/**
 * BuyList — the shop's BUY side: a scrollable list of stock rows.
 *
 * Each stock good is ONE WIDE ROW (replacing the old 4×4 icon grid):
 *
 *   ┌────────────────────────────────────────────────────────────┐
 *   │ BUY                                                        │
 *   │ ┌────────────────────────────────────────────────────────┐ │
 *   │ │ [icon]  Fresh Produce        3 left    24 cr   − 0 +   │ │
 *   │ │         Crisp, clean, alive. A small mir…               │ │
 *   │ │ [icon]  Refined Fuel        SOLD OUT  41 cr   − 1 +   │ │
 *   │ │         The lifeblood of the fleet.                    │ │
 *   │ └────────────────────────────────────────────────────────┘ │
 *   └────────────────────────────────────────────────────────────┘
 *
 *   · LEFT   — the good's icon (its goods-sheet frame).
 *   · TITLE  — line 1: the NAME, then (padding) the INVENTORY ("3 left" /
 *              "SOLD OUT" — the origin's remaining daily batch, model v2),
 *              then (padding) the BUY PRICE ("24 cr") + the −/qty/+ stepper.
 *              Batch-limited rows carry the strip; unlimited rows (hubs'
 *              resale) don't — the name/price just get the padding room.
 *   · DESC   — line 2: the one-line DESCRIPTION (the good's `flavor` from
 *              data/goods.json), wrapped to fit the row's full width (the
 *              title line owns the right side, so this line is unshared).
 *
 * A row with qty > 0 (in the pending trade) is highlighted — the same
 * selection the old grid's steppers tracked (getBuyMap).
 *
 * SCROLLING — 8–16 rows don't fit in the panel, so the list scrolls:
 * drag on the list body, or the mouse wheel (Phaser 4's object-level
 * pointermove + wheel events, the MapWindow.js recipe). Rows are CLIPPED to
 * the viewport: the plate is drawn only for the slice inside the window
 * (partial rows read as a clean cut at the edge) and the text/icons render
 * only while they fit WHOLLY inside (this Phaser build, 4.2.1 Giedi, has no
 * camera/mask clip, so text pixels can't be cropped — a partially-out glyph
 * would ghost over the title or onto the Confirm bar below). A SCROLLBAR on
 * the right (track + drag/jump thumb) shows the content overflows and where
 * the window is. Scrolling never touches the SELECTION: buyQty is plain
 * data keyed by good id, so stepping a good works whether or not its row is
 * on screen.
 *
 * The PRICING lives in js/economy/Economy.js (shopFor → the fixed
 * per-(good, shop) buy price); this component only shows it and tracks the
 * SELECTION. ShopView (js/ui/shop/ShopView.js) composes it beside the SELL
 * grid (TradeGrid), runs the trade preview (Economy.tradePreview) and
 * applies it to the ship.
 *
 * Headless-safe: the Phaser rendering is best-effort (guarded), and the
 * selection + scroll LOGIC (bumpBuy / getBuyMap / scrollBy) is plain data so
 * dev/shop-ui.test.mjs can drive it with no scene.
 */
import Phaser from '../../vendor/phaser.js';
import { config } from '../../config/Config.js';
import { toColor, toCss } from '../../utils/Color.js';
import { GOODS_TEXTURE_KEY, goodFrame } from '../../economy/Economy.js';
import { fontStack } from '../../utils/Theme.js';

export class BuyList extends Phaser.GameObjects.Container {
  /**
   * @param {object} scene — the SurfaceScene (or a headless fake).
   * @param {object} o — { width, height } (ShopView sizes it; height matches
   *   the SELL grid so the two panels align top AND bottom).
   */
  constructor(scene, o = {}) {
    super(scene, 0, 0);
    this.scene = scene;
    const bl = config.section('shopui.buyList', {});
    this.width = Math.max(320, Number(o.width) || bl.w || 560);
    this.height = Math.max(160, Number(o.height) || 480);
    this.pad = bl.pad ?? 14;
    this.titleH = config.get('shopui.panel.title.h', 34);
    this.rowH = bl.rowH ?? 72;
    this.rowGap = bl.rowGap ?? 6;
    this.iconSize = bl.icon ?? 44;
    this.iconGap = bl.iconGap ?? 12;
    // The description may WRAP onto up to `maxLines` lines (real Phaser
    // word-wraps it at the text column's width — see _addRow; the headless
    // char-count fit below budgets maxLines lines so it never bleeds into
    // the price/stepper either way).
    this.descLines = Math.max(1, Math.floor(Number(bl.desc?.maxLines) || 2));
    this.st = config.section('shopui.stepper', {}); // shared stepper knobs
    this.stepperW = this.st.w ?? 88;
    this.priceW = bl.price?.w ?? 64;
    // The inventory strip ("N left" / "SOLD OUT", model v2) — its reserved
    // width + the TITLE-LINE paddings (name → inventory, inventory → price).
    this.stockW = Number(bl.stock?.w) || 78;
    this.stockGap = Number(bl.stock?.gap) || 16;
    this.bl = bl;

    // The viewport (the scroll window, under the title) — the list's
    // content taller than this is what scrolls.
    this.vpX = this.pad;
    this.vpY = this.titleH + this.pad;
    this.vpW = this.width - this.pad * 2;
    this.vpH = Math.max(40, this.height - this.vpY - this.pad);

