import { NextResponse } from 'next/server';
import path from 'path';
import { writeFile } from 'fs/promises';
import { randomUUID } from 'crypto';
import { UPLOADS_DIR } from '@/lib/db';

export const dynamic = 'force-dynamic';

const ALLOWED_TYPES: Record<string, string> = {
  'image/jpeg': 'jpg',
  'image/png': 'png',
  'image/gif': 'gif',
  'image/webp': 'webp',
};
const MAX_SIZE_BYTES = 10 * 1024 * 1024; // 10 MB

export async function POST(request: Request) {
  const formData = await request.formData();
  const file = formData.get('file');

  if (!file || !(file instanceof File)) {
    return NextResponse.json({ error: 'No file provided' }, { status: 400 });
  }
  if (!ALLOWED_TYPES[file.type]) {
    return NextResponse.json({ error: 'Invalid file type' }, { status: 400 });
  }
  if (file.size > MAX_SIZE_BYTES) {
    return NextResponse.json({ error: 'File too large (max 10 MB)' }, { status: 400 });
  }

  const ext = ALLOWED_TYPES[file.type];
  const filename = `${randomUUID()}.${ext}`;
  const buffer = Buffer.from(await file.arrayBuffer());
  await writeFile(path.join(UPLOADS_DIR, filename), buffer);

  return NextResponse.json({ filename });
}