jmeas/redux-resource

import warning from './warning';

// Add or update resources
export default function upsertResources(
  resources,
  newResources,
  mergeResources
) {
  if (!newResources) {
    return resources;
  }

  const mergeResourcesOption =
    typeof mergeResources !== 'undefined' ? mergeResources : true;
  const shallowClone = Object.assign({}, resources);

  if (Array.isArray(newResources)) {
    newResources.forEach(resource => {
      const resourceIsObject = typeof resource === 'object';
      const id = resourceIsObject ? resource.id : resource;

      // If a resource doesn't have an ID, then it cannot be tracked
      if (!id && id !== 0) {
        if (process.env.NODE_ENV !== 'production') {
          warning(
            `You attempted to update or add a resource without an ID attribute. ` +
              `Redux Resource requires that all resources have an ID. You should ` +
              `double-check your Action Creators to make sure that all entries in ` +
              `are either an ID or an object with an "id" attribute. ` +
              `For more information, refer to the documentation on resource objects at: ` +
              `https://redux-resource.js.org/docs/resources/resource-objects.html`,
            'MISSING_ID_UPSERT'
          );
        }

        return;
      }

      const resourceObj = resourceIsObject ? resource : { id: resource };

      const resourceAlreadyExists = Boolean(resources[id]);

      // If there is no existing resource, we just add it to the resources object
      if (!resourceAlreadyExists) {
        shallowClone[id] = resourceObj;
        return shallowClone;
      }

      let resourceToInsert;
      if (mergeResourcesOption) {
        const currentResource = shallowClone[id];
        resourceToInsert = Object.assign({}, currentResource, resourceObj);
      } else {
        resourceToInsert = resourceObj;
      }

      shallowClone[id] = resourceToInsert;
    });
  } else {
    for (let id in newResources) {
      const resource = newResources[id];

      const resourceAlreadyExists = Boolean(resources[id]);

      // If there is no existing resource, we just add it to the resources object
      if (!resourceAlreadyExists) {
        shallowClone[id] = resource;
        continue;
      }

      let resourceToInsert;
      if (mergeResourcesOption) {
        const currentResource = shallowClone[id];
        resourceToInsert = Object.assign({}, currentResource, resource);
      } else {
        resourceToInsert = {
          ...resource,
        };
      }

      shallowClone[id] = resourceToInsert;
    }
  }

  return shallowClone;
}