// PROCITY Lane C — visual stock (v1). Fills the fittings' `slots` with product silhouettes:
// canvas-texture cardboard sleeves / spines / boxes / snacks / magazines with price stickers
// (the dig.js sleeve trick — coloured cardboard + sticker). Real item data is the content phase;
// this stays purely cosmetic and byte-identical per seed.
//
//   stock.fill(ctx, fitting, { shop, recipe, stockKind, adapter }, r)
//     iterates fitting.slots and adds child meshes into fitting.group.
//
// stockAdapter hook (content phase): `adapter(shop, slotKind) => { texture } | { mesh } | null`.
// If it returns a texture, that texture skins the item face; a mesh replaces the item entirely;
// null (default) → procedural placeholder. BaseGod / GODVERSE data plugs in here without touching
// layout or fittings code.
//
// PERF + LEAK SAFETY: face textures are POOLED per room (a small seeded set reused across many
// items) → few CanvasTextures to build and dispose, fast builds, soak returns to baseline.

import { pick } from './context.js';
import { realSleeveMesh, buildBuyableShelf } from './stockpack.js';

// Muted 90s stock palette (cardboard, plastic, faded card).
const CARD = ['#b49b72', '#a6b472', '#72a6b4', '#b47298', '#8a72b4', '#b48a72', '#72b48a', '#b4a672'];
const SPINE = ['#7a2a2a', '#2a4a7a', '#2a6a4a', '#7a5a2a', '#5a2a6a', '#2a5a6a', '#6a6a2a', '#7a3a5a'];
const SNACK = ['#e04a3a', '#f0b428', '#3a9ae0', '#4ac04a', '#e04a9a', '#f07028', '#a04ae0'];

// ── per-room face-texture pool ──────────────────────────────────────────────────────
// A pooled canvas "face" for a stock kind: coloured card + a little price sticker + label bars.
function makeFace(ctx, kind, r) {
  const cv = document.createElement('canvas');
  cv.width = 64; cv.height = kind === 'spine' ? 128 : 64;
  const x = cv.getContext('2d');
  const pal = kind === 'spine' ? SPINE : kind === 'snack' ? SNACK : CARD;
  const base = pick(r, pal);
  x.fillStyle = base; x.fillRect(0, 0, cv.width, cv.height);
  // faded border
  x.strokeStyle = 'rgba(0,0,0,0.18)'; x.lineWidth = 3; x.strokeRect(2, 2, cv.width - 4, cv.height - 4);
  if (kind === 'spine') {
    // title bars down the spine
    x.fillStyle = 'rgba(255,255,255,0.82)';
    for (let i = 0; i < 3; i++) x.fillRect(10, 18 + i * 30 + (r() * 6 | 0), cv.width - 20, 8);
    x.fillStyle = 'rgba(0,0,0,0.3)'; x.fillRect(8, cv.height - 20, cv.width - 16, 10);
  } else {
    // a cover blob + label lines
    x.fillStyle = 'rgba(255,255,255,0.16)';
    x.beginPath(); x.arc(32 + (r() - 0.5) * 16, 26, 12 + r() * 6, 0, 6.3); x.fill();
    x.fillStyle = 'rgba(255,255,255,0.75)';
    x.fillRect(8, 44, 34, 5); x.fillRect(8, 52, 22, 4);
  }
  // the op-shop price sticker — a fluoro dot with a $ scrawl
  const sx = cv.width - 18, sy = 14;
  x.fillStyle = '#f4e11a'; x.beginPath(); x.arc(sx, sy, 9, 0, 6.3); x.fill();
  x.fillStyle = '#c1121f'; x.font = 'bold 11px Arial'; x.textAlign = 'center'; x.textBaseline = 'middle';
  x.fillText('$' + (1 + (r() * 9 | 0)), sx, sy + 1);
  return ctx.canvasTexture(cv);
}

function facePool(ctx, kind, r, n = 6) {
  const key = `_facePool_${kind}`;
  if (!ctx[key]) { ctx[key] = []; for (let i = 0; i < n; i++) ctx[key].push(makeFace(ctx, kind, r)); }
  return ctx[key];
}

