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Andras Schmelczer 2026-02-07 22:19:44 +00:00
parent e5d5819098
commit 2906b01734
25 changed files with 1070 additions and 237 deletions
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57
frontend/src/lib/format.ts
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@ -15,48 +15,6 @@ export function formatValue(value: number, fmt?: ValueFormat): string {
return `${p}${value.toFixed(1)}${s}`;
}
/** Lookup table for feature-specific formatting */
export const FEATURE_FORMATS: Record<string, ValueFormat> = {
// Property
'Last known price': { prefix: '£' },
'Price per sqm': { prefix: '£' },
'Total floor area (sqm)': { suffix: ' sqm' },
'Number of bedrooms & living rooms': { suffix: ' rooms' },
'Transaction year': { raw: true },
'Construction age': { raw: true },
// Transport
'Public transport to Bank (mins)': { suffix: ' mins' },
'Public transport to Fitzrovia (mins)': { suffix: ' mins' },
'Cycling to Bank (mins)': { suffix: ' mins' },
'Cycling to Fitzrovia (mins)': { suffix: ' mins' },
// Crime
'Anti-social behaviour (avg/yr)': { suffix: '/yr' },
'Violence and sexual offences (avg/yr)': { suffix: '/yr' },
'Criminal damage and arson (avg/yr)': { suffix: '/yr' },
'Burglary (avg/yr)': { suffix: '/yr' },
'Vehicle crime (avg/yr)': { suffix: '/yr' },
'Robbery (avg/yr)': { suffix: '/yr' },
'Other theft (avg/yr)': { suffix: '/yr' },
'Shoplifting (avg/yr)': { suffix: '/yr' },
'Drugs (avg/yr)': { suffix: '/yr' },
'Possession of weapons (avg/yr)': { suffix: '/yr' },
'Public order (avg/yr)': { suffix: '/yr' },
'Bicycle theft (avg/yr)': { suffix: '/yr' },
'Theft from the person (avg/yr)': { suffix: '/yr' },
'Other crime (avg/yr)': { suffix: '/yr' },
'Serious crime (avg/yr)': { suffix: '/yr' },
'Minor crime (avg/yr)': { suffix: '/yr' },
// Demographics
'% White': { suffix: '%' },
'% Asian': { suffix: '%' },
'% Black': { suffix: '%' },
'% Mixed': { suffix: '%' },
'% Other': { suffix: '%' },
// Environment
'Noise (dB)': { suffix: ' dB' },
'Max available download speed (Mbps)': { suffix: ' Mbps', raw: true },
};
export function formatFilterValue(value: number): string {
if (Math.abs(value) >= 1_000_000) return `${(value / 1_000_000).toFixed(1)}M`;
if (Math.abs(value) >= 1_000) return `${(value / 1_000).toFixed(1)}k`;
@ -81,6 +39,21 @@ export function formatNumber(value: number | undefined, decimals = 0): string {
return decimals > 0 ? value.toFixed(decimals) : Math.round(value).toLocaleString();
}
export function formatRelativeTime(isoDate: string): string {
const now = Date.now();
const then = new Date(isoDate).getTime();
const diffMs = now - then;
const diffSec = Math.floor(diffMs / 1000);
if (diffSec < 60) return 'just now';
const diffMin = Math.floor(diffSec / 60);
if (diffMin < 60) return `${diffMin}m ago`;
const diffHr = Math.floor(diffMin / 60);
if (diffHr < 24) return `${diffHr}h ago`;
const diffDay = Math.floor(diffHr / 24);
if (diffDay < 30) return `${diffDay}d ago`;
return new Date(isoDate).toLocaleDateString();
}
// Calculate weighted mean from histogram with outlier bins.
// Bin 0 = [min, p1), bins 1..n-2 = [p1, p99) evenly, bin n-1 = [p99, max].
export function calculateHistogramMean(histogram: {