'use client'
import { useState, useEffect } from 'react'
import { useMedusaCart } from '@/hooks/useMedusaCart'
import type { MedusaProduct } from '@/hooks/useMedusaProducts'
import Link from 'next/link'
import { ShoppingBag, TrendingUp } from 'lucide-react'

const CURRENCY_SYMBOLS: Record<string, string> = { zar: 'R', usd: '$', eur: '€', gbp: '£', kes: 'KSh', ngn: '₦', ghs: '₵' }
const fmt = (amount: number, code?: string) => {
  const sym = CURRENCY_SYMBOLS[(code ?? '').toLowerCase()] ?? (code?.toUpperCase() ?? '')
  return `${sym}${(amount / 100).toFixed(2)}`
}

export default function MostPopularSection() {
  const [products, setProducts] = useState<MedusaProduct[]>([])
  const [loading, setLoading] = useState(true)
  const { addToCart } = useMedusaCart()

  useEffect(() => {
    fetch('/api/popular-products?limit=8')
      .then(r => r.ok ? r.json() : Promise.reject(r.status))
      .then(d => { setProducts(d.products ?? []); setLoading(false) })
      .catch(() => {
        fetch('/api/medusa/products?limit=8')
          .then(r => r.json())
          .then(d => { setProducts(d.products ?? []); setLoading(false) })
          .catch(() => setLoading(false))
      })
  }, [])

  if (loading) {
    return (
      <section className="py-20">
        <div className="container mx-auto px-4">
          <div className="grid grid-cols-2 md:grid-cols-4 gap-6">
            {Array.from({ length: 4 }).map((_, i) => (
              <div key={i} className="aspect-square rounded-xl bg-muted animate-pulse" />
            ))}
          </div>
        </div>
      </section>
    )
  }

  const featured = products.slice(0, 4)
  if (!featured.length) return null

  return (
    <section data-vula-section="mostpopular" className="py-20">
      <div className="container mx-auto px-4">
        <div className="flex items-center justify-between mb-10">
          <div className="flex items-center gap-3">
            <TrendingUp className="h-6 w-6 text-primary" />
            <div>
              <p className="text-xs uppercase tracking-widest text-primary font-semibold mb-1">Best Sellers</p>
              <h2 className="text-3xl font-bold text-foreground">Most Popular</h2>
            </div>
          </div>
          <Link href="/products" className="text-sm font-semibold text-primary hover:underline underline-offset-4 hidden md:inline-flex items-center gap-1">View all →</Link>
        </div>
        <div className="grid grid-cols-2 lg:grid-cols-4 gap-6">
          {featured.map((product, idx) => {
            const variant = product.variants?.[0]
            const price = variant?.prices?.[0]
            return (
              <div key={product.id} className="group bg-card rounded-xl overflow-hidden border border-border hover:shadow-md transition-all relative">
                {idx < 2 && (
                  <span className="absolute top-2 left-2 z-10 bg-primary text-primary-foreground text-xs font-semibold px-2 py-0.5 rounded-full">
                    #{ idx + 1 } Best Seller
                  </span>
                )}
                <Link href={`/products/${product.id}`} className="block overflow-hidden">
                  <div className="relative aspect-square bg-muted">
                    {product.thumbnail ? (
                      <img src={product.thumbnail} alt={product.title || ''} className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-300" />
                    ) : (
                      <div className="w-full h-full flex items-center justify-center">
                        <ShoppingBag className="h-8 w-8 text-muted-foreground/30" />
                      </div>
                    )}
                  </div>
                </Link>
                <div className="p-4">
                  <Link href={`/products/${product.id}`}>
                    <p className="text-sm font-semibold text-foreground line-clamp-2 mb-1 hover:text-primary transition-colors">{product.title}</p>
                  </Link>
                  {price && (
                    <p className="text-sm font-bold text-primary mb-3">{fmt(price.amount, price.currency_code)}</p>
                  )}
                  <button
                    onClick={() => { if (!variant?.id) return; addToCart(variant.id, 1); window.dispatchEvent(new CustomEvent('cart-drawer-open')) }}
                    disabled={!variant?.id}
                    className="w-full text-xs bg-primary/10 text-primary hover:bg-primary hover:text-primary-foreground py-2 rounded-lg transition-colors font-medium disabled:opacity-40"
                  >
                    Add to Cart
                  </button>
                </div>
              </div>
            )
          })}
        </div>
      </div>
    </section>
  )
}