// src/hooks/useSubscription.js
// 订阅信息自定义 Hook - 使用 Redux 状态管理

import { useEffect } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { useAuth } from '../contexts/AuthContext';
import { logger } from '../utils/logger';
import {
    fetchSubscriptionInfo,
    openModal,
    closeModal,
    resetToFree,
    selectSubscriptionInfo,
    selectSubscriptionLoading,
    selectSubscriptionLoaded,
    selectSubscriptionError,
    selectSubscriptionModalOpen
} from '../store/slices/subscriptionSlice';

// 订阅级别映射
const SUBSCRIPTION_LEVELS = {
    free: 0,
    pro: 1,
    max: 2
};

// 功能权限映射
const FEATURE_REQUIREMENTS = {
    'related_stocks': 'pro',      // 相关标的
    'related_concepts': 'pro',    // 相关概念
    'transmission_chain': 'max',  // 事件传导链分析
    'historical_events_full': 'pro', // 历史事件对比（完整版）
    'concept_html_detail': 'pro', // 概念HTML具体内容
    'concept_stats_panel': 'pro', // 概念统计中心
    'concept_related_stocks': 'pro', // 概念相关股票
    'concept_timeline': 'max',    // 概念历史时间轴
    'hot_stocks': 'pro'          // 热门个股
};

/**
 * 订阅信息自定义 Hook (Redux 版本)
 *
 * 功能:
 * - 自动根据登录状态加载订阅信息 (从 Redux)
 * - 提供权限检查方法
 * - 提供订阅 Modal 控制方法
 *
 * @returns {{
 *   subscriptionInfo: Object,
 *   loading: boolean,
 *   error: string|null,
 *   isSubscriptionModalOpen: boolean,
 *   openSubscriptionModal: Function,
 *   closeSubscriptionModal: Function,
 *   refreshSubscription: Function,
 *   hasFeatureAccess: Function,
 *   hasSubscriptionLevel: Function,
 *   getRequiredLevel: Function,
 *   getSubscriptionStatusText: Function,
 *   getUpgradeRecommendation: Function
 * }}
 */
export const useSubscription = () => {
    const dispatch = useDispatch();
    const { user, isAuthenticated } = useAuth();

    // Redux 状态
    const subscriptionInfo = useSelector(selectSubscriptionInfo);
    const loading = useSelector(selectSubscriptionLoading);
    const loaded = useSelector(selectSubscriptionLoaded);
    const error = useSelector(selectSubscriptionError);
    const isSubscriptionModalOpen = useSelector(selectSubscriptionModalOpen);

    // 自动加载订阅信息（带防重复逻辑）
    useEffect(() => {
        if (isAuthenticated && user) {
            // 只在未加载且未在加载中时才请求，避免多个组件重复调用
            if (!loaded && !loading) {
                dispatch(fetchSubscriptionInfo());
                logger.debug('useSubscription', '加载订阅信息', { userId: user.id });
            }
        } else {
            // 用户未登录,重置为免费版
            dispatch(resetToFree());
        }
    // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [isAuthenticated, user?.id, dispatch, loaded, loading]);

    // 获取订阅级别数值
    const getSubscriptionLevel = (type = null) => {
        const subType = (type || subscriptionInfo.type || 'free').toLowerCase();
        return SUBSCRIPTION_LEVELS[subType] || 0;
    };

    // 检查是否有指定功能的权限
    const hasFeatureAccess = (featureName) => {
        // Max 用户解锁所有功能
        if (user?.subscription_type === 'max' || subscriptionInfo.type === 'max') {
            return true;
        }

        if (!subscriptionInfo.is_active) {
            return false;
        }

        const requiredLevel = FEATURE_REQUIREMENTS[featureName];
        if (!requiredLevel) {
            return true; // 如果功能不需要特定权限，默认允许
        }

        const currentLevel = getSubscriptionLevel();
        const requiredLevelNum = getSubscriptionLevel(requiredLevel);

        return currentLevel >= requiredLevelNum;
    };

    // 检查是否达到指定订阅级别
    const hasSubscriptionLevel = (requiredLevel) => {
        if (!subscriptionInfo.is_active) {
            return false;
        }

        const currentLevel = getSubscriptionLevel();
        const requiredLevelNum = getSubscriptionLevel(requiredLevel);

        return currentLevel >= requiredLevelNum;
    };

    // 获取功能所需的订阅级别
    const getRequiredLevel = (featureName) => {
        return FEATURE_REQUIREMENTS[featureName] || 'free';
    };

    // 获取订阅状态文本
    const getSubscriptionStatusText = () => {
        const type = subscriptionInfo.type || 'free';
        switch (type.toLowerCase()) {
            case 'free':
                return '免费版';
            case 'pro':
                return 'Pro版';
            case 'max':
                return 'Max版';
            default:
                return '未知';
        }
    };

    // 获取升级建议
    const getUpgradeRecommendation = (featureName) => {
        const requiredLevel = getRequiredLevel(featureName);
        const currentType = subscriptionInfo.type || 'free';

        if (hasFeatureAccess(featureName)) {
            return null;
        }

        return {
            current: currentType,
            required: requiredLevel,
            message: `此功能需要${requiredLevel === 'pro' ? 'Pro版' : 'Max版'}订阅`
        };
    };

    return {
        // 订阅信息 (来自 Redux)
        subscriptionInfo,
        loading,
        error,

        // Modal 控制
        isSubscriptionModalOpen,
        openSubscriptionModal: () => dispatch(openModal()),
        closeSubscriptionModal: () => dispatch(closeModal()),

        // 权限检查方法
        hasFeatureAccess,
        hasSubscriptionLevel,
        getRequiredLevel,
        getSubscriptionStatusText,
        getUpgradeRecommendation,

        // 手动刷新
        refreshSubscription: () => dispatch(fetchSubscriptionInfo())
    };
};