    // --- state -----------------------------------------------------------
    this.stock = [];                 // [{ id, name, price }] (shopFor output)
    this.buyQty = new Map();         // goodId -> qty in the pending trade
    this.rows = [];                  // per row: { id, name, desc, price, objs, y0, shown }
    this._objs = [];                 // everything we create (destroy())
    this._surface = null;            // the scroll surface (drag + wheel)
    this._drag = null;               // { y } while a press drags the list
    this._tap = null;                // { x, y, moved } — the tap candidate (row tap → scout)

    // --- focus glow (the light stroke around the scouted row) -------------
    this._focusId = null;            // the row id under focus (null = none)
    this._focus = null;              // the glow graphics (above the rows)
    this._onRow = null;              // row-tap handler (ShopView toggles the scout)

    // --- scrollbar (right edge of the viewport) ---------------------------
    this._sb = null;                 // the track+thumb graphics
    this._sbThumb = null;            // { x, y, w, h } list-local, while scrollable
    this._sbDrag = null;             // { py, scroll } while a press drags the thumb

    // --- geometry (scroll) ----------------------------------------------
    this._scroll = 0;                // px scrolled from the top
    this.maxScroll = 0;              // max(0, contentH - vpH), set on refresh
    this.contentH = 0;               // full content height (set in _layoutRows)

    this._buildPanel();
    this._buildTitle();
    this._buildSurface();            // BEFORE the rows (rows paint above it)
    this._buildScrollbar();          // AFTER the surface; refresh() re-adds it
                                     // ABOVE the rows (they're created later)
    this._buildFocus();              // the focus glow; refresh() re-adds it
                                     // ABOVE the rows + scrollbar
  }

  // ------------------------------------------------------------------ panel
  _buildPanel() {
    const p = config.get('shopui.panel', {});
    const gr = this.scene.add?.graphics?.();
    if (gr) {
      this._objs.push(gr);
      gr.clear?.();
      if (typeof gr.fillStyle === 'function') {
        gr.fillStyle(_hex(p.bgColor ?? '#0a1120'), p.bgAlpha ?? 0.7);
        gr.lineStyle?.(1, _hex(p.border ?? '#22405f'), 255);
      }
      gr.fillRect?.(0, 0, this.width, this.height);
      // Parent it to the list (same reason as TradeGrid — scene-level depth
      // 0 renders BEHIND the shop video in this build; container children
      // inherit the list's depth + translation). Added first = behind rows.
      this.add?.(gr);
    }
  }

  _buildTitle() {
    const t = this.scene.add?.text?.(
      this.width / 2, 8, 'BUY',
      {
        fontSize: `${config.get('shopui.panel.title.fontSize', 21)}px`,
        color: config.get('shopui.panel.title.color', '#eaf6ff'),
        align: 'center', fontFamily: fontStack('header'), // Ethnocentric — the theme's section face
      },
    );
    if (t) {
      t.setOrigin?.(0.5, 0);
      this.title = t;
      this._objs.push(t);
      this.add?.(t);
    }
  }

  // ------------------------------------------------------- scroll surface
  /**
   * The scroll surface: an (undrawn) interactive rect over the viewport.
   * Drag (pointerdown → pointermove → pointerup/out) and wheel scroll the
   * list — the MapWindow.js recipe (Phaser 4's input plugin delivers object-
   * level pointermove + wheel over the hit area). The row steppers sit ABOVE
   * it and stopPropagation() their clicks, so tapping −/+ never drags.
   */
  _buildSurface() {
    const g = this.scene.add?.graphics?.();
    if (!g) return;
    this._surface = g;
    this._objs.push(g);
    this.add?.(g);
    if (typeof g.setInteractive !== 'function' || typeof g.on !== 'function') return;

    const Rect = Phaser.Geom?.Rectangle;
    const area = Rect ? new Rect(this.vpX, this.vpY, this.vpW, this.vpH) : null;
    g.setInteractive({
      useHandCursor: false,
      hitArea: area,
      hitAreaCallback: (p, px, py) => (area ? Rect.Contains(p, px, py) : true),
    });
    g.on('pointerdown', (p) => {
      this._drag = { y: p?.y ?? 0 };
      this._tap = { x: p?.x ?? 0, y: p?.y ?? 0, moved: false }; // tap candidate
    });
    g.on('pointermove', (p) => {
      if (this._drag && p && typeof p.y === 'number') {
        if (this._tap && (Math.abs(p.x - this._tap.x) > 6 || Math.abs(p.y - this._tap.y) > 6)) {
          this._tap.moved = true; // it's a drag, not a tap
        }
        this.scrollBy(p.y - this._drag.y);
        this._drag = { y: p.y };
      }
    });
    g.on('pointerup', () => {
      this._drag = null;
      this._tapUp(); // a press released without dragging = a row tap (scout)
    });
    g.on('pointerout', () => { this._drag = null; this._tap = null; }); // left the list → end drag
    g.on('wheel', (p, _dx, dy) => {
      // line-mode wheels report small dy (MapWindow's deltaMode check).
      const dyPx = (p?.event?.deltaMode ?? 0) === 1 ? dy * 32 : dy;
      if (dyPx) this.scrollBy(dyPx);
    });
  }

