import { Link } from "@tanstack/react-router";
import { useAuth, useLogout } from "../hooks/useAuth";
import { useFormatters } from "../hooks/useFormatters";
import { useUpdateSetting } from "../hooks/useSettings";
import { useTotals } from "../hooks/useTotals";
import type { WeightUnit } from "../lib/formatters";
import { LucideIcon } from "../lib/iconData";

const UNITS: WeightUnit[] = ["g", "oz", "lb", "kg"];

interface TotalsBarProps {
	title?: string;
	stats?: Array<{ label: string; value: string }>;
	linkTo?: string;
}

export function TotalsBar({
	title = "GearBox",
	stats,
	linkTo,
}: TotalsBarProps) {
	const { data } = useTotals();
	const { data: auth } = useAuth();
	const logout = useLogout();
	const isAuthenticated = !!auth?.user;
	const { weight, price, unit } = useFormatters();
	const updateSetting = useUpdateSetting();

	// When no stats provided, use global totals (backward compatible)
	const displayStats =
		stats ??
		(data?.global
			? [
					{ label: "items", value: String(data.global.itemCount) },
					{
						label: "total",
						value: weight(data.global.totalWeight),
					},
					{ label: "spent", value: price(data.global.totalCost) },
				]
			: [
					{ label: "items", value: "0" },
					{ label: "total", value: weight(null) },
					{ label: "spent", value: price(null) },
				]);

	const titleContent = (
		<span className="flex items-center gap-2">
			<LucideIcon name="package" size={20} className="text-gray-500" />
			{title}
		</span>
	);

	const titleElement = linkTo ? (
		<Link
			to={linkTo}
			className="text-lg font-semibold text-gray-900 hover:text-gray-600 transition-colors"
		>
			{titleContent}
		</Link>
	) : (
		<h1 className="text-lg font-semibold text-gray-900">{titleContent}</h1>
	);

	// If stats prop is explicitly an empty array, show title only (dashboard mode)
	const showStats = stats === undefined || stats.length > 0;

	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">
					{titleElement}
					<div className="flex items-center gap-4">
						<div className="flex items-center gap-1 bg-gray-100 rounded-full px-1 py-0.5">
							{UNITS.map((u) => (
								<button
									key={u}
									type="button"
									onClick={() =>
										updateSetting.mutate({
											key: "weightUnit",
											value: u,
										})
									}
									className={`px-2 py-0.5 text-xs rounded-full transition-colors ${
										unit === u
											? "bg-white text-gray-700 shadow-sm font-medium"
											: "text-gray-400 hover:text-gray-600"
									}`}
								>
									{u}
								</button>
							))}
						</div>
						{showStats && (
							<div className="flex items-center gap-6 text-sm text-gray-500">
								{displayStats.map((stat) => (
									<span key={stat.label}>
										<span className="font-medium text-gray-700">
											{stat.value}
										</span>{" "}
										{stat.label}
									</span>
								))}
							</div>
						)}
						<div className="flex items-center gap-2 ml-auto">
							{isAuthenticated ? (
								<button
									type="button"
									onClick={() => logout.mutate()}
									className="text-xs text-gray-500 hover:text-gray-700 transition-colors"
								>
									Sign out
								</button>
							) : (
								<Link
									to="/login"
									className="text-xs text-gray-500 hover:text-gray-700 transition-colors"
								>
									Sign in
								</Link>
							)}
						</div>
					</div>
				</div>
			</div>
		</div>
	);
}