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* Loyalty Rewards Utility Functions
* Handles points redemption and reward management
*/
import { PrismaClient } from "@prisma/client";
import { logger } from "@/lib/logging";
const LOG_CATEGORY = "LOYALTY_REWARDS";
export interface RedeemPointsParams {
userId: number;
points: number;
description?: string;
}
export interface RedeemPointsResult {
pointsRedeemed: number;
discountValue: number;
remainingPoints: number;
transactionId: number;
}
export interface RedemptionValidation {
valid: boolean;
error?: string;
available?: number;
requested?: number;
}
/**
* Validate if a redemption is possible
*/
export async function validateRedemption(
prisma: PrismaClient,
userId: number,
points: number
): Promise<RedemptionValidation> {
try {
// Check if points is positive
if (points <= 0) {
return {
valid: false,
error: "Points must be greater than zero"};
}
// Get loyalty record
const loyalty = await prisma.customerLoyalty.findUnique({
where: { userId }});
if (!loyalty) {
return {
valid: false,
error: "No loyalty account found"};
}
// Check if user has enough points
if (loyalty.totalPoints < points) {
return {
valid: false,
error: "Insufficient points",
available: loyalty.totalPoints,
requested: points};
}
// Check if loyalty program exists
const program = await prisma.loyaltyProgram.findFirst({
where: { isActive: true }});
if (!program) {
return {
valid: false,
error: "No active loyalty program"};
}
return { valid: true };
} catch (error) {
logger.error("Error validating redemption", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Redeem points for discount
*/
export async function redeemPoints(
prisma: PrismaClient,
params: RedeemPointsParams
): Promise<RedeemPointsResult> {
try {
const { userId, points, description } = params;
// Validate redemption
const validation = await validateRedemption(prisma, userId, points);
if (!validation.valid) {
throw new Error(validation.error);
}
// Get loyalty record and program
const [loyalty, program] = await Promise.all([
prisma.customerLoyalty.findUnique({
where: { userId }}),
prisma.loyaltyProgram.findFirst({
where: { isActive: true }}),
]);
if (!loyalty || !program) {
throw new Error("Loyalty account or program not found");
}
// Calculate discount value
const discountValue = Math.round(points * program.redemptionRate * 100) / 100;
// Create redemption transaction and update balance
const result = await prisma.$transaction(async (tx) => {
const transaction = await tx.loyaltyTransaction.create({
data: {
customerLoyaltyId: loyalty.id,
type: "redeem",
points: -points,
description:
description ||
`Redeemed ${points} points for $${discountValue.toFixed(2)} discount`}});
const updatedLoyalty = await tx.customerLoyalty.update({
where: { id: loyalty.id },
data: {
totalPoints: { decrement: points }}});
return {
transactionId: transaction.id,
remainingPoints: updatedLoyalty.totalPoints};
});
logger.info("Points redeemed", {
category: LOG_CATEGORY,
userId,
points,
discountValue,
remainingPoints: result.remainingPoints});
return {
pointsRedeemed: points,
discountValue,
remainingPoints: result.remainingPoints,
transactionId: result.transactionId};
} catch (error) {
logger.error("Error redeeming points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Calculate minimum points needed for a specific discount amount
*/
export async function calculateMinimumPointsForDiscount(
prisma: PrismaClient,
discountAmount: number
): Promise<number> {
const program = await prisma.loyaltyProgram.findFirst({
where: { isActive: true }});
if (!program) {
throw new Error("No active loyalty program");
}
return Math.ceil(discountAmount / program.redemptionRate);
}
/**
* Calculate maximum discount available with current points
*/
export async function calculateMaximumDiscount(
prisma: PrismaClient,
userId: number
): Promise<number> {
const [loyalty, program] = await Promise.all([
prisma.customerLoyalty.findUnique({
where: { userId }}),
prisma.loyaltyProgram.findFirst({
where: { isActive: true }}),
]);
if (!loyalty || !program) {
return 0;
}
return Math.round(loyalty.totalPoints * program.redemptionRate * 100) / 100;
}
/**
* Award bonus points for special actions
*/
export async function awardBonusPoints(
prisma: PrismaClient,
userId: number,
points: number,
reason: string
): Promise<number> {
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) => {
await tx.loyaltyTransaction.create({
data: {
customerLoyaltyId: loyalty!.id,
type: "bonus",
points,
description: reason}});
const updated = await tx.customerLoyalty.update({
where: { id: loyalty!.id },
data: {
totalPoints: { increment: points },
lifetimePoints: { increment: points }}});
return updated.totalPoints;
});
logger.info("Bonus points awarded", {
category: LOG_CATEGORY,
userId,
points,
reason});
return result;
} catch (error) {
logger.error("Error awarding bonus points", error instanceof Error ? error : new Error(String(error)), { category: LOG_CATEGORY });
throw error;
}
}
/**
* Check if user qualifies for a specific reward tier
*/
export async function checkRewardEligibility(
prisma: PrismaClient,
userId: number,
requiredPoints: number
): Promise<boolean> {
const loyalty = await prisma.customerLoyalty.findUnique({
where: { userId }});
return loyalty ? loyalty.totalPoints >= requiredPoints : false;
}
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