  // ------------------------------------------------------------- row taps
  /**
   * The tap half of a down→up on the scroll surface with no drag in
   * between — the TRADE-SCOUT trigger (js/ui/shop/ShopView.js → the scout
   * panel replaces the cargo grid): resolve the tapped row's box (if the
   * tap is in one) and fire onRowTap. A tap on dead list space fires
   * onRowTap(null) — "click anywhere else" closes the scout. Taps over the
   * scrollbar are scroll actions, not row taps; the steppers stop their
   * own events so −/+ never reach here.
   */
  _tapUp() {
    const t = this._tap;
    this._tap = null;
    if (!t || t.moved || typeof this._onRow !== 'function') return;
    // A tap barely moves between down and up — the down point IS the tap
    // point (and a stub scene's bare events carry no up-point anyway).
    let lx = t.x - (this.x ?? 0);
    let ly = t.y - (this.y ?? 0);
    const el = this._surface;
    if (el && typeof el.getLocalPoint === 'function') {
      const out = { x: 0, y: 0 };
      try {
        const r = el.getLocalPoint(t.x, t.y, out);
        if (r && Number.isFinite(r.x) && Number.isFinite(r.y)) { lx = r.x; ly = r.y; }
      } catch { /* fall back to the world delta */ }
    }
    // A scrollbar click scrolls — it must never open/close the scout.
    if (this.maxScroll > 0) {
      const sb = this._sbGeom();
      if (lx >= sb.x - 6 && lx <= sb.x + sb.w + 6 && ly >= sb.y - 6 && ly <= sb.y + sb.h + 6) return;
    }
    this._onRow(this._rowAt(lx, ly));
  }

  /** The row whose box contains a list-local point (null = dead space). */
  _rowAt(lx, ly) {
    if (!Number.isFinite(lx) || !Number.isFinite(ly)) return null;
    if (ly < this.vpY || ly > this.vpY + this.vpH) return null;
    if (lx < this.vpX || lx > this.vpX + this.vpW) return null;
    for (const row of this.rows) {
      if (!row.shown) continue; // clipped out — can't be tapped
      const y = row.y0 - this._scroll;
      if (ly >= y - this.rowH / 2 && ly <= y + this.rowH / 2) return row;
    }
    return null;
  }

  /** Row-tap handler (ShopView toggles the trade scout). null = background. */
  set onRowTap(fn) { this._onRow = typeof fn === 'function' ? fn : null; }
  get onRowTap() { return this._onRow; }

  // ----------------------------------------------------------- scrollbar
  // Track + thumb at the viewport's right edge (in the panel's right pad,
  // clear of the rows). Hidden while the content fits the window.
  _sbGeom() {
    const sb = this.bl.scrollbar ?? {};
    const w = Math.max(3, Number(sb.w) || 5);
    const gap = Math.max(2, Number(sb.gap) || 3);
    return {
      x: this.vpX + this.vpW + gap, // just right of the rows, inside the panel
      y: this.vpY,
      w,
      h: this.vpH,
      min: Math.max(20, Number(sb.thumbMin) || 28),
      trackColor: sb.trackColor ?? '#22405f',
      thumbColor: sb.thumbColor ?? '#7d92c4',
      trackAlpha: Number(sb.trackAlpha) || 0.4,
      thumbAlpha: Number(sb.thumbAlpha) || 0.85,
    };
  }

  // Thumb height for the current content (viewport's share of the content,
  // with a min so a short overflow is still grabbable).
  _sbThumbH() {
    const sb = this._sbGeom();
    const contentH = Math.max(1, this.contentH || this.vpH);
    return Math.max(sb.min, sb.h * (this.vpH / contentH));
  }

  // Scroll position for a press at list-local `py` (thumb centered on it).
  _sbScrollForPoint(py) {
    if (!this.maxScroll || typeof py !== 'number') return 0;
    const sb = this._sbGeom();
    const th = this._sbThumbH();
    const frac = Math.max(0, Math.min(1, (py - sb.y - th / 2) / Math.max(1, sb.h - th)));
    return frac * this.maxScroll;
  }

  // Pointer (canvas/world) → list-local y. The scrollbar sits at (0,0) in
  // list-local with origin (0,0), so its local frame IS list-local.
  _localY(p) {
    if (!p || typeof p.y !== 'number') return null;
    const el = this._sb;
    if (el && typeof el.getLocalPoint === 'function') {
      const out = { x: 0, y: 0 };
      try {
        const r = el.getLocalPoint(p.x ?? 0, p.y, out);
        if (r && Number.isFinite(r.y)) return r.y;
      } catch { /* fall through */ }
    }
    return p.y - (this.y ?? 0);
  }

