import React, { useEffect, useRef, useState } from 'react';
import { AppState, AppStateStatus, Platform, View, ActivityIndicator } from 'react-native';
import { Stack, useRouter } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import { GestureHandlerRootView } from 'react-native-gesture-handler';
import { SafeAreaProvider } from 'react-native-safe-area-context';
import { PaperProvider } from 'react-native-paper';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import * as SystemUI from 'expo-system-ui';
import { useFonts } from 'expo-font';

import { registerNotificationPresentationHandler } from '@/services/notification';
import { api } from '@/services/core';
import { wsService } from '@/services/core';
import { EventSubscriber } from '../src/infrastructure/EventSubscriber';
import {
  ThemeBootstrap,
  useAppColors,
  usePaperThemeFromStore,
  useResolvedColorScheme,
} from '../src/theme';

import AppPromptBar from '../src/components/common/AppPromptBar';
import AppDialogHost from '../src/components/common/AppDialogHost';
import { installAlertOverride } from '@/services/ui';
import { useAuthStore } from '../src/stores';
import { checkForAPKUpdate } from '@/services/platform';
import { CallScreen, IncomingCallModal, FloatingCallWindow } from '../src/components/call';
import { jpushService } from '@/services/notification/jpushService';

registerNotificationPresentationHandler();

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      retry: 2,
      staleTime: 5 * 60 * 1000,
    },
  },
});

installAlertOverride();

if (Platform.OS === 'web' && typeof document !== 'undefined') {
  const style = document.createElement('style');
  style.textContent = `
    input:focus, textarea:focus, select:focus {
      outline: none !important;
      outline-width: 0 !important;
      box-shadow: none !important;
    }
    input:focus-visible, textarea:focus-visible {
      outline: none !important;
    }
    *:focus { outline: none !important; }
    *:focus-visible { outline: none !important; }
    /* 修复移动端滑动问题 - 仅对根容器限制 */
    html, body {
      overscroll-behavior: none;
      touch-action: manipulation;
      -webkit-overflow-scrolling: touch;
    }
    /* React Native Web 生成的滚动容器 - 允许双向滑动 */
    [class*="css-view"] {
      touch-action: auto;
      -webkit-overflow-scrolling: touch;
    }
    /* 水平滚动容器 */
    [data-horizontal-scroll="true"],
    div[style*="overflow-x"],
    div[style*="overflow: scroll"],
    div[style*="overflow: auto"] {
      touch-action: pan-x pan-y;
      -webkit-overflow-scrolling: touch;
    }
    /* 手势区域 - 允许滑动手势 */
    [data-gesture-area="true"] {
      touch-action: pan-x pan-y;
    }
    /* 图片查看器手势区域 */
    .react-native-image-viewer,
    [data-image-viewer="true"] {
      touch-action: pinch-zoom pan-x pan-y;
    }
  `;
  document.head.appendChild(style);
}

function SystemChrome() {
  const colors = useAppColors();
  useEffect(() => {
    void SystemUI.setBackgroundColorAsync(colors.background.default);
    if (Platform.OS === 'web' && typeof document !== 'undefined') {
      const meta = document.querySelector('meta[name="theme-color"]');
      if (meta) {
        meta.setAttribute('content', colors.background.default);
      }
    }
  }, [colors.background.default]);
  return null;
}

function SessionGate({ children }: { children: React.ReactNode }) {
  const [ready, setReady] = useState(false);
  const fetchCurrentUser = useAuthStore((s) => s.fetchCurrentUser);
  const colors = useAppColors();

  useEffect(() => {
    fetchCurrentUser().finally(() => setReady(true));
  }, [fetchCurrentUser]);

  if (!ready) {
    return (
      <View
        style={{
          flex: 1,
          justifyContent: 'center',
          alignItems: 'center',
          backgroundColor: colors.background.default,
        }}
      >
        <ActivityIndicator size="large" color={colors.primary.main} />
      </View>
    );
  }
  return <>{children}</>;
}

function NotificationBootstrap() {
  const appState = useRef<AppStateStatus>(AppState.currentState);
  const permissionRequested = useRef(false);
  const router = useRouter();

  useEffect(() => {
    const initNotifications = async () => {
      const { loadNotificationPreferences } = await import('@/services/notification');
      await loadNotificationPreferences();
      const { systemNotificationService } = await import('@/services/notification');
      await systemNotificationService.initialize();
      const { initBackgroundService } = await import('@/services/background');
      await initBackgroundService();

      const subscription = AppState.addEventListener('change', (nextAppState) => {
        if (appState.current.match(/inactive|background/) && nextAppState === 'active') {
          systemNotificationService.clearBadge();
        }
        appState.current = nextAppState;
      });

