import { ConverterSet, ConverterType } from '../domain.js';

export const fieldMask: ConverterSet = {
  types: ['google.protobuf.FieldMask'],

  [ConverterType.TO_JSON]: {
    transform: (val: string[]) => val.join(','),

    /**
     * This one handles cases where we have a repeated google.protobuf.FieldMask type,
     * so it will look like: [['foo', 'bar'], ['qux']].
     *
     * The problem is that the serializer detects it as an array with actual fields (strings),
     * while in practice it is an array of multiple google.protobuf.FieldMask.
     *
     * We should determine if the items are actual fields (so each item is a string),
     * or arrays of google.protobuf.FieldMask (so each item is array that has items with fields).
     *
     * Another approach could be marking on the schama itseld each field if it's a repeatable or not,
     * it's not a good appraoch, but as long as google.protobuf.FieldMask is our only issue, it's
     * not _that_ bad solution.
     */
    checkRepetable: (val: string[] | string[][]) => {
      return val.some((v: string | string[]) => Array.isArray(v));
    },
  },

  [ConverterType.FROM_JSON]: {
    transform: (val: string | { paths: string[] }) => {
      /**
       * Support Scala FW JSON mapping bug, for more details see:
       *
       * https://github.com/wix-private/server-infra/issues/17953
       */
      if (typeof val === 'object') {
        return val.paths;
      }

      return val.split(',');
    },
  },
};