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import {
Injectable,
Logger,
OnModuleInit,
Inject,
NotFoundException,
} from "@nestjs/common";
import { PrismaService } from "@app/modules/prisma/prisma.service";
import { Client as ESClient } from "@elastic/elasticsearch";
import { ELASTICSEARCH_CLIENT } from "@app/modules/search/elasticsearch.module";
import { SaveSearchDto } from "@app/modules/search/dto/save-search.dto";
import { SearchFilterInput } from "@app/modules/search/dto/search-filter.input";
import { SearchResult } from '@app/modules/search/dto/search-result.object';
// Removed unused import
export interface SearchServiceResponse {
resultIds: string[];
facets?: Record<string, any>;
searchAfter?: (string | number)[];
}
import {
FilterManifestResponse,
FilterDefinition,
} from '@app/modules/search/dto/filter-manifest.dto';
import { SearchResponse } from '@elastic/elasticsearch/lib/api/types';
import NodeGeocoder from 'node-geocoder';
import * as regionsData from '@app/data/regions.json';
const LISTINGS_INDEX = "listings";
const AUTOCOMPLETE_INDEX = "listings-autocomplete";
const BULK_CHUNK_SIZE = 1000;
const BOOST_WEIGHTS: Record<string, number> = {
STANDARD: 1.0,
PREMIUM: 1.3,
DIAMOND: 1.6,
};
// Future-proof against Prisma client type changes by using minimal local types
const fullListingInclude = {
include: {
address: true,
user: { include: { agency: true } },
photos: true,
boosts: { where: { active: true } },
openHouses: true,
amenities: true,
},
} as const;
type FullListing = {
id: number;
title: string;
description: string;
type: string;
transactionType: string;
price: number;
currency: string;
area: number | null;
floor: number | null;
rooms: number | null;
totalFloors?: number | null;
elevator?: boolean | null;
balcony?: boolean | null;
furnished?: boolean | null;
renovated?: boolean | null;
createdAt: Date;
address: { id: number; city: string; country: string; street?: string | null; latitude?: number | null; longitude?: number | null };
user: { role?: string; agencyId?: number | null; agency?: { isVerified?: boolean | null } | null };
photos: Array<{ url: string }>;
boosts: Array<{ tier: keyof typeof BOOST_WEIGHTS }>;
openHouses?: Array<{ startTime: Date; endTime: Date }>;
};
@Injectable()
export class SearchService implements OnModuleInit {
private readonly logger = new Logger(SearchService.name);
private geocoder: NodeGeocoder.Geocoder;
private regionsData: any = (regionsData as any).regions;
constructor(
@Inject(ELASTICSEARCH_CLIENT) private readonly es: ESClient,
private readonly prisma: PrismaService,
) {
this.geocoder = NodeGeocoder({
provider: 'openstreetmap',
formatter: null,
});
}
async onModuleInit() {
await this.ensureIndexesAndMappings();
}
async ensureIndexesAndMappings() {
await this.createListingsIndex();
await this.createAutocompleteIndex();
}
private async createListingsIndex() {
const exists = await this.es.indices.exists({ index: LISTINGS_INDEX });
if (exists) {
this.logger.log(`Index ${LISTINGS_INDEX} already exists.`);
return;
}
await this.es.indices.create({
index: LISTINGS_INDEX,
mappings: {
properties: {
id: { type: "keyword" },
title: {
type: "search_as_you_type",
max_shingle_size: 3,
},
description: { type: "text", analyzer: "standard" },
type: { type: "keyword" },
transactionType: { type: "keyword" },
price: { type: "float" },
currency: { type: "keyword" },
area: { type: "float" },
floor: { type: "integer" },
rooms: { type: "integer" },
location: { type: "geo_point" },
city: { type: "keyword" },
country: { type: "keyword" },
postedBy: { type: "keyword" },
