import { Link, useMatchRoute, useNavigate } from "@tanstack/react-router";
import { useState } from "react";
import { useTranslation } from "react-i18next";
import { useAuth } from "../hooks/useAuth";
import { LucideIcon } from "../lib/iconData";
import { useUIStore } from "../stores/uiStore";
import { UserMenu } from "./UserMenu";

interface NavLinkOrButtonProps {
	to: string;
	isActive: boolean;
	isProtected: boolean;
	isAuthenticated: boolean;
	onAuthPrompt: () => void;
	children: React.ReactNode;
}

function NavLinkOrButton({
	to,
	isActive,
	isProtected,
	isAuthenticated,
	onAuthPrompt,
	children,
}: NavLinkOrButtonProps) {
	const activeClass = "text-gray-900 font-medium";
	const inactiveClass = "text-gray-500 hover:text-gray-700 transition-colors";
	const className = `text-sm ${isActive ? activeClass : inactiveClass}`;

	if (isProtected && !isAuthenticated) {
		return (
			<button type="button" onClick={onAuthPrompt} className={className}>
				{children}
			</button>
		);
	}

	return (
		<Link to={to} className={className}>
			{children}
		</Link>
	);
}

export function TopNav() {
	const { t } = useTranslation();
	const { data: auth } = useAuth();
	const isAuthenticated = !!auth?.user;
	const openAuthPrompt = useUIStore((s) => s.openAuthPrompt);
	const matchRoute = useMatchRoute();
	const navigate = useNavigate();
	const [searchQuery, setSearchQuery] = useState("");

	const isHome = !!matchRoute({ to: "/" });
	const isCollection = !!matchRoute({ to: "/collection", fuzzy: true });
	const isSetups = !!matchRoute({ to: "/setups", fuzzy: true });

	function handleSearch() {
		const trimmed = searchQuery.trim();
		if (!trimmed) return;
		navigate({ to: "/global-items", search: { q: trimmed } });
		setSearchQuery("");
	}

	return (
		<div className="sticky top-0 z-10 bg-white border-b border-gray-100">
			<div className="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
				<div className="flex items-center justify-between h-14">
					{/* Left: Logo */}
					<Link
						to="/"
						className="text-lg font-semibold text-gray-900 hover:text-gray-600 transition-colors flex items-center gap-2"
					>
						<LucideIcon name="package" size={20} className="text-gray-500" />
						GearBox
					</Link>

					{/* Center: Desktop nav links */}
					<nav className="hidden md:flex items-center gap-6">
						<NavLinkOrButton
							to="/"
							isActive={isHome}
							isProtected={false}
							isAuthenticated={isAuthenticated}
							onAuthPrompt={openAuthPrompt}
						>
							{t("nav.home")}
						</NavLinkOrButton>
						<NavLinkOrButton
							to="/collection"
							isActive={isCollection}
							isProtected={true}
							isAuthenticated={isAuthenticated}
							onAuthPrompt={openAuthPrompt}
						>
							{t("nav.collection")}
						</NavLinkOrButton>
						<NavLinkOrButton
							to="/setups"
							isActive={isSetups}
							isProtected={true}
							isAuthenticated={isAuthenticated}
							onAuthPrompt={openAuthPrompt}
						>
							{t("nav.setups")}
						</NavLinkOrButton>
					</nav>

					{/* Right: Search bar (desktop only) + User section */}
					<div className="flex items-center gap-3">
						{/* Search bar — desktop only */}
						<div className="relative hidden md:flex items-center">
							<button
								type="button"
								onClick={handleSearch}
								className="absolute left-2.5 top-1/2 -translate-y-1/2 text-gray-400 hover:text-gray-600 transition-colors"
								tabIndex={-1}
								aria-label="Search"
							>
								<LucideIcon name="search" size={16} />
							</button>
							<input
								type="text"
								value={searchQuery}
								onChange={(e) => setSearchQuery(e.target.value)}
								onKeyDown={(e) => {
									if (e.key === "Enter") handleSearch();
								}}
								placeholder={t("nav.searchPlaceholder")}
								className="bg-gray-50 border border-gray-200 rounded-lg pl-9 pr-3 py-2 text-sm text-gray-900 placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-gray-200 focus:border-gray-300 w-48 lg:w-64 transition-colors"
							/>
						</div>

						{/* User section */}
						{isAuthenticated ? (
							<UserMenu />
						) : (
							<Link
								to="/login"
								className="text-xs text-gray-500 hover:text-gray-700 transition-colors"
							>
								{t("auth.signIn")}
							</Link>
						)}
					</div>
				</div>
			</div>
		</div>
	);
}