frontend/src/navigation/MainNavigator.tsx

/**
 * 主导航组件（重构版）
 * 
 * 此文件仅保留导航器组装逻辑，所有业务逻辑已解耦至：
 * - RootNavigator: 处理根导航和认证状态
 * - DesktopNavigator: 处理桌面端侧边栏导航
 * - SimpleMobileTabNavigator: 处理移动端 Tab 导航
 * - navigationService: 提供全局导航方法
 * 
 * 原文件 1118 行已精简至约 200 行
 */

import React, { useEffect, useState } from 'react';
import { LinkingOptions } from '@react-navigation/native';
import { Platform } from 'react-native';

import type { RootStackParamList } from './types';
import { RootNavigator } from './RootNavigator';

// 导入认证 Store
import { useAuthStore } from '../stores';

// Deep linking 配置
const linking: LinkingOptions<RootStackParamList> = {
  prefixes: [],
  config: {
    screens: {
      Auth: {
        screens: {
          Login: 'login',
          Register: 'register',
          ForgotPassword: 'forgot-password',
        },
      },
      Main: {
        screens: {
          HomeTab: {
            screens: {
              Home: 'home',
              Search: 'search',
            },
          },
          MessageTab: {
            screens: {
              MessageList: 'messages',
              Notifications: 'notifications',
            },
          },
          ProfileTab: {
            screens: {
              Profile: 'me',
              Settings: 'settings',
              EditProfile: 'me/edit',
              AccountSecurity: 'me/security',
              NotificationSettings: 'me/notifications',
              BlockedUsers: 'me/blocked',
            },
          },
        },
      },
      PostDetail: 'posts/:postId',
      UserProfile: 'users/:userId',
      CreatePost: 'posts/create',
      Chat: 'chat/:conversationId',
      FollowList: 'users/:userId/:type',
    },
  },
};

/**
 * 主导航组件
 * 
 * 职责：
 * 1. 初始化认证状态
 * 2. 根据认证状态渲染 RootNavigator
 * 3. 配置 Deep Linking
 */
export default function MainNavigator() {
  const { isAuthenticated, fetchCurrentUser } = useAuthStore();
  const [isInitializing, setIsInitializing] = useState(true);

  // 初始化认证状态
  useEffect(() => {
    const initAuth = async () => {
      await fetchCurrentUser();
      setIsInitializing(false);
    };
    initAuth();
  }, [fetchCurrentUser]);

  return (
    <RootNavigator
      isAuthenticated={isAuthenticated}
      isInitializing={isInitializing}
    />
  );
}

// 导出 linking 配置供外部使用
export { linking };