  _buildScrollbar() {
    const g = this.scene.add?.graphics?.();
    if (!g) return;
    this._sb = g;
    this._objs.push(g);
    this.add?.(g);
    if (typeof g.setInteractive !== 'function' || typeof g.on !== 'function') return;
    const Rect = Phaser.Geom?.Rectangle;
    const sb = this._sbGeom();
    const pad = 5; // grab margin around the track
    const area = Rect ? new Rect(sb.x - pad, sb.y - pad, sb.w + pad * 2, sb.h + pad * 2) : null;
    g.setInteractive({
      useHandCursor: true,
      hitArea: area,
      hitAreaCallback: (hit, px, py) => (area ? Rect.Contains(hit, px, py) : true),
    });
    g.on('pointerdown', (p) => {
      if (!this.maxScroll) return;
      const py = this._localY(p);
      if (py == null) return;
      // Jump (thumb centers on the press) + track the drag from there.
      this.scrollTo(this._sbScrollForPoint(py));
      this._sbDrag = { py, scroll: this._scroll };
    });
    g.on('pointermove', (p) => {
      if (!this._sbDrag || !this.maxScroll) return;
      const py = this._localY(p);
      if (py == null) return;
      const dy = py - this._sbDrag.py;
      const th = this._sbThumbH();
      this._sbDrag = { py, scroll: this._sbDrag.scroll + dy * (this.maxScroll / Math.max(1, this._sbGeom().h - th)) };
      this.scrollTo(this._sbDrag.scroll);
    });
    g.on('pointerup', () => { this._sbDrag = null; });
    g.on('pointerout', () => { this._sbDrag = null; }); // left the bar → end drag
  }

  // Track + thumb for the current scroll (list-local coords on `this._sb`).
  _renderScrollbar() {
    const g = this._sb;
    if (!g || typeof g.clear !== 'function' || typeof g.fillRect !== 'function') return;
    g.clear?.();
    // Not scrollable → nothing to show (no track, no thumb).
    if (this.maxScroll <= 0 || !this.contentH) { this._sbThumb = null; return; }
    const sb = this._sbGeom();
    g.fillStyle(_hex(sb.trackColor), sb.trackAlpha);
    g.fillRect(sb.x, sb.y, sb.w, sb.h);
    const th = this._sbThumbH();
    const ty = sb.y + (this.maxScroll > 0 ? (this._scroll / this.maxScroll) : 0) * (sb.h - th);
    g.fillStyle(_hex(sb.thumbColor), sb.thumbAlpha);
    g.fillRect(sb.x + 1, ty + 1, Math.max(1, sb.w - 2), Math.max(1, th - 2));
    this._sbThumb = { x: sb.x, y: ty, w: sb.w, h: th };
  }

  // ----------------------------------------------------------- focus glow
  /**
   * The light stroke around the SCOUTED row — the "this box" highlight
   * (the player tapped it, the scout panel shows its strategy). A two-pass
   * outline: a soft wide glow under a bright thin core, in the row's
   * CLIPPED slice (it follows the row as the list scrolls, and vanishes
   * when the row scrolls out — same recipe as the plates' clipping).
   */
  _buildFocus() {
    const g = this.scene.add?.graphics?.();
    if (!g) return;
    this._focus = g;
    this._objs.push(g);
    this.add?.(g); // refresh() re-adds it ABOVE the rows + scrollbar
    g.clear?.();
  }

  /**
   * Focus a row (or null to clear). Renders the glow immediately (when the
   * row is visible) and keeps it in step on scroll (refresh/_clipRows
   * re-render it).
   */
  focusRow(id) {
    this._focusId = id ?? null;
    this._renderFocus();
    return this;
  }

  _renderFocus() {
    const g = this._focus;
    if (!g || typeof g.clear !== 'function' || typeof g.lineStyle !== 'function' || typeof g.strokeRect !== 'function') return;
    g.clear();
    const row = this._focusId ? this.rows.find((r) => r.id === this._focusId) : null;
    if (!row || !row.shown || row.clipBot <= row.clipTop) { this._focusOn = false; return; }
    const f = this.bl.focus ?? {};
    const color = _hex(f.color ?? '#00e5ff');
    const y = row.y0 - this._scroll;
    const top = Math.max(y - this.rowH / 2, row.clipTop) - 1;
    const bot = Math.min(y + this.rowH / 2, row.clipBot) + 1;
    const x = this.vpX - 1;
    const w = this.vpW + 2;
    g.lineStyle(Math.max(2, Number(f.glow) || 5), color, Math.round(255 * (f.glowAlpha ?? 0.30)));
    g.strokeRect(x, top, w, bot - top);     // the soft wide glow
    g.lineStyle(Math.max(1, Number(f.core) || 1.5), color, Math.round(255 * (f.alpha ?? 0.95)));
    g.strokeRect(x + 1.5, top + 1.5, w - 3, bot - top - 3); // the bright core
    this._focusOn = true;
  }

  // ------------------------------------------------------------------ rows
  /**
   * Set the list's contents from the shop's stock (Economy.shopFor → buy:
   * [{ id, name, price, produced }]). The description is the good's `flavor`
   * line (data/goods.json). Resets the selection (a fresh shop view).
   */
  refresh(o = {}) {
    const stock = Array.isArray(o.stock) ? o.stock : [];
    // `left` = the shop's REMAINING BATCH for this row (the origin's daily
    // stock — js/economy/Stock.js). Finite on batch-limited rows (a world's
    // signature good); null/absent = unlimited (hubs' resale, the old model).
    this.stock = stock.map((s) => (typeof s === 'string'
      ? { id: s }
      : { id: s.id, name: s.name, price: s.price,
          left: Number.isFinite(s.left) ? Math.max(0, Math.floor(s.left)) : null }));
    this.buyQty = new Map();
    this._destroyRows();
    for (const s of this.stock) this._addRow(s);
    this._layoutRows();
    this._clipRows();
    // The rows were added AFTER the scrollbar graphics — re-append it so it
    // paints on top (v4 paints children in list order). No-op when headless.
    if (this._sb) this.add?.(this._sb);
    // …and the focus glow on top of everything (it frames a row's slice).
    if (this._focus) { this.add?.(this._focus); this._renderFocus(); }
    return this;
  }

