import { lazy, Suspense, useEffect, type ReactNode } from "react";
import { Route, Routes } from "react-router";
import { useApi } from "./api/context";
import { startClockTicker, syncClock } from "./clock/clock";
import { AwaySummary } from "./components/AwaySummary";
import { DealModal } from "./components/DealModal";
import { formatCredits } from "./format";
import { tabAttention } from "./layout/attention";
import { Layout } from "./layout/Layout";
import { SCREENS } from "./routes";
import { Contracts } from "./screens/Contracts";
import { Fleet } from "./screens/Fleet";
import { HQ } from "./screens/HQ";
import { Locations } from "./screens/Locations";
import { Market } from "./screens/Market";
import { Pilots } from "./screens/Pilots";
import { Settings } from "./screens/Settings";
import { useMotionPreference } from "./state/preferences";
import { StartScreen } from "./screens/StartScreen";
import { usePlayerState, useRefetchOnArrival } from "./state/player";
import { Button } from "./ui";

// The map pulls in PixiJS; load it only when the Map tab is opened.
const MapScreen = lazy(() => import("./screens/MapScreen").then((m) => ({ default: m.MapScreen })));

const SCREEN_COMPONENTS: Record<(typeof SCREENS)[number]["path"], ReactNode> = {
  "/": <HQ />,
  "/map": (
    <Suspense fallback={<p className="p-4 text-ink-400">Loading map…</p>}>
      <MapScreen />
    </Suspense>
  ),
  "/contracts": <Contracts />,
  "/fleet": <Fleet />,
  "/pilots": <Pilots />,
  "/market": <Market />,
  "/locations": <Locations />,
};

/** Syncs the clock with the server once, then ticks it every second. */
function useServerClock() {
  const api = useApi();
  useEffect(() => {
    syncClock(api).catch(() => {
      // Offline or server down: keep the device clock until the next launch.
    });
    return startClockTicker();
  }, [api]);
}

/** The whole client. Router, API and query providers come from the caller. */
export function App() {
  useServerClock();
  useMotionPreference();
  const state = usePlayerState();
  useRefetchOnArrival(state.data ?? null, state.refetch);
  const retry = () => void state.refetch();

  if (state.isPending) {
    return (
      <p className="grid min-h-dvh place-items-center font-display tracking-[0.3em] text-ink-400 uppercase">
        Loading…
      </p>
    );
  }
  if (state.data === undefined) {
    // The first load failed: nothing to show yet.
    return (
      <div role="alert" className="grid min-h-dvh place-content-center gap-4 p-6 text-center">
        <p className="font-display text-lg text-rose-300">Could not reach the server.</p>
        <Button onClick={retry} disabled={state.isFetching}>
          {state.isFetching ? "Retrying…" : "Retry"}
        </Button>
      </div>
    );
  }
  if (state.data === null) return <StartScreen />;

  // A later refresh failed: keep showing the last state, with a way to retry.
  const banner = state.isError ? (
    <div
      role="alert"
      className="flex items-center justify-between gap-2 border-b border-rose-500/40 bg-rose-950/80 px-4 py-2 text-sm text-rose-200 backdrop-blur"
    >
      <span>Offline — showing last update.</span>
      <Button variant="danger" size="sm" onClick={retry}>
        Retry
      </Button>
    </div>
  ) : null;

  return (
    <>
      <Routes>
        <Route
          element={
            <Layout
              credits={formatCredits(state.data.company.credits)}
              banner={banner}
              attention={tabAttention(state.data)}
            />
          }
        >
          {SCREENS.map((screen) => (
            <Route
              key={screen.path}
              index={screen.path === "/"}
              path={screen.path === "/" ? undefined : screen.path}
              element={SCREEN_COMPONENTS[screen.path]}
            />
          ))}
          {/* Settings opens from the header gear, not a tab (CR-011). */}
          <Route path="/settings" element={<Settings />} />
        </Route>
      </Routes>
      <AwaySummary />
      <DealModal />
    </>
  );
}