copilotkit__copilotkit/docs/app/api/debug-pager/route.ts

import { source } from '@/app/source';
import { findNeighbour } from 'fumadocs-core/page-tree';
import { patchPageTree } from '@/lib/patch-pagetree';
import { NextResponse } from 'next/server';

export async function GET() {
  const allPages = source.getPages();
  const patchedTree = patchPageTree(source.pageTree);
  
  const pagesWithNoNeighbors: Array<{
    url: string;
    title: string;
    slugs: string[];
  }> = [];
  
  const pagesWithOneNeighbor: Array<{
    url: string;
    title: string;
    slugs: string[];
    hasPrev: boolean;
    hasNext: boolean;
    prevUrl?: string;
    nextUrl?: string;
  }> = [];
  
  // Check each page for neighbors
  for (const page of allPages) {
    const { previous, next } = findNeighbour(patchedTree, page.url);
    
    const hasPrev = !!previous;
    const hasNext = !!next;
    
    if (!hasPrev && !hasNext) {
      pagesWithNoNeighbors.push({
        url: page.url,
        title: page.data.title || 'Untitled',
        slugs: Array.isArray(page.slugs) ? page.slugs : [],
      });
    } else if ((hasPrev && !hasNext) || (!hasPrev && hasNext)) {
      pagesWithOneNeighbor.push({
        url: page.url,
        title: page.data.title || 'Untitled',
        slugs: Array.isArray(page.slugs) ? page.slugs : [],
        hasPrev,
        hasNext,
        prevUrl: previous?.url,
        nextUrl: next?.url,
      });
    }
  }
  
  return NextResponse.json({
    summary: {
      totalPages: allPages.length,
      pagesWithNoNeighbors: pagesWithNoNeighbors.length,
      pagesWithOneNeighbor: pagesWithOneNeighbor.length,
      pagesWithBothNeighbors: allPages.length - pagesWithNoNeighbors.length - pagesWithOneNeighbor.length,
    },
    pagesWithNoNeighbors,
    pagesWithOneNeighbor: pagesWithOneNeighbor.slice(0, 20), // Limit to first 20 for readability
  }, {
    headers: {
      'Content-Type': 'application/json',
    },
  });
}