import {NextResponse} from 'next/server';
import {getUsers, getLatestPosts, Post} from '@/lib/atproto';

let allPostsCache: Post[] = [];
let lastFetchTime = 0;
const CACHE_DURATION = 30 * 1000;

export async function GET(request: Request) {
  try {
    const {searchParams} = new URL(request.url);
    const offset = parseInt(searchParams.get('offset') || '0');
    const limit = parseInt(searchParams.get('limit') || '50');
    const now = Date.now();
    if (allPostsCache.length === 0 || now - lastFetchTime > CACHE_DURATION) {
      console.log('Fetching all posts from all users...');
      const users = await getUsers();
      const postsPromises = users.map(async user => {
        return await getLatestPosts(user, 999);
      });

      const postsArrays = await Promise.all(postsPromises);

      allPostsCache = postsArrays
        .flatMap(p => p.posts)
        .sort((a, b) => {
          return new Date(b.record.createdAt).getTime() - new Date(a.record.createdAt).getTime();
        });

      lastFetchTime = now;
      console.log(`Cached ${allPostsCache.length} total posts from ${users.length} users`);
    }
    const batch = allPostsCache.slice(offset, offset + limit);
    const hasMore = offset + limit < allPostsCache.length;

    return NextResponse.json({
      posts: batch,
      hasMore,
      total: allPostsCache.length,
      offset: offset + batch.length,
    });
  } catch (error) {
    console.error('Error fetching posts:', error);
    return NextResponse.json(
      {posts: [], hasMore: false, total: 0, error: 'Failed to fetch posts'},
      {status: 500}
    );
  }
}