import { BadRequestException } from '@nestjs/common';

import { StorageFile } from '../../storage/storage';
import { UploadOptions } from '../options';
import { THonoRequest } from '../request';
import { FileHandler, MultipleFilesResult } from './base-handler';

export const handleMultipartMultipleFiles = async (
  req: THonoRequest,
  fieldname: string,
  maxCount: number,
  options: UploadOptions,
): Promise<MultipleFilesResult> => {
  const handler = new FileHandler(req, options);
  const files: StorageFile[] = [];

  await handler.process(async (fieldName, part) => {
    if (!(part instanceof File)) {
      throw new BadRequestException(
        `Field ${fieldName} contains invalid file data`,
      );
    }

    handler.validateFieldName(fieldName, fieldname);
    handler.validateMaxCount(fieldName, files.length, maxCount);

    const storageFile = await handler.handleSingleFile(fieldName, part);
    if (storageFile) {
      files.push(storageFile);
      handler.addFile(fieldName, storageFile);
    }
  });

  return {
    body: handler.getBody(),
    files,
    remove: handler.createRemoveFunction(),
  };
};