/**
 =========================================================
 Vision UI PRO React - v1.0.0
 =========================================================
 Product Page: https://www.creative-tim.com/product/vision-ui-dashboard-pro-react
 Copyright 2021 Creative Tim (https://www.creative-tim.com/)
 Design and Coded by Simmmple & Creative Tim
 =========================================================
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Visionware.
 */

import React, { useEffect, useRef } from "react";
import { useDispatch } from 'react-redux';
import { useLocation } from 'react-router-dom';

// Routes
import AppRoutes from './routes';

// Providers
import AppProviders from './providers/AppProviders';

// Components
import GlobalComponents from './components/GlobalComponents';

// Hooks
import { useGlobalErrorHandler } from './hooks/useGlobalErrorHandler';

// Redux
import { initializePostHog } from './store/slices/posthogSlice';

// Utils
import { logger } from './utils/logger';

// PostHog 追踪
import { trackEvent, trackEventAsync } from '@lib/posthog';

// Contexts
import { useAuth } from '@contexts/AuthContext';

/**
 * AppContent - 应用核心内容
 * 负责 PostHog 初始化和渲染路由
 */
function AppContent() {
    const dispatch = useDispatch();
    const location = useLocation();
    const { isAuthenticated } = useAuth();

    // ✅ 使用 Ref 存储页面进入时间和路径（避免闭包问题）
    const pageEnterTimeRef = useRef(Date.now());
    const currentPathRef = useRef(location.pathname);

    // 🎯 PostHog Redux 初始化
    useEffect(() => {
        dispatch(initializePostHog());
        logger.info('App', 'PostHog Redux 初始化已触发');
    }, [dispatch]);

    // ✅ 首次访问追踪
    useEffect(() => {
        const hasVisited = localStorage.getItem('has_visited');

        if (!hasVisited) {
            const urlParams = new URLSearchParams(location.search);

            // ⚡ 使用异步追踪，不阻塞页面渲染
            trackEventAsync('first_visit', {
                referrer: document.referrer || 'direct',
                utm_source: urlParams.get('utm_source'),
                utm_medium: urlParams.get('utm_medium'),
                utm_campaign: urlParams.get('utm_campaign'),
                landing_page: location.pathname,
                timestamp: new Date().toISOString()
            });

            localStorage.setItem('has_visited', 'true');
        }
    }, [location.search, location.pathname]);

    // ✅ 页面浏览时长追踪
    useEffect(() => {
        // 计算上一个页面的停留时长
        const calculateAndTrackDuration = () => {
            const exitTime = Date.now();
            const duration = Math.round((exitTime - pageEnterTimeRef.current) / 1000); // 秒

            // 只追踪停留时间 > 1 秒的页面（过滤快速跳转）
            if (duration > 1) {
                // ⚡ 使用异步追踪，不阻塞页面切换
                trackEventAsync('page_view_duration', {
                    path: currentPathRef.current,
                    duration_seconds: duration,
                    is_authenticated: isAuthenticated,
                    timestamp: new Date().toISOString()
                });
            }
        };

        // 路由切换时追踪上一个页面的时长
        if (currentPathRef.current !== location.pathname) {
            calculateAndTrackDuration();

            // 更新为新页面
            currentPathRef.current = location.pathname;
            pageEnterTimeRef.current = Date.now();
        }

        // 页面关闭/刷新时追踪时长
        const handleBeforeUnload = () => {
            calculateAndTrackDuration();
        };

        window.addEventListener('beforeunload', handleBeforeUnload);

        return () => {
            window.removeEventListener('beforeunload', handleBeforeUnload);
        };
    }, [location.pathname, isAuthenticated]);

    return <AppRoutes />;
}

/**
 * App - 应用根组件
 * 设置全局错误处理,提供 Provider 和全局组件
 */
export default function App() {
    // 全局错误处理
    useGlobalErrorHandler();

    return (
        <AppProviders>
            <AppContent />
            <GlobalComponents />
        </AppProviders>
    );
}