import { useEffect, useState } from 'react';
import { BrowserRouter, Routes, Route, useParams } from 'react-router-dom';
import { api } from '@/api/client';
import { ProjectSidebar } from '@/components/ProjectSidebar';
import { RightRail } from '@/components/RightRail';
import { Home } from '@/pages/Home';
import { Project } from '@/pages/Project';
import { Session } from '@/pages/Session';
import { Toaster } from '@/components/ui/sonner';
import { useUserEvents } from '@/hooks/useUserEvents';
import { SidebarDrawerProvider, useSidebarDrawer } from '@/hooks/useSidebarDrawer';
import { RightRailDrawerProvider, useRightRailDrawer } from '@/hooks/useRightRailDrawer';
import { useViewport } from '@/hooks/useViewport';

function SessionRightRail() {
  const { id } = useParams<{ id: string }>();
  if (!id) return null;
  return <RightRailForSession sessionId={id} />;
}

function RightRailForSession({ sessionId }: { sessionId: string }) {
  const [projectId, setProjectId] = useState<string | null>(null);
  useEffect(() => {
    api.sessions
      .get(sessionId)
      .then((s) => setProjectId(s.project_id))
      .catch((err) => console.warn('RightRail: failed to fetch session', err));
  }, [sessionId]);
  if (!projectId) return null;
  // v1.6.2: rendered on all viewports. On mobile, RightRail itself renders as
  // a right-side drawer toggled by the header's FolderTree button (via
  // useRightRailDrawer). On desktop, it renders inline as before with its
  // own internal open/close state.
  return <RightRail projectId={projectId} />;
}

function MobileBackdrop() {
  const { open, setOpen } = useSidebarDrawer();
  const { isMobile } = useViewport();
  if (!isMobile || !open) return null;
  return (
    <div
      className="fixed inset-0 z-30 bg-black/40 md:hidden"
      onClick={() => setOpen(false)}
      aria-hidden="true"
    />
  );
}

function MobileRightRailBackdrop() {
  const { open, setOpen } = useRightRailDrawer();
  const { isMobile } = useViewport();
  if (!isMobile || !open) return null;
  return (
    <div
      className="fixed inset-0 z-30 bg-black/40 md:hidden"
      onClick={() => setOpen(false)}
      aria-hidden="true"
    />
  );
}

function AppShell() {
  useUserEvents();
  return (
    <div className="dark h-screen flex bg-background text-foreground">
      <ProjectSidebar />
      <MobileBackdrop />
      <main className="flex-1 flex flex-col min-w-0">
        <Routes>
          <Route path="/" element={<Home />} />
          <Route path="/project/:id" element={<Project />} />
          <Route path="/session/:id" element={<Session />} />
        </Routes>
      </main>
      <MobileRightRailBackdrop />
      <Routes>
        <Route path="/session/:id" element={<SessionRightRail />} />
      </Routes>
      <Toaster position="bottom-right" />
    </div>
  );
}

export default function App() {
  return (
    <BrowserRouter>
      <SidebarDrawerProvider>
        <RightRailDrawerProvider>
          <AppShell />
        </RightRailDrawerProvider>
      </SidebarDrawerProvider>
    </BrowserRouter>
  );
}