agencyId: { type: "keyword" },
isVerified: { type: "boolean" },
hasPhotos: { type: "boolean" },
createdAt: { type: "date" },
nextOpenHouseDate: { type: "date" },
boostWeight: { type: "float" },
// Derived fields for filtering/sorting/facets
price_base: { type: "float" }, // price in a base currency (e.g., USD)
price_per_sqm: { type: "float" },
districtId: { type: "keyword" },
floors_total: { type: "integer" },
has_elevator: { type: "boolean" },
has_balcony: { type: "boolean" },
is_furnished: { type: "boolean" },
is_renovated: { type: "boolean" },
},
},
});
this.logger.log(`Created index mapping for ${LISTINGS_INDEX}`);
}
private async createAutocompleteIndex() {
const exists = await this.es.indices.exists({ index: AUTOCOMPLETE_INDEX });
if (exists) {
this.logger.log(`Index ${AUTOCOMPLETE_INDEX} already exists.`);
return;
}
await this.es.indices.create({
index: AUTOCOMPLETE_INDEX,
mappings: {
properties: {
city: { type: "search_as_you_type" },
country: { type: "search_as_you_type" },
street: { type: "search_as_you_type" },
},
},
});
this.logger.log(`Created index mapping for ${AUTOCOMPLETE_INDEX}`);
}
async indexAllListings() {
const listings: FullListing[] = (await this.prisma.client.listing.findMany({
...(fullListingInclude as any),
})) as any;
if (listings.length === 0) {
this.logger.log("No listings to index.");
return;
}
const listingBody = (await Promise.all(
listings.map((l) => this.buildListingDocument(l)),
)).flat();
const locationBody = listings.flatMap((l) => this.buildLocationDocument(l));
await this.bulkIndex(LISTINGS_INDEX, listingBody);
await this.bulkIndex(AUTOCOMPLETE_INDEX, locationBody);
this.logger.log(`Indexed ${listings.length} listings and locations.`);
}
private async buildListingDocument(l: FullListing) {
const { latitude, longitude } = l.address;
Iif (latitude == null || longitude == null) return [];
let postedBy = "private";
Iif (l.user && (l.user as any).role === 'AGENT') postedBy = "agent";
else Iif (l.user && (l.user as any).role === 'DEVELOPER') postedBy = "developer";
return [
{ index: { _index: LISTINGS_INDEX, _id: l.id.toString() } },
{
id: l.id.toString(),
title: l.title,
description: l.description,
type: l.type,
transactionType: l.transactionType,
price: l.price,
currency: l.currency,
area: l.area,
floor: l.floor,
rooms: l.rooms,
location: { lat: latitude, lon: longitude },
city: l.address.city,
country: l.address.country,
postedBy: postedBy,
agencyId: l.user.agencyId?.toString(),
isVerified: (l as any).isVerified || l.user?.agency?.isVerified || false,
hasPhotos: l.photos.length > 0,
createdAt: l.createdAt,
nextOpenHouseDate:
(l.openHouses as Array<{ startTime: Date; endTime: Date }> | undefined)
?.filter((oh: { endTime: Date }) => oh.endTime > new Date())
.sort(
(
a: { startTime: Date },
b: { startTime: Date },
) => a.startTime.getTime() - b.startTime.getTime(),
)[0]
?.startTime ?? null,
boostWeight:
l.boosts && l.boosts.length > 0
? BOOST_WEIGHTS[l.boosts[0].tier]
: 1.0,
// Add derived fields
price_base: this.convertToBaseCurrency(l.price, l.currency),
price_per_sqm:
l.area && l.area > 0
? this.convertToBaseCurrency(l.price, l.currency) / l.area
: null,
districtId:
l.address.latitude && l.address.longitude
? await this.resolveDistrictId(l.address.latitude, l.address.longitude)
: null,
floors_total: l.totalFloors,
has_elevator: l.elevator ?? false,
has_balcony: l.balcony ?? false,
is_furnished: l.furnished ?? false,
is_renovated: l.renovated ?? false,
},
];
}
private buildLocationDocument(l: FullListing) {
Iif (!l.address) return [];
return [
