import PolymorphicSchema from './Polymorphic.js';
import { filterEmpty, getValues } from './utils.js';
import { IDenormalizeDelegate, Visit } from '../interface.js';

/**
 * Represents arrays
 * @see https://dataclient.io/rest/api/Array
 */
export default class ArraySchema extends PolymorphicSchema {
  normalize(
    input: any,
    parent: any,
    key: any,
    delegate: { visit: Visit },
  ): any {
    const values = getValues(input);

    return values.map(value =>
      this.normalizeValue(value, parent, key, delegate),
    );
  }

  denormalize(input: any, delegate: IDenormalizeDelegate) {
    return input.map ?
        input
          .map((entityOrId: any) =>
            this.denormalizeValue(entityOrId, delegate.unvisit),
          )
          .filter(filterEmpty)
      : input;
  }

  queryKey(args: any, unvisit: any, delegate: any): undefined {
    return undefined;
  }

  toJSON() {
    return [this.schema];
  }
}