      // Listen for JPush notification taps — navigate to the relevant screen
      jpushService.onNotification((message) => {
        console.log('[NotificationBootstrap] JPush notification:', message.notificationEventType, message);
        if (message.notificationEventType !== 'notificationOpened') return;

        const extras = message.extras || {};
        const notifType = extras.notification_type || message.notificationType;

        if (notifType === 'chat_message' || notifType === 'chat') {
          const conversationId = extras.conversation_id || extras.conversationId;
          const senderId = extras.sender_id || extras.senderId;
          const conversationType = extras.conversation_type || extras.conversationType;
          const groupId = extras.group_id || extras.groupId;
          const groupName = extras.group_name || extras.groupName;

          if (conversationId) {
            const isGroup = conversationType === 'group';
            const q = new URLSearchParams();
            if (isGroup) {
              q.set('isGroupChat', '1');
              if (groupId) q.set('groupId', groupId);
              if (groupName) q.set('groupName', groupName);
            } else if (senderId) {
              q.set('userId', senderId);
            }
            const qs = q.toString();
            router.push(`/chat/${encodeURIComponent(conversationId)}${qs ? `?${qs}` : ''}`);
          } else {
            router.push('/messages/notifications');
          }
        } else {
          router.push('/messages/notifications');
        }
      });

      return () => {
        subscription.remove();
      };
    };

    const requestPermissionOnLaunch = async () => {
      if (permissionRequested.current) return;
      permissionRequested.current = true;

      if (Platform.OS === 'web') return;

      try {
        const hasPermission = await jpushService.checkNotificationPermission();
        if (!hasPermission) {
          await jpushService.requestNotificationPermission();
        }
      } catch (error) {
        console.warn('[NotificationBootstrap] request permission on launch failed:', error);
      }
    };

    initNotifications();
    requestPermissionOnLaunch();
  }, []);

  return null;
}

function APKUpdateBootstrap() {
  const hasChecked = useRef(false);

  useEffect(() => {
    if (hasChecked.current) return;
    hasChecked.current = true;

    // 延迟执行，避免与启动流程冲突
    const timer = setTimeout(() => {
      checkForAPKUpdate().catch((error) => {
        console.error('APK update check failed:', error);
      });
    }, 3000);

    return () => clearTimeout(timer);
  }, []);

  return null;
}

function ThemedStack() {
  const router = useRouter();
  const resolved = useResolvedColorScheme();

  return (
    <>
      <StatusBar style={resolved === 'dark' ? 'light' : 'dark'} />
      <SystemChrome />
      <EventSubscriber />
      <SessionGate>
        <NotificationBootstrap />
        <APKUpdateBootstrap />
        <Stack screenOptions={{ headerShown: false }}>
          <Stack.Screen name="index" options={{ headerShown: false }} />
          <Stack.Screen name="(auth)" options={{ headerShown: false }} />
          <Stack.Screen name="(app)" options={{ headerShown: false }} />
          <Stack.Screen
            name="terms"
            options={{
              headerShown: false,
            }}
          />
          <Stack.Screen
            name="privacy"
            options={{
              headerShown: false,
            }}
          />
          <Stack.Screen
            name="post/[postId]"
            options={{
              headerShown: false,
            }}
          />
          <Stack.Screen
            name="user/[userId]"
            options={{
              headerShown: false,
            }}
          />
        </Stack>
      </SessionGate>
    </>
  );
}

function ThemedProviders({ children }: { children: React.ReactNode }) {
  const theme = usePaperThemeFromStore();
  return <PaperProvider theme={theme}>{children}</PaperProvider>;
}

export default function RootLayout() {
  const [fontsLoaded] = useFonts({});

  if (!fontsLoaded) {
    return (
      <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
        <ActivityIndicator />
      </View>
    );
  }

  return (
    <GestureHandlerRootView style={{ flex: 1 }}>
      <SafeAreaProvider>
        <ThemedProviders>
          <QueryClientProvider client={queryClient}>
            <ThemeBootstrap />
            <ThemedStack />
            <AppPromptBar />
            <AppDialogHost />
            <IncomingCallModal />
            <CallScreen />
            <FloatingCallWindow />
          </QueryClientProvider>
        </ThemedProviders>
      </SafeAreaProvider>
    </GestureHandlerRootView>
  );
}