  _addRow(s) {
    const bl = this.bl;
    const id = s.id;
    const name = s.name ?? id;
    const price = Math.round(Number(s.price) || 0);
    const flavor = this._flavorOf(id);

    const row = { id, name, desc: '', price, left: Number.isFinite(s.left) ? Math.max(0, Math.floor(s.left)) : null, objs: {}, y0: 0, shown: true };

    // row plate (bg + border) — the whole row's width, in the viewport
    const bg = this.scene.add?.graphics?.();
    if (bg) { row.objs.bg = bg; this._objs.push(bg); this.add?.(bg); }

    // icon (guarded — headless has no texture). Created with a placeholder
    // frame, then bound to THIS good's frame via setTexture(key, frame) — the
    // TradeGrid recipe (NOT the read-only `.frame = n` assignment that
    // corrupted the texture source and crashed the real WebGL render).
    if (this.scene.textures && typeof this.scene.textures.exists === 'function' &&
        this.scene.textures.exists(GOODS_TEXTURE_KEY)) {
      const icon = this.scene.add?.image?.(0, 0, GOODS_TEXTURE_KEY, 0);
      if (icon) {
        icon.setOrigin?.(0.5, 0.5);
        icon.setScale?.(this.iconSize / 128); // the sheet's frames are 128×128
        icon.setTexture?.(GOODS_TEXTURE_KEY, goodFrame(id));
        row.objs.icon = icon; this._objs.push(icon); this.add?.(icon);
      }
    }

    // name (TITLE LINE — the first line, left of the inventory strip +
    // price). Truncated to the name's budget (_nameMaxW — it stops BEFORE
    // the inventory strip, or before the price on unlimited rows), so the
    // title and the strip can never collide.
    const nameFont = Number(bl.name?.fontSize) || 14;
    const nameText = this._fitText(name, nameFont, 1, this._nameMaxW(row));
    const descFont = Number(bl.desc?.fontSize) || 12;
    const textX = this._textX();
    const nameEl = this._makeText(
      textX, 0, nameText,
      { fontSize: `${nameFont}px`, color: bl.name?.color ?? '#eaf6ff', align: 'left' },
    );
    if (nameEl) { nameEl.setOrigin?.(0, 0.5); row.objs.name = nameEl; this._objs.push(nameEl); this.add?.(nameEl); }

    // description (LINE 2 — its own line; the title line owns the right
    // block, so the desc gets the row's full text width).
    row.desc = this._fitText(flavor, descFont, this.descLines, this._descMaxW());
    const descEl = this._makeText(
      textX, 0, row.desc,
      { fontSize: `${descFont}px`, color: bl.desc?.color ?? '#7d92c4', align: 'left' },
    );
    if (descEl) {
      // Word-wrap inside the text column (the row's full width — the right
      // block is on the title line above, so nothing shares this line).
      descEl.setWordWrap?.(true);
      descEl.setWordWrapWidth?.(this._descMaxW());
      descEl.setOrigin?.(0, 0.5);
      row.objs.desc = descEl; this._objs.push(descEl); this.add?.(descEl);
    }

    // price (TITLE LINE — right of the inventory strip, left of the stepper)
    const bx = this._btnXs();
    const priceEl = this._makeText(
      0, 0, `${price} cr`,
      { fontSize: `${bl.price?.fontSize ?? 14}px`, color: bl.price?.color ?? '#ffc94d', align: 'right' },
    );
    if (priceEl) { priceEl.setOrigin?.(1, 0.5); row.objs.price = priceEl; this._objs.push(priceEl); this.add?.(priceEl); }

    // REMAINING BATCH (model v2 — the origin world's daily stock, the one
    // stateful number in the economy): "3 left" sits just left of the price
    // on the TITLE LINE (right-aligned, like it), with the stockGap padding
    // on both sides; 0 = SOLD OUT (magenta, the stepper is clamped at the
    // same number). Only batch-limited rows have one — hubs' resale is
    // unlimited (left === null → no element).
    if (row.left != null) {
      const leftEl = this._makeText(
        0, 0, row.left > 0 ? `${row.left} left` : 'SOLD OUT',
        { fontSize: `${bl.stock?.fontSize ?? bl.price?.fontSize ?? 14}px`, color: row.left > 0 ? (bl.stock?.color ?? bl.price?.color ?? '#ffc94d') : '#ff2d6f', align: 'right' },
      );
      if (leftEl) { leftEl.setOrigin?.(1, 0.5); row.objs.left = leftEl; this._objs.push(leftEl); this.add?.(leftEl); }
    }

