"use client";

import React, { useEffect, useRef, useState } from 'react';
import { useRouter } from 'next/navigation';
import { Check, ChevronDown, LayoutGrid, Search } from 'lucide-react';
import { catalogService } from '@/services/api/catalogService';

export const SearchBar: React.FC = () => {
  const router = useRouter();
  const [category, setCategory] = useState('All Categories');
  const [categories, setCategories] = useState<string[]>(['All Categories']);
  const [searchQuery, setSearchQuery] = useState('');
  const [open, setOpen] = useState(false);
  const [catQuery, setCatQuery] = useState('');
  const rootRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    catalogService.getCategories().then((res) => {
      if (res && res.length > 0) {
        setCategories(['All Categories', ...res.map((c) => c.name)]);
      }
    });
  }, []);

  useEffect(() => {
    const onDoc = (event: MouseEvent) => {
      if (!rootRef.current?.contains(event.target as Node)) setOpen(false);
    };
    const onKey = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setOpen(false);
    };
    document.addEventListener('mousedown', onDoc);
    document.addEventListener('keydown', onKey);
    return () => {
      document.removeEventListener('mousedown', onDoc);
      document.removeEventListener('keydown', onKey);
    };
  }, []);

  const filtered = catQuery.trim()
    ? categories.filter((name) =>
        name.toLowerCase().includes(catQuery.trim().toLowerCase())
      )
    : categories;

  const handleSearchSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    const catQueryParam =
      category === 'All Categories' ? '' : `category=${encodeURIComponent(category)}`;
    const searchQueryStr = searchQuery.trim()
      ? `search=${encodeURIComponent(searchQuery.trim())}`
      : '';
    const queryParts = [catQueryParam, searchQueryStr].filter(Boolean).join('&');
    const path = queryParts ? `/shop?${queryParts}` : '/shop';
    router.push(path);
  };

  return (
    <form
      onSubmit={handleSearchSubmit}
      className="flex flex-1 max-w-[720px] items-center bg-white rounded-lg border border-gray-200 overflow-visible shadow-sm h-[46px] relative"
    >
      <div ref={rootRef} className="relative h-full hidden lg:block">
        <button
          type="button"
          onClick={() => setOpen((value) => !value)}
          className={`h-full min-w-[160px] max-w-[200px] px-3.5 border-r border-gray-200 rounded-l-lg inline-flex items-center gap-2 text-left transition ${
            open
              ? 'bg-primary/5 text-primary'
              : 'bg-gray-50 text-[#1a1a1a] hover:bg-gray-100'
          }`}
        >
          <LayoutGrid className="w-3.5 h-3.5 shrink-0 text-primary" />
          <span className="flex-1 text-[12px] font-semibold truncate">{category}</span>
          <ChevronDown
            size={14}
            className={`shrink-0 transition-transform ${
              open ? 'rotate-180 text-primary' : 'text-gray-400'
            }`}
          />
        </button>

        {open && (
          <div className="absolute left-0 top-[calc(100%+8px)] w-[280px] bg-white border border-gray-200 rounded-xl shadow-[0_12px_32px_rgba(15,23,42,0.12)] overflow-hidden z-[130]">
            <div className="p-2 border-b border-gray-100">
              <div className="relative">
                <Search className="w-3.5 h-3.5 text-gray-400 absolute left-3 top-1/2 -translate-y-1/2" />
                <input
                  type="text"
                  value={catQuery}
                  onChange={(e) => setCatQuery(e.target.value)}
                  placeholder="Search categories..."
                  className="w-full h-9 pl-8 pr-3 rounded-lg bg-gray-50 border border-gray-200 text-[12px] outline-none focus:border-primary focus:ring-2 focus:ring-primary/15"
                />
              </div>
            </div>
            <ul className="max-h-72 overflow-y-auto py-1">
              {filtered.map((cat) => {
                const isSelected = category === cat;
                return (
                  <li key={cat}>
                    <button
                      type="button"
                      onClick={() => {
                        setCategory(cat);
                        setOpen(false);
                        setCatQuery('');
                      }}
                      className={`w-full px-3.5 py-2.5 flex items-center gap-2.5 text-left text-[13px] transition ${
                        isSelected
                          ? 'bg-primary/5 text-primary font-semibold'
                          : 'text-[#1a1a1a] hover:bg-gray-50'
                      }`}
                    >
                      <span className="flex-1 truncate">{cat}</span>
                      {isSelected ? <Check className="w-4 h-4 shrink-0" /> : null}
                    </button>
                  </li>
                );
              })}
            </ul>
          </div>
        )}
      </div>

      <input
        type="text"
        placeholder="Search products..."
        value={searchQuery}
        onChange={(e) => setSearchQuery(e.target.value)}
        className="flex-1 px-4 text-[13px] text-gray-800 placeholder-gray-400 focus:outline-none h-full font-medium"
      />

      <button
        type="submit"
        className="h-full bg-primary hover:brightness-95 text-white px-7 flex items-center justify-center font-bold text-sm transition-colors rounded-r-lg"
        title="Search"
      >
        Search
      </button>
    </form>
  );
};