{ index: { _index: AUTOCOMPLETE_INDEX, _id: l.address.id.toString() } },
{
city: l.address.city,
country: l.address.country,
street: l.address.street,
},
];
}
private async resolveDistrictId(
latitude: number,
longitude: number,
): Promise<number | null> {
Iif (!this.geocoder || !this.regionsData) return null;
try {
const res = await this.geocoder.reverse({ lat: latitude, lon: longitude });
Iif (res && res.length > 0) {
const geocodedDistrictName = res[0].city; // Or another field like 'administrativeLevels.level2long'
Iif (!geocodedDistrictName) return null;
// Find the district in our regions data
for (const region of this.regionsData) {
for (const district of region.districts) {
// Check against different name variations
Iif (
district.name_en.toLowerCase() === geocodedDistrictName.toLowerCase() ||
district.name_ru.toLowerCase() === geocodedDistrictName.toLowerCase() ||
district.name_uz.toLowerCase() === geocodedDistrictName.toLowerCase()
) {
return district.id;
}
}
}
}
} catch (error) {
this.logger.error(
`Failed to resolve district for coords ${latitude},${longitude}`,
error,
);
}
return null;
}
private convertToBaseCurrency(price: number, currency: string): number {
// Basic currency conversion, assuming USD as base
// In a real app, use a proper currency conversion library/service
const rates: Record<string, number> = {
USD: 1,
EUR: 1.1,
UZS: 0.00008,
};
return price * (rates[currency] ?? 1);
}
private async bulkIndex(index: string, body: any[]) {
Iif (body.length === 0) return;
for (let i = 0; i < body.length; i += BULK_CHUNK_SIZE * 2) {
const chunk = body.slice(i, i + BULK_CHUNK_SIZE * 2);
await this.es.bulk({ refresh: true, body: chunk });
}
}
async mapSearch(filter: SearchFilterInput): Promise<SearchResult[]> {
const filterClauses = this.buildFilterClauses(filter);
Iif (
filter.northEastLat &&
filter.northEastLng &&
filter.southWestLat &&
filter.southWestLng
) {
filterClauses.push({
geo_bounding_box: {
location: {
top_left: { lat: filter.northEastLat, lon: filter.southWestLng },
bottom_right: {
lat: filter.southWestLat,
lon: filter.northEastLng,
},
},
},
});
}
const res = await this.es.search({
index: LISTINGS_INDEX,
from: 0,
size: 1000, // Return more results for map view
query: { bool: { filter: filterClauses } },
});
return this.mapResults(res);
}
async autocomplete(prefix: string) {
if (!prefix) return [];
const res = await this.es.search({
index: AUTOCOMPLETE_INDEX,
query: {
multi_match: {
query: prefix,
type: "bool_prefix",
fields: ["city", "country", "street"],
},
},
});
const suggestions = new Set<string>();
res.hits.hits.forEach((hit: any) => {
suggestions.add(hit._source.city);
suggestions.add(hit._source.country);
});
return Array.from(suggestions);
}
async suggest(query: string) {
if (!query) return [];
const res = await this.es.search({
index: LISTINGS_INDEX,
query: {
multi_match: {
query,
type: "bool_prefix",
fields: ["title", "title._2gram", "title._3gram"],
},
},
});
const results = this.mapResults(res);
return results.map((r) => r.title);
}
getFilterManifest(): FilterManifestResponse {
const filters: FilterDefinition[] = [
{ key: 'price', label: 'Price', type: 'range' },
{ key: 'area', label: 'Area', type: 'range' },
{
key: 'rooms',
label: 'Rooms',
type: 'terms',
options: [
{ label: '1', value: '1' },
{ label: '2', value: '2' },
{ label: '3', value: '3' },
{ label: '4', value: '4' },
{ label: '5+', value: '5' },
],
},
{
key: 'type',
label: 'Property Type',
type: 'terms',
options: [
{ label: 'Apartment', value: 'APARTMENT' },
{ label: 'House', value: 'HOUSE' },
