// PDP step — side-by-side: generic recommendations vs persona-aware bundles
function StepPDP({ state, setState }) {
  const persona = window.PERSONAS.find(p => p.id === state.persona) || window.PERSONAS[0];
  const favorites = state.favorites || [];

  const switchPersona = (id) => setState(s => ({ ...s, persona: id, favorites: [] }));

  // Anchor product: WX Valor (a best-selling ballistic wrap, in both catalogs).
  const anchorId = 'wx-valor-tan-chval06t-0';
  const anchor = window.PRODUCTS.find(p => p.id === anchorId) || window.PRODUCTS[0];

  return (
    <div className="sbs-shell">
      <div className="sbs-grid">
        <PDPColumn mode="alpha" anchor={anchor} persona={persona} favorites={favorites} />
        <PDPColumn mode="malachyte" anchor={anchor} persona={persona} favorites={favorites} />
      </div>
    </div>
  );
}

function PDPColumn({ mode, anchor, persona, favorites }) {
  const isMal = mode === 'malachyte';
  const favWeights = window.buildFavWeights ? window.buildFavWeights(favorites) : null;
  const handleImgErr = (e) => { e.target.src = window.PRODUCT_FALLBACK; };

  // Generic recs: just same-category items, by SKU
  // Personalized recs: rank by persona affinity within same category + crossover categories
  const sameCat = window.PRODUCTS.filter(p =>
    p.id !== anchor.id && p.cats.some(c => anchor.cats.includes(c))
  );

  const recs = isMal
    ? window.rankProducts(sameCat, persona, favWeights).slice(0, 6)
    : [...sameCat].sort((a, b) => a.sku.localeCompare(b.sku)).slice(0, 6);

  return (
    <div className={`sbs-col sbs-col--${mode}`}>
      <div className="sbs-col__head">
        <span className="sbs-col__tag">{isMal ? 'AFTER' : 'BEFORE'}</span>
        <img
          src={isMal ? 'assets/malachyte-logo-gradient.png' : 'assets/wiley-logo.png'}
          alt={isMal ? 'Malachyte' : 'Wiley X'}
          className={`sbs-col__logo sbs-col__logo--${isMal ? 'mal' : 'wiha'}`}
        />
        <span className="sbs-col__caption">{isMal ? 'Persona-aware bundles' : 'Static recommendations'}</span>
      </div>

      <div className="sbs-col__viewport">
        <div className="demo-urlbar">
          <div className="demo-urlbar__dots"><span /><span /><span /></div>
          <div className="demo-urlbar__url">
            wileyx.com/products/{anchor.url ? anchor.url.split('/').pop() : 'wx-valor'}
            {isMal ? ' · personalized by malachyte' : ''}
          </div>
        </div>

        <WihaChrome />

        <div className="wiha-plp-root">
          <div className="wiha-crumbs">
            <a>Home</a><span className="sep">/</span>
            <a>Sunglasses</a><span className="sep">/</span>
            <span className="current">{anchor.name}</span>
          </div>

          <div className="pdp-anchor">
            <div className="pdp-anchor__img">
              <img src={anchor.img} alt={anchor.name} onError={handleImgErr} />
            </div>
            <div className="pdp-anchor__body">
              <h2 className="pdp-anchor__name">{anchor.name}</h2>
              <div className="pdp-anchor__price">${anchor.price.toFixed(2)}</div>
              <p className="pdp-anchor__desc">
                Ballistic-rated to ANSI Z87.1 and MIL-PRF impact standards. Captivate™ polarized lens
                for high-contrast clarity. Removable facial cavity seal blocks wind, dust and debris.
                Rx-ready with prescription rim insert.
              </p>
            </div>
          </div>

          <div className="pdp-recs">
            <div className="pdp-recs__head">
              {isMal ? (
                <h3 className="pdp-recs__title">Frequently bought with this</h3>
              ) : (
                <h3 className="pdp-recs__title">You may also like</h3>
              )}
            </div>

            <div className="pdp-carousel">
              {recs.map((p, i) => (
                <a key={p.id} className="pdp-rec-mini" href="#" onClick={(e) => e.preventDefault()}>
                  <div className="pdp-rec-mini__img">
                    <img src={p.img} alt={p.name} onError={handleImgErr} />
                  </div>
                  <div className="pdp-rec-mini__name">{p.name}</div>
                  <div className="pdp-rec-mini__price">${p.price.toFixed(2)}</div>
                  {isMal && i < 3 && <div className="pdp-rec-mini__rank">#{i + 1}</div>}
                </a>
              ))}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

Object.assign(window, { StepPDP });