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* Loyalty Points Utility Functions
* Handles points calculation, earning, and expiration logic
*/
import { PrismaClient } from "@prisma/client";
import { logger } from "@/lib/logging";
const LOG_CATEGORY = "LOYALTY_POINTS";
export interface PointsCalculationResult {
basePoints: number;
bonusPoints: number;
totalPoints: number;
multiplier: number;
}
export interface EarnPointsParams {
userId: number;
orderAmount: number;
orderId?: number;
description?: string;
}
export interface EarnPointsResult {
pointsEarned: number;
newBalance: number;
transactionId: number;
}
/**
* Calculate points earned for a purchase
* Applies tier multiplier and any applicable bonus rules
*/
export async function calculatePointsForPurchase(
prisma: PrismaClient,
userId: number,
orderAmount: number
): Promise<PointsCalculationResult> {
try {
// Get active loyalty program
const program = await prisma.loyaltyProgram.findFirst({
where: { isActive: true },
include: {
tiers: { orderBy: { minPoints: "asc" } },
bonusRules: { where: { isActive: true } }}});
if (!program) {
return {
basePoints: 0,
bonusPoints: 0,
totalPoints: 0,
multiplier: 1};
}
// Get customer loyalty record
const loyalty = await prisma.customerLoyalty.findUnique({
where: { userId }});
// Calculate base points
const basePoints = Math.floor(orderAmount * program.pointsPerDollar);
// Find current tier and apply multiplier
let multiplier = 1;
if (loyalty && program.tiers.length > 0) {
for (const tier of program.tiers) {
if (loyalty.lifetimePoints >= tier.minPoints) {
multiplier = tier.pointsMultiplier;
}
}
}
// Apply tier multiplier
const multipliedPoints = Math.floor(basePoints * multiplier);
// Calculate bonus points from bonus rules
let bonusPoints = 0;
for (const rule of program.bonusRules) {
// Apply bonus points for active rules
// triggerType determines when the bonus applies (e.g., "category_purchase")
// For now, we apply the bonusPoints directly if the rule is active
if (rule.isActive) {
bonusPoints += rule.bonusPoints;
}
}
const totalPoints = multipliedPoints + bonusPoints;
return {
basePoints,
bonusPoints,
totalPoints,
multiplier};
} catch (error) {
logger.error("Error calculating points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Award points to a customer
* Creates loyalty record if it doesn't exist
*/
export async function earnPoints(
prisma: PrismaClient,
params: EarnPointsParams
): Promise<EarnPointsResult> {
try {
const { userId, orderAmount, orderId, description } = params;
// Calculate points
const calculation = await calculatePointsForPurchase(prisma, userId, orderAmount);
const pointsEarned = calculation.totalPoints;
// Get or create loyalty record
let loyalty = await prisma.customerLoyalty.findUnique({
where: { userId }});
if (!loyalty) {
loyalty = await prisma.customerLoyalty.create({
data: {
userId,
totalPoints: 0,
lifetimePoints: 0}});
}
// Create transaction and update balance in a transaction
const result = await prisma.$transaction(async (tx) => {
const transaction = await tx.loyaltyTransaction.create({
data: {
customerLoyaltyId: loyalty!.id,
type: "earn",
points: pointsEarned,
description: description || `Earned ${pointsEarned} points from purchase`,
orderId}});
const updatedLoyalty = await tx.customerLoyalty.update({
where: { id: loyalty!.id },
data: {
totalPoints: { increment: pointsEarned },
lifetimePoints: { increment: pointsEarned }}});
return {
transactionId: transaction.id,
newBalance: updatedLoyalty.totalPoints};
});
logger.info("Points earned", {
category: LOG_CATEGORY,
userId,
pointsEarned,
newBalance: result.newBalance});
return {
pointsEarned,
newBalance: result.newBalance,
transactionId: result.transactionId};
} catch (error) {
logger.error("Error earning points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Expire points based on expiration date
*/
export async function expirePoints(
prisma: PrismaClient,
userId: number
): Promise<number> {
try {
const loyalty = await prisma.customerLoyalty.findUnique({
where: { userId },
include: {
transactions: {
where: {
type: "earn",
expiresAt: { lte: new Date() },
points: { gt: 0 }}}}});
if (!loyalty || loyalty.transactions.length === 0) {
return 0;
}
// Calculate total points to expire
const pointsToExpire = loyalty.transactions.reduce(
(sum, tx) => sum + tx.points,
0
);
// Create expiration transactions and update balance
await prisma.$transaction(async (tx) => {
// Mark original transactions as expired
for (const transaction of loyalty.transactions) {
await tx.loyaltyTransaction.create({
data: {
customerLoyaltyId: loyalty.id,
type: "expire",
points: -transaction.points,
description: `Expired ${transaction.points} points`}});
}
// Update balance
await tx.customerLoyalty.update({
where: { id: loyalty.id },
data: {
totalPoints: { decrement: pointsToExpire }}});
});
logger.info("Points expired", {
category: LOG_CATEGORY,
userId,
pointsExpired: pointsToExpire});
return pointsToExpire;
} catch (error) {
logger.error("Error expiring points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Adjust points manually (admin function)
*/
export async function adjustPoints(
prisma: PrismaClient,
userId: number,
points: number,
reason: string,
adjustLifetime: boolean = false
): Promise<EarnPointsResult> {
try {
let loyalty = await prisma.customerLoyalty.findUnique({
where: { userId }});
if (!loyalty) {
loyalty = await prisma.customerLoyalty.create({
data: {
userId,
totalPoints: 0,
lifetimePoints: 0}});
}
const result = await prisma.$transaction(async (tx) => {
const transaction = await tx.loyaltyTransaction.create({
data: {
customerLoyaltyId: loyalty!.id,
type: "adjust",
points,
description: reason}});
const updateData: {
totalPoints: { increment: number };
lifetimePoints?: { increment: number };
} = {
totalPoints: { increment: points }};
if (adjustLifetime && points > 0) {
updateData.lifetimePoints = { increment: points };
}
const updatedLoyalty = await tx.customerLoyalty.update({
where: { id: loyalty!.id },
data: updateData});
return {
transactionId: transaction.id,
newBalance: updatedLoyalty.totalPoints};
});
logger.info("Points adjusted", {
category: LOG_CATEGORY,
userId,
points,
reason,
newBalance: result.newBalance});
return {
pointsEarned: points,
newBalance: result.newBalance,
transactionId: result.transactionId};
} catch (error) {
logger.error("Error adjusting points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Get points value in dollars
*/
export async function getPointsValue(
prisma: PrismaClient,
points: number
): Promise<number> {
const program = await prisma.loyaltyProgram.findFirst({
where: { isActive: true }});
const redemptionRate = program?.redemptionRate || 0.01;
return Math.round(points * redemptionRate * 100) / 100;
}
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