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/**
* Advanced Search & Filtering Utilities
* Handles full-text search, filtering, and sorting of products
*/
import { prisma } from "@/lib/prisma";
import { Prisma } from "@prisma/client";
import { logger } from '@/lib/logging';
export interface SearchParams {
query?: string;
categories?: number[];
minPrice?: number;
maxPrice?: number;
minRating?: number;
sortBy?: "price_asc" | "price_desc" | "rating" | "newest" | "popularity";
page?: number;
limit?: number;
inStock?: boolean;
}
export interface SearchResult {
id: number;
title: string;
description: string | null;
price: number;
discountedPrice: number;
stock: number;
rating: number;
reviewCount: number;
images: Array<{
url: string;
thumbnailUrl: string;
}>;
}
export interface PaginationMeta {
page: number;
limit: number;
total: number;
totalPages: number;
hasNextPage: boolean;
hasPreviousPage: boolean;
}
/**
* Track a search term for analytics
*/
async function trackSearchTerm(term: string, resultsCount: number): Promise<void> {
if (!term || term.trim().length === 0) return;
const normalizedTerm = term.toLowerCase().trim();
try {
await prisma.searchTerm.upsert({
where: { term: normalizedTerm },
update: {
count: { increment: 1 },
lastUsed: new Date(),
resultsCount},
create: {
term: normalizedTerm,
count: 1,
resultsCount}});
} catch (error) {
// Silently fail - search tracking shouldn't break the search
logger.error('Failed to track search term', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
}
}
/**
* Search for products with advanced filtering and sorting
*/
export async function searchProducts(
params: SearchParams
): Promise<{
results: SearchResult[];
meta: PaginationMeta;
suggestions?: string[];
}> {
const {
query = "",
categories = [],
minPrice = 0,
maxPrice = Infinity,
minRating = 0,
sortBy = "newest",
page = 1,
limit = 20,
inStock = false} = params;
// Calculate pagination
const skip = (page - 1) * limit;
// Build where conditions
const where: Prisma.ProductWhereInput = {
AND: [
// Price range filter
{
price: {
gte: minPrice,
...(maxPrice !== Infinity ? { lte: maxPrice } : {})}},
// Stock filter
inStock ? { stock: { gt: 0 } } : {},
// Category filter
categories.length > 0
? {
categoryId: {
in: categories}}
: {},
// Search query
query
? {
OR: [
{
title: {
contains: query}},
{
description: {
contains: query}},
]}
: {},
]};
// Remove empty AND conditions
if (Array.isArray(where.AND)) {
where.AND = where.AND.filter((condition) => {
if (typeof condition === "object" && condition !== null && Object.keys(condition).length === 0) {
return false;
}
return true;
});
}
// If AND array is empty, remove it
if (where.AND && Array.isArray(where.AND) && where.AND.length === 0) {
delete where.AND;
}
// Determine sorting
let orderBy: Prisma.ProductOrderByWithRelationInput = { createdAt: "desc" }; // Default: newest
switch (sortBy) {
case "price_asc":
orderBy = { discountedPrice: "asc" };
break;
case "price_desc":
orderBy = { discountedPrice: "desc" };
break;
case "rating":
// Sort by newest first (we'll filter by rating in-memory)
orderBy = { createdAt: "desc" };
break;
case "popularity":
// Sort by stock (assuming popular items sell more)
orderBy = { stock: "desc" };
break;
case "newest":
default:
orderBy = { createdAt: "desc" };
}
try {
// Get total count for pagination
const total = await prisma.product.count({ where });
// Get products
const products = await prisma.product.findMany({
where,
select: {
id: true,
title: true,
description: true,
price: true,
discountedPrice: true,
stock: true,
images: {
select: {
url: true,
thumbnailUrl: true}},
reviews: {
select: {
rating: true}}},
orderBy,
skip,
take: limit});
// Transform results with calculated fields
let results: SearchResult[] = products.map((product) => {
const ratings = product.reviews.map((r) => r.rating);
const averageRating =
ratings.length > 0
