"use client";

import { useAuth } from "@/lib/auth";
import { useTheme } from "./ThemeProvider";
import Link from "next/link";
import { useRouter } from "next/navigation";

export default function Header() {
  const { user, logout, token } = useAuth();
  const { theme, toggleTheme } = useTheme();
  const router = useRouter();

  function handleLogout() {
    logout();
    router.push("/login");
  }

  return (
    <header className="sticky top-0 z-50 bg-white/80 dark:bg-gray-950/80 backdrop-blur-md border-b border-gray-200 dark:border-gray-800">
      <div className="max-w-4xl mx-auto px-4 h-14 flex items-center justify-between">
        <Link href="/tasks" className="text-lg font-bold tracking-tight">
          Task Team
        </Link>

        <div className="flex items-center gap-3">
          <button
            onClick={toggleTheme}
            className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors"
            aria-label="Prepnout tema"
          >
            {theme === "dark" ? (
              <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z" />
              </svg>
            ) : (
              <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z" />
              </svg>
            )}
          </button>

          {token && user ? (
            <div className="flex items-center gap-2">
              <span className="text-sm text-muted hidden sm:inline">{user.name || user.email}</span>
              <button
                onClick={handleLogout}
                className="text-sm px-3 py-1.5 rounded-lg border border-gray-300 dark:border-gray-600 hover:bg-gray-50 dark:hover:bg-gray-800 transition-colors"
              >
                Odhlasit
              </button>
            </div>
          ) : (
            <Link
              href="/login"
              className="text-sm px-3 py-1.5 rounded-lg bg-blue-600 text-white hover:bg-blue-700 transition-colors"
            >
              Prihlasit
            </Link>
          )}
        </div>
      </div>
    </header>
  );
}