// Best Sellers PLP — side-by-side: Ernesta today (fixed order) vs With Malachyte (personalized)

// =========================================================================
// Top-level: side-by-side comparison
// =========================================================================
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>
  );
}

// =========================================================================
// One side of the side-by-side
// =========================================================================
function PLPColumn({ mode, state, persona, favorites, onFav }) {
  const pool = window.PRODUCTS.filter(p => p.cats.includes('bestseller-plp'));
  const favWeights = window.buildFavWeights ? window.buildFavWeights(favorites) : null;
  const ranked = mode === 'malachyte'
    ? window.rankProducts(pool, persona, favWeights)
    : window.defaultOrder(pool);

  const handleImgErr = (e) => { e.target.src = window.PRODUCT_FALLBACK; };
  const isMal = mode === 'malachyte';

  return (
    <div className={`sbs-col sbs-col--${mode}`}>
      <div className="sbs-col__head">
        <span className="sbs-col__tag">{isMal ? 'AFTER' : 'BEFORE'}</span>
        <img
          src={isMal ? 'assets/malachyte-logo-gradient.png' : 'assets/ernesta-logo.png'}
          alt={isMal ? 'Malachyte' : 'Ernesta'}
          className={`sbs-col__logo sbs-col__logo--${isMal ? 'mal' : 'wiha'}`}
        />
        <span className="sbs-col__caption">{isMal ? 'With Malachyte' : 'Ernesta 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">
            ernestarugs.com/collections/best-sellers{isMal ? ' · personalized by malachyte' : ''}
          </div>
        </div>

        <ErnestaChrome />

        <div className="wiha-plp-root">
          <div className="wiha-crumbs">
            <a>Home</a><span className="sep">/</span><a>Rugs</a><span className="sep">/</span><span className="current">Best Sellers</span>
          </div>

          <h1 className="wiha-plp-title">Best Sellers</h1>
          <p className="wiha-plp-sub">Our most-loved rugs — wool, natural fiber, performance &amp; indoor/outdoor.</p>

          <div className="sbs-toolbar">
            <span className="sbs-toolbar__count">{ranked.length} rugs</span>
            <span className="sbs-toolbar__static">{isMal ? 'Sort · Recommended for you' : 'Sort · Best selling'}</span>
          </div>

          <div className={`wiha-grid-wrap wiha-grid-wrap--${mode}`}>
            <div className="wiha-grid-railbar">
              <span className="wiha-grid-railbar__dot" />
              {isMal
                ? <>PERSONALIZED · RANKED FOR <b>{persona.userId}</b></>
                : <>STATIC · SAME ORDER FOR EVERY VISITOR</>}
            </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 (rug)
// =========================================================================
function ProductCard({ product, index, mode, persona, favWeights, isFav, onFav, onImgErr }) {
  const isMal = mode === 'malachyte';
  const showRank = isMal && index < 8;

  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 favorite' : 'Add favorite'}
        >
          <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 ? '#A8593C' : 'none'} stroke={isFav ? '#A8593C' : '#2A2620'} strokeWidth="1.6" strokeLinejoin="round" />
          </svg>
        </button>
      )}

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

      <h3 className="wiha-card__name">{product.name}</h3>
      <div className="wiha-card__color">
        <span className="wiha-swatch" style={{ background: product.famHex }} />
        {product.color} · {product.type}
      </div>

      <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>
      </div>
    </div>
  );
}

function ReasonChip({ product, persona, favWeights }) {
  const reason = reasonFor(product, persona, favWeights);
  if (!reason) return null;
  return (
    <div className={`wiha-why ${reason.kind === 'anti' ? 'wiha-why--anti' : ''}`}>
      <span className="wiha-why__dot" />
      {reason.text}
    </div>
  );
}

// =========================================================================
// Persona bar — compact, sits above both columns
// =========================================================================
function PersonaBar({ persona, onChange, favoriteCount }) {
  const [scrolled, setScrolled] = React.useState(false);

  React.useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 220);
    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} ♥ → 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.name}</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)}
          title="Switch visitor"
        >
          {window.PERSONAS.map(p => (
            <option key={p.id} value={p.id}>{p.userId}</option>
          ))}
        </select>
      </div>
    </>
  );
}

// =========================================================================
// Why-this-product reason builder
// =========================================================================
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 your ♥ ${prettyCat(top.c)}`, kind: 'fav' };
  }
  const w = persona.weights;
  const top = product.cats
    .map(c => ({ c, v: w[c] || 0 }))
    .filter(x => x.v > 0.5)
    .sort((a, b) => b.v - a.v)[0];
  if (top) return { text: `Matches ${prettyCat(top.c)}`, kind: 'fav' };

  const neg = product.cats
    .map(c => ({ c, v: w[c] || 0 }))
    .filter(x => x.v < -0.4)
    .sort((a, b) => a.v - b.v)[0];
  if (neg) return { text: 'Off-profile', kind: 'anti' };
  return null;
}

function prettyCat(c) {
  const m = {
    blue: 'coastal blues',
    neutral: 'neutral tones',
    grey: 'cool greys',
    warm: 'warm earth tones',
    green: 'sage greens',
    wool: 'wool',
    'wool-blend': 'wool blend',
    plush: 'plush pile',
    lustrous: 'lustrous sheen',
    flatweave: 'flatweave',
    textural: 'textural weave',
    shag: 'shag pile',
    'natural-fiber': 'natural fiber',
    jute: 'jute',
    sisal: 'sisal',
    braided: 'braided',
    performance: 'performance',
    'pet-friendly': 'pet-friendly',
    washable: 'washable',
    'indoor-outdoor': 'indoor / outdoor',
    outdoor: 'outdoor',
    'under-300': 'under $300',
    '300-500': '$300–500',
    '500-700': '$500–700',
    '700-plus': '$700+',
  };
  return m[c] || c;
}

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