// src/views/Community/index.js
import React, { useEffect, useRef, useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { useSelector, useDispatch } from 'react-redux';
import {
  fetchPopularKeywords,
  fetchHotEvents
} from '../../store/slices/communityDataSlice';
import {
  Box,
  Container,
  useColorModeValue,
  Alert,
  AlertIcon,
  AlertTitle,
  AlertDescription,
  Button,
  CloseButton,
  HStack,
  VStack,
  Text,
} from '@chakra-ui/react';

// 导入组件
import DynamicNewsCard from './components/DynamicNewsCard';
import HotEventsSection from './components/HotEventsSection';

// 导入自定义 Hooks
import { useEventData } from './hooks/useEventData';
import { useEventFilters } from './hooks/useEventFilters';
import { useCommunityEvents } from './hooks/useCommunityEvents';

import { logger } from '../../utils/logger';
import { useNotification } from '../../contexts/NotificationContext';

// 导航栏已由 MainLayout 提供，无需在此导入

const Community = () => {
  const navigate = useNavigate();
  const dispatch = useDispatch();

  // Redux状态
  const { popularKeywords, hotEvents } = useSelector(state => state.communityData);

  // Chakra UI hooks
  const bgColor = useColorModeValue('gray.50', 'gray.900');
  const alertBgColor = useColorModeValue('blue.50', 'blue.900');
  const alertBorderColor = useColorModeValue('blue.200', 'blue.700');

  // Ref：用于首次滚动到内容区域
  const containerRef = useRef(null);

  // ⚡ 通知权限引导
  const { browserPermission, requestBrowserPermission } = useNotification();

  // 通知横幅显示状态
  const [showNotificationBanner, setShowNotificationBanner] = useState(false);

  // 🎯 初始化Community埋点Hook
  const communityEvents = useCommunityEvents({ navigate });

  // 自定义 Hooks
  const { filters, updateFilters, handlePageChange, handleEventClick, handleViewDetail } = useEventFilters({
    navigate
  });

  const { events, pagination, loading, lastUpdateTime } = useEventData(filters);

  // 加载热门关键词和热点事件（动态新闻由 DynamicNewsCard 内部管理）
  useEffect(() => {
    dispatch(fetchPopularKeywords());
    dispatch(fetchHotEvents());
  }, [dispatch]);

  // 🎯 追踪新闻列表查看（当事件列表加载完成后）
  useEffect(() => {
    if (events && events.length > 0 && !loading) {
      communityEvents.trackNewsListViewed({
        totalCount: pagination?.total || events.length,
        sortBy: filters.sort,
        importance: filters.importance,
        dateRange: filters.date_range,
        industryFilter: filters.industry_code,
      });
    }
  }, [events, loading, pagination, filters]);

  // ⚡ 检查通知权限状态，显示横幅提示
  useEffect(() => {
    // 延迟3秒显示，让用户先浏览页面
    const timer = setTimeout(() => {
      // 如果未授权或未请求过权限，显示横幅
      if (browserPermission !== 'granted') {
        const hasClosedBanner = localStorage.getItem('notification_banner_closed');
        if (!hasClosedBanner) {
          setShowNotificationBanner(true);
          logger.info('Community', '显示通知权限横幅');
        }
      }
    }, 3000);

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

  // 处理开启通知
  const handleEnableNotifications = async () => {
    const permission = await requestBrowserPermission();
    if (permission === 'granted') {
      setShowNotificationBanner(false);
      logger.info('Community', '通知权限已授予');
    }
  };

  // 处理关闭横幅
  const handleCloseBanner = () => {
    setShowNotificationBanner(false);
    localStorage.setItem('notification_banner_closed', 'true');
    logger.info('Community', '通知横幅已关闭');
  };

  // ⚡ 首次进入页面时滚动到内容区域（考虑导航栏高度）
  useEffect(() => {
    // 延迟执行，确保DOM已完全渲染
    const timer = setTimeout(() => {
      if (containerRef.current) {
        // 滚动到容器顶部，自动考虑导航栏的高度
        containerRef.current.scrollIntoView({
          behavior: 'auto',
          block: 'start',
          inline: 'nearest'
        });
      }
    }, 0);

    return () => clearTimeout(timer);
  }, []); // 空依赖数组，只在组件挂载时执行一次

  return (
    <Box minH="100vh" bg={bgColor}>
      {/* 主内容区域 */}
      <Container ref={containerRef} maxW="1600px" pt={6} pb={8}>
        {/* 通知权限提示横幅 */}
        {showNotificationBanner && (
          <Alert
            status="info"
            variant="subtle"
            borderRadius="lg"
            mb={4}
            boxShadow="md"
            bg={alertBgColor}
            borderWidth="1px"
            borderColor={alertBorderColor}
          >
            <AlertIcon />
            <Box flex="1">
              <AlertTitle fontSize="md" mb={1}>
                开启桌面通知，不错过重要事件
              </AlertTitle>
              <AlertDescription fontSize="sm">
                即使浏览器最小化，也能第一时间接收新事件推送通知
              </AlertDescription>
            </Box>
            <HStack spacing={2} ml={4}>
              <Button
                size="sm"
                colorScheme="blue"
                onClick={handleEnableNotifications}
              >
                立即开启
              </Button>
              <CloseButton
                onClick={handleCloseBanner}
                position="relative"
              />
            </HStack>
          </Alert>
        )}
        {/* 热点事件区域 */}
        <HotEventsSection
          events={hotEvents}
          onEventClick={communityEvents.trackNewsArticleClicked}
        />

        {/* 实时要闻·动态追踪 - 横向滚动 */}
        <DynamicNewsCard
          filters={filters}
          popularKeywords={popularKeywords}
          lastUpdateTime={lastUpdateTime}
          onSearch={updateFilters}
          onEventClick={handleEventClick}
          onViewDetail={handleViewDetail}
          trackingFunctions={{
            trackNewsArticleClicked: communityEvents.trackNewsArticleClicked,
            trackNewsDetailOpened: communityEvents.trackNewsDetailOpened,
            trackNewsFilterApplied: communityEvents.trackNewsFilterApplied,
            trackNewsSorted: communityEvents.trackNewsSorted,
            trackNewsSearched: communityEvents.trackNewsSearched,
            trackRelatedStockClicked: communityEvents.trackRelatedStockClicked,
          }}
        />
      </Container>
    </Box>
  );
};

export default Community;