'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import LogoutButton from '@/components/LogoutButton';
import packageJson from '@/package.json';

interface TabLayoutProps {
  children: React.ReactNode;
}

const TABS = [
  { href: '/', label: 'Eingabe' },
  { href: '/charts', label: 'Verlauf' },
  { href: '/einstellungen', label: 'Einstellungen' },
];

export default function TabLayout({ children }: TabLayoutProps) {
  const pathname = usePathname();
  const version = packageJson.version;
  const buildDate = process.env.NEXT_PUBLIC_BUILD_DATE || new Date().toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' });

  return (
    <div className="min-h-screen py-8 px-4">
      {/* Outer wrapper: ~10% wider than the inner max-w-6xl (72rem → ~79rem), with border */}
      <div className="max-w-316 mx-auto border-2 border-black rounded-xl bg-gray-200 p-6">

        {/* Page title */}
        <h1 className="text-4xl font-bold text-center mb-6 tracking-tight">Werte-Log</h1>

        {/* Inner content constrained to max-w-6xl */}
        <div className="max-w-6xl mx-auto">

        {/* Tab bar */}
        <div className="flex justify-between items-end">
          <div className="flex">
            {TABS.map(tab => {
              const isActive = pathname === tab.href;
              return (
                <Link
                  key={tab.href}
                  href={tab.href}
                  className="px-6 py-2 text-sm font-semibold border-t-2 border-l-2 border-r-2 rounded-tl-lg rounded-tr-lg mr-1 transition-colors"
                  style={
                    isActive
                      ? { backgroundColor: '#FFFFDD', color: '#000000', borderColor: '#000000', borderBottom: '2px solid #FFFFDD', marginBottom: '-2px', position: 'relative', zIndex: 10 }
                      : { backgroundColor: '#85B7D7', color: '#374151', borderColor: '#000000' }
                  }
                >
                  {tab.label}
                </Link>
              );
            })}
          </div>
          <div className="pb-1">
            <LogoutButton className="px-4 py-2 bg-red-600 hover:bg-red-700 text-white text-sm rounded-lg shadow-md" />
          </div>
        </div>

        {/* Content panel */}
        <main className="border-2 border-black rounded-b-lg rounded-tr-lg p-6 bg-[#FFFFDD]">
          {children}
        </main>
          <footer className="mt-8 flex justify-between items-center text-sm text-gray-600 px-4">
            <a href="mailto:rxf@gmx.de" className="hover:underline">
              mailto:rxf@gmx.de
            </a>
            <div>Version {version} - {buildDate}</div>
          </footer>

        </div>
      </div>
    </div>
  );
}
