todo/data/schema/mutations/RemoveCompletedTodosMutation.js

// @flow
/* graphql-relay doesn't export types, and isn't in flow-typed.  This gets too messy */
/* eslint flowtype/require-return-type: 'off' */

import {mutationWithClientMutationId, toGlobalId} from 'graphql-relay';
import {
  GraphQLID,
  GraphQLList,
  GraphQLNonNull,
  type GraphQLFieldConfig,
} from 'graphql';
import {GraphQLUser} from '../nodes';
import {getUserOrThrow, removeCompletedTodos, User} from '../../database';

type Input = {|
  +userId: string,
|};

type Payload = {|
  +deletedTodoIds: $ReadOnlyArray<string>,
  +userId: string,
|};

const RemoveCompletedTodosMutation: GraphQLFieldConfig<$FlowFixMe, $FlowFixMe> =
  mutationWithClientMutationId({
    name: 'RemoveCompletedTodos',
    inputFields: {
      userId: {type: new GraphQLNonNull(GraphQLID)},
    },
    outputFields: {
      deletedTodoIds: {
        type: new GraphQLList(new GraphQLNonNull(GraphQLID)),
        resolve: ({deletedTodoIds}: Payload): $ReadOnlyArray<string> =>
          deletedTodoIds,
      },
      user: {
        type: new GraphQLNonNull(GraphQLUser),
        resolve: ({userId}: Payload): User => getUserOrThrow(userId),
      },
    },
    mutateAndGetPayload: ({userId}: Input): Payload => {
      const deletedTodoLocalIds = removeCompletedTodos();

      const deletedTodoIds = deletedTodoLocalIds.map(
        toGlobalId.bind(null, 'Todo'),
      );

      return {deletedTodoIds, userId};
    },
  });

export {RemoveCompletedTodosMutation};