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* Product Comparison Utilities
* Manages product comparison feature
*/
import { prisma } from "@/lib/prisma";
export interface ComparisonProduct {
id: number;
title: string;
price: number;
discountedPrice: number;
description: string | null;
stock: number;
rating: number;
reviewCount: number;
category: string;
images: Array<{ url: string }>;
}
/**
* Add products to comparison (max 5)
*/
export function addToComparison(
current: number[],
productId: number,
maxProducts: number = 5
): number[] {
if (current.length >= maxProducts) {
// Replace the oldest (first) one
const updated = [...current];
updated.shift();
updated.push(productId);
return updated;
}
if (!current.includes(productId)) {
return [...current, productId];
}
return current;
}
/**
* Remove product from comparison
*/
export function removeFromComparison(current: number[], productId: number): number[] {
return current.filter((id) => id !== productId);
}
/**
* Clear all comparisons
*/
export function clearComparison(): number[] {
return [];
}
/**
* Get products for comparison
*/
export async function getComparisonProducts(
productIds: number[]
): Promise<ComparisonProduct[]> {
if (!productIds || productIds.length === 0) {
return [];
}
const products = await prisma.product.findMany({
where: {
id: {
in: productIds}},
include: {
category: {
select: { title: true }},
images: {
select: { url: true },
take: 1},
reviews: {
select: { rating: true }}}});
// Map and add calculated fields
const mapped: ComparisonProduct[] = products.map((product) => {
const ratings = product.reviews.map((r) => r.rating);
const avgRating =
ratings.length > 0
? Math.round((ratings.reduce((a, b) => a + b) / ratings.length) * 10) / 10
: 0;
return {
id: product.id,
title: product.title,
price: product.price,
discountedPrice: product.discountedPrice,
description: product.description,
stock: product.stock,
rating: avgRating,
reviewCount: ratings.length,
category: product.category.title,
images: product.images};
});
// Maintain order from input
const ordered = productIds
.map((id) => mapped.find((p) => p.id === id))
.filter((p) => p !== undefined) as ComparisonProduct[];
return ordered;
}
/**
* Get comparison attributes
*/
export async function getComparisonAttributes(productIds: number[]) {
const products = await getComparisonProducts(productIds);
if (products.length === 0) {
return null;
}
// Find min/max for price
const prices = products.map((p) => p.discountedPrice);
const minPrice = Math.min(...prices);
const maxPrice = Math.max(...prices);
const attributes = {
price: {
min: minPrice,
max: maxPrice,
range: maxPrice - minPrice},
categories: [...new Set(products.map((p) => p.category))],
avgRating: {
min: Math.min(...products.map((p) => p.rating)),
max: Math.max(...products.map((p) => p.rating))},
inStock: products.filter((p) => p.stock > 0).length,
outOfStock: products.filter((p) => p.stock === 0).length};
return {
products,
attributes};
}
/**
* Check if products can be compared (same category)
*/
export async function canCompareProducts(productIds: number[]): Promise<boolean> {
if (productIds.length < 2) {
return false;
}
const products = await prisma.product.findMany({
where: {
id: { in: productIds }},
select: { categoryId: true }});
// Check if all products are in the same category
const categories = new Set(products.map((p) => p.categoryId));
return categories.size === 1;
}
/**
* Get related products for comparison
*/
export async function getRelatedComparableProducts(
productId: number,
limit: number = 5
) {
const product = await prisma.product.findUnique({
where: { id: productId },
select: { categoryId: true }});
if (!product) {
return [];
}
const related = await prisma.product.findMany({
where: {
categoryId: product.categoryId,
id: { not: productId }},
select: {
id: true,
title: true,
discountedPrice: true},
take: limit});
return related;
}
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