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feat(member): add away billing policies

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This commit is contained in:
whekin
2026-03-11 14:05:52 +04:00
parent 773abf2531
commit 98988159eb
34 changed files with 4218 additions and 39 deletions
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80
packages/application/src/settlement-engine.ts
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@@ -44,6 +44,53 @@ function ensureActiveMembers(
return active
}
function rentParticipants(
members: readonly SettlementMemberInput[]
): readonly SettlementMemberInput[] {
const participants = members.filter((member) => member.participatesInRent !== false)
if (participants.length === 0) {
throw new DomainError(
DOMAIN_ERROR_CODE.INVALID_SETTLEMENT_INPUT,
'Settlement must include at least one rent participant'
)
}
return participants
}
function utilityParticipants(
members: readonly SettlementMemberInput[],
utilities: Money
): readonly SettlementMemberInput[] {
const participants = members.filter((member) => member.participatesInUtilities !== false)
if (participants.length === 0 && utilities.amountMinor > 0n) {
throw new DomainError(
DOMAIN_ERROR_CODE.INVALID_SETTLEMENT_INPUT,
'Settlement must include at least one utilities participant when utilities are present'
)
}
return participants
}
function purchaseParticipants(
members: readonly SettlementMemberInput[],
amount: Money
): readonly SettlementMemberInput[] {
const participants = members.filter((member) => member.participatesInPurchases !== false)
if (participants.length === 0 && amount.amountMinor > 0n) {
throw new DomainError(
DOMAIN_ERROR_CODE.INVALID_SETTLEMENT_INPUT,
'Settlement must include at least one purchase participant when purchases are present'
)
}
return participants
}
function ensureNonNegativeMoney(label: string, value: Money): void {
if (value.isNegative()) {
throw new DomainError(
@@ -134,13 +181,15 @@ export function calculateMonthlySettlement(input: SettlementInput): SettlementRe
const currency = input.rent.currency
const activeMembers = ensureActiveMembers(input.members)
const rentMembers = rentParticipants(activeMembers)
const utilityMembers = utilityParticipants(activeMembers, input.utilities)
const membersById = new Map<string, ComputationMember>(
activeMembers.map((member) => [member.memberId.toString(), createMemberState(member, currency)])
)
const rentShares = input.rent.splitByWeights(validateRentWeights(activeMembers))
for (const [index, member] of activeMembers.entries()) {
const rentShares = input.rent.splitByWeights(validateRentWeights(rentMembers))
for (const [index, member] of rentMembers.entries()) {
const state = membersById.get(member.memberId.toString())
if (!state) {
continue
@@ -149,18 +198,20 @@ export function calculateMonthlySettlement(input: SettlementInput): SettlementRe
state.rentShare = rentShares[index] ?? Money.zero(currency)
}
const utilityShares =
input.utilitySplitMode === 'equal'
? input.utilities.splitEvenly(activeMembers.length)
: input.utilities.splitByWeights(validateWeightedUtilityDays(activeMembers))
if (utilityMembers.length > 0) {
const utilityShares =
input.utilitySplitMode === 'equal'
? input.utilities.splitEvenly(utilityMembers.length)
: input.utilities.splitByWeights(validateWeightedUtilityDays(utilityMembers))
for (const [index, member] of activeMembers.entries()) {
const state = membersById.get(member.memberId.toString())
if (!state) {
continue
for (const [index, member] of utilityMembers.entries()) {
const state = membersById.get(member.memberId.toString())
if (!state) {
continue
}
state.utilityShare = utilityShares[index] ?? Money.zero(currency)
}
state.utilityShare = utilityShares[index] ?? Money.zero(currency)
}
for (const purchase of input.purchases) {
@@ -176,8 +227,9 @@ export function calculateMonthlySettlement(input: SettlementInput): SettlementRe
payer.purchasePaid = payer.purchasePaid.add(purchase.amount)
const purchaseShares = purchase.amount.splitEvenly(activeMembers.length)
for (const [index, member] of activeMembers.entries()) {
const participants = purchaseParticipants(activeMembers, purchase.amount)
const purchaseShares = purchase.amount.splitEvenly(participants.length)
for (const [index, member] of participants.entries()) {
const state = membersById.get(member.memberId.toString())
if (!state) {
continue