    // stepper: −  qty  +  (the qty tap = +1, the old grid's behavior).
    // Centered origin: _btnXs() positions each stepper at its intended
    // CENTER, so render the glyph centered on that point (name/desc/price
    // above set their origins the same way). The tap square is centered on
    // the glyph in _bindStep.
    const mkStep = (str) => {
      const t = this._makeText(0, 0, str, {
        fontSize: `${this.st.fontSize ?? 19}px`,
        color: this.st.btn ?? '#7d92c4', align: 'center',
      });
      t?.setOrigin?.(0.5, 0.5);
      return t;
    };
    const minus = mkStep('−');
    const qty = mkStep('0');
    const plus = mkStep('+');
    if (minus) { row.objs.minus = minus; this._objs.push(minus); this.add?.(minus); }
    if (qty) { row.objs.qty = qty; this._objs.push(qty); this.add?.(qty); }
    if (plus) { row.objs.plus = plus; this._objs.push(plus); this.add?.(plus); }
    // The steppers sit on the scroll surface; stopPropagation keeps a
    // stepper tap from starting a list drag (TradeGrid's recipe).
    this._bindStep(minus, () => this.bumpBuy(id, -1), row);
    this._bindStep(qty, () => this.bumpBuy(id, +1), row);
    this._bindStep(plus, () => this.bumpBuy(id, +1), row);

    this.rows.push(row);
  }

  _bindStep(el, fn, row) {
    if (!el || typeof el.setInteractive !== 'function' || typeof el.on !== 'function') return;
    const Rect = Phaser.Geom?.Rectangle;
    // THIS BUILD's input convention (pointWithinHitArea / getLocalPoint in
    // the phaser build): hitAreaCallback(hitArea, localX, localY, obj), with
    // localX/Y in the object's TOP-LEFT-anchored frame (the input adds
    // displayOrigin) — so a Text glyph always spans (0,0)-(w,h) there,
    // regardless of origin. (A fixed rect centered on (0,0) sits upper-left
    // of the visible button, anchored on its top-left corner.)
    //
    // Test against the LIVE glyph size inside the callback: the qty text
    // re-measures on every bump ("0"=25px wide, "1"=17px ...), the
    // top-left anchor moves with it, and a rect baked at bind time slides
    // (the narrower "1" made the old box drift right and swallow the gap
    // toward "+").
    const PAD = 6;
    const live = (px, py) => {
      const w = el.width > 0 ? el.width : 12;
      const h = el.height > 0 ? el.height : 18;
      return px >= -PAD && px <= w + PAD && py >= -PAD && py <= h + PAD;
    };
    const area = Rect ? new Rect(-PAD, -PAD, 1, 1) : null; // placeholder — the callback does the real test
    el.setInteractive({
      useHandCursor: true,
      hitArea: area,
      // Dead when the row is scrolled out of the viewport (alpha-0 buttons
      // must not be tappable), and also when the stepper itself is clipped
      // out at a window edge (_elInVp — hidden glyphs stay unclickable).
      hitAreaCallback: (hit, px, py) => (row.shown && this._elInVp(el) && live(px, py)),
    });
    el.on('pointerdown', (p) => {
      p?.stopPropagation?.();
      if (row.shown && this._elInVp(el)) fn();
    });
  }

  // Text block's left edge (after the icon) — shared by name + desc.
  _textX() {
    return -this.vpW / 2 + this.pad + this.iconSize + this.iconGap;
  }

  // Stepper button x's (row-local, right end of the row) + the title-line
  // right block: [name] … [inventory strip] … [price] [stepper], all on the
  // product-title line. `left` is the strip's RIGHT edge (origin 1,0.5);
  // stockGap pads both the name→strip and strip→price gaps.
  _btnXs() {
    const right = this.vpW / 2 - this.pad;
    const price = right - (this.stepperW) - 10; // price's RIGHT edge (origin 1,0.5)
    const left = price - this.priceW - this.stockGap; // strip's RIGHT edge
    return {
      plus: right - 11,
      qty: right - 44,
      minus: right - 77,
      price,
      left,
    };
  }

  // The NAME's budget on the title line (row-local px): from the text column
  // to the inventory strip (batch-limited rows), or to the price (unlimited
  // rows — no strip). stockGap padding is kept on the strip/price side.
  _nameMaxW(row) {
    const bx = this._btnXs();
    const rightEdge = (row && row.left != null)
      ? bx.left - this.stockW - this.stockGap
      : bx.price - this.priceW - this.stockGap;
    return Math.max(20, rightEdge - this._textX());
  }

  // Max description width (px) — LINE 2 is the desc's own line (the
  // name/inventory/price/stepper block sits on the title line above), so
  // it gets the row's full text width.
  _descMaxW() {
    const right = this.vpW / 2 - this.pad;
    return Math.max(20, right - this._textX() - 4);
  }

  // Truncate `str` to fit ~maxW px over `maxLines` line(s) at fontSize
  // (deterministic char estimate — no text metrics needed; the headless
  // stubs have none). Real Phaser word-wraps at _descMaxW() per line;
  // this cap is the fail-safe that keeps the total inside maxLines lines.
  _fitText(str, fontSize, maxLines = 1, maxW = null) {
    const s = String(str ?? '');
    if (!s) return '';
    const w = Math.max(20, maxW ?? this._descMaxW());
    const perLine = Math.max(4, Math.floor(w / (fontSize * 0.55)));
    const maxChars = perLine * Math.max(1, Math.floor(Number(maxLines) || 1));
    if (s.length <= maxChars) return s;
    return `${s.slice(0, Math.max(0, maxChars - 1)).trimEnd()}…`;
  }

