/**
 * GlobalSidebarContext - 全局右侧工具栏状态管理
 *
 * 管理侧边栏的展开/收起状态和数据加载
 * 自选股和关注事件数据都从 Redux 获取，与导航栏共用数据源
 */

import React, { createContext, useContext, useState, useCallback, useEffect, useRef } from 'react';
import { useSelector, useDispatch } from 'react-redux';
import { useAuth } from './AuthContext';
import { logger } from '@/utils/logger';
import {
  loadWatchlist,
  loadWatchlistQuotes,
  toggleWatchlist,
  loadFollowingEvents,
  loadEventComments,
  toggleFollowEvent
} from '@/store/slices/stockSlice';

const GlobalSidebarContext = createContext(null);

/**
 * GlobalSidebarProvider - 全局侧边栏 Provider
 */
export const GlobalSidebarProvider = ({ children }) => {
  const { user } = useAuth();
  const userId = user?.id;
  const dispatch = useDispatch();

  // 侧边栏展开/收起状态（默认折叠）
  const [isOpen, setIsOpen] = useState(false);

  // 从 Redux 获取自选股数据（与导航栏共用）
  const watchlist = useSelector(state => state.stock.watchlist || []);
  const watchlistQuotes = useSelector(state => state.stock.watchlistQuotes || []);
  const watchlistLoading = useSelector(state => state.stock.loading?.watchlist);
  const quotesLoading = useSelector(state => state.stock.loading?.watchlistQuotes);

  // 将 watchlistQuotes 数组转换为 { stock_code: quote } 格式（兼容现有组件）
  const realtimeQuotes = React.useMemo(() => {
    const quotesMap = {};
    watchlistQuotes.forEach(item => {
      quotesMap[item.stock_code] = item;
    });
    return quotesMap;
  }, [watchlistQuotes]);

  // 从 Redux 获取关注事件数据（与导航栏共用）
  const followingEvents = useSelector(state => state.stock.followingEvents || []);
  const eventComments = useSelector(state => state.stock.eventComments || []);
  const eventsLoading = useSelector(state => state.stock.loading?.followingEvents || false);

  // 防止重复加载
  const hasLoadedRef = useRef(false);

  /**
   * 切换侧边栏展开/收起
   */
  const toggle = useCallback(() => {
    setIsOpen(prev => !prev);
  }, []);

  /**
   * 加载实时行情（通过 Redux）
   */
  const loadRealtimeQuotes = useCallback(() => {
    if (!userId) return;
    dispatch(loadWatchlistQuotes());
  }, [userId, dispatch]);

  /**
   * 加载所有数据（自选股和关注事件都从 Redux 获取）
   */
  const loadData = useCallback(() => {
    if (!userId) return;

    // 自选股通过 Redux 加载
    dispatch(loadWatchlist());
    dispatch(loadWatchlistQuotes());

    // 关注事件和评论通过 Redux 加载
    dispatch(loadFollowingEvents());
    dispatch(loadEventComments());
  }, [userId, dispatch]);

  /**
   * 刷新数据
   */
  const refresh = useCallback(async () => {
    await loadData();
  }, [loadData]);

  /**
   * 取消关注股票（通过 Redux）
   */
  const unwatchStock = useCallback(async (stockCode) => {
    if (!userId) return;
    try {
      // 找到股票名称
      const stockItem = watchlist.find(s => s.stock_code === stockCode);
      const stockName = stockItem?.stock_name || '';

      // 通过 Redux action 移除（乐观更新）
      await dispatch(toggleWatchlist({
        stockCode,
        stockName,
        isInWatchlist: true  // 表示当前在自选股中，需要移除
      })).unwrap();

      logger.debug('GlobalSidebar', 'unwatchStock 成功', { stockCode });
    } catch (error) {
      logger.error('GlobalSidebar', 'unwatchStock', error, { stockCode, userId });
    }
  }, [userId, dispatch, watchlist]);

  /**
   * 取消关注事件（通过 Redux）
   */
  const unfollowEvent = useCallback(async (eventId) => {
    if (!userId) return;
    try {
      // 通过 Redux action 取消关注（乐观更新）
      await dispatch(toggleFollowEvent({
        eventId,
        isFollowing: true  // 表示当前已关注，需要取消
      })).unwrap();

      logger.debug('GlobalSidebar', 'unfollowEvent 成功', { eventId });
    } catch (error) {
      logger.error('GlobalSidebar', 'unfollowEvent', error, { eventId, userId });
      // 失败时重新加载列表
      dispatch(loadFollowingEvents());
    }
  }, [userId, dispatch]);

  // 用户登录后加载数据
  useEffect(() => {
    if (user && !hasLoadedRef.current) {
      console.log('[GlobalSidebar] 用户登录，加载数据');
      hasLoadedRef.current = true;
      loadData();
    }

    // 用户登出时重置（所有状态由 Redux 管理）
    if (!user) {
      hasLoadedRef.current = false;
    }
  }, [user, loadData]);

  // 页面可见性变化时刷新数据
  useEffect(() => {
    const onVisibilityChange = () => {
      if (document.visibilityState === 'visible' && user) {
        console.log('[GlobalSidebar] 页面可见，刷新数据');
        loadData();
      }
    };

    document.addEventListener('visibilitychange', onVisibilityChange);
    return () => document.removeEventListener('visibilitychange', onVisibilityChange);
  }, [user, loadData]);

  // 定时刷新实时行情（每分钟一次，两个面板共用）
  useEffect(() => {
    if (watchlist.length > 0 && userId) {
      const interval = setInterval(() => {
        console.log('[GlobalSidebar] 定时刷新行情');
        dispatch(loadWatchlistQuotes());
      }, 60000);

      return () => clearInterval(interval);
    }
  }, [watchlist.length, userId, dispatch]);

  const value = {
    // 状态
    isOpen,
    toggle,

    // 数据（watchlist 和 realtimeQuotes 从 Redux 获取）
    watchlist,
    realtimeQuotes,
    followingEvents,
    eventComments,

    // 加载状态
    loading: watchlistLoading || eventsLoading,
    quotesLoading,

    // 方法
    refresh,
    loadRealtimeQuotes,
    unwatchStock,
    unfollowEvent,
  };

  return (
    <GlobalSidebarContext.Provider value={value}>
      {children}
    </GlobalSidebarContext.Provider>
  );
};

/**
 * useGlobalSidebar - 获取全局侧边栏 Context
 */
export const useGlobalSidebar = () => {
  const context = useContext(GlobalSidebarContext);
  if (!context) {
    throw new Error('useGlobalSidebar must be used within a GlobalSidebarProvider');
  }
  return context;
};

export default GlobalSidebarContext;