// A garment silhouette (ported from 90sDJsim garmentCanvas), pooled per room.
const GARMENTS = ['tee', 'hoodie', 'jacket', 'dress', 'pants', 'shirt'];
function makeGarment(ctx, r) {
  const shape = GARMENTS[(r() * GARMENTS.length) | 0];
  const color = new ctx.THREE.Color().setHSL(r(), 0.45, 0.4 + r() * 0.2);
  const cv = document.createElement('canvas'); cv.width = 128; cv.height = 160;
  const x = cv.getContext('2d');
  const col = '#' + color.getHexString();
  const dark = '#' + color.clone().offsetHSL(0, 0.05, -0.14).getHexString();
  x.fillStyle = col; x.strokeStyle = dark; x.lineWidth = 4; x.lineJoin = 'round';
  const P = pts => { x.beginPath(); x.moveTo(pts[0][0], pts[0][1]); for (let i = 1; i < pts.length; i++) x.lineTo(pts[i][0], pts[i][1]); x.closePath(); x.fill(); x.stroke(); };
  if (shape === 'pants') P([[40, 8], [88, 8], [90, 152], [70, 152], [64, 62], [58, 152], [38, 152]]);
  else if (shape === 'dress') { P([[48, 20], [80, 20], [104, 152], [24, 152]]); x.fillStyle = dark; x.beginPath(); x.ellipse(64, 22, 11, 6, 0, 0, 6.3); x.fill(); }
  else {
    P([[16, 46], [46, 26], [46, 60], [22, 78]]); P([[112, 46], [82, 26], [82, 60], [106, 78]]);
    P([[42, 24], [86, 24], [86, 142], [42, 142]]);
    x.fillStyle = dark; x.beginPath(); x.ellipse(64, 26, 12, 7, 0, 0, 6.3); x.fill();
    if (shape === 'hoodie') { x.fillStyle = col; x.beginPath(); x.arc(64, 24, 15, Math.PI, 0); x.fill(); x.stroke(); }
  }
  x.fillStyle = 'rgba(255,255,255,0.22)'; x.fillRect(55, 62, 18, 20);
  return ctx.canvasTexture(cv);
}
function garmentPool(ctx, r, n = 8) {
  if (!ctx._garmentPool) { ctx._garmentPool = []; for (let i = 0; i < n; i++) ctx._garmentPool.push(makeGarment(ctx, r)); }
  return ctx._garmentPool;
}

// ── fill entry point ─────────────────────────────────────────────────────────────────
export function fill(ctx, fitting, opts, r) {
  for (const slot of fitting.slots || []) fillSlot(ctx, fitting.group, slot, opts, r);
}

function fillSlot(ctx, parent, slot, opts, r) {
  switch (slot.kind) {
    case 'sleeve':   return binFan(ctx, parent, slot, opts, r);
    case 'garment':  return hang(ctx, parent, slot, opts, r);
    case 'treasure': return treasures(ctx, parent, slot, opts, r);
    default:         return shelfLine(ctx, parent, slot, opts, r);   // box / spine / snack / magazine
  }
}

// Ask the adapter for a face texture (content phase); null → pooled procedural face.
function faceTex(ctx, kind, opts, r) {
  if (opts.adapter) {
    const got = opts.adapter(opts.shop, kind);
    if (got && got.texture) return got.texture;
  }
  return pick(r, facePool(ctx, kind === 'magazine' ? 'card' : kind, r));
}

