import React from "react";
import { Link, NavLink, Route, Routes, useLocation } from "react-router-dom";
import Timer from "./components/Timer";
import ShowsPage from "./pages/ShowsPage";
import TimeSyncNotice from "./components/TimeSyncNotice";
import { ToastViewport } from "./components/Toasts";
import DebugOverlay from "./components/DebugOverlay";
import "./index.css";

const TIME_SYNC_OFF_THRESHOLD = 100;

export default function App() {
  const [open, setOpen] = React.useState(false);
  const loc = useLocation();

  // close sidebar on route change
  React.useEffect(() => setOpen(false), [loc.pathname]);

  // ESC to close
  React.useEffect(() => {
    const onKey = (e: KeyboardEvent) => e.key === "Escape" && setOpen(false);
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, []);

  return (
    <div className={`site ${open ? "sidebar-open" : ""}`}>
      {/* Top-left header (outside the card) */}
      <header className="site-header">

        <button className="burger" aria-label="メニュー" onClick={() => setOpen(v => !v)}>
          <svg className="burger-icon" viewBox="0 0 24 24" width="22" height="22" aria-hidden="true">
            <path d="M4 7h16M4 12h16M4 17h16"
              stroke="currentColor" strokeWidth="2"
              strokeLinecap="round" strokeLinejoin="round" fill="none" />
          </svg>
        </button>
        <Link to="/" className="brand">Watch Party</Link>
      </header>
      {/* Time sync banner (checks every 5 min; shows if |skew| > 500ms) */}
      <TimeSyncNotice thresholdMs={TIME_SYNC_OFF_THRESHOLD} lang="ja" />

      {/* Sidebar (full-height) */}
      <aside className={`sidebar ${open ? "open" : ""}`} aria-hidden={!open}>
        <nav className="sidebar-nav" onClick={() => setOpen(false)}>
          <NavLink end to="/" className="navlink">Timer</NavLink>
          <NavLink to="/shows" className="navlink">Shows</NavLink>
        </nav>
      </aside>

      {/* Backdrop for overlap mode or to close on click */}
      <button
        className={`backdrop ${open ? "open" : ""}`}
        aria-hidden={!open}
        onClick={() => setOpen(false)}
        tabIndex={-1}
      />

      {/* Main content area (card inside) */}
      <main className="site-content">
        <div className="card">
          <Routes>
            <Route path="/" element={<Timer />} />
            <Route path="/shows" element={<ShowsPage />} />
          </Routes>

          <div className="footer">
            Built by{" "}
            <a href="https://x.com/nik4nao" target="_blank" rel="noopener noreferrer">
              @nik4nao
            </a>{" "}
            — contact for inquiries or requirements.
          </div>
        </div>
      </main>
      <ToastViewport />
      <DebugOverlay />
    </div>
  );
}