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+import * as THREE from 'three';
+
+/**
+ * Hats for ぶるべー. Each hat is a small group of primitives whose base sits at
+ * y = 0, so the app can drop it straight onto the top of the head (see
+ * `hatMount` in src/main.js). The character's front is +z, so a brim or a badge
+ * faces +z.
+ *
+ * These are deliberately not textured: like the props, they are built from a few
+ * rounded primitives so they take a clean outline and read in every render style.
+ */
+
+const material = (color, opts = {}) => new THREE.MeshStandardMaterial({
+  color,
+  roughness: 0.72,
+  metalness: 0,
+  ...opts,
+});
+
+function add(parent, geometry, mat, x = 0, y = 0, z = 0) {
+  const mesh = new THREE.Mesh(geometry, mat);
+  mesh.position.set(x, y, z);
+  mesh.castShadow = true;
+  mesh.receiveShadow = false;
+  parent.add(mesh);
+  return mesh;
+}
+
+const cylinder = (rt, rb, h, seg = 24) => new THREE.CylinderGeometry(rt, rb, h, seg);
+const sphere = (r, w = 24, h = 16, phiStart = 0, phiLength = Math.PI * 2, thetaStart = 0, thetaLength = Math.PI) => (
+  new THREE.SphereGeometry(r, w, h, phiStart, phiLength, thetaStart, thetaLength)
+);
+const box = (w, h, d) => new THREE.BoxGeometry(w, h, d);
+
+/**
+ * The 線画 fill a part takes, as how far it steps from the paper towards the ink
+ * (see `addMesh` in src/styles.js). Every hat part already gets the light default
+ * tone, but two parts of the *same* hat then come out the same shade - so a part
+ * that sits flush on another (a band on a crown) loses its seam. Tagging it with
+ * a darker tone puts that seam back, without touching リアル / フラット, where the
+ * part's own colour already draws it.
+ */
+function tone(mesh, strength) {
+  mesh.userData.tone = strength;
+  return mesh;
+}
+
+/** シルクハット: a tall black crown, a narrow band and a flat brim. */
+function buildSilk() {
+  const group = new THREE.Group();
+  const black = material('#1b1722');
+  const band = material('#3a2f4a');
+  add(group, cylinder(1.52, 1.52, 0.12, 32), black, 0, 0.06, 0);
+  add(group, cylinder(1.00, 1.04, 1.62, 32), black, 0, 0.93, 0);
+  tone(add(group, cylinder(1.05, 1.05, 0.24, 32), band, 0, 0.30, 0), 0.34);
+  return group;
+}
+
+/** キャップ: a baseball cap - a low dome, a rim and a bill at the front. */
+function buildCap() {
+  const group = new THREE.Group();
+  const blue = material('#3f6fd0');
+  const dark = material('#2f54a4');
+  // The crown: a hemisphere whose flat face sits on y = 0.
+  const crown = add(group, sphere(1.08, 28, 18, 0, Math.PI * 2, 0, Math.PI / 2), blue, 0, 0, 0);
+  crown.scale.set(1, 0.92, 1);
+  tone(add(group, cylinder(1.10, 1.10, 0.18, 28), dark, 0, 0.09, 0), 0.30);
+  // The bill, tipped down a little at the front.
+  const bill = tone(add(group, cylinder(0.86, 0.86, 0.09, 24), dark, 0, 0.06, 0.92), 0.30);
+  bill.scale.set(1, 1, 1.25);
+  bill.rotation.x = -0.12;
+  tone(add(group, sphere(0.13, 12, 10), dark, 0, 1.02, 0), 0.30);
+  return group;
+}
+
+/** コック帽: a tall pleated toque - a cylindrical band under a big puffy crown. */
+function buildChef() {
+  const group = new THREE.Group();
+  const white = material('#f7f6f2');
+  const shade = material('#e6e3da');
+  // The band: a tall cylinder that sits on the head.
+  add(group, cylinder(0.86, 0.92, 0.95, 28), white, 0, 0.475, 0);
+  tone(add(group, cylinder(0.90, 0.90, 0.10, 28), shade, 0, 0.90, 0), 0.26);
+  // The crown: a big squashed sphere ringed with lobes, so the top reads as the
+  // classic pleated toque rather than a plain dome.
+  const puff = add(group, sphere(1.24, 26, 20), white, 0, 1.30, 0);
+  puff.scale.set(1, 0.82, 1);
+  for (let i = 0; i < 8; i += 1) {
+    const a = (i / 8) * Math.PI * 2;
+    const lobe = add(group, sphere(0.5, 14, 12), white, Math.cos(a) * 0.92, 1.52, Math.sin(a) * 0.92);
+    lobe.scale.set(1, 0.9, 1);
+  }
+  const top = add(group, sphere(0.62, 16, 12), white, 0, 1.92, 0);
+  top.scale.set(1, 0.78, 1);
+  return group;
+}
+
+/** 消防士の帽子: a red helmet with a brim, a top ridge and a small front badge. */
+function buildFire() {
+  const group = new THREE.Group();
+  const red = material('#c5342f');
+  const dark = material('#8f241f');
+  const gold = material('#f0c24a', { metalness: 0.4, roughness: 0.4 });
+  const dome = add(group, sphere(1.06, 28, 18, 0, Math.PI * 2, 0, Math.PI / 2), red, 0, 0, 0);
+  dome.scale.set(1, 0.95, 1);
+  const brim = tone(add(group, cylinder(1.34, 1.34, 0.12, 28), dark, 0, 0.06, 0.18), 0.28);
+  brim.scale.set(1, 1, 1.1);
+  // The ridge along the top, front to back.
+  const crest = tone(add(group, box(0.16, 0.42, 1.5), dark, 0, 1.02, 0), 0.28);
+  crest.rotation.x = -0.05;
+  tone(add(group, sphere(0.2, 14, 12), gold, 0, 0.62, 1.02), 0.22);
+  return group;
+}
+
+const BUILDERS = {
+  silk: buildSilk,
+  cap: buildCap,
+  chef: buildChef,
+  fire: buildFire,
+};
+
+/** The hats offered in the panel: `none` clears it. */
+export const HAT_LIBRARY = [
+  { id: 'none', label: 'なし' },
+  { id: 'silk', label: 'シルクハット' },
+  { id: 'cap', label: 'キャップ' },
+  { id: 'chef', label: 'コック帽' },
+  { id: 'fire', label: '消防士' },
+];
+
+/** Builds the named hat, or `null` for `none` / an unknown name. */
+export function buildHat(id) {
+  const builder = BUILDERS[id];
+  return builder ? builder() : null;
+}