import { isArray } from 'lodash';

/**
 * Ids generated by GraphQL endpoints are usually in the format
 * gid://gitlab/Environments/123. This method extracts Id number
 * from the Id path
 *
 * @param {String} gid GraphQL global ID
 * @returns {Number}
 */
export const getIdFromGraphQLId = (gid = '') =>
  parseInt(`${gid}`.replace(/gid:\/\/gitlab\/.*\//g, ''), 10) || null;

export const MutationOperationMode = {
  Append: 'APPEND',
  Remove: 'REMOVE',
  Replace: 'REPLACE',
};

/**
 * Possible GraphQL entity types.
 */
export const TYPE_GROUP = 'Group';

/**
 * Ids generated by GraphQL endpoints are usually in the format
 * gid://gitlab/Groups/123. This method takes a type and an id
 * and interpolates the 2 values into the expected GraphQL ID format.
 *
 * @param {String} type The entity type
 * @param {String|Number} id The id value
 * @returns {String}
 */
export const convertToGraphQLId = (type, id) => {
  if (typeof type !== 'string') {
    throw new TypeError(`type must be a string; got ${typeof type}`);
  }

  if (!['number', 'string'].includes(typeof id)) {
    throw new TypeError(`id must be a number or string; got ${typeof id}`);
  }

  return `gid://gitlab/${type}/${id}`;
};

/**
 * Ids generated by GraphQL endpoints are usually in the format
 * gid://gitlab/Groups/123. This method takes a type and an
 * array of ids and tranforms the array values into the expected
 * GraphQL ID format.
 *
 * @param {String} type The entity type
 * @param {Array} ids An array of id values
 * @returns {Array}
 */
export const convertToGraphQLIds = (type, ids) => ids.map((id) => convertToGraphQLId(type, id));

/**
 * Ids generated by GraphQL endpoints are usually in the format
 * gid://gitlab/Groups/123. This method takes an array of
 * GraphQL Ids and converts them to a number.
 *
 * @param {Array} ids An array of GraphQL IDs
 * @returns {Array}
 */
export const convertFromGraphQLIds = (ids) => {
  if (!isArray(ids)) {
    throw new TypeError(`ids must be an array; got ${typeof ids}`);
  }

  return ids.map((id) => getIdFromGraphQLId(id));
};

/**
 * Ids generated by GraphQL endpoints are usually in the format
 * gid://gitlab/Groups/123. This method takes an array of nodes
 * and converts the `id` properties from a GraphQL Id to a number.
 *
 * @param {Array} nodes An array of nodes with an `id` property
 * @returns {Array}
 */
export const convertNodeIdsFromGraphQLIds = (nodes) => {
  if (!isArray(nodes)) {
    throw new TypeError(`nodes must be an array; got ${typeof nodes}`);
  }

  return nodes.map((node) => (node.id ? { ...node, id: getIdFromGraphQLId(node.id) } : node));
};