/* eslint-disable */
import { NextRequest, NextResponse } from 'next/server';
import fs from 'fs';
import path from 'path';
import { getDatasetsRoot } from '@/server/settings';

function isUnderRoot(filepath: string, root: string): boolean {
  const resolved = path.resolve(filepath);
  return resolved === root || resolved.startsWith(root + path.sep);
}

export async function POST(request: NextRequest) {
  let body;
  try {
    body = await request.json();
  } catch {
    return new NextResponse(null, { status: 499 });
  }

  if (request.signal.aborted) {
    return new NextResponse(null, { status: 499 });
  }

  const { imgPaths } = body as { imgPaths?: string[] };
  if (!Array.isArray(imgPaths)) {
    return NextResponse.json({ error: 'imgPaths must be an array' }, { status: 400 });
  }

  const allowedDir = await getDatasetsRoot();
  const captions: Record<string, string> = {};

  for (const imgPath of imgPaths) {
    if (typeof imgPath !== 'string') continue;
    if (!isUnderRoot(imgPath, allowedDir)) continue;

    const captionPath = imgPath.replace(/\.[^/.]+$/, '') + '.txt';
    try {
      captions[imgPath] = fs.existsSync(captionPath) ? fs.readFileSync(captionPath, 'utf-8') : '';
    } catch {
      captions[imgPath] = '';
    }
  }

  return NextResponse.json({ captions });
}