// Road Runner PLP — side-by-side: HOKA today vs With Malachyte
// Gender-filtered by persona: women see women's+all, men see men's+all

function SideBySidePLP({ 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: [] }));
  const toggleFav = (id) => setState(s => {
    const favs = s.favorites || [];
    const next = favs.includes(id) ? favs.filter(x => x !== id) : [...favs, id];
    return { ...s, favorites: next };
  });

  return (
    <div className="sbs-shell">
      <PersonaBar persona={persona} onChange={switchPersona} favoriteCount={favorites.length} />
      <div className="sbs-grid">
        <PLPColumn mode="alpha"     state={state} persona={persona} favorites={favorites} onFav={toggleFav} />
        <PLPColumn mode="malachyte" state={state} persona={persona} favorites={favorites} onFav={toggleFav} />
      </div>
    </div>
  );
}

// HOKA "today" shows the same merchandised catalog to everyone — no personalization.
// Keep this fixed so the BEFORE column is identical across all visitors.
const STATIC_BEFORE_GENDER = 'women';

function PLPColumn({ mode, state, persona, favorites, onFav }) {
  const isMal = mode === 'malachyte';

  // Malachyte personalizes by the visitor's gender; HOKA stays static for all visitors.
  const filterGender = isMal ? persona.gender : STATIC_BEFORE_GENDER;
  const plpPool = window.PRODUCTS.filter(p => {
    if (!p.cats.includes('road-plp')) return false;
    if (p.gender === 'all') return true;
    return p.gender === filterGender;
  });

  const favWeights = window.buildFavWeights ? window.buildFavWeights(favorites) : null;
  const ranked = isMal
    ? window.rankProducts(plpPool, persona, favWeights)
    : window.defaultOrder(plpPool);

  const handleImgErr = (e) => { e.target.src = window.PRODUCT_FALLBACK; };

  return (
    <div className={`sbs-col sbs-col--${mode}`}>
      <div className="sbs-col__head">
        <span className="sbs-col__tag">{isMal ? 'AFTER' : 'BEFORE'}</span>
        <img
          src={isMal ? 'assets/malachyte-logo-gradient.png' : 'uploads/hoka-logo-removebg-preview.png'}
          alt={isMal ? 'Malachyte' : 'HOKA'}
          className={`sbs-col__logo sbs-col__logo--${isMal ? 'mal' : 'brand'}`}
        />
        <span className="sbs-col__caption">{isMal ? 'With Malachyte' : 'HOKA today'}</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">
            hoka.com/collections/road-runner{isMal ? ' · personalized by malachyte' : ''}
          </div>
        </div>

        <HokaChrome />

        <div className="wiha-plp-root">
          <div className="wiha-crumbs">
            <a>Home</a><span className="sep">/</span>
            <span className="current">Road Runner</span>
          </div>

          <h1 className="wiha-plp-title">Road Runner Collection</h1>

          <div className="sbs-toolbar">
            <span className="sbs-toolbar__count">{ranked.length} products</span>
          </div>

          <div className={`wiha-grid-wrap wiha-grid-wrap--${mode}`}>
            <div className="wiha-grid-railbar">
              <span className="wiha-grid-railbar__dot" />
              {isMal
                ? <><b>PERSONALIZED</b> · RANKED FOR <b>{persona.userId}</b> · {persona.gender.toUpperCase()}</>
                : <>SORTED BY BESTSELLERS · SAME ORDER FOR ALL VISITORS</>}
            </div>
            <div className="wiha-grid sbs-grid-inner">
              {ranked.map((p, i) => (
                <ProductCard
                  key={p.id}
                  product={p}
                  index={i}
                  mode={mode}
                  persona={persona}
                  favWeights={favWeights}
                  isFav={favorites.includes(p.id)}
                  onFav={onFav}
                  onImgErr={handleImgErr}
                />
              ))}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

// ── Product card ─────────────────────────────────────────────
function ProductCard({ product, index, mode, persona, favWeights, isFav, onFav, onImgErr }) {
  const isMal = mode === 'malachyte';
  const reason = isMal ? reasonFor(product, persona, favWeights) : null;
  const showRank = isMal && index < 9;

  return (
    <div className={`wiha-card ${showRank ? 'is-ranked' : ''}`}>
      {showRank && <div className="wiha-rank">#{index + 1}</div>}

      {isMal && (
        <button
          className={`wiha-fav ${isFav ? 'wiha-fav--on' : ''}`}
          onClick={(e) => { e.preventDefault(); onFav(product.id); }}
          aria-label={isFav ? 'Remove saved' : 'Save'}
        >
          <svg viewBox="0 0 24 24" width="16" height="16">
            <path d="M12 21s-7.5-4.5-9.5-9.2C1 8.4 3 5 6.4 5c2 0 3.4 1.1 4.4 2.5l1.2 1.6 1.2-1.6C14.2 6.1 15.6 5 17.6 5 21 5 23 8.4 21.5 11.8 19.5 16.5 12 21 12 21z"
              fill={isFav ? '#0072CE' : 'none'}
              stroke={isFav ? '#0072CE' : '#1A1A1A'}
              strokeWidth="1.6"
              strokeLinejoin="round" />
          </svg>
        </button>
      )}