  _flavorOf(id) {
    const list = config.get('goods.goods', []);
    return list.find((g) => g.id === id)?.flavor ?? '';
  }

  _makeText(x, y, str, style) {
    const t = this.scene.add?.text?.(x, y, str, {
      fontFamily: fontStack('body'), // Centauri — the theme's body face
      fontSize: style.fontSize, color: style.color, align: style.align,
    });
    return t ?? null;
  }

  // ---------------------------------------------------------------- scroll
  /** Scroll by `dy` px (clamped to [0, maxScroll]); re-clips the rows. */
  scrollBy(dy) {
    this.scrollTo(this._scroll + Math.floor(Number(dy) || 0));
    return this;
  }

  scrollTo(v) {
    const n = Math.max(0, Math.min(this.maxScroll, Number(v) || 0));
    if (n === this._scroll) return this;
    this._scroll = n;
    this._clipRows();
    return this;
  }

  // Row-based clip: lay rows at (y0 − scroll), then render ONLY what is
  // inside the viewport — this build has no camera/mask clip, so:
  //   · row.shown = the row's body OVERLAPS the window (drives hit-testing
  //     + the plate);
  //   · the plate draws only the intersecting slice (a partial row reads as
  //     a clean cut at the window edge, not a spill over the title or onto
  //     the Confirm bar);
  //   · text/icons render only while they fit WHOLLY inside (a glyph can't
  //     be cropped in this build — half-out would ghost over the title
  //     above / the sub-bar below, so it hides until fully in).
  _layoutRows() {
    const n = this.rows.length;
    const contentH = n * this.rowH + Math.max(0, n - 1) * this.rowGap;
    this.contentH = contentH;
    this.maxScroll = Math.max(0, contentH - this.vpH);
    this._scroll = Math.max(0, Math.min(this._scroll, this.maxScroll));
    for (let i = 0; i < n; i++) {
      this.rows[i].y0 = this.vpY + i * (this.rowH + this.rowGap) + this.rowH / 2;
    }
  }

  // Strict containment: `el`'s whole vertical box inside the viewport. (A
  // partially out element would render pixels OVER the title / below the
  // panel — this build can't crop it, so hide it entirely.) Scaled objects
  // (the 128px icon frames scaled down) count at their DISPLAYED size.
  _elInVp(el, vpTop = this.vpY, vpBot = this.vpY + this.vpH) {
    if (!el || typeof el.y !== 'number') return false;
    const h = (Number(el.height) > 0 ? el.height : 20) * (el.scaleY ?? 1) / 2;
    return el.y - h >= vpTop - 0.5 && el.y + h <= vpBot + 0.5;
  }

  _clipRows() {
    const cx = this.vpX + this.vpW / 2;
    const vpTop = this.vpY;
    const vpBot = this.vpY + this.vpH;
    for (const row of this.rows) {
      const y = row.y0 - this._scroll;
      const top = y - this.rowH / 2;
      const bottom = y + this.rowH / 2;
      row.shown = top < vpBot && bottom > vpTop; // overlaps the window at all
      row.clipTop = Math.max(top, vpTop);        // list-local slice bounds (plate)
      row.clipBot = Math.min(bottom, vpBot);
      const o = row.objs;
      const tx = cx + this._textX(); // row-local → list-local (row center at cx)
      const bx = this._btnXs();
      const titleY = y - this.rowH * 0.18; // the TITLE LINE (name · inventory · price · stepper)
      o.bg?.setPosition?.(cx, y);
      o.icon?.setPosition?.(cx - this.vpW / 2 + this.pad + this.iconSize / 2, y);
      o.name?.setPosition?.(tx, titleY);
      o.desc?.setPosition?.(tx, y + this.rowH * 0.27);
      o.price?.setPosition?.(cx + bx.price, titleY);
      o.left?.setPosition?.(cx + bx.left, titleY);
      o.minus?.setPosition?.(cx + bx.minus, titleY);
      o.qty?.setPosition?.(cx + bx.qty, titleY);
      o.plus?.setPosition?.(cx + bx.plus, titleY);
      if (row.shown) {
        for (const el of [o.icon, o.name, o.desc, o.price, o.left, o.minus, o.qty, o.plus]) {
          el?.setAlpha?.(this._elInVp(el, vpTop, vpBot) ? 1 : 0);
        }
      } else {
        for (const el of Object.values(o)) el?.setAlpha?.(0);
      }
    }
    this._renderRows();
    this._renderScrollbar();
    this._renderFocus(); // the scouted row's glow follows the scroll
  }

  // --------------------------------------------------------- DATA (the core)

