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// @flow
import type { PaginationOptions } from '../../utils/paginate-arrays';
import type { GraphQLContext } from '../../';
import type { DBChannel } from 'shared/types';
import { getMembersInChannel } from '../../models/usersChannels';
import { encode, decode } from '../../utils/base64';
import { canViewChannel } from '../../utils/permissions';
export default async (
channel: DBChannel,
{ first, after }: PaginationOptions,
ctx: GraphQLContext
) => {
const { loaders, user: currentUser } = ctx;
const { id, isPrivate } = channel;
if (isPrivate) {
if (!(await canViewChannel(currentUser, id, loaders))) return null;
}
const cursor = decode(after);
// Get the index from the encoded cursor, asdf234gsdf-2 => ["-2", "2"]
const lastDigits = cursor.match(/-(\d+)$/);
const lastUserIndex =
lastDigits && lastDigits.length > 0 && parseInt(lastDigits[1], 10);
// $FlowIssue
return getMembersInChannel(id, { first, after: lastUserIndex })
.then(users => loaders.user.loadMany(users))
.then(result => ({
pageInfo: {
hasNextPage: result && result.length >= first,
},
edges: result.filter(Boolean).map((user, index) => ({
cursor: encode(`${user.id}-${lastUserIndex + index + 1}`),
node: user,
})),
}));
};
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