      <div className="wiha-card__img">
        <img src={product.img} alt={product.name} onError={onImgErr} loading="lazy" />
      </div>

      <div className="wiha-card__type">{product.type}</div>
      <h3 className="wiha-card__name">{product.name}</h3>


      <div className="wiha-card__price-row">
        <div>
          <span className="wiha-card__price">${product.price.toFixed(0)}</span>
          {product.orig && <span className="wiha-card__orig">${product.orig.toFixed(0)}</span>}
        </div>
        {(product.reviews || 0) > 0 && (
          <span className="wiha-card__sku">{product.reviews.toLocaleString()} reviews</span>
        )}
      </div>
    </div>
  );
}

// ── Persona bar ──────────────────────────────────────────────
function PersonaBar({ persona, onChange, favoriteCount }) {
  const [scrolled, setScrolled] = React.useState(false);
  React.useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 200);
    window.addEventListener('scroll', onScroll, { passive: true });
    onScroll();
    return () => window.removeEventListener('scroll', onScroll);
  }, []);

  return (
    <>
      <div className="wiha-persona-bar">
        <div className="wiha-persona-bar__id">
          <span className="wiha-persona-eye">Visitor</span>
          <span className="wiha-persona-userid">{persona.userId}</span>
          {favoriteCount > 0 && (
            <span className="wiha-rank-chip" style={{ marginTop: 6 }}>
              <span className="wiha-rank-chip__dot" />
              {favoriteCount} saved → re-ranking
            </span>
          )}
        </div>

        <PortraitWithSignals persona={persona} />

        <div className="wiha-persona-bar__switch">
          <label>switch visitor</label>
          <select
            className="wiha-persona-bar__select"
            value={persona.id}
            onChange={(e) => onChange(e.target.value)}
          >
            {window.PERSONAS.map(p => (
              <option key={p.id} value={p.id}>
                {p.userId} · {p.chips[0]}
              </option>
            ))}
          </select>
        </div>
      </div>

      <div className={`wiha-persona-pill ${scrolled ? 'is-visible' : ''}`}>
        <div className="wiha-persona-pill__avatar">
          <img src={persona.img} alt={persona.name} />
        </div>
        <div className="wiha-persona-pill__meta">
          <span className="wiha-persona-pill__eye">Visitor</span>
          <span className="wiha-persona-pill__id">{persona.userId}</span>
        </div>
        <div className="wiha-persona-pill__chips">
          {(persona.signals || []).slice(0, 3).map((s, i) => (
            <span key={i} className={`wiha-persona-pill__chip wiha-persona-pill__chip--${s.tone || 'amber'}`}>
              {s.label}
            </span>
          ))}
        </div>
        <select
          className="wiha-persona-pill__select"
          value={persona.id}
          onChange={(e) => onChange(e.target.value)}
        >
          {window.PERSONAS.map(p => (
            <option key={p.id} value={p.id}>{p.userId}</option>
          ))}
        </select>
      </div>
    </>
  );
}

// ── Reason label ─────────────────────────────────────────────
function reasonFor(product, persona, favWeights) {
  if (favWeights) {
    const top = product.cats
      .map(c => ({ c, v: favWeights[c] || 0 }))
      .filter(x => x.v >= 0.5)
      .sort((a, b) => b.v - a.v)[0];
    if (top) return { text: `Matches saved: ${prettyCat(top.c)}`, kind: 'fav' };
  }
  const w = persona.weights;
  const top = product.cats
    .map(c => ({ c, v: w[c] || 0 }))
    .filter(x => x.v > 1.0)
    .sort((a, b) => b.v - a.v)[0];
  if (top) return { text: prettyCat(top.c), kind: 'fav' };
  return null;
}

function prettyCat(c) {
  const m = {
    'race-shoe': 'Race day shoe', 'everyday-shoe': 'Everyday trainer', 'trail-shoe': 'Trail running',
    'fitness-shoe': 'Fitness shoe', 'max-cushion': 'Max cushion', 'plush': 'Plush ride',
    'performance': 'Performance', 'responsive': 'Responsive', 'stable': 'Stability',
    'neutral': 'Neutral', 'balanced': 'Balanced', 'top': 'Run top', 'bottom': 'Run bottom',
    'sock': 'Run socks', 'outwear': 'Outwear', 'sports-bra': 'Sports bra',
    'accessory': 'Accessory', 'recovery': 'Recovery gear', 'race': 'Race day',
  };
  return m[c] || c;
}

Object.assign(window, { SideBySidePLP, ProductCard, PersonaBar, prettyCat });