/bin/env node
/* stack-render.mjs — render an acrylic-stack plan to per-plane SVGs.
   usage: node tools/stack-render.mjs <plan.mjs> [outDir]
   Writes plane-NN-<sheet>-<face>.svg + manifest.json for the simulator
   (fable/stack/simulator.html?c=<id>). */
import { mkdirSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { pathToFileURL } from 'node:url';
import { renderStack, planeDepths } from '../src/render/stack.js';

const [planPath, outArg] = process.argv.slice(2);
if (!planPath) { console.error('usage: node tools/stack-render.mjs <plan.mjs> [outDir]'); process.exit(1); }

const plan = (await import(pathToFileURL(resolve(planPath)).href)).default;
const outDir = resolve(outArg || `fable/stack/candidates/${plan.id}`);
mkdirSync(outDir, { recursive: true });

const { planes } = renderStack(plan);
const zmm = planeDepths(plan);

const manifest = {
  id: plan.id, title: plan.title || plan.id, seed: plan.seed,
  geometry: { thickness: plan.geometry?.thickness ?? 3, gap: plan.geometry?.gap ?? 6 },
  planes: [],
};
planes.forEach((p, i) => {
  const file = `plane-${String(i).padStart(2, '0')}-${p.sheet}-${p.face}.svg`;
  writeFileSync(`${outDir}/${file}`, p.svg);
  manifest.planes.push({ file, sheet: p.sheet, face: p.face, zmm: zmm[i], label: p.label });
  console.log(`  ${file}  z=${zmm[i]}mm  ${p.label}`);
});
writeFileSync(`${outDir}/manifest.json`, JSON.stringify(manifest, null, 2));
console.log(`→ ${outDir} (${planes.length} planes)`);