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* CommunityScreen - 社区主页面
*
* Pinterest/小红书风格的瀑布流社区
* 支持分类筛选、收藏、搜索、用户资料查看等功能
* 设计风格：简洁现代，流畅动画，统一配色
*/
import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
import { StatusBar } from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import { router } from 'expo-router';
import { useFocusEffect } from '@react-navigation/native';
import { YStack, Stack } from 'tamagui';
import { supabaseForumService, type Post } from '@/src/lib/supabase';
import { logger } from '@/src/utils/logger';
import { useThemeColors } from '@/src/hooks/useThemeColors';
import { PostDetailScreen } from '../post-detail';
import {
ForumHeader,
CategoryTabs,
MasonryFeed,
CreatePostFAB,
type PostCardData,
type CategoryItem,
} from './index';
import { UserProfileModal } from '@/src/components/UserProfileModal';
const CATEGORIES: CategoryItem[] = [
{ id: 'recommend', label: '推荐' },
{ id: 'help', label: '求助' },
{ id: 'share', label: '分享' },
{ id: 'science', label: '科普' },
{ id: 'warning', label: '避雷' },
];
function postToCardData(post: Post): PostCardData {
const firstImage = post.media?.find((m) => m.mediaType === 'image');
const firstVideo = post.media?.find((m) => m.mediaType === 'video');
const hasVideo = !!firstVideo;
// 确定显示的图片 URL：
// 1. 优先使用图片
// 2. 如果只有视频，优先使用数据库存储的缩略图
// 3. 如果没有缩略图，传递视频 URL 让前端动态生成
let imageUrl = firstImage?.fileUrl || '';
let videoUrl: string | undefined;
let needsVideoThumbnail = false; // 标记是否需要动态生成视频缩略图
Iif (!firstImage && firstVideo) {
// 只有视频没有图片时
if (firstVideo.thumbnailUrl) {
// 使用数据库存储的缩略图
imageUrl = firstVideo.thumbnailUrl;
} else {
// 没有缩略图，传递视频 URL 让前端动态生成
videoUrl = firstVideo.fileUrl;
needsVideoThumbnail = true;
}
}
// 如果没有任何图片来源，使用占位图（仅用于纯文字帖子）
const finalImageUrl = imageUrl || (needsVideoThumbnail ? '' : 'https://placekitten.com/400/500');
return {
id: post.id,
title: post.content?.slice(0, 50) || '无标题',
imageUrl: finalImageUrl,
videoUrl, // 视频 URL，用于前端动态生成缩略图（作为后备方案）
imageHeight: firstImage || firstVideo ? undefined : Math.random() * 80 + 120,
isVideo: hasVideo,
author: {
id: post.author?.id || '0',
name: post.author?.username || '匿名用户',
avatar: post.author?.avatar || undefined,
hasReputationBadge: false,
},
likeCount: post.likesCount || 0,
viewCount: 0, // 暂未实现浏览数统计
isLiked: post.isLiked,
};
}
export function CommunityScreen() {
const insets = useSafeAreaInsets();
const colors = useThemeColors();
const [posts, setPosts] = useState<Post[]>([]);
const [isLoading, setIsLoading] = useState(true);
const [isRefreshing, setIsRefreshing] = useState(false);
const [activeCategory, setActiveCategory] = useState('recommend');
const [selectedPost, setSelectedPost] = useState<Post | null>(null);
const [selectedUserId, setSelectedUserId] = useState<string | null>(null);
const [unreadNotifications, setUnreadNotifications] = useState(0);
const cardData = useMemo(() => posts.map(postToCardData), [posts]);
/**
* 加载未读通知数量
*/
const loadUnreadCount = useCallback(async () => {
try {
const { data, error } = await supabaseForumService.getNotifications(true);
Eif (!error && data) {
setUnreadNotifications(data.length);
}
} catch (err) {
logger.error('加载未读通知数失败', err as Error);
}
}, []);
// 初始化加载未读数
useEffect(() => {
loadUnreadCount();
}, [loadUnreadCount]);
const loadPosts = useCallback(
async (refresh = false) => {
try {
if (refresh) {
setIsRefreshing(true);
// 刷新时也更新未读数
loadUnreadCount();
} else {
setIsLoading(true);
}
let result;
if (activeCategory === 'recommend') {
result = await supabaseForumService.getPosts({ order: 'latest' });
} else {
result = await supabaseForumService.getPosts({
order: 'latest',
category: activeCategory as 'help' | 'share' | 'science' | 'warning',
});
}
if (result.error) throw result.error;
setPosts(result.data || []);
} catch (error) {
logger.error('加载帖子失败', error as Error);
} finally {
setIsLoading(false);
setIsRefreshing(false);
}
},
[activeCategory, loadUnreadCount]
);
// 初始加载和标签切换时加载帖子
useEffect(() => {
const load = async () => {
try {
setIsLoading(true);
let result;
if (activeCategory === 'recommend') {
result = await supabaseForumService.getPosts({ order: 'latest' });
} else {
result = await supabaseForumService.getPosts({
order: 'latest',
