"use client";

import { useState, useEffect, useMemo } from "react";
import Link from "next/link";
import { Search } from "lucide-react";
import { useRouter } from "next/navigation";
import { cn } from "@/lib/utils";

type Asset = {
  id: string;
  code: string;
  name: string;
  category: string;
  supplier: string;
};

export function GlobalSearch({ assets }: { assets: Asset[] }) {
  const [query, setQuery] = useState("");
  const [open, setOpen] = useState(false);
  const router = useRouter();

  const matches = useMemo(() => {
    const q = query.trim().toLowerCase();
    if (q.length < 2) return [];
    return assets
      .filter(
        (a) =>
          a.code.toLowerCase().includes(q) ||
          a.name.toLowerCase().includes(q) ||
          (a.supplier || "").toLowerCase().includes(q)
      )
      .slice(0, 8);
  }, [query, assets]);

  return (
    <div className="relative flex-1 min-w-0 max-w-md">
      <div className="relative">
        <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400 dark:text-text-soft pointer-events-none" />
        <input
          value={query}
          onChange={(e) => {
            setQuery(e.target.value);
            setOpen(true);
          }}
          onFocus={() => setOpen(true)}
          onBlur={() => setTimeout(() => setOpen(false), 150)}
          onKeyDown={(e) => {
            if (e.key === "Enter" && matches[0]) {
              router.push(`/income?asset=${matches[0].id}`);
              setOpen(false);
              setQuery("");
            }
          }}
          aria-label="Search plant, supplier or code"
          placeholder="Search plant…"
          className="w-full h-11 pl-9 pr-3 bg-gray-100 dark:bg-white/5 border border-transparent rounded-lg text-sm placeholder:text-gray-400 dark:placeholder:text-gray-500 focus:bg-white dark:focus:bg-white/10 focus:border-[#30638E] focus:outline-none transition"
        />
      </div>

      {open && matches.length > 0 && (
        <div className="absolute top-full left-0 right-0 mt-2 bg-white dark:bg-surface border border-gray-100 dark:border-white/10 rounded-xl shadow-lg overflow-hidden z-50">
          {matches.map((a) => (
            <Link
              key={a.id}
              href={`/income?asset=${a.id}`}
              onClick={() => {
                setOpen(false);
                setQuery("");
              }}
              className={cn(
                "flex items-center gap-3 px-4 py-2.5 hover:bg-gray-50 dark:hover:bg-white/5 text-sm border-b border-gray-50 dark:border-border last:border-0"
              )}
            >
              {a.code ? (
                <span className="font-mono text-xs px-2 py-0.5 rounded bg-[#00798C]/10 text-[#00798C] font-semibold shrink-0">
                  {a.code}
                </span>
              ) : (
                <span className="text-[10px] px-2 py-0.5 rounded bg-gray-100 dark:bg-white/5 text-gray-400 shrink-0">
                  no code
                </span>
              )}
              <div className="flex-1 min-w-0">
                <div className="font-medium text-[#003D5B] dark:text-white truncate">{a.name}</div>
                {a.supplier && (
                  <div className="text-xs text-gray-500 dark:text-gray-400 truncate">{a.supplier}</div>
                )}
              </div>
              {a.category && (
                <span className="text-[10px] uppercase tracking-wider text-gray-400 dark:text-text-soft shrink-0">
                  {a.category}
                </span>
              )}
            </Link>
          ))}
        </div>
      )}
    </div>
  );
}