PROCITY/web/js/interiors/interiors.js

// PROCITY Lane C — public API. The Vuntra move: every shop door opens into a unique, believable,
// seeded interior, generated on demand in <50ms, byte-identical every revisit (shop.seed), themed
// by shop.type. This is a standalone library + test page; Lane B wires it to real doors later via
// the procity:enterShop / procity:exitShop events.
//
//   import { buildInterior } from './js/interiors/interiors.js';
//   import * as THREE from 'three';
//   const room = buildInterior(shop, THREE);   // shop = a CityPlan shop record + its lot dims
//   scene.add(room.group);
//   // … player walks around, hits room.exits …
//   room.dispose();                            // frees all per-room geometry/material/textures
//
// buildInterior(shop, THREE, opts?) → {
//   group,                               // THREE.Group, self-contained (lights included). Add to a scene.
//   spawn: { x, z, ry },                 // where/what-heading the player enters at (just inside the door)
//   exits: [ { x, z, w, toStreet } ],    // door(s) back to the street
//   places: [ …meshes with userData ],   // interactables: counter, bins, case, fridge, returns, exit
//   counter: { mesh, pose, stand },      // pay point. stand:{x,z,ry} = where a shopkeeper (Lane D)
//                                        //   stands, in room-local space, facing the customer.
//   dims: { W, D, H, archetype, type },  // room metrics
//   placement,                           // deterministic placement summary (deep-equal per seed)
//   pathOK,                              // door→counter connectivity held (always true; carved if needed)
//   dispose(),                           // release GPU resources; removes group from its parent
// }
//
// `shop` is tolerant. Recognized fields: { id, type, name, seed, storeys, lot:{w,d} }.
//   • seed   : uint32 — the ONLY randomness source (falls back to a hash of id/name if absent)
//   • type   : any CITY_SPEC type or thriftgod alias (see theme.js); defaults to 'opshop'
//   • lot    : { w, d } metres — room adapts to it; if absent, archetype ranges decide the size
//   • storeys: ceiling height driver (1 → 3.2m … up to 4.5m)
// opts: { archetype?: 'cosy'|'gallery'|'wide'|'hall'|'pokey', stockAdapter? }
//
// Registry override (Lane F): call mergeRegistry(registry) ONCE at init to let authored registry data
// override recipe fields. It is deliberately NOT a per-build option — a per-call mutation of the shared
// recipe table would break the same-seed determinism guarantee for every later build.

import { Ctx } from './context.js';
import { getRecipe, mergeRegistry, SHOP_TYPES } from './theme.js';
import { ARCHETYPE_KEYS, chooseArchetype, computeDims, buildShell } from './shell.js';
import { layout } from './layout.js';
import { batchRoom } from './batch.js';
import { preloadManifest, upgradeRoom } from './glb.js';
import { xmur3 } from '../core/prng.js';

export { SHOP_TYPES, ARCHETYPE_KEYS, mergeRegistry };
export { preloadManifest } from './glb.js';   // Lane F: preload once so GLB upgrades apply synchronously

let glbManifest = null;                        // resolved manifest cache (once the depot answers)

function normalizeShop(shop) {
  const s = shop || {};
  let seed = s.seed;
  if (seed == null) seed = xmur3(`${s.id ?? ''}:${s.name ?? ''}:${s.type ?? ''}`)();
  const lot = s.lot && s.lot.w && s.lot.d ? { w: +s.lot.w, d: +s.lot.d }
    : (s.lotW && s.lotD ? { w: +s.lotW, d: +s.lotD } : null);
  return {
    id: s.id ?? 'shop',
    type: s.type ?? 'opshop',
    name: s.name ?? '',
    seed: seed >>> 0,
    storeys: s.storeys ?? 1,
    lot,
    raw: s,
  };
}

export function buildInterior(shop, THREE, opts) {
  opts = opts || {};                 // tolerate undefined AND explicit null
  const t0 = (typeof performance !== 'undefined' ? performance.now() : 0);

  const norm = normalizeShop(shop);
  const recipe = getRecipe(norm.type);
  const ctx = new Ctx(THREE, norm.seed);

  // room shape → dims → shell
  const archetype = chooseArchetype(recipe, ctx.stream('archetype'), opts.archetype);
  const dims = computeDims(ctx, recipe, archetype, norm.lot, norm.storeys);
  const shell = buildShell(ctx, { recipe, archetype, dims });

  // fittings + wall decor + stock + walkable-path guarantee
  const lay = layout(ctx, { recipe, dims, shell, adapter: opts.stockAdapter || null, shop: norm });

  // DRAW BATCHING (round 6, ≤350 draws/room law): merge the many same-material stock/fixture meshes
  // inside each fitting group into a few merged geometries. Fitting groups (and their userData) are
  // kept, so bins stay raycast targets for ?dig=1. Runs BEFORE the GLB upgrade so its frame-hide sees
  // the merged fixture meshes. opts.noBatch disables it (diagnostics only).
  if (!opts.noBatch) batchRoom(ctx, shell.group);

  // OPTIONAL GLB hero-prop upgrade (off by default). Placeholder-persists: primitives stay until (and
  // unless) the depot answers. `opts.useGLB` enables it; the manifest may be preloaded (glb.preloadManifest)
  // or passed as opts.manifest. Never blocks the build; never required for a fully-usable room.
  let glbReady = Promise.resolve();                 // resolves when GLB upgrades settle (immediately if off)
  if (opts.useGLB) {
    const manifest = opts.manifest || (glbManifest && glbManifest.__resolved) || null;
    if (manifest) glbReady = upgradeRoom(ctx, lay.placed, manifest, recipe.key);
    else glbReady = preloadManifest(opts.manifestUrl).then(m => {
      if (m && !ctx._disposed) { glbManifest = { __resolved: m }; return upgradeRoom(ctx, lay.placed, m, recipe.key); }
    });
  }

  const group = shell.group;
  const buildMs = (typeof performance !== 'undefined' ? performance.now() : 0) - t0;

  let disposed = false;
  const api = {
    group,
    spawn: shell.spawn,
    exits: shell.exits,
    places: lay.places,
    counter: lay.counter,              // { mesh, pose:{x,z,ry}, stand:{x,z,ry} } — Lane D keeper spawn pose
    dims: { ...dims, archetype, type: recipe.key },
    recipe: { key: recipe.key, label: recipe.label, counterPos: recipe.counterPos, clutter: recipe.clutter },
    placement: lay.placement,
    pathOK: lay.pathOK,
    carved: lay.carved,
    glbReady,                          // Promise — resolves when opts.useGLB hero-prop swaps have settled
    buildMs,
    _debug: { grid: lay.grid, spawnCell: lay.spawnCell, targetCell: lay.targetCell, ctx },
    counts: () => ctx.counts(),
    dispose() {
      if (disposed) return;
      disposed = true;
      if (group.parent) group.parent.remove(group);
      // drop lights/children refs, then free tracked GPU resources
      ctx.disposeAll();
    },
  };
  return api;
}