import { MulterOptions } from "@nestjs/platform-express/multer/interfaces/multer-options.interface";

/**
 * Ceiling for a single uploaded document, in bytes.
 *
 * Mirrors the 50MB `max_size_mb` the file-upload settings hand the portal, so
 * the client-side gate and the server-side cap agree. Raising this alone is not
 * enough to accept a 50MB upload: the reverse proxy in front of the API applies
 * its own `client_max_body_size`, and nginx's 1MB default rejects the request
 * with a 413 before it ever reaches Nest (see docs/uploads.md).
 */
export const DOCUMENT_UPLOAD_MAX_BYTES = 50 * 1024 * 1024;

/** Upper bound on parts in one multipart document post. */
export const DOCUMENT_UPLOAD_MAX_FILES = 20;

/**
 * Multer caps for the document upload routes.
 *
 * Without an explicit `fileSize`, multer's default is unlimited and every byte
 * is buffered in memory, so an oversized post is absorbed in full before
 * anything can reject it. With the limit set, multer stops reading the socket
 * at the ceiling instead.
 */
export const documentUploadMulterOptions: MulterOptions = {
  limits: {
    fileSize: DOCUMENT_UPLOAD_MAX_BYTES,
    files: DOCUMENT_UPLOAD_MAX_FILES,
  },
};