{ label: 'Land', value: 'LAND' },
{ label: 'Commercial', value: 'COMMERCIAL' },
],
},
{
key: 'transactionType',
label: 'Transaction',
type: 'terms',
options: [
{ label: 'Sale', value: 'SALE' },
{ label: 'Rent', value: 'RENT' },
],
},
{
key: 'postedBy',
label: 'Posted By',
type: 'terms',
options: [
{ label: 'Private', value: 'private' },
{ label: 'Agent', value: 'agent' },
{ label: 'Developer', value: 'developer' },
],
},
{
key: 'createdWithin',
label: 'Created Within',
type: 'terms',
options: [
{ label: '24 hours', value: '24h' },
{ label: '3 days', value: '3d' },
{ label: '7 days', value: '7d' },
{ label: '30 days', value: '30d' },
],
},
{ key: 'hasPhotos', label: 'Has Photos', type: 'boolean' },
{ key: 'isVerified', label: 'Verified', type: 'boolean' },
{ key: 'is_furnished', label: 'Furnished', type: 'boolean' },
{ key: 'is_renovated', label: 'Renovated', type: 'boolean' },
{ key: 'has_elevator', label: 'Elevator', type: 'boolean' },
{ key: 'has_balcony', label: 'Balcony', type: 'boolean' },
{ key: 'floor', label: 'Floor', type: 'range' },
{ key: 'totalFloors', label: 'Total Floors', type: 'range' },
];
return { filters };
}
private buildFilterClauses(filter: SearchFilterInput): any[] {
const filterClauses: any[] = [];
Iif (filter.type) filterClauses.push({ term: { type: filter.type } });
Iif (filter.transactionType)
filterClauses.push({ term: { transactionType: filter.transactionType } });
Iif (filter.priceMin != null || filter.priceMax != null) {
filterClauses.push({
range: { price: { gte: filter.priceMin, lte: filter.priceMax } },
});
}
Iif (filter.areaMin != null || filter.areaMax != null) {
filterClauses.push({
range: { area: { gte: filter.areaMin, lte: filter.areaMax } },
});
}
Iif (filter.rooms && filter.rooms.length > 0) {
filterClauses.push({ terms: { rooms: filter.rooms } });
}
Iif (filter.hasPhotos !== undefined) {
filterClauses.push({ term: { hasPhotos: filter.hasPhotos } });
}
Iif (filter.postedBy && filter.postedBy.length > 0) {
filterClauses.push({ terms: { postedBy: filter.postedBy } });
}
Iif (filter.agencyId) {
filterClauses.push({ term: { agencyId: filter.agencyId } });
}
// Boolean amenity and status filters
Iif (filter.isVerified !== undefined) {
filterClauses.push({ term: { isVerified: filter.isVerified } });
}
Iif (filter.is_furnished !== undefined) {
filterClauses.push({ term: { is_furnished: filter.is_furnished } });
}
Iif (filter.is_renovated !== undefined) {
filterClauses.push({ term: { is_renovated: filter.is_renovated } });
}
Iif (filter.has_elevator !== undefined) {
filterClauses.push({ term: { has_elevator: filter.has_elevator } });
}
Iif (filter.has_balcony !== undefined) {
filterClauses.push({ term: { has_balcony: filter.has_balcony } });
}
// Floor range filters
Iif (filter.floorMin != null || filter.floorMax != null) {
filterClauses.push({
range: { floor: { gte: filter.floorMin, lte: filter.floorMax } },
});
}
Iif (filter.totalFloorsMin != null || filter.totalFloorsMax != null) {
filterClauses.push({
range: {
floors_total: {
gte: filter.totalFloorsMin,
lte: filter.totalFloorsMax,
},
},
});
}
Iif (filter.createdWithin) {
const now = Date.now();
const ranges: Record<string, number> = {
"24h": 24 * 60 * 60 * 1000,
"3d": 3 * 24 * 60 * 60 * 1000,
"7d": 7 * 24 * 60 * 60 * 1000,
"30d": 30 * 24 * 60 * 60 * 1000,
};
const ms = ranges[filter.createdWithin];
Iif (ms) {
filterClauses.push({
range: { createdAt: { gte: new Date(now - ms).toISOString() } },
});
}
}
Iif (filter.latitude && filter.longitude && filter.radius) {
filterClauses.push({
geo_distance: {
