import { FieldError } from 'react-hook-form';
import { toNestError } from '@hookform/resolvers';

import { StructError, validate } from 'superstruct';
import { Resolver } from './types';

const parseErrorSchema = (error: StructError) =>
  error.failures().reduce<Record<string, FieldError>>(
    (previous, error) =>
      (previous[error.path.join('.')] = {
        message: error.message,
        type: error.type,
      }) && previous,
    {},
  );

export const superstructResolver: Resolver =
  (schema, resolverOptions) => (values, _, options) => {
    const result = validate(values, schema, resolverOptions);

    return {
      values: result[1] || {},
      errors: result[0]
        ? toNestError(parseErrorSchema(result[0]), options)
        : {},
    };
  };