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* Household Management Module
*
* Core logic for creating and managing households.
* A household groups multiple users under a single subscription —
* the owner's subscription covers all household members.
*/
import { and, eq, inArray, ne, notInArray, sql } from 'drizzle-orm'
import { db } from '@/db'
import { households, householdMembers, parentChild, players, users } from '@/db/schema'
import { createId } from '@paralleldrive/cuid2'
/** Maximum number of members in a household */
export const MAX_HOUSEHOLD_SIZE = 10
// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------
export interface HouseholdSummary {
id: string
name: string
ownerId: string
role: 'owner' | 'member'
memberCount: number
}
export interface HouseholdDetail {
id: string
name: string
ownerId: string
createdAt: Date
members: Array<{
userId: string
name: string | null
email: string | null
image: string | null
role: 'owner' | 'member'
joinedAt: Date
}>
}
// ---------------------------------------------------------------------------
// Queries
// ---------------------------------------------------------------------------
/**
* Get all households a user belongs to, with member counts.
*/
export async function getUserHouseholds(userId: string): Promise<HouseholdSummary[]> {
const rows = await db
.select({
id: households.id,
name: households.name,
ownerId: households.ownerId,
role: householdMembers.role,
memberCount: sql<number>`(
SELECT COUNT(*) FROM household_members hm2
WHERE hm2.household_id = ${households.id}
)`,
})
.from(householdMembers)
.innerJoin(households, eq(householdMembers.householdId, households.id))
.where(eq(householdMembers.userId, userId))
return rows.map((r) => ({
id: r.id,
name: r.name,
ownerId: r.ownerId,
role: r.role as 'owner' | 'member',
memberCount: Number(r.memberCount),
}))
}
/**
* Get full details of a household including all members.
*/
export async function getHouseholdDetail(householdId: string): Promise<HouseholdDetail | null> {
const household = await db.query.households.findFirst({
where: eq(households.id, householdId),
})
if (!household) return null
const members = await db
.select({
userId: householdMembers.userId,
name: users.name,
email: users.email,
image: users.image,
role: householdMembers.role,
joinedAt: householdMembers.joinedAt,
})
.from(householdMembers)
.innerJoin(users, eq(householdMembers.userId, users.id))
.where(eq(householdMembers.householdId, householdId))
return {
id: household.id,
name: household.name,
ownerId: household.ownerId,
createdAt: household.createdAt,
members: members.map((m) => ({
userId: m.userId,
name: m.name,
email: m.email,
image: m.image,
role: m.role as 'owner' | 'member',
joinedAt: m.joinedAt,
})),
}
}
/**
* Check if a user is a member of a specific household.
*/
export async function isHouseholdMember(householdId: string, userId: string): Promise<boolean> {
const row = await db.query.householdMembers.findFirst({
where: and(eq(householdMembers.householdId, householdId), eq(householdMembers.userId, userId)),
})
return !!row
}
/**
* Suggest users who share children with household members but aren't in the household.
