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

export const duration: ConverterSet = {
  types: ['google.protobuf.Duration'],

  [ConverterType.TO_JSON]: {
    transform: ({ seconds = '0', nanos = 0 }: GoogleProtoDuration) => {
      let nanosPortion = '';

      if (nanos !== 0) {
        nanosPortion = `.${nanos.toString().padStart(9, '0')}`;
      }

      return `${seconds}${nanosPortion}s`;
    },
  },

  [ConverterType.FROM_JSON]: {
    transform: (val: string): GoogleProtoDuration => {
      const [seconds, nanos] = val.substring(0, val.length - 1).split('.');

      return {
        seconds,
        nanos: nanosForString(nanos),
      };
    },
  },
};

function nanosForString(nanos: string) {
  let res = 0;

  if (nanos !== undefined) {
    const precision = 3 - nanos.length / 3;
    res = parseInt(nanos, 10) * Math.pow(1000, precision);
  }

  return res;
}