// Packed leaning sleeves in a bin/crate; front few wear covers (dig.js look). With ?stock=real the
// adapter hands back a pack pool → every sleeve is a real cover PLANE sampling the shared atlas (batches
// to one draw); otherwise procedural cardboard.
function binFan(ctx, parent, slot, opts, r) {
  const n = slot.count || 12;
  const fw = slot.faceW || 0.3, h = slot.height || 0.3, run = slot.run || 0.5, tilt = slot.tilt ?? -0.4;
  const step = run / Math.max(1, n);
  const src = opts.adapter && opts.adapter(opts.shop, 'sleeve');
  const pack = src && src.real ? src.pack : null;
  const pool = pack ? null : facePool(ctx, 'card', r);
  for (let i = 0; i < n; i++) {
    const z = -run / 2 + (i + 0.5) * step;
    let sl;
    if (pack) {
      sl = realSleeveMesh(ctx, pack, pick(r, pack.items), fw, h);   // isStock + shared atlas material
      sl.position.set(slot.x + (r() - 0.5) * 0.02, slot.y + h / 2, slot.z + z);
      parent.add(sl);
    } else {
      const front = i >= n - 4;                     // front sleeves show a cover
      const faceMat = front ? ctx.mat('#ffffff', 0.7) : ctx.mat(pick(r, CARD), 0.85);
      if (front) { faceMat.map = pick(r, pool); faceMat.color.set('#ffffff'); faceMat.needsUpdate = true; }
      sl = ctx.box(fw, h, 0.012, faceMat, slot.x + (r() - 0.5) * 0.02, slot.y + h / 2, slot.z + z, parent);
      sl.userData.isStock = true;
    }
    sl.rotation.x = tilt + (r() - 0.5) * 0.05;
    sl.rotation.z = (r() - 0.5) * 0.04;
  }
}

// Neat row along local X. Handles box (upright), spine (edge-out), snack (small), magazine (leaning).
function shelfLine(ctx, parent, slot, opts, r) {
  const kind = slot.kind;
  const run = slot.run || 0.8, depth = slot.depth || 0.3, clear = slot.height || 0.3;
  const scatter = slot.scatter;
  const n = Math.max(1, slot.count || 4);
  const pool = kind === 'spine' ? facePool(ctx, 'spine', r) : facePool(ctx, kind === 'snack' ? 'snack' : 'card', r);
  // ?stock=real: book spines / toy boxes pull real covers from the pack (shared atlas material → batched).
  const src = !scatter && opts.adapter && opts.adapter(opts.shop, kind);
  const pack = src && src.real ? src.pack : null;

  if (scatter) {                                     // tables / pegboards: random small goods
    for (let i = 0; i < n; i++) {
      const s = 0.09 + r() * 0.11;
      const m = ctx.mat(pick(r, CARD), 0.85);
      if (r() < 0.5) { m.map = pick(r, pool); m.color.set('#ffffff'); m.needsUpdate = true; }
      const b = ctx.box(s, slot.wall ? s * 1.4 : s, slot.wall ? 0.03 : s, m,
        slot.x + (r() - 0.5) * (run - s), slot.y + (slot.wall ? (r() - 0.5) * (clear - s) : s / 2),
        slot.z + (slot.wall ? 0.03 : (r() - 0.5) * (depth - s)), parent);
      b.rotation.y = (r() - 0.5) * 0.6;
      b.userData.isStock = true;
    }
    return;
  }

  if (kind === 'spine') {                            // books / VHS: thin spines edge-out
    const step = (run - 0.04) / n;
    if (pack) {                                      // real book spines → one buyable, addressable mesh
      const poolItems = pack.atlasPool(r);           // single atlas → the whole slot merges to one draw
      const pls = [];
      for (let i = 0; i < n; i++) {
        const bh = clear * (0.8 + r() * 0.2);
        const x = slot.x - run / 2 + (i + 0.5) * step;
        const rz = (slot.lean && i > n - 3) ? 0.18 : 0;
        pls.push({ item: pick(r, poolItems), x, y: slot.y + bh / 2, z: slot.z + depth / 2 - 0.01, w: step * 0.86, h: bh, rz });
      }
      const meshes = buildBuyableShelf(ctx, pack, pls);
      if (meshes.length) { for (const m of meshes) parent.add(m); return; }   // else fall through, fail-soft
    }
    for (let i = 0; i < n; i++) {                     // procedural spines (no pack / merge failed)
      const bh = clear * (0.8 + r() * 0.2);
      const x = slot.x - run / 2 + (i + 0.5) * step;
      const m = ctx.mat('#ffffff', 0.7); m.map = pick(r, pool); m.color.set('#ffffff'); m.needsUpdate = true;
      const b = ctx.box(step * 0.86, bh, depth, m, x, slot.y + bh / 2, slot.z, parent);
      b.userData.isStock = true;
      if (slot.lean && i > n - 3) b.rotation.z = 0.18;   // a couple flopped over
    }
    return;
  }

  if (kind === 'magazine') {                         // leaning mag faces
    const step = run / n;
    for (let i = 0; i < n; i++) {
      const m = ctx.mat('#ffffff', 0.7); m.map = pick(r, pool); m.color.set('#ffffff'); m.needsUpdate = true;
      const b = ctx.box(step * 0.9, clear * 0.9, 0.01, m, slot.x - run / 2 + (i + 0.5) * step, slot.y + clear * 0.45, slot.z, parent);
      b.rotation.x = slot.tilt ?? -0.35;
      b.userData.isStock = true;
    }
    return;
  }

