'use client';

import { useCompareStore } from '@/lib/compare-store';
import Image from 'next/image';
import Link from 'next/link';
import { X, ShoppingCart } from 'lucide-react';
import { useCartStore } from '@/lib/cart-store';
import { buttonClasses } from '@/components/ui/Button';


export default function PorownajPage() {
  const { items, removeItem } = useCompareStore();
  const addToCart = useCartStore((s) => s.addItem);

  if (items.length === 0) {
    return (
      <main className="min-h-screen bg-slate-50 flex items-center justify-center">
        <div className="text-center">
          <p className="text-text-muted mb-4">Nie masz żadnych produktów do porównania.</p>
          <Link href="/sklep" className={buttonClasses({ variant: 'primary', size: 'md' })}>
Wróć do sklepu
</Link>
        </div>
      </main>
    );
  }

  const allSpecKeys = [...new Set(items.flatMap((i) => Object.keys(i.specs)))];

  return (
    <main className="bg-slate-50 min-h-screen py-8">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex items-center justify-between mb-8">
          <h1 className="text-2xl font-bold text-primary font-heading">Porównanie produktów</h1>
          <Link href="/sklep" className="text-sm text-accent hover:underline">← Wróć do sklepu</Link>
        </div>

        <div className="overflow-x-auto">
          <table className="w-full bg-white rounded-xl border border-border overflow-hidden">
            <thead>
              <tr className="border-b border-border">
                <td className="p-4 w-36 bg-slate-50" />
                {items.map((item) => (
                  <td key={item.slug} className="p-4 text-center align-top border-l border-border">
                    <div className="relative mx-auto size-24 mb-3">
                      <Image
                        src={item.image}
                        alt={item.name}
                        fill
                        className="object-contain"
                        unoptimized={item.image.startsWith('http')}
                      />
                    </div>
                    <p className="text-xs text-accent font-semibold uppercase mb-1">{item.brand}</p>
                    <p className="text-sm font-bold text-primary font-heading leading-snug">{item.name}</p>
                    {item.price && (
                      <p className="text-lg font-bold text-primary mt-2">
                        {item.price.toLocaleString('pl-PL')} zł
                      </p>
                    )}
                    <div className="flex gap-2 mt-3 justify-center">
                      {item.price && (
                        <button
                          onClick={() => addToCart({
                            slug: item.slug,
                            name: item.name,
                            brand: item.brand,
                            image: item.image,
                            price: item.price!,
                          })}
                          className="flex items-center gap-1 px-3 py-1.5 bg-accent text-white rounded-lg text-xs font-bold hover:bg-accent/90 transition-colors"
                        >
                          <ShoppingCart className="size-3" /> Do koszyka
                        </button>
                      )}
                      <button
                        onClick={() => removeItem(item.slug)}
                        className="p-1.5 text-text-muted hover:text-primary border border-border rounded-lg transition-colors"
                      >
                        <X className="size-3.5" />
                      </button>
                    </div>
                  </td>
                ))}
              </tr>
            </thead>
            <tbody>
              {allSpecKeys.map((key, idx) => (
                <tr key={key} className={`border-b border-border ${idx % 2 === 0 ? 'bg-white' : 'bg-slate-50'}`}>
                  <td className="p-3 text-xs font-medium text-text-muted bg-slate-50 border-r border-border">
                    {key}
                  </td>
                  {items.map((item) => (
                    <td key={item.slug} className="p-3 text-sm text-primary text-center border-l border-border">
                      {item.specs[key] || <span className="text-border">—</span>}
                    </td>
                  ))}
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>
    </main>
  );
}