import { useEffect } from "react";
import { Navigate, Outlet, useLocation } from "react-router-dom";
import { useAuth } from "../auth/AuthContext";
import { AppPwaUpdateNotice } from "../components/common/AppPwaUpdateNotice";
import { ErrorBoundary } from "../components/common/ErrorBoundary";
import { MobileBottomNav } from "../components/mobile/MobileBottomNav";
import { Sidebar } from "../components/navigation/Sidebar";
import { Topbar } from "../components/navigation/Topbar";
import { resolvePageMeta } from "../features/navigation/schema";
import { writeRecentVisit } from "../lib/recentVisits";
import { resolveMobileEquivalentPath, shouldPreferMobileWorkplace } from "../lib/runtimeContext";

export function AppShellLayout() {
  const { permissions } = useAuth();
  const location = useLocation();
  const isMobileRoute = location.pathname.startsWith("/mobile");
  const mobileSearchParams = new URLSearchParams(location.search);
  const isMobileDeepRoute =
    /^\/mobile\/(?:reimbursements|approvals|leave|purchase-requests)\/[^/]+$/.test(location.pathname) ||
    (location.pathname === "/mobile/approvals" && mobileSearchParams.has("taskId"));
  const showMobileBottomNav = isMobileRoute && !isMobileDeepRoute;
  const mobileEquivalentPath = !isMobileRoute && shouldPreferMobileWorkplace()
    ? resolveMobileEquivalentPath(location.pathname, location.search)
    : null;

  useEffect(() => {
    if (!isMobileRoute || typeof window === "undefined") {
      return;
    }

    const updateViewportHeight = () => {
      const height = Math.max(320, Math.floor(window.visualViewport?.height ?? window.innerHeight));
      document.documentElement.style.setProperty("--mobile-viewport-height", `${height}px`);
    };

    updateViewportHeight();
    const frameId = window.requestAnimationFrame(updateViewportHeight);
    window.addEventListener("resize", updateViewportHeight);
    window.addEventListener("orientationchange", updateViewportHeight);
    window.visualViewport?.addEventListener("resize", updateViewportHeight);
    window.visualViewport?.addEventListener("scroll", updateViewportHeight);

    return () => {
      window.cancelAnimationFrame(frameId);
      window.removeEventListener("resize", updateViewportHeight);
      window.removeEventListener("orientationchange", updateViewportHeight);
      window.visualViewport?.removeEventListener("resize", updateViewportHeight);
      window.visualViewport?.removeEventListener("scroll", updateViewportHeight);
    };
  }, [isMobileRoute]);

  useEffect(() => {
    const pathname = location.pathname;
    if (!pathname || pathname === "/login" || pathname.startsWith("/mobile/")) {
      return;
    }
    writeRecentVisit(pathname, resolvePageMeta(pathname, permissions).title, permissions);
  }, [location.pathname, permissions]);

  if (mobileEquivalentPath && mobileEquivalentPath !== `${location.pathname}${location.search}`) {
    return <Navigate to={mobileEquivalentPath} replace />;
  }

  return (
    <div className="app-shell relative flex min-h-screen overflow-hidden">
      {isMobileRoute ? null : <Sidebar />}

      <main
        className={`app-shell-main flex min-w-0 flex-1 flex-col ${isMobileRoute ? "hyb-mobile-shell overflow-hidden" : "xl:ml-72"}`}
        style={isMobileRoute ? { height: "var(--mobile-viewport-height, 100vh)", maxHeight: "var(--mobile-viewport-height, 100vh)", minHeight: "var(--mobile-viewport-height, 100vh)" } : undefined}
      >
        {isMobileRoute ? null : <Topbar />}

        <div className={`flex-1 px-4 py-5 ${isMobileRoute ? `min-h-0 overscroll-contain overflow-y-auto px-[var(--mobile-page-x)] py-[var(--mobile-page-y)] ${showMobileBottomNav ? "pb-[calc(var(--mobile-bottom-nav-height,68px)+env(safe-area-inset-bottom,0px)+var(--mobile-page-y)+0.5rem)]" : "pb-5 sm:pb-6"}` : "sm:px-7 sm:py-7 lg:px-8"}`}>
          <div className="layout-container max-w-none">
            <AppPwaUpdateNotice />
            <ErrorBoundary>
              <Outlet />
            </ErrorBoundary>
          </div>
        </div>

        {showMobileBottomNav ? <MobileBottomNav /> : null}
      </main>
    </div>
  );
}