  // default 'box' / 'snack': upright cartons in a row, faces forward (+Z).
  // SINGLE material (cover on all faces) so the whole run merges to one draw in batch.js — a
  // multi-material box cost one draw PER face (6×), the biggest draw-count offender pre-round-6.
  const bw = Math.min((run - 0.02) / n, kind === 'snack' ? 0.12 : 0.28);
  const step = run / n;
  if (pack) {                                        // real toy boxes → one buyable, addressable mesh
    const poolItems = pack.atlasPool(r);             // single atlas → the whole slot merges to one draw
    const pls = [];
    for (let i = 0; i < n; i++) {
      const bh = clear * (kind === 'snack' ? 0.6 : 0.62 + r() * 0.28);
      const x = slot.x - run / 2 + (i + 0.5) * step;
      pls.push({ item: pick(r, poolItems), x, y: slot.y + bh / 2, z: slot.z + depth / 2 - 0.01, w: bw * 0.88, h: bh });
    }
    const meshes = buildBuyableShelf(ctx, pack, pls);
    if (meshes.length) { for (const m of meshes) parent.add(m); return; }     // else fall through, fail-soft
  }
  for (let i = 0; i < n; i++) {                       // procedural cartons (no pack / merge failed)
    const bh = clear * (kind === 'snack' ? 0.6 : 0.62 + r() * 0.28);
    const bd = Math.min(depth, kind === 'snack' ? 0.1 : 0.26);
    const x = slot.x - run / 2 + (i + 0.5) * step;
    const m = ctx.mat('#ffffff', 0.8);
    m.map = faceTex(ctx, kind, opts, r); m.color.set('#ffffff'); m.needsUpdate = true;
    const mesh = ctx.box(bw * 0.88, bh, bd, m, x, slot.y + bh / 2, slot.z + depth / 2 - bd / 2 - 0.01, parent);
    mesh.userData.isStock = true;
  }
}

// Garments hung along a rail.
function hang(ctx, parent, slot, opts, r) {
  const n = slot.count || 10, run = slot.run || 1.4, h = slot.height || 0.52;
  const pool = garmentPool(ctx, r);
  for (let i = 0; i < n; i++) {
    const gx = slot.x - run / 2 + (run) * (i / (n - 1 || 1));
    const m = ctx.mat('#ffffff', 0.92, { transparent: true, alphaTest: 0.4, side: ctx.THREE.DoubleSide });
    m.map = pick(r, pool); m.color.set('#ffffff'); m.needsUpdate = true;
    const g = ctx.planeGeo(0.34, h);
    const p = new ctx.THREE.Mesh(g, m);
    p.position.set(gx, slot.y - 0.05 - h / 2, slot.z + (r() - 0.5) * 0.03);
    p.rotation.y = (r() - 0.5) * 0.15;
    p.userData.isStock = true;
    parent.add(p);
  }
}

// Small treasures on a glass-case shelf.
function treasures(ctx, parent, slot, opts, r) {
  const n = slot.count || 4, run = slot.run || 1.0;
  const cols = ['#c8a13a', '#b0b0b8', '#8a5a3a', '#3a6a8a', '#8a3a5a'];
  for (let i = 0; i < n; i++) {
    const s = 0.06 + r() * 0.06;
    const b = ctx.box(s * (1 + r()), s, s, ctx.mat(pick(r, cols), 0.4, { metalness: 0.3 }),
      slot.x - run / 2 + (run) * ((i + 0.5) / n), slot.y + s / 2, slot.z + (r() - 0.5) * (slot.depth || 0.2) * 0.5, parent);
    b.rotation.y = r() * Math.PI;
    b.userData.isStock = true;
  }
}