? ratings.reduce((a, b) => a + b, 0) / ratings.length
: 0;
return {
id: product.id,
title: product.title,
description: product.description,
price: product.price,
discountedPrice: product.discountedPrice,
stock: product.stock,
rating: Math.round(averageRating * 10) / 10,
reviewCount: product.reviews.length,
images: product.images};
});
// Apply rating filter if specified
if (minRating > 0) {
results = results.filter(p => p.rating >= minRating);
}
// Sort by rating if requested (after filtering)
if (sortBy === "rating") {
results.sort((a, b) => b.rating - a.rating);
}
// Track search term
if (query) {
void trackSearchTerm(query, results.length);
}
// Calculate pagination metadata
const totalPages = Math.ceil(total / limit);
const meta: PaginationMeta = {
page,
limit,
total,
totalPages,
hasNextPage: page < totalPages,
hasPreviousPage: page > 1};
return {
results,
meta};
} catch (error) {
logger.error("Search failed", error instanceof Error ? error : new Error(String(error)), { category: "SEARCH" });
throw new Error("Search failed");
}
}
/**
* Get search suggestions based on query
*/
export async function getSearchSuggestions(
query: string,
limit: number = 10
): Promise<string[]> {
if (!query || query.length < 2) {
return [];
}
try {
// Get products that match the query
const products = await prisma.product.findMany({
where: {
OR: [
{
title: {
contains: query}},
{
description: {
contains: query}},
]},
select: {
title: true},
take: limit});
// Extract unique titles as suggestions
const suggestions = [...new Set(products.map((p) => p.title))];
return suggestions;
} catch (error) {
logger.error("Suggestions error", error instanceof Error ? error : new Error(String(error)), { category: "SEARCH" });
return [];
}
}
/**
* Get available filter options
*/
export async function getFilterOptions(): Promise<{
categories: Array<{ id: number; title: string; count: number }>;
priceRange: { min: number; max: number };
ratings: number[];
}> {
try {
// Get categories with product count
const categories = await prisma.category.findMany({
select: {
id: true,
title: true,
_count: {
select: { products: true }}}});
// Get price range
const priceStats = await prisma.product.aggregate({
_min: { discountedPrice: true },
_max: { discountedPrice: true }});
return {
categories: categories.map((cat) => ({
id: cat.id,
title: cat.title,
count: cat._count.products})),
priceRange: {
min: priceStats._min.discountedPrice || 0,
max: priceStats._max.discountedPrice || 0},
ratings: [5, 4, 3, 2, 1]};
} catch (error) {
logger.error("Filter options error", error instanceof Error ? error : new Error(String(error)), { category: "SEARCH" });
throw new Error("Failed to fetch filter options");
}
}
/**
* Calculate average rating for a product
*/
export function calculateAverageRating(reviews: Array<{ rating: number }>): {
average: number;
total: number;
} {
if (reviews.length === 0) {
return { average: 0, total: 0 };
}
const sum = reviews.reduce((acc, review) => acc + review.rating, 0);
const average = Math.round((sum / reviews.length) * 10) / 10;
return {
average,
total: reviews.length};
}
/**
* Get popular search terms
*/
export async function getPopularSearchTerms(limit: number = 10): Promise<Array<{
term: string;
count: number;
}>> {
try {
const searchTerms = await prisma.searchTerm.findMany({
select: {
term: true,
count: true},
orderBy: {
count: 'desc'},
take: limit});
return searchTerms;
} catch (error) {
logger.error('Popular search terms error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return [];
}
}
/**
* Get trending search terms (recent popular searches)
*/
export async function getTrendingSearchTerms(limit: number = 10): Promise<Array<{
term: string;
count: number;
}>> {
try {
// Get searches from the last 7 days
const sevenDaysAgo = new Date();
sevenDaysAgo.setDate(sevenDaysAgo.getDate() - 7);
const searchTerms = await prisma.searchTerm.findMany({
where: {
lastUsed: {
gte: sevenDaysAgo}},
