personal-website/src/lib/house-tracker/pararius.test.ts

import { readFileSync } from 'node:fs';
import { describe, expect, it } from 'vitest';
import {
	cityFromSlug,
	isChallenge,
	listingRef,
	parseDetailPage,
	parseEuros,
	parseLocation,
	parseSearchPage,
	searchPageUrl
} from './pararius';
import { listingDetailSchema, listingCardSchema } from './types';

const fixture = (name: string) =>
	readFileSync(new URL(`./fixtures/${name}`, import.meta.url), 'utf8');

describe('pararius helpers', () => {
	it('reads listing urls', () => {
		expect(listingRef('/appartement-te-huur/gouda/541493b8/graaf-hendrikstraat')).toEqual({
			sourceId: '541493b8',
			url: 'https://www.pararius.nl/appartement-te-huur/gouda/541493b8/graaf-hendrikstraat',
			offer: 'rent',
			propertyType: 'apartment',
			citySlug: 'gouda'
		});
		expect(listingRef('https://www.pararius.nl/huis-te-koop/den-haag/0a1b2c3d/laan')?.offer).toBe(
			'buy'
		);
		expect(listingRef('/huurwoningen/gouda')).toBeNull();
	});

	it('parses Dutch and English prices', () => {
		expect(parseEuros('€ 1.558 per maand')).toBe(1558);
		expect(parseEuros('€1,600 per month')).toBe(1600);
		expect(parseEuros('€ 425.000 k.k.')).toBe(425000);
		expect(parseEuros('€ 1.250,50')).toBe(1250);
		expect(parseEuros('Prijs op aanvraag')).toBeNull();
	});

	it('splits a location line', () => {
		expect(parseLocation('2801 BC Gouda (Centrum)')).toEqual({
			postalCode: '2801 BC',
			city: 'Gouda',
			neighbourhood: 'Centrum'
		});
		expect(parseLocation('Alphen aan den Rijn')).toEqual({
			postalCode: null,
			city: 'Alphen aan den Rijn',
			neighbourhood: null
		});
	});

	it('names cities from slugs', () => {
		expect(cityFromSlug('gouda')).toBe('Gouda');
		expect(cityFromSlug('den-haag')).toBe('Den Haag');
		expect(cityFromSlug('alphen-aan-den-rijn')).toBe('Alphen aan den Rijn');
	});

	it('builds page urls', () => {
		const base = 'https://www.pararius.nl/huurwoningen/gouda/1300-1700';
		expect(searchPageUrl(base, 1)).toBe(base);
		expect(searchPageUrl(base, 3)).toBe(`${base}/page-3`);
		expect(searchPageUrl(`${base}/page-3`, 2)).toBe(`${base}/page-2`);
	});

	it('detects Cloudflare challenges', () => {
		expect(isChallenge('<html><head><title>Just a moment...</title>')).toBe(true);
		expect(isChallenge('<html>ok</html>', 403)).toBe(true);
		expect(isChallenge(fixture('pararius-detail-house.html'))).toBe(false);
	});
});

describe('parseDetailPage', () => {
	it('reads a house listing', () => {
		const detail = parseDetailPage(fixture('pararius-detail-house.html'))!;
		expect(listingDetailSchema.parse(detail)).toBeTruthy();
		expect(detail).toMatchObject({
			sourceId: '8f976237',
			offer: 'rent',
			propertyType: 'house',
			externalId: '8f976237-2ce0-5613-adbe-883495268361',
			street: 'Kongsbergstraat 45',
			postalCode: '2804 XV',
			city: 'Gouda',
			neighbourhood: 'De Mammoet',
			priceEur: 1600,
			areaM2: 113,
			rooms: 5,
			bedrooms: 4,
			constructionYear: 1981,
			energyLabel: 'B',
			depositEur: 1600,
			agent: 'LIV Residential',
			offeredAt: '2026-09-30T09:47:00.000Z'
		});
		expect(detail.lat).toBeCloseTo(52.0284, 3);
		expect(detail.lng).toBeCloseTo(4.7174, 3);
	});

	it('reads interior and availability', () => {
		const detail = parseDetailPage(fixture('pararius-detail-apartment.html'))!;
		expect(detail).toMatchObject({
			propertyType: 'apartment',
			priceEur: 1558,
			interior: 'gestoffeerd',
			availableFrom: 'Per 15-10-2026',
			contractType: 'Onbepaalde tijd',
			depositEur: 3316,
			offeredAt: '2026-10-02T05:35:37.000Z'
		});
	});

	it('keeps price-on-request listings', () => {
		const detail = parseDetailPage(fixture('pararius-detail-on-request.html'))!;
		expect(detail.priceEur).toBeNull();
		expect(detail.interior).toBe('gemeubileerd');
		expect(listingDetailSchema.parse(detail)).toBeTruthy();
	});

	it('rejects pages that are not listings', () => {
		expect(parseDetailPage('<html><body>nothing</body></html>')).toBeNull();
	});
});

describe('parseSearchPage', () => {
	it('reads listing cards and pagination', () => {
		const page = parseSearchPage(
			fixture('pararius-search-synthetic.html'),
			'https://www.pararius.nl/huurwoningen/gouda'
		);
		expect(page.cards).toHaveLength(3);
		for (const card of page.cards) expect(listingCardSchema.parse(card)).toBeTruthy();
		expect(page.cards[0]).toMatchObject({
			sourceId: 'd5d8a72c',
			title: 'Appartement Raam',
			postalCode: '2801 VN',
			city: 'Gouda',
			neighbourhood: 'Binnenstad',
			priceEur: 1475,
			areaM2: 58,
			rooms: 3,
			interior: 'Gestoffeerd',
			agent: 'Voorbeeld Makelaardij'
		});
		expect(page.cards[1].priceEur).toBe(1600);
		expect(page.cards[2].priceEur).toBeNull();
		expect(page.nextPageUrl).toBe('https://www.pararius.nl/huurwoningen/gouda/page-2');
		expect(page.totalResults).toBe(12);
	});

	it('falls back to bare links when card markup changes', () => {
		const html = `<div><a href="/huis-te-huur/gouda/0a1b2c3d/straat">Huis Straat 1</a> € 1.400 per maand 80 m²</div>`;
		const page = parseSearchPage(html, 'https://www.pararius.nl/huurwoningen/gouda');
		expect(page.cards).toHaveLength(1);
		expect(page.cards[0]).toMatchObject({ sourceId: '0a1b2c3d', priceEur: 1400, areaM2: 80 });
	});
});