import React, { useEffect, useState } from "react";
import { Stack } from "expo-router";
import { StatusBar } from "expo-status-bar";
import { PortalHost } from "@rn-primitives/portal";
import { GestureHandlerRootView } from "react-native-gesture-handler";
import { Toast } from "@/components/Toast";
import "@/global.css";
import { SafeAreaProvider } from "react-native-safe-area-context";
import { View, ActivityIndicator, InteractionManager } from "react-native";
import { useRestoreTheme, NAV_THEME } from "@/lib/theme";
import { SirouRouterProvider, useSirouRouter } from "@sirou/react-native";
import { NavigationContainer, NavigationIndependentTree, ThemeProvider } from "@react-navigation/native";
import { routes } from "@/lib/routes";
import { authGuard, guestGuard } from "@/lib/auth-guards";
import { useAuthStore } from "@/lib/auth-store";
import { useFonts } from 'expo-font';
import { api } from "@/lib/api";
import { useColorScheme } from 'react-native';

import { useSegments } from "expo-router";

function BackupGuard() {
  const segments = useSegments();
  const isAuthed = useAuthStore((s) => s.isAuthenticated);
  const [isMounted, setIsMounted] = useState(false);

  useEffect(() => {
    setIsMounted(true);
  }, []);

  useEffect(() => {
    if (!isMounted) return;

    // Intentionally disabled: redirecting here can happen before the root layout
    // navigator is ready and cause "Attempted to navigate before mounting".
    // Sirou guards handle redirects.
  }, [segments, isAuthed, isMounted]);

  return null;
}

function SirouBridge() {
  const sirou = useSirouRouter();
  const segments = useSegments();
  const isAuthenticated = useAuthStore((s) => s.isAuthenticated);
  const [isMounted, setIsMounted] = useState(false);

  useEffect(() => {
    setIsMounted(true);
  }, []);

  useEffect(() => {
    if (!isMounted) return;

    const checkAuth = async () => {
      // Create EXACT name from segments: (tabs), index => (tabs)/index
      // Use "root" if segments are empty (initial layout)
      const routeName = segments.length > 0 ? segments.join("/") : "root";

      console.log(`[SirouBridge] checking route: "${routeName}"`);

      try {
        const result = await (sirou as any).checkGuards(routeName);
        if (!result.allowed && result.redirect) {
          console.log(`[SirouBridge] REDIRECT -> ${result.redirect}`);
          // Use Sirou navigation safely
          InteractionManager.runAfterInteractions(() => {
            sirou.go(result.redirect);
          });
        }
      } catch (e: any) {
        console.warn(
          `[SirouBridge] guard crash for "${routeName}":`,
          e.message,
        );
      }
    };

    checkAuth();
  }, [segments, sirou, isMounted, isAuthenticated]);

  return null;
}

export default function RootLayout() {
  const colorScheme = useColorScheme();
  useRestoreTheme();
  const [isMounted, setIsMounted] = useState(false);
  const [hasHydrated, setHasHydrated] = useState(false);
  const [fontsLoaded] = useFonts({
    'DMSans-Regular': require('../assets/fonts/DMSans-Regular.ttf'),
    'DMSans-Bold': require('../assets/fonts/DMSans-Bold.ttf'),
    'DMSans-Medium': require('../assets/fonts/DMSans-Medium.ttf'),
    'DMSans-SemiBold': require('../assets/fonts/DMSans-SemiBold.ttf'),
    'DMSans-Light': require('../assets/fonts/DMSans-Light.ttf'),
    'DMSans-ExtraLight': require('../assets/fonts/DMSans-ExtraLight.ttf'),
    'DMSans-Thin': require('../assets/fonts/DMSans-Thin.ttf'),
    'DMSans-Black': require('../assets/fonts/DMSans-Black.ttf'),
    'DMSans-ExtraBold': require('../assets/fonts/DMSans-ExtraBold.ttf'),
  });

  useEffect(() => {
    setIsMounted(true);

    const initializeAuth = async () => {
      if (useAuthStore.persist.hasHydrated()) {
        setHasHydrated(true);
      } else {
        const unsub = useAuthStore.persist.onFinishHydration(() => {
          setHasHydrated(true);
        });
        return unsub;
      }
    };

    initializeAuth();
  }, []);

  if (!isMounted || !hasHydrated || !fontsLoaded) {
    return (
      <View
        style={{
          flex: 1,
          alignItems: "center",
          justifyContent: "center",
          backgroundColor: "rgba(255, 255, 255, 1)",
        }}
      >
        <ActivityIndicator size="large" color="#ea580c" />
      </View>
    );
  }

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <SafeAreaProvider>
        <NavigationIndependentTree>
          <NavigationContainer>
            <SirouRouterProvider config={routes} guards={[authGuard, guestGuard]}>
              <ThemeProvider
                value={colorScheme === "dark" ? NAV_THEME.dark : NAV_THEME.light}
              >
                <View className="flex-1 bg-background">
                  <StatusBar style={colorScheme === "dark" ? "light" : "dark"} />
                  <Stack
                    screenOptions={{
                      headerShown: false,
                    }}
                  >
                    <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
                    <Stack.Screen
                      name="sms-scan"
                      options={{ headerShown: false }}
                    />
                    <Stack.Screen
                      name="proforma/[id]"
                      options={{ title: "Proforma request" }}
                    />
                    <Stack.Screen
                      name="payments/[id]"
                      options={{ title: "Payment" }}
                    />
                    <Stack.Screen
                      name="notifications/index"
                      options={{ title: "Notifications" }}
                    />
                    <Stack.Screen
                      name="notifications/settings"
                      options={{ title: "Notification settings" }}
                    />
                    <Stack.Screen name="help" options={{ headerShown: false }} />
                    <Stack.Screen name="terms" options={{ headerShown: false }} />
                    <Stack.Screen name="privacy" options={{ headerShown: false }} />
                    <Stack.Screen name="history" options={{ headerShown: false }} />
                    <Stack.Screen name="company" options={{ headerShown: false }} />
                    <Stack.Screen
                      name="company-details"
                      options={{ headerShown: false }}
                    />
                    <Stack.Screen
                      name="login"
                      options={{ title: "Sign in", headerShown: false }}
                    />
                    <Stack.Screen
                      name="register"
                      options={{ title: "Create account", headerShown: false }}
                    />
                    <Stack.Screen
                      name="invoices/[id]"
                      options={{ title: "Invoice" }}
                    />
                    <Stack.Screen
                      name="reports/index"
                      options={{ title: "Reports" }}
                    />
                    <Stack.Screen
                      name="documents/index"
                      options={{ title: "Documents" }}
                    />
                    <Stack.Screen name="settings" options={{ title: "Settings" }} />
                    <Stack.Screen name="profile" options={{ headerShown: false }} />
                    <Stack.Screen
                      name="edit-profile"
                      options={{ headerShown: false }}
                    />
                  </Stack>
                  <SirouBridge />
                  <BackupGuard />
                  <PortalHost />
                  <Toast />
                </View>
              </ThemeProvider>
            </SirouRouterProvider>
          </NavigationContainer>
        </NavigationIndependentTree>
      </SafeAreaProvider>
    </GestureHandlerRootView>
  );
}