  /** Adjust a stock good's quantity by `d` (−/+ stepper). Clamped ≥ 0. */
  bumpBuy(id, d = 1) {
    if (!id) return this;
    const row = this.stock.find((s) => s.id === id);
    if (!row) return this; // not in stock
    const cur = this.buyQty.get(id) ?? 0;
    // THE BATCH CLAMP (model v2) — batch-limited rows (a world's signature
    // good) can't be selected past the shop's remaining daily stock;
    // unlimited rows (hubs) have left === null → no cap.
    const cap = row.left != null ? row.left : Infinity;
    const next = Math.max(0, Math.min(cap, cur + Math.floor(Number(d) || 0)));
    if (next === 0) this.buyQty.delete(id);
    else this.buyQty.set(id, next);
    this._renderRow(id);
    this._emitSelChange();
    return this;
  }

  /** { goodId: qty } from the steppers. */
  getBuyMap() {
    const m = {};
    for (const [id, q] of this.buyQty) if (q > 0) m[id] = q;
    return m;
  }

  /**
   * Restore { goodId: qty } stepper quantities onto the CURRENT stock (the
   * ShopView re-applies the player's pending trade after the BUY/SELL toggle
   * rebuilds the panel). Ids no longer in stock are dropped. Call after
   * refresh() (which resets the quantities).
   */
  setBuyMap(map = {}) {
    this.buyQty = new Map();
    for (const [id, q] of Object.entries(map ?? {})) {
      const n = Math.max(0, Math.floor(Number(q) || 0));
      if (n > 0 && this.stock.some((s) => s.id === id)) this.buyQty.set(id, n);
    }
    this._renderRows();
    this._emitSelChange();
    return this;
  }

  hasSelection() {
    return this.buyQty.size > 0;
  }

  clearSelection() {
    this.buyQty = new Map();
    this._renderRows();
    this._emitSelChange();
    return this;
  }

  /** The ShopView hooks this to live-update the preview + Confirm/Clear. */
  set onSelectionChange(fn) { this._onSel = fn; }
  _emitSelChange() {
    if (typeof this._onSel === 'function') this._onSel(this);
  }

  // --------------------------------------------------------------- render
  _renderRows() {
    for (const row of this.rows) this._renderRow(row.id);
  }

  _renderRow(id) {
    const row = this.rows.find((r) => r.id === id);
    if (!row) return;
    const q = this.buyQty.get(id) ?? 0;
    const o = row.objs;
    if (o.qty && typeof o.qty.setText === 'function') o.qty.setText(String(q));

    // in-basket highlight: brighter plate + accent border (the theme's
    // selection cyan), the qty text lit.
    const sel = q > 0;
    const bl = this.bl;
    if (o.bg && typeof o.bg.clear === 'function' && typeof o.bg.fillStyle === 'function') {
      o.bg.clear?.();
      // The plate renders ONLY its slice inside the viewport (the row may be
      // partially out at a window edge — the rest is the cut, not a spill).
      // Draw in the bg object's OWN local space: _clipRows() moves it to the
      // row center (cx, y), and Graphics content is object-local. (Filling at
      // the row's ABSOLUTE list coords used to double the offset — bars
      // drifted right by cx and down by y.)
      if (row.shown) {
        const y = row.y0 - this._scroll;
        const dTop = Math.max(y - this.rowH / 2, row.clipTop ?? (y - this.rowH / 2));
        const dBot = Math.min(y + this.rowH / 2, row.clipBot ?? (y + this.rowH / 2));
        if (dBot > dTop) {
          o.bg.fillStyle(_hex(sel ? (bl.rowSelBg ?? '#12283a') : (bl.rowBg ?? '#0e1728')), sel ? (bl.rowSelBgAlpha ?? 0.85) : (bl.rowBgAlpha ?? 0.55));
          o.bg.lineStyle?.(sel ? 2 : 1, _hex(sel ? (bl.selected ?? '#00e5ff') : (bl.rowBorder ?? '#1d2e4c')), 255);
          o.bg.fillRect?.(-this.vpW / 2, dTop - y, this.vpW, dBot - dTop);
        }
      }
    }
    if (o.qty && typeof o.qty.setColor === 'function') {
      o.qty.setColor(toCss(sel ? (this.st.activeColor ?? '#00e5ff') : (this.st.color ?? '#eaf6ff')));
    }
  }

  _destroyRows() {
    for (const row of this.rows) for (const el of Object.values(row.objs)) el?.destroy?.();
    this.rows = [];
  }

  // --------------------------------------------------------- animation
  /** Slide the panel in from the right (the TradeGrid recipe). */
  slideIn() {
    const ms = config.get('shopui.animation.slideMs', 340);
    const ease = config.get('shopui.animation.ease', 'Cubic.Out');
    const off = this.width + 24;
    const targetX = this.x; // the final x (set by ShopView.setPosition before this)
    const targetY = this.y;
    if (this.scene.tweens && typeof this.scene.tweens.add === 'function') {
      this.x = targetX + off;
      this.y = targetY;
      this.scene.tweens.add({ targets: this, x: targetX, y: targetY, duration: ms, ease, delay: 40 });
    } else {
      this.x = targetX;
    }
    return this;
  }

  destroy() {
    for (const o of this._objs) o?.destroy?.();
    this._objs = [];
    this.rows = [];
    if (typeof super.destroy === 'function') super.destroy();
  }
}

// '#rrggbb' → int (Phaser color) — safe on hex + '#'-prefixed.
function _hex(v) {
  const m = String(v).trim().match(/^#?([0-9a-f]{6})$/i);
  return m ? parseInt(m[1], 16) : 0xffffff;
}