"use client";

import { useState, useRef, useEffect, useMemo } from "react";
import { Search } from "lucide-react";
import { getProducts } from "@/content/products";
import Link from "next/link";
import Image from "next/image";
import { formatCurrency } from "@/lib/utils";
import { useRouter } from "next/navigation";

const allProducts = getProducts();

export function GlobalSearch() {
  const [query, setQuery] = useState("");
  const [isOpen, setIsOpen] = useState(false);
  const router = useRouter();
  
  const results = useMemo(() => {
    if (query.length < 2) return [];
    const q = query.toLowerCase();
    return allProducts
      .filter(p =>
        p.name.toLowerCase().includes(q) ||
        p.brand.toLowerCase().includes(q) ||
        p.category.toLowerCase().includes(q) ||
        (p.sku && p.sku.toLowerCase().includes(q))
      )
      .slice(0, 20);
  }, [query]);

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter' && query.length > 1) {
      router.push(`/sklep?search=${encodeURIComponent(query)}`);
      setIsOpen(false);
      setQuery('');
    }
  };

  return (
    <>
      <button
        onClick={() => setIsOpen(true)}
        className="p-2 text-primary hover:text-accent hover:bg-background rounded-lg transition-colors outline-none cursor-pointer"
        aria-label="Szukaj na stronie"
      >
        <Search className="size-5" />
      </button>

      <dialog className={`modal ${isOpen ? "modal-open" : ""}`}>
        <div className="modal-box p-0 max-w-2xl bg-white rounded-2xl overflow-hidden mt-[-20vh]">
          <div className="flex items-center border-b border-border px-4 py-3 bg-slate-50">
            <button aria-label="Szukaj" onClick={() => {
              if (query.length > 1) {
                router.push(`/sklep?search=${encodeURIComponent(query)}`);
                setIsOpen(false);
                setQuery('');
              }
            }}>
              <Search className="size-5 text-accent mr-3 shrink-0 hover:text-primary transition-colors cursor-pointer" />
            </button>
            <input
              autoFocus
              type="text"
              placeholder="Wpisz nazwę klimatyzatora (np. Rotenso, Pular)..."
              className="flex-1 outline-none text-base placeholder:text-text-muted/50 bg-transparent py-2 text-primary font-medium"
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              onKeyDown={handleKeyDown}
            />
            <button type="button" onClick={() => setIsOpen(false)} className="text-xs font-semibold text-text-muted hover:text-primary transition-colors bg-white px-2 py-1 rounded border border-border shadow-sm">
              ESC
            </button>
          </div>
          
          {query.length > 1 ? (
            <div className="max-h-[60vh] overflow-y-auto p-2 bg-white">
              {results.length > 0 ? (
                <div className="flex flex-col gap-1">
                  {results.map((product) => (
                    <Link
                      key={product.slug}
                      href={`/sklep/${product.slug}`}
                      onClick={() => setIsOpen(false)}
                      className="flex items-center gap-4 p-3 hover:bg-slate-50 rounded-lg transition-colors group border border-transparent hover:border-border"
                    >
                      <div className="w-16 h-16 bg-white border border-border rounded-md overflow-hidden relative shrink-0">
                        <Image 
                          src={product.image || 'https://images.unsplash.com/photo-1621905251189-08b45d6a269e?w=800&q=80'} 
                          alt={product.name} 
                          fill 
                          className="object-contain p-1 mix-blend-multiply" 
                        />
                      </div>
                      <div className="flex-1 flex flex-col">
                        <span className="text-[10px] font-bold text-text-muted uppercase tracking-wider">{product.brand}</span>
                        <span className="text-sm font-semibold text-primary group-hover:text-accent transition-colors">{product.name}</span>
                        <span className="text-xs text-text-muted mt-0.5">{product.specs?.['Moc chłodnicza'] ? `${product.specs['Moc chłodnicza']} kW • ` : ''}{product.category}</span>
                      </div>
                      <div className="text-right">
                        <span className="text-sm font-bold text-primary block">{product.price !== null ? formatCurrency(product.price) : 'Zapytaj o cenę'}</span>
                      </div>
                    </Link>
                  ))}
                </div>
              ) : (
                <div className="p-8 text-center text-text-muted">
                  Brak wyników dla <span className="font-semibold">"{query}"</span>
                </div>
              )}
            </div>
          ) : (
            <div className="p-8 text-center text-text-muted/50 text-sm bg-white">
              Wpisz co najmniej 2 znaki, aby rozpocząć wyszukiwanie w sklepie
            </div>
          )}
        </div>
        <form method="dialog" className="modal-backdrop">
          <button onClick={() => setIsOpen(false)}>close</button>
        </form>
      </dialog>
    </>
  );
}