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Andras Schmelczer 2026-02-02 21:56:35 +00:00
parent 2c613dc0d1
commit a677b9331f
28 changed files with 1647 additions and 1498 deletions
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136
frontend/src/lib/external-search.ts Normal file
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import type { FeatureFilters } from '../types';
export interface HexagonLocation {
lat: number;
lon: number;
postcode: string | null;
resolution: number;
}
const PROPERTY_TYPE_MAP: Record<
string,
{ rightmove: string; onthemarket: string; zoopla: string }
> = {
House: { rightmove: 'detached,semi-detached,terraced', onthemarket: 'property', zoopla: '' },
Detached: { rightmove: 'detached', onthemarket: 'detached', zoopla: 'detached' },
'Semi-Detached': {
rightmove: 'semi-detached',
onthemarket: 'semi-detached',
zoopla: 'semi_detached',
},
'Mid-Terrace': { rightmove: 'terraced', onthemarket: 'terraced', zoopla: 'terraced' },
'End-Terrace': { rightmove: 'terraced', onthemarket: 'terraced', zoopla: 'terraced' },
'Enclosed Mid-Terrace': { rightmove: 'terraced', onthemarket: 'terraced', zoopla: 'terraced' },
'Enclosed End-Terrace': { rightmove: 'terraced', onthemarket: 'terraced', zoopla: 'terraced' },
Flat: { rightmove: 'flat', onthemarket: 'flats', zoopla: 'flat' },
Maisonette: { rightmove: 'flat', onthemarket: 'flats', zoopla: 'flat' },
Bungalow: { rightmove: 'bungalow', onthemarket: 'bungalow', zoopla: 'bungalow' },
'Park home': { rightmove: 'park-home', onthemarket: 'property', zoopla: '' },
};
export const H3_RADIUS_MILES: Record<number, number> = {
4: 15,
5: 6,
6: 3,
7: 1,
8: 0.5,
9: 0.25,
10: 0.25,
11: 0.25,
12: 0.25,
};
const RIGHTMOVE_RADII = [0.25, 0.5, 1, 3, 5, 10, 15, 20, 30, 40];
const OTM_RADII = [0.25, 0.5, 1, 3, 5, 10, 15, 20, 30, 40];
const ZOOPLA_RADII = [0.25, 0.5, 1, 3, 5, 10, 15, 20, 25, 30];
function nearestRadius(target: number, allowed: number[]): number {
return allowed.reduce((best, r) => (Math.abs(r - target) < Math.abs(best - target) ? r : best));
}
export function buildPropertySearchUrls(
location: HexagonLocation,
filters: FeatureFilters
): { rightmove: string; onthemarket: string; zoopla: string } {
const { lat, lon, postcode, resolution } = location;
const radiusMiles = H3_RADIUS_MILES[resolution] ?? 1;
const coordStr = `${lat.toFixed(5)},${lon.toFixed(5)}`;
const priceFilter = filters['Last known price'];
const minPrice =
Array.isArray(priceFilter) && typeof priceFilter[0] === 'number' ? priceFilter[0] : undefined;
const maxPrice =
Array.isArray(priceFilter) && typeof priceFilter[1] === 'number' ? priceFilter[1] : undefined;
const propertyTypes = filters['Property type'];
const selectedTypes =
Array.isArray(propertyTypes) && typeof propertyTypes[0] === 'string'
? (propertyTypes as string[])
: [];
const rmParams = new URLSearchParams();
rmParams.set('searchLocation', postcode || coordStr);
rmParams.set('channel', 'BUY');
rmParams.set('radius', String(nearestRadius(radiusMiles, RIGHTMOVE_RADII)));
if (minPrice !== undefined) rmParams.set('minPrice', String(Math.round(minPrice)));
if (maxPrice !== undefined) rmParams.set('maxPrice', String(Math.round(maxPrice)));
if (selectedTypes.length > 0) {
const rmTypes = [
...new Set(
selectedTypes.flatMap((t) => {
const mapped = PROPERTY_TYPE_MAP[t]?.rightmove;
return mapped ? mapped.split(',') : [];
})
),
];
if (rmTypes.length > 0) rmParams.set('propertyTypes', rmTypes.join(','));
}
const rightmove = `https://www.rightmove.co.uk/property-for-sale/find.html?${rmParams.toString()}`;
let otmType = 'property';
if (selectedTypes.length > 0) {
const otmTypes = [
...new Set(selectedTypes.map((t) => PROPERTY_TYPE_MAP[t]?.onthemarket).filter(Boolean)),
];
if (otmTypes.length === 1 && otmTypes[0] !== 'property') otmType = otmTypes[0]!;
}
const otmParams = new URLSearchParams();
otmParams.set('radius', String(nearestRadius(radiusMiles, OTM_RADII)));
if (minPrice !== undefined) otmParams.set('min-price', String(Math.round(minPrice)));
if (maxPrice !== undefined) otmParams.set('max-price', String(Math.round(maxPrice)));
let onthemarket: string;
if (postcode) {
const slug = postcode.replace(/\s+/g, '-').toLowerCase();
onthemarket = `https://www.onthemarket.com/for-sale/${otmType}/${slug}/?${otmParams.toString()}`;
} else {
otmParams.set('search-site', 'geo');
otmParams.set('geo-lat', String(lat));
otmParams.set('geo-lng', String(lon));
onthemarket = `https://www.onthemarket.com/for-sale/${otmType}/?${otmParams.toString()}`;
}
const zParams = new URLSearchParams();
zParams.set('q', postcode || coordStr);
zParams.set('search_source', 'for-sale');
zParams.set('radius', String(nearestRadius(radiusMiles, ZOOPLA_RADII)));
if (minPrice !== undefined) zParams.set('price_min', String(Math.round(minPrice)));
if (maxPrice !== undefined) zParams.set('price_max', String(Math.round(maxPrice)));
if (selectedTypes.length > 0) {
const zTypes = [
...new Set(selectedTypes.map((t) => PROPERTY_TYPE_MAP[t]?.zoopla).filter(Boolean)),
];
for (const zt of zTypes) {
zParams.append('property_sub_type', zt!);
}
}
let zoopla: string;
if (postcode) {
const slug = postcode.replace(/\s+/g, '-').toLowerCase();
zoopla = `https://www.zoopla.co.uk/for-sale/property/${slug}/?${zParams.toString()}`;
} else {
zParams.set('geo_autocomplete_identifier', `geo_${lat}_${lon}`);
zoopla = `https://www.zoopla.co.uk/for-sale/property/?${zParams.toString()}`;
}
return { rightmove, onthemarket, zoopla };
}