category: activeCategory as 'help' | 'share' | 'science' | 'warning',
});
}
Iif (result.error) throw result.error;
setPosts(result.data || []);
} catch (error) {
logger.error('加载帖子失败', error as Error);
} finally {
setIsLoading(false);
}
};
load();
}, [activeCategory]);
// 页面获得焦点时刷新帖子列表（例如从发帖页面返回）
const isFirstFocus = useRef(true);
useFocusEffect(
useCallback(() => {
// 跳过首次加载（已经在 useEffect 中处理）
if (isFirstFocus.current) {
isFirstFocus.current = false;
return;
}
// 后续的焦点事件触发刷新
loadPosts(true);
}, [loadPosts])
);
// 处理点赞
const handleLikePress = useCallback(
async (post: PostCardData) => {
// 先乐观更新UI
const wasLiked = posts.find((p) => p.id === post.id)?.isLiked ?? false;
const prevCount = posts.find((p) => p.id === post.id)?.likesCount ?? 0;
setPosts((prev) =>
prev.map((p) =>
p.id === post.id
? {
...p,
isLiked: !wasLiked,
likesCount: wasLiked ? Math.max(0, prevCount - 1) : prevCount + 1,
}
: p
)
);
try {
const { data, error } = await supabaseForumService.toggleLike(post.id);
Iif (error) throw error;
// 用服务器返回的真实数据更新
Eif (data) {
setPosts((prev) =>
prev.map((p) =>
p.id === post.id
? {
...p,
isLiked: data.action === 'liked',
likesCount: data.likesCount ?? p.likesCount,
}
: p
)
);
}
} catch (error) {
// 出错时回滚
setPosts((prev) =>
prev.map((p) =>
p.id === post.id
? {
...p,
isLiked: wasLiked,
likesCount: prevCount,
}
: p
)
);
logger.error('点赞失败', error as Error);
}
},
[posts]
);
// 处理帖子点击
const handlePostPress = useCallback(
(post: PostCardData) => {
const fullPost = posts.find((p) => p.id === post.id);
if (fullPost) {
setSelectedPost(fullPost);
}
},
[posts]
);
// 处理搜索
const handleSearch = useCallback(
async (query: string) => {
Iif (!query.trim()) {
loadPosts(true);
return;
}
try {
setIsLoading(true);
// 检查是否是标签搜索（以 # 开头）
Iif (query.startsWith('#')) {
const tag = query.slice(1).trim();
if (tag) {
// 使用服务器端标签过滤
const { data, error } = await supabaseForumService.getPosts({
order: 'latest',
tag,
});
if (error) throw error;
setPosts(data || []);
} else {
loadPosts(true);
}
} else {
// 普通搜索：获取所有帖子并在客户端过滤
const { data, error } = await supabaseForumService.getPosts({
order: 'latest',
});
Iif (error) throw error;
const filtered = (data || []).filter(
(post) =>
post.content?.toLowerCase().includes(query.toLowerCase()) ||
post.tags?.some((tag) => tag.toLowerCase().includes(query.toLowerCase()))
);
setPosts(filtered);
}
} catch (error) {
logger.error('搜索失败', error as Error);
} finally {
setIsLoading(false);
}
},
[loadPosts]
);
// 处理创建帖子 - 跳转到独立页面
const handleCreatePost = useCallback(() => {
router.push('/(tabs)/forum/create-post');
}, []);
// 处理作者点击
const handleAuthorPress = useCallback((author: PostCardData['author']) => {
setSelectedUserId(author.id);
}, []);
// 处理帖子删除
const handlePostDeleted = useCallback(() => {
setSelectedPost(null);
loadPosts(true);
}, [loadPosts]);
// 处理从详情页编辑
const handleEditFromDetail = useCallback((post: Post) => {
setSelectedPost(null);
router.push({
pathname: '/(tabs)/forum/create-post',
params: { editPostId: post.id.toString() },
});
}, []);
return (
<YStack flex={1} backgroundColor={colors.background as any} testID="forum-screen">
<StatusBar barStyle="dark-content" />
<Stack backgroundColor={colors.cardBackground as any}>
<ForumHeader
title="社区"
unreadCount={unreadNotifications}
onSearch={handleSearch}
paddingTop={insets.top}
/>
</Stack>
<Stack backgroundColor={colors.cardBackground as any}>
<CategoryTabs
categories={CATEGORIES}
activeId={activeCategory}
onSelect={setActiveCategory}
/>
</Stack>
<Stack flex={1} backgroundColor={colors.backgroundSubtle as any}>
<MasonryFeed
data={cardData}
onPostPress={handlePostPress}
onLikePress={handleLikePress}
onAuthorPress={handleAuthorPress}
onRefresh={() => loadPosts(true)}
isLoading={isLoading}
isRefreshing={isRefreshing}
/>
</Stack>
<CreatePostFAB onPress={handleCreatePost} />
<PostDetailScreen
visible={!!selectedPost}
post={selectedPost}
onClose={() => {
setSelectedPost(null);
// 关闭详情页后刷新列表，确保状态同步
loadPosts(true);
}}
onEditPost={handleEditFromDetail}
onPostDeleted={handlePostDeleted}
/>
{selectedUserId && (
<UserProfileModal
visible={!!selectedUserId}
userId={selectedUserId}
onClose={() => setSelectedUserId(null)}
/>
)}
</YStack>
);
}
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