*/
export async function getHouseholdSuggestions(householdId: string): Promise<
Array<{
userId: string
name: string | null
email: string | null
image: string | null
sharedChildren: string[]
}>
> {
// 1. Get current household member IDs
const members = await db
.select({ userId: householdMembers.userId })
.from(householdMembers)
.where(eq(householdMembers.householdId, householdId))
const memberIds = members.map((m) => m.userId)
if (memberIds.length === 0) return []
// 2. Find children of household members
const memberChildren = await db
.select({
parentUserId: parentChild.parentUserId,
childPlayerId: parentChild.childPlayerId,
})
.from(parentChild)
.where(inArray(parentChild.parentUserId, memberIds))
const childIds = [...new Set(memberChildren.map((r) => r.childPlayerId))]
if (childIds.length === 0) return []
// 3. Find other parents of those children who aren't in the household
const coParents = await db
.select({
parentUserId: parentChild.parentUserId,
childPlayerId: parentChild.childPlayerId,
})
.from(parentChild)
.where(
and(
inArray(parentChild.childPlayerId, childIds),
notInArray(parentChild.parentUserId, memberIds)
)
)
if (coParents.length === 0) return []
// 4. Group by parent, collect shared child IDs
const parentChildMap = new Map<string, Set<string>>()
for (const row of coParents) {
if (!parentChildMap.has(row.parentUserId)) {
parentChildMap.set(row.parentUserId, new Set())
}
parentChildMap.get(row.parentUserId)!.add(row.childPlayerId)
}
// 5. Look up user details
const parentIds = [...parentChildMap.keys()]
const parentUsers = await db
.select({ id: users.id, name: users.name, email: users.email, image: users.image })
.from(users)
.where(inArray(users.id, parentIds))
// 6. Resolve child player names
const allChildIds = [...new Set([...parentChildMap.values()].flatMap((s) => [...s]))]
const childPlayers =
allChildIds.length > 0
? await db
.select({ id: players.id, name: players.name })
.from(players)
.where(inArray(players.id, allChildIds))
: []
const childNameMap = new Map(childPlayers.map((p) => [p.id, p.name]))
// Only suggest users with a name or email (skip anonymous guest accounts)
return parentUsers
.filter((u) => u.name || u.email)
.map((u) => ({
userId: u.id,
name: u.name,
email: u.email,
image: u.image,
sharedChildren: [...(parentChildMap.get(u.id) || [])].map(
(id) => childNameMap.get(id) || 'Unknown'
),
}))
}
// ---------------------------------------------------------------------------
// Mutations
// ---------------------------------------------------------------------------
/**
* Create a new household with the given user as owner.
* A user can only own one household.
*/
export async function createHousehold(
ownerId: string,
name: string
): Promise<{ id: string; name: string }> {
// Enforce one-household-per-owner
const existing = await findOwnedHousehold(ownerId)
if (existing) {
throw new Error('You already own a household')
}
const id = createId()
await db.insert(households).values({
id,
name,
ownerId,
})
// Add the owner as the first member
await db.insert(householdMembers).values({
householdId: id,
userId: ownerId,
role: 'owner',
})
return { id, name }
}
/**
* Find a household owned by a specific user.
* Returns the first one found (a user could own multiple).
*/
async function findOwnedHousehold(ownerId: string) {
return db.query.households.findFirst({
where: eq(households.ownerId, ownerId),
})
}
/**
* Get the current member count for a household.
*/
async function getHouseholdMemberCount(householdId: string): Promise<number> {
const [row] = await db
.select({ count: sql<number>`COUNT(*)` })
.from(householdMembers)
.where(eq(householdMembers.householdId, householdId))
return Number(row?.count ?? 0)
}
/**
* Add a user to a household if they're not already a member.
* Idempotent — silently succeeds if already a member.
*/
async function addMemberIfNotExists(householdId: string, userId: string): Promise<void> {
const existing = await db.query.householdMembers.findFirst({
where: and(eq(householdMembers.householdId, householdId), eq(householdMembers.userId, userId)),
})
if (existing) return
await db.insert(householdMembers).values({
householdId,
userId,
role: 'member',
})
}
/**
* Add a member to a household (owner-initiated).
* Enforces the size cap and uniqueness.
*/
export async function addHouseholdMember(
householdId: string,
userId: string
): Promise<{ success: boolean; error?: string }> {
// Check size cap
const count = await getHouseholdMemberCount(householdId)
if (count >= MAX_HOUSEHOLD_SIZE) {
return { success: false, error: `Household is full (max ${MAX_HOUSEHOLD_SIZE} members)` }
}
// Check if already a member
const existing = await db.query.householdMembers.findFirst({
where: and(eq(householdMembers.householdId, householdId), eq(householdMembers.userId, userId)),
})
if (existing) {
return { success: false, error: 'User is already a member of this household' }
}
await db.insert(householdMembers).values({
householdId,
userId,
role: 'member',
})
return { success: true }
}
/**
* Remove a member from a household.
