import koa from 'koa';
import httpStatus from 'http-status';
import { Validator, ValidatorRules } from '../../../common/Validator';

export default function validate(rules: ValidatorRules): koa.Middleware {
  return async function(ctx, next): Promise<void> {
    const origQuery = ctx.request.query;
    const validator = new Validator(rules);
    const { result, errors } = validator.validate(origQuery);
    if (errors.length) {
      ctx.throw(httpStatus.BAD_REQUEST, errors.join('\n'));
    }
    ctx.state.query = result;
    await next();
  };
}