distance: `${filter.radius}km`,
location: { lat: filter.latitude, lon: filter.longitude },
},
});
}
return filterClauses;
}
private buildSort(sortBy?: string): any[] {
const sort: any[] = [];
switch (sortBy) {
case 'priceAsc':
sort.push({ price_base: 'asc' });
break;
case 'priceDesc':
sort.push({ price_base: 'desc' });
break;
case 'areaAsc':
sort.push({ area: 'asc' });
break;
case 'areaDesc':
sort.push({ area: 'desc' });
break;
case 'newest':
sort.push({ createdAt: 'desc' });
break;
default: // recommended
sort.push({ _score: 'desc' });
break;
}
// Add a tie-breaker for consistent sorting, which is required for search_after
sort.push({ id: 'asc' });
return sort;
}
async search(filter: SearchFilterInput): Promise<SearchServiceResponse> {
const must: any[] = [];
const filterClauses: any[] = this.buildFilterClauses(filter);
if (filter.text) {
must.push({
multi_match: {
query: filter.text,
fields: ["title", "description"],
fuzziness: "AUTO",
},
});
}
const esQuery = {
function_score: {
query: {
bool: {
must: must.length > 0 ? must : { match_all: {} },
filter: filterClauses,
},
},
functions: [
{
field_value_factor: {
field: 'boostWeight',
factor: 1,
modifier: 'none',
missing: 1,
},
},
{
gauss: {
createdAt: {
origin: 'now',
scale: '30d',
offset: '7d',
decay: 0.5,
},
},
weight: 2,
},
{
filter: { term: { hasPhotos: true } },
weight: 1.5,
},
{
filter: { term: { isVerified: true } },
weight: 2,
},
],
score_mode: 'sum',
boost_mode: 'multiply',
},
};
const sort = this.buildSort(filter.sortBy);
const aggs = filter.includeFacets ? this.buildAggregations() : undefined;
const searchRequest: any = {
index: LISTINGS_INDEX,
size: filter.size ?? 20,
query: esQuery,
sort,
aggs,
};
if (filter.searchAfter && filter.searchAfter.length > 0) {
searchRequest.search_after = filter.searchAfter;
} else {
searchRequest.from = filter.from ?? 0;
}
const res = await this.es.search(searchRequest);
const resultIds = this.mapResultIds(res);
const facets = filter.includeFacets
? this.mapAggregations(res.aggregations)
: undefined;
const lastHit = res.hits.hits[res.hits.hits.length - 1];
const searchAfter = lastHit ? lastHit.sort : undefined;
return { resultIds, facets, searchAfter };
}
private buildAggregations() {
return {
// Facets for keyword fields
type: { terms: { field: 'type', size: 10 } },
transactionType: { terms: { field: 'transactionType', size: 10 } },
rooms: { terms: { field: 'rooms', size: 10 } },
postedBy: { terms: { field: 'postedBy', size: 10 } },
// Facets for boolean fields
hasPhotos: { terms: { field: 'hasPhotos' } },
isVerified: { terms: { field: 'isVerified' } },
is_furnished: { terms: { field: 'is_furnished' } },
is_renovated: { terms: { field: 'is_renovated' } },
has_elevator: { terms: { field: 'has_elevator' } },
has_balcony: { terms: { field: 'has_balcony' } },
// Facets for range fields
price: {
range: {
field: 'price_base',
ranges: [
{ key: '<50k', to: 50000 },
{ key: '50k-100k', from: 50000, to: 100000 },
{ key: '100k-200k', from: 100000, to: 200000 },
{ key: '>200k', from: 200000 },
],
},
},
area: {
range: {
field: 'area',
ranges: [
{ key: '<50', to: 50 },
{ key: '50-100', from: 50, to: 100 },
{ key: '100-150', from: 100, to: 150 },
{ key: '>150', from: 150 },
],
},
},
};
}
private mapAggregations(aggregations: any): Record<string, any> | undefined {
if (!aggregations) return undefined;
const facets: Record<string, any> = {};
for (const key in aggregations) {
facets[key] = aggregations[key].buckets.map((b: any) => ({
key: b.key.toString(),
count: b.doc_count,
}));
}
return facets;
}
private mapResultIds(res: SearchResponse): string[] {
