department-of-veterans-affairs/vets-website

import camelCaseKeysRecursive from 'camelcase-keys-recursive';
import {
  FETCH_CONSTANTS_STARTED,
  FETCH_CONSTANTS_FAILED,
  FETCH_CONSTANTS_SUCCEEDED,
} from '../actions';

const INITIAL_STATE = {
  inProgress: false,
  error: null,
  version: {},
};

export default function(state = INITIAL_STATE, action) {
  switch (action.type) {
    case FETCH_CONSTANTS_STARTED:
      return {
        ...state,
        inProgress: true,
      };
    case FETCH_CONSTANTS_FAILED:
      return {
        ...state,
        ...action.err,
        inProgress: false,
        error: action.payload,
      };
    case FETCH_CONSTANTS_SUCCEEDED: {
      const camelPayload = camelCaseKeysRecursive(action.payload);
      const constants = camelPayload.data.reduce((acc, c) => {
        const { name, value } = c.attributes;
        return { ...acc, [name]: value };
      }, {});
      return {
        ...state,
        constants,
        version: camelPayload.meta.version,
        inProgress: false,
        error: null,
      };
    }
    default:
      return state;
  }
}