*
* Lifecycle rules:
* - Non-owner members can leave freely.
* - Owner with other members must transfer ownership first.
* - Owner as sole member → dissolves the household entirely.
*/
export async function removeHouseholdMember(
householdId: string,
userId: string
): Promise<{ success: boolean; dissolved?: boolean; error?: string }> {
const household = await db.query.households.findFirst({
where: eq(households.id, householdId),
})
if (!household) {
return { success: false, error: 'Household not found' }
}
if (household.ownerId === userId) {
const memberCount = await getHouseholdMemberCount(householdId)
if (memberCount > 1) {
return { success: false, error: 'Transfer ownership before leaving the household' }
}
// Sole owner — dissolve the household (CASCADE deletes memberships)
await db.delete(households).where(eq(households.id, householdId))
return { success: true, dissolved: true }
}
await db
.delete(householdMembers)
.where(and(eq(householdMembers.householdId, householdId), eq(householdMembers.userId, userId)))
return { success: true }
}
/**
* Transfer household ownership to another member.
* The new owner must already be a member of the household.
*/
export async function transferHouseholdOwnership(
householdId: string,
currentOwnerId: string,
newOwnerId: string
): Promise<{ success: boolean; error?: string }> {
const household = await db.query.households.findFirst({
where: eq(households.id, householdId),
})
if (!household) {
return { success: false, error: 'Household not found' }
}
if (household.ownerId !== currentOwnerId) {
return { success: false, error: 'Only the current owner can transfer ownership' }
}
// Verify new owner is a member
const newOwnerMembership = await db.query.householdMembers.findFirst({
where: and(
eq(householdMembers.householdId, householdId),
eq(householdMembers.userId, newOwnerId)
),
})
if (!newOwnerMembership) {
return { success: false, error: 'New owner must be a member of the household' }
}
// Update household owner
await db
.update(households)
.set({ ownerId: newOwnerId, updatedAt: new Date() })
.where(eq(households.id, householdId))
// Update member roles
await db
.update(householdMembers)
.set({ role: 'member' })
.where(
and(
eq(householdMembers.householdId, householdId),
eq(householdMembers.userId, currentOwnerId)
)
)
await db
.update(householdMembers)
.set({ role: 'owner' })
.where(
and(eq(householdMembers.householdId, householdId), eq(householdMembers.userId, newOwnerId))
)
return { success: true }
}
/**
* Update household name.
*/
export async function updateHouseholdName(householdId: string, name: string): Promise<void> {
await db
.update(households)
.set({ name, updatedAt: new Date() })
.where(eq(households.id, householdId))
}
// ---------------------------------------------------------------------------
// Auto-formation (called from family-manager on family code link)
// ---------------------------------------------------------------------------
/**
* Automatically create or join a household when a parent links to a child.
*
* If the child's owner already has a household, add the new parent to it.
* If not, create a household for the owner and add both.
*
* This is called from `linkParentToChild()` after a successful link.
*/
export async function autoFormHousehold(
childOwnerUserId: string,
newParentUserId: string
): Promise<void> {
// Don't form a household with yourself
if (childOwnerUserId === newParentUserId) return
// 1. Find owner's existing household (where they are owner)
let household = await findOwnedHousehold(childOwnerUserId)
// 2. If none, create one
if (!household) {
// Look up owner's name for the household name
const owner = await db.query.users.findFirst({
where: eq(users.id, childOwnerUserId),
columns: { name: true },
})
const householdName = owner?.name ? `${owner.name}'s Family` : 'My Family'
const created = await createHousehold(childOwnerUserId, householdName)
household = await db.query.households.findFirst({
where: eq(households.id, created.id),
})
if (!household) return // shouldn't happen
}
// 3. Check size cap
const memberCount = await getHouseholdMemberCount(household.id)
if (memberCount >= MAX_HOUSEHOLD_SIZE) return // silently skip
// 4. Add new parent (idempotent)
await addMemberIfNotExists(household.id, newParentUserId)
}
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