import {
  BadRequestException,
  Injectable,
  // Logger,
  PipeTransform,
} from '@nestjs/common';

@Injectable()
export class ValidateSearchPipe implements PipeTransform {
  constructor(
    private model: any,
    private additionalAttributes: string[] = [],
  ) {}

  transform(value: string) {
    let search = {};

    if (value) {
      try {
        search = JSON.parse(value);
      } catch (err) {
        throw new BadRequestException('Bad value for search.');
      }
      const attributes: string[] = [
        ...this.additionalAttributes,
        ...Object.keys(this.model.tableAttributes),
      ];
      const searchAttributes: string[] = Object.keys(search);
      const invalidKeys = searchAttributes.filter(
        (attr) => !attributes.includes(attr),
      );

      if (invalidKeys.length > 0) {
        throw new BadRequestException(
          `${invalidKeys} ${
            invalidKeys.length > 1 ? 'are invalid keys' : 'is an invalid key'
          } for search query`,
        );
      }
    }

    return value;
  }
}