return res.hits.hits.map((hit) => hit._id).filter((id): id is string => !!id);
}
private mapResults(res: SearchResponse): SearchResult[] {
return res.hits.hits.map((hit: any) => ({
...hit._source,
id: hit._source.id,
title: hit._source.title,
score: hit._score,
price: hit._source.price,
currency: hit._source.currency,
location: hit._source.location,
sort: hit.sort,
}));
}
async saveSearch(user: { id: number }, saveSearchDto: SaveSearchDto) {
// Normalize raw filters into SearchFilters row and link via filtersId
const created = await this.prisma.client.savedSearch.create({
data: {
name: saveSearchDto.name,
userId: user.id,
filters: {
create: (saveSearchDto.filters as any) ?? {},
} as any,
},
include: { filters: true },
} as any);
return created;
}
async getSavedSearches(user: { id: number }) {
return this.prisma.client.savedSearch.findMany({
where: { userId: user.id },
});
}
async deleteSavedSearch(user: { id: number }, searchId: number) {
const search = await this.prisma.client.savedSearch.findUnique({
where: { id: searchId },
});
if (!search || search.userId !== user.id) {
throw new NotFoundException(
`Saved search with ID ${searchId} not found.`,
);
}
return this.prisma.client.savedSearch.delete({ where: { id: searchId } });
}
async updateSavedSearch(user: { id: number }, id: number, body: { name?: string; cadence?: string; channel?: string }) {
const search = await this.prisma.client.savedSearch.findUnique({ where: { id } });
Iif (!search || search.userId !== user.id) throw new NotFoundException('Saved search not found');
return this.prisma.client.savedSearch.update({ where: { id }, data: { name: body.name, cadence: body.cadence, channel: body.channel } as any });
}
async toggleSavedSearch(user: { id: number }, id: number) {
const search = await this.prisma.client.savedSearch.findUnique({ where: { id } });
Iif (!search || search.userId !== user.id) throw new NotFoundException('Saved search not found');
// @ts-ignore enabled exists
return this.prisma.client.savedSearch.update({ where: { id }, data: { enabled: !(search as any).enabled } });
}
async testSavedSearch(user: { id: number }, id: number) {
const search = await this.prisma.client.savedSearch.findUnique({ where: { id } });
Iif (!search || search.userId !== user.id) throw new NotFoundException('Saved search not found');
// TODO: enqueue a test notification to NotificationService
return { sent: true };
}
// Index single listing by ID (called by BullMQ worker)
async indexListing(listingId: number) {
const listing = await this.prisma.client.listing.findUnique({
where: { id: listingId },
include: {
address: true,
user: { include: { agency: true } },
photos: true,
boosts: { where: { active: true } },
openHouses: true,
},
} as any);
Iif (!listing) {
this.logger.warn(`Listing ${listingId} not found, skip index.`);
return;
}
const listingDoc = await this.buildListingDocument(listing as any);
const locationDoc = this.buildLocationDocument(listing as any);
const body = [...listingDoc, ...locationDoc];
Iif (body.length === 0) return;
await this.es.bulk({ refresh: true, body });
this.logger.log(`Indexed listing ${listingId}`);
}
// Public helper for OpenHouseService to patch nextOpenHouseDate without full re-index
async patchNextOpenHouse(listingId: number, date: Date | null) {
try {
await this.es.update({
index: LISTINGS_INDEX,
id: listingId.toString(),
doc: { nextOpenHouseDate: date },
doc_as_upsert: true,
});
} catch (err) {
this.logger.debug(
`ES patch failed for listing ${listingId}: ${(err as Error).message}`,
);
}
}
}
|