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//@flow
const { db } = require('shared/db');
export type DBDirectMessageThread = {
createdAt: Date,
id: string,
name?: string,
threadLastActive: Date,
};
// prettier-ignore
const checkForExistingDMThread = async (participants: Array<string>): Promise<?string> => {
// return a list of all threadIds where both participants are active
let idsToCheck = await db
.table('usersDirectMessageThreads')
.getAll(...participants, { index: 'userId' })
.group('threadId')
.map(row => row('userId'))
.ungroup()
.filter(row =>
row('reduction')
.count()
.eq(participants.length)
)
.pluck('group')
.run();
if (!idsToCheck || idsToCheck.length === 0) return null;
// return only the thread Ids
idsToCheck = idsToCheck.map(row => row.group);
// given a list of threads where both users are active (includes all groups)
// return only threads where these exact participants are used
return await db
.table('usersDirectMessageThreads')
.getAll(...idsToCheck, { index: 'threadId' })
.group('threadId')
.ungroup()
.filter(row =>
row('reduction')
.count()
.eq(participants.length)
)
.pluck('group')
.map(row => row('group'))
.run()
.then(results => (results && results.length > 0 ? results[0] : null));
};
// prettier-ignore
const getDirectMessageThread = (directMessageThreadId: string): Promise<DBDirectMessageThread> => {
return db
.table('directMessageThreads')
.get(directMessageThreadId)
.run()
.then(res => res && !res.deletedAt ? res : null);
};
// prettier-ignore
const getDirectMessageThreads = (ids: Array<string>): Promise<Array<DBDirectMessageThread>> => {
return db
.table('directMessageThreads')
.getAll(...ids)
.filter(row => row.hasFields('deletedAt').not())
.run();
};
const getDirectMessageThreadsByUser = (
userId: string,
// $FlowFixMe
{ first, after }
): Promise<Array<DBDirectMessageThread>> => {
return db
.table('usersDirectMessageThreads')
.getAll(userId, { index: 'userId' })
.filter(row => row.hasFields('deletedAt').not())
.eqJoin('threadId', db.table('directMessageThreads'))
.without({
left: ['id', 'createdAt', 'threadId', 'userId', 'lastActive', 'lastSeen'],
})
.zip()
.orderBy(db.desc('threadLastActive'))
.skip(after || 0)
.limit(first)
.run();
};
module.exports = {
checkForExistingDMThread,
getDirectMessageThread,
getDirectMessageThreads,
getDirectMessageThreadsByUser,
};
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