/**
 * @component QuickViewModal
 * @purpose Product Quick View modal dialog previewing images, dynamic variant selection, pricing, specs, and Add to Cart action.
 * @a11y ARIA modal role, escape listener
 * @dependencies cartStore, catalogService, lucide-react
 */
'use client';

import { useState } from 'react';
import Image from 'next/image';
import { X, Star, ShoppingBag, Check, ShieldCheck, Truck } from 'lucide-react';
import { useCartStore } from '@/store/cartStore';
import { formatCurrency, getImageUrl } from '@/lib/utils';

export function QuickViewModal() {
  const product = useCartStore((state) => state.quickViewProduct);
  const setQuickViewProduct = useCartStore((state) => state.setQuickViewProduct);
  const addToCart = useCartStore((state) => state.addToCart);

  const [selectedVariantIndex, setSelectedVariantIndex] = useState(0);
  const [added, setAdded] = useState(false);

  if (!product) return null;

  const variant = product.variants[selectedVariantIndex] || product.variants[0];
  const mainImage = getImageUrl(product.images[0]?.image_url);
  const price = variant?.price || 0;
  const comparePrice = variant?.compare_price;

  const handleAddToCart = () => {
    addToCart(product, variant, 1);
    setAdded(true);
    setTimeout(() => setAdded(false), 2000);
  };

  return (
    <div className="fixed inset-0 z-50 overflow-y-auto flex items-center justify-center p-4">
      {/* Backdrop */}
      <div
        onClick={() => setQuickViewProduct(null)}
        className="fixed inset-0 bg-black/60 backdrop-blur-xs animate-in fade-in duration-200"
      />

      {/* Modal Dialog Box */}
      <div className="relative bg-white rounded-2xl shadow-2xl max-w-3xl w-full p-6 overflow-hidden z-10 animate-in zoom-in-95 duration-200 border border-gray-200">
        <button
          onClick={() => setQuickViewProduct(null)}
          className="absolute top-4 right-4 p-1 text-gray-400 hover:text-gray-600 rounded-full hover:bg-gray-100 transition-colors z-20"
        >
          <X className="w-5 h-5" />
        </button>

        <div className="grid grid-cols-1 md:grid-cols-2 gap-6 items-center">
          {/* Left Gallery Image */}
          <div className="relative h-64 md:h-80 rounded-xl bg-gray-50 overflow-hidden border border-gray-200">
            {mainImage ? (
              <Image
                src={mainImage}
                alt={product.name}
                fill
                className="object-cover"
              />
            ) : (
              <div className="w-full h-full flex items-center justify-center text-xs text-gray-400">No Image</div>
            )}
          </div>

          {/* Right Product Specifications */}
          <div className="flex flex-col justify-between h-full">
            <div>
              <span className="text-[10px] font-bold text-[#e4382f] uppercase tracking-wider">
                Quick Preview
              </span>
              <h3 className="text-lg font-extrabold text-[#1b2559] mt-1 leading-snug">
                {product.name}
              </h3>

              <div className="flex items-center gap-1 text-amber-400 text-xs mt-2 mb-3">
                {Array.from({ length: 5 }).map((_, i) => (
                  <Star key={i} className="w-3.5 h-3.5 fill-current" />
                ))}
                <span className="text-gray-400 text-[11px] ml-1 font-medium">(42 Reviews)</span>
              </div>

              <div className="flex items-baseline gap-2 mb-4">
                <span className="text-2xl font-black text-[#e4382f]">{formatCurrency(price)}</span>
                {comparePrice && (
                  <span className="text-sm text-gray-400 line-through">
                    {formatCurrency(comparePrice)}
                  </span>
                )}
              </div>

              <p className="text-xs text-gray-600 leading-relaxed mb-4">
                {product.description}
              </p>

              {/* Variant Selector */}
              {product.variants.length > 1 && (
                <div className="mb-4">
                  <label className="block text-xs font-bold text-[#1b2559] mb-1.5">
                    Select Variant:
                  </label>
                  <div className="flex flex-wrap gap-2">
                    {product.variants.map((v, idx) => (
                      <button
                        key={v.variant_id}
                        onClick={() => setSelectedVariantIndex(idx)}
                        className={`px-3 py-1.5 text-xs font-bold rounded-lg border transition-all ${
                          selectedVariantIndex === idx
                            ? 'border-[#e4382f] bg-red-50 text-[#e4382f]'
                            : 'border-gray-200 hover:border-gray-300 text-gray-700'
                        }`}
                      >
                        {v.sku} - {formatCurrency(v.price)}
                      </button>
                    ))}
                  </div>
                </div>
              )}
            </div>

            <div>
              <div className="flex items-center gap-4 text-[11px] text-gray-500 mb-4 border-t border-b border-gray-100 py-2">
                <span className="flex items-center gap-1"><Truck className="w-3.5 h-3.5 text-[#e4382f]" /> Free Express Shipping</span>
                <span className="flex items-center gap-1"><ShieldCheck className="w-3.5 h-3.5 text-[#e4382f]" /> 1 Year Warranty</span>
              </div>

              <button
                onClick={handleAddToCart}
                className={`w-full py-3 rounded-lg font-bold text-xs flex items-center justify-center gap-2 transition-colors shadow-md cursor-pointer ${
                  added ? 'bg-[#01b574] text-white' : 'bg-[#e4382f] hover:bg-[#c92e26] text-white'
                }`}
              >
                {added ? (
                  <>
                    <Check className="w-4 h-4" /> Added to Cart!
                  </>
                ) : (
                  <>
                    <ShoppingBag className="w-4 h-4" /> Add to Cart Now
                  </>
                )}
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}