import { useState, useEffect, useCallback, lazy, Suspense } from "react";
import { Navbar } from "./components/Navbar";
import { IdentityPanel } from "./components/IdentityPanel";
import { TokenManagerDialog } from "./components/TokenManagerDialog";
import { ThemeProvider } from "./lib/theme";
import { getUuid, setUuid, apiBind, setActiveApiToken } from "./api/client";
import { ACPDirectView } from "./components/ACPDirectView";
import { useTokens } from "./hooks/useTokens";

const Dashboard = lazy(() => import("./pages/Dashboard").then((m) => ({ default: m.Dashboard })));
const SessionDetail = lazy(() => import("./pages/SessionDetail").then((m) => ({ default: m.SessionDetail })));

export default function App() {
  const [currentSessionId, setCurrentSessionId] = useState<string | null>(null);
  const [identityOpen, setIdentityOpen] = useState(false);
  const [tokenDialogOpen, setTokenDialogOpen] = useState(false);
  const [acpDirect, setAcpDirect] = useState<{ url: string; token: string } | null>(null);
  const { tokens, activeTokenId, activeLabel, activeTokenValue, setActiveTokenId, addToken, removeToken, updateToken } = useTokens();

  // Sync active token to API client
  useEffect(() => {
    setActiveApiToken(activeTokenValue);
  }, [activeTokenValue]);

  const handleSetActiveToken = useCallback((id: string) => {
    setActiveTokenId(id);
  }, [setActiveTokenId]);

  // Simple hash-based router
  const parseRoute = useCallback(() => {
    // Ensure UUID exists
    getUuid();

    const path = window.location.pathname;

    // Check for UUID import from QR scan (?uuid=xxx)
    const params = new URLSearchParams(window.location.search);
    const importUuid = params.get("uuid");
    if (importUuid) {
      setUuid(importUuid);
      const url = new URL(window.location.href);
      url.searchParams.delete("uuid");
      window.history.replaceState(null, "", url);
    }

    // Check for ACP direct connection (?acp=1)
    const acpParam = params.get("acp");
    if (acpParam === "1") {
      const stored = sessionStorage.getItem("acp_connection");
      if (stored) {
        try {
          const acpData = JSON.parse(stored);
          if (acpData.url && acpData.token) {
            setAcpDirect({ url: acpData.url, token: acpData.token });
            sessionStorage.removeItem("acp_connection");
            // Clean URL
            const url = new URL(window.location.href);
            url.searchParams.delete("acp");
            window.history.replaceState(null, "", url);
            return;
          }
        } catch {
          sessionStorage.removeItem("acp_connection");
        }
      }
    }

    // Check for CLI session bind (?sid=xxx) — bind session to current UUID
    const sid = params.get("sid");
    if (sid) {
      const url = new URL(window.location.href);
      url.searchParams.delete("sid");
      window.history.replaceState(null, "", `/code/${sid}`);
      setCurrentSessionId(sid);
      // Bind this session to the current user's UUID for ownership
      apiBind(sid).catch((err: unknown) => {
        console.warn("Failed to bind session:", err);
      });
      return;
    }

    // Path-based routing: /code/session_xxx → session detail
    const match = path.match(/^\/code\/([^/]+)/);
    if (match && match[1]) {
      setCurrentSessionId(match[1]);
    } else {
      setCurrentSessionId(null);
    }
  }, []);

  useEffect(() => {
    parseRoute();
    window.addEventListener("popstate", parseRoute);
    return () => window.removeEventListener("popstate", parseRoute);
  }, [parseRoute]);

  const navigateToSession = useCallback((sessionId: string) => {
    window.history.pushState(null, "", `/code/${sessionId}`);
    setCurrentSessionId(sessionId);
  }, []);

  const navigateToDashboard = useCallback(() => {
    window.history.pushState(null, "", "/code/");
    setCurrentSessionId(null);
    setAcpDirect(null);
  }, []);

  return (
    <ThemeProvider defaultTheme="system">
      <div className="flex h-screen flex-col bg-surface-0 text-text-primary">
        <Navbar
          onIdentityClick={() => setIdentityOpen(true)}
          onTokenClick={() => setTokenDialogOpen(true)}
          activeTokenLabel={currentSessionId ? undefined : activeLabel}
          sessionTitle={currentSessionId || (acpDirect ? "ACP" : undefined)}
          onBack={(currentSessionId || acpDirect) ? navigateToDashboard : undefined}
        />

        <Suspense fallback={<div className="flex flex-1 items-center justify-center text-text-muted">Loading...</div>}>
          {acpDirect ? (
            <ACPDirectView url={acpDirect.url} token={acpDirect.token} onBack={navigateToDashboard} />
          ) : currentSessionId ? (
            <SessionDetail key={currentSessionId} sessionId={currentSessionId} />
          ) : (
            <div className="flex-1 overflow-y-auto">
              <Dashboard onNavigateSession={navigateToSession} />
            </div>
          )}
        </Suspense>

        <IdentityPanel open={identityOpen} onClose={() => setIdentityOpen(false)} />

        <TokenManagerDialog
          open={tokenDialogOpen}
          onClose={() => setTokenDialogOpen(false)}
          tokens={tokens}
          activeTokenId={activeTokenId}
          onSetActive={handleSetActiveToken}
          onAdd={addToken}
          onRemove={removeToken}
          onUpdate={updateToken}
        />
      </div>
    </ThemeProvider>
  );
}