// src/views/Community/components/DynamicNewsCard.js
// 横向滚动事件卡片组件（实时要闻·动态追踪）

import React, { forwardRef, useState, useEffect } from 'react';
import { useDispatch } from 'react-redux';
import {
  Card,
  CardHeader,
  CardBody,
  Box,
  Flex,
  VStack,
  HStack,
  Heading,
  Text,
  Badge,
  Center,
  Spinner,
  useColorModeValue
} from '@chakra-ui/react';
import { TimeIcon } from '@chakra-ui/icons';
import EventScrollList from './DynamicNewsCard/EventScrollList';
import DynamicNewsDetailPanel from './DynamicNewsDetail';
import { fetchDynamicNews } from '../../../store/slices/communityDataSlice';

/**
 * 实时要闻·动态追踪 - 横向滚动卡片组件
 * @param {Array} events - 事件列表
 * @param {boolean} loading - 加载状态
 * @param {Object} pagination - 分页信息 { page, per_page, total, total_pages }
 * @param {Date} lastUpdateTime - 最后更新时间
 * @param {Function} onEventClick - 事件点击回调
 * @param {Function} onViewDetail - 查看详情回调
 * @param {Object} ref - 用于滚动的ref
 */
const DynamicNewsCard = forwardRef(({
  events,
  loading,
  pagination = {},
  lastUpdateTime,
  onEventClick,
  onViewDetail,
  ...rest
}, ref) => {
  const dispatch = useDispatch();
  const cardBg = useColorModeValue('white', 'gray.800');
  const borderColor = useColorModeValue('gray.200', 'gray.700');
  const [selectedEvent, setSelectedEvent] = useState(null);

  const pageSize = 5; // 每页显示5个事件
  const currentPage = pagination.page || 1;
  const totalPages = pagination.total_pages || 1;

  // 默认选中第一个事件
  useEffect(() => {
    if (events && events.length > 0 && !selectedEvent) {
      setSelectedEvent(events[0]);
    }
  }, [events, selectedEvent]);

  // 页码改变时，触发服务端分页请求
  const handlePageChange = (newPage) => {
    // 发起 Redux action 获取新页面数据
    dispatch(fetchDynamicNews({ page: newPage, per_page: pageSize }));

    // 重置选中事件（等新数据加载后自动选中第一个）
    setSelectedEvent(null);
  };

  return (
    <Card ref={ref} {...rest} bg={cardBg} borderColor={borderColor} mb={4}>
      {/* 标题部分 */}
      <CardHeader>
        <Flex justify="space-between" align="center">
          <VStack align="start" spacing={1}>
            <Heading size="md">
              <HStack>
                <TimeIcon />
                <Text>实时要闻·动态追踪</Text>
              </HStack>
            </Heading>
            <HStack fontSize="sm" color="gray.500">
              <Badge colorScheme="red">实时</Badge>
              <Badge colorScheme="green">盘中</Badge>
              <Badge colorScheme="blue">快讯</Badge>
            </HStack>
          </VStack>
          <Text fontSize="xs" color="gray.500">
            最后更新: {lastUpdateTime?.toLocaleTimeString() || '未知'}
          </Text>
        </Flex>
      </CardHeader>

      {/* 主体内容 */}
      <CardBody position="relative">
        {/* Loading 状态 */}
        {loading && (
          <Center py={10}>
            <VStack>
              <Spinner size="xl" color="blue.500" thickness="4px" />
              <Text color="gray.500">正在加载最新事件...</Text>
            </VStack>
          </Center>
        )}

        {/* Empty 状态 */}
        {!loading && (!events || events.length === 0) && (
          <Center py={10}>
            <VStack>
              <Text fontSize="lg" color="gray.500">暂无事件数据</Text>
            </VStack>
          </Center>
        )}

        {/* 横向滚动事件列表 */}
        {!loading && events && events.length > 0 && (
          <EventScrollList
            events={events}
            selectedEvent={selectedEvent}
            onEventSelect={setSelectedEvent}
            borderColor={borderColor}
            currentPage={currentPage}
            totalPages={totalPages}
            onPageChange={handlePageChange}
          />
        )}

        {/* 详情面板 */}
        {!loading && events && events.length > 0 && (
          <Box mt={6}>
            <DynamicNewsDetailPanel event={selectedEvent} />
          </Box>
        )}
      </CardBody>
    </Card>
  );
});

DynamicNewsCard.displayName = 'DynamicNewsCard';

export default DynamicNewsCard;