select: {
term: true,
count: true},
orderBy: {
count: 'desc'},
take: limit});
return searchTerms;
} catch (error) {
logger.error('Trending search terms error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return [];
}
}
/**
* Get search analytics
*/
export async function getSearchAnalytics(): Promise<{
totalSearches: number;
uniqueTerms: number;
avgResultsPerSearch: number;
topTerms: Array<{ term: string; count: number }>;
zeroResultTerms: Array<{ term: string; count: number }>;
}> {
try {
const [allTerms, topTerms, zeroResultTerms] = await Promise.all([
prisma.searchTerm.findMany({
select: {
count: true,
resultsCount: true}}),
prisma.searchTerm.findMany({
select: {
term: true,
count: true},
orderBy: {
count: 'desc'},
take: 10}),
prisma.searchTerm.findMany({
where: {
resultsCount: 0},
select: {
term: true,
count: true},
orderBy: {
count: 'desc'},
take: 10}),
]);
const totalSearches = allTerms.reduce((sum, term) => sum + term.count, 0);
const totalResults = allTerms.reduce((sum, term) => sum + term.resultsCount, 0);
return {
totalSearches,
uniqueTerms: allTerms.length,
avgResultsPerSearch: totalSearches > 0 ? Math.round(totalResults / totalSearches) : 0,
topTerms,
zeroResultTerms};
} catch (error) {
logger.error('Search analytics error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return {
totalSearches: 0,
uniqueTerms: 0,
avgResultsPerSearch: 0,
topTerms: [],
zeroResultTerms: []};
}
}
/**
* Clear old search terms (cleanup utility)
*/
export async function clearOldSearchTerms(daysOld: number = 90): Promise<{ deleted: number }> {
try {
const cutoffDate = new Date();
cutoffDate.setDate(cutoffDate.getDate() - daysOld);
const result = await prisma.searchTerm.deleteMany({
where: {
lastUsed: {
lt: cutoffDate},
count: {
lt: 5, // Only delete terms with low search count
}}});
return { deleted: result.count };
} catch (error) {
logger.error('Clear search terms error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return { deleted: 0 };
}
}
/**
* Search products by category
*/
export async function searchByCategory(
categoryId: number,
params: Omit<SearchParams, 'categories'> = {}
): Promise<{
results: SearchResult[];
meta: PaginationMeta;
}> {
return searchProducts({
...params,
categories: [categoryId]});
}
/**
* Get related search terms
*/
export async function getRelatedSearchTerms(query: string, limit: number = 5): Promise<string[]> {
if (!query || query.length < 2) {
return [];
}
try {
const terms = await prisma.searchTerm.findMany({
where: {
term: {
contains: query.toLowerCase()}},
select: {
term: true},
orderBy: {
count: 'desc'},
take: limit});
return terms.map(t => t.term);
} catch (error) {
logger.error('Related search terms error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return [];
}
}
/**
* Check zero-result searches and update if products now match
* Returns the number of search terms that now have results
*/
export async function checkZeroResultSearches(): Promise<{ updated: number }> {
try {
// Get searches with zero results
const zeroResultSearches = await prisma.searchTerm.findMany({
where: { resultsCount: 0 },
select: { term: true }});
let updated = 0;
for (const search of zeroResultSearches) {
const { results } = await searchProducts({ query: search.term, limit: 1 });
if (results.length > 0) {
// Update search term with new result count
const fullResults = await searchProducts({ query: search.term, limit: 100 });
await prisma.searchTerm.update({
where: { term: search.term },
data: { resultsCount: fullResults.results.length }});
// TODO: Optionally notify users who searched for this term
// Requires tracking user-search associations
updated++;
}
}
return { updated };
} catch (error) {
logger.error('Check zero-result searches error', error instanceof Error ? error : new Error(String(error)), { category: 'SEARCH' });
return { updated: 0 };
}
}
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