"use client";

import { useState } from 'react'
import Link from 'next/link'
import { getCategoryImage, formatPrice, type Product } from '@homaroma/types'
import { useCartStore } from '../store/cartStore'
import { resolveCategoryName, resolveLocalized } from '../lib/localization'
import { useLang } from '../hooks/useLang'

interface Props {
  product: Product
}

export default function AddToCartSection({ product }: Props) {
  const [selectedVariant, setSelectedVariant] = useState(0)
  const { addToCart, toggleCart } = useCartStore()
  const lang = useLang()

  const currentVariant = product.variants[selectedVariant]
  const categoryName = resolveCategoryName(product.category, lang)
  const productName = resolveLocalized(product.name, lang) || product.scent.name
  const description = resolveLocalized(product.description, lang)

  const handleAddToCart = () => {
    if (!currentVariant) return

    addToCart({
      productId: product.id,
      variantId: currentVariant.id,
      quantity: 1,
      price: currentVariant.price || product.price || 0,
      productName,
      variantSize: currentVariant.size,
      productImage: product.images?.[0]?.url || product.category.imageUrl || getCategoryImage(categoryName),
    })
    toggleCart(true)
  }

  return (
    <>
      <div className="space-y-8">
        <div className="space-y-2">
          {categoryName && (
            <p className="text-xs font-bold uppercase tracking-[0.28em] text-pop-pink">
              {categoryName}
            </p>
          )}
          <h1 className="text-4xl font-semibold leading-tight text-pop-black md:text-6xl">
            {productName}
          </h1>
          <p className="text-sm font-semibold uppercase tracking-widest text-gray-500">
            Premium Collection
          </p>
        </div>

        {description && <p className="leading-relaxed text-gray-600">{description}</p>}

        <div className="flex items-baseline gap-3">
          <span className="text-4xl font-bold text-pop-pink">
            {formatPrice(currentVariant?.price ?? product.price)}
          </span>
          {currentVariant && <span className="text-sm text-gray-500">/ {currentVariant.size}</span>}
        </div>

        {product.variants.length > 0 && (
          <div className="space-y-3">
            <p className="text-xs font-bold uppercase tracking-widest text-gray-500">Select Size</p>
            <div className="flex flex-wrap gap-3">
              {product.variants.map((variant, index) => (
                <button
                  key={variant.id}
                  onClick={() => setSelectedVariant(index)}
                  className={`rounded-xl border px-5 py-3 text-sm font-bold uppercase tracking-widest transition ${
                    selectedVariant === index
                      ? 'border-pop-pink bg-pop-pink text-white shadow-brutal'
                      : 'border-gray-200 bg-white text-gray-600 hover:border-pop-pink hover:text-pop-pink'
                  }`}
                >
                  {variant.size}
                  <span className={`mt-1 block text-[10px] ${selectedVariant === index ? 'text-white/80' : 'text-gray-400'}`}>
                    {formatPrice(variant.price)}
                  </span>
                </button>
              ))}
            </div>
          </div>
        )}

        <div className="hidden gap-4 md:flex">
          <button
            onClick={handleAddToCart}
            className="flex-1 rounded-full bg-pop-black px-8 py-4 font-bold uppercase tracking-widest text-white transition hover:bg-pop-pink"
          >
            Add to Cart
          </button>
          {categoryName && (
            <Link
              href={`/category/${product.category.id}`}
              className="rounded-full border border-gray-200 bg-white px-8 py-4 font-bold uppercase tracking-widest text-gray-600 transition hover:border-pop-pink hover:text-pop-pink"
            >
              {categoryName}
            </Link>
          )}
        </div>

        <div className="grid grid-cols-2 gap-4 border-t border-gray-200 pt-6 text-sm text-gray-500">
          <div>
            <span className="mb-1 block text-xs font-bold uppercase tracking-widest text-gray-400">Scent</span>
            <span className="font-semibold text-pop-black">{product.scent.name}</span>
          </div>
          <div>
            <span className="mb-1 block text-xs font-bold uppercase tracking-widest text-gray-400">Category</span>
            <Link href={`/category/${product.category.id}`} className="font-semibold text-pop-black transition hover:text-pop-pink">
              {categoryName}
            </Link>
          </div>
        </div>
      </div>

      <div className="fixed bottom-0 left-0 right-0 z-40 border-t border-gray-200 bg-white/95 p-4 shadow-[0_-10px_30px_rgba(0,0,0,0.08)] backdrop-blur md:hidden">
        {product.variants.length > 1 && (
          <div className="mb-3 flex gap-2 overflow-x-auto pb-1" style={{ scrollbarWidth: 'none' }}>
            {product.variants.map((variant, index) => (
              <button
                key={`mobile-v-${variant.id}`}
                onClick={() => setSelectedVariant(index)}
                className={`flex-shrink-0 rounded-full border px-4 py-2 text-[10px] font-bold uppercase tracking-widest transition ${
                  selectedVariant === index
                    ? 'border-pop-pink bg-pop-pink text-white'
                    : 'border-gray-200 bg-white text-gray-500'
                }`}
              >
                {variant.size}
              </button>
            ))}
          </div>
        )}
        <div className="flex items-center justify-between gap-4">
          <div className="flex flex-col">
            <span className="text-[10px] font-bold uppercase tracking-widest text-gray-400">
              {product.variants.length > 1 ? currentVariant?.size : 'Total Price'}
            </span>
            <span className="text-xl font-bold text-pop-pink">{formatPrice(currentVariant?.price ?? product.price)}</span>
          </div>
          <button
            onClick={handleAddToCart}
            className="flex-1 rounded-full bg-pop-black px-5 py-3.5 font-bold uppercase tracking-widest text-white transition hover:bg-pop-pink"
          >
            Add to Cart
          </button>
        </div>
      </div>
    </>
  )
}