/**
 * Shared formatting utility functions.
 *
 * Consolidates duplicated formatters that were previously defined inline in
 * PropertyCard, ListingDetail, MobileBottomSheet, and StatsBar.
 */

/** Format a number as a compact GBP string, e.g. "£1.2k" or "£950". */
export function formatCurrency(value: number): string {
    if (value >= 1000) return `£${(value / 1000).toFixed(1)}k`;
    return `£${Math.round(value)}`;
}

/** Format a duration in seconds as a human-readable string, e.g. "12m" or "1h30m". */
export function formatDuration(seconds: number): string {
    const minutes = Math.round(seconds / 60);
    if (minutes < 60) return `${minutes}m`;
    const hours = Math.floor(minutes / 60);
    const mins = minutes % 60;
    return mins > 0 ? `${hours}h${mins}m` : `${hours}h`;
}

/** Format an ISO date string as a localised short date (e.g. "3 Jan 2025"). */
export function formatDate(value: string): string {
    const date = new Date(value);
    if (isNaN(date.getTime())) return value;
    return date.toLocaleDateString('en-GB', { day: 'numeric', month: 'short', year: 'numeric' });
}

/**
 * Compute the price per square metre as a formatted string, e.g. "£4,500/m²".
 * Returns null when square metres data is unavailable.
 */
export function formatPricePerSqm(price: number, sqm: number | null | undefined): string | null {
    if (sqm == null || sqm <= 0) return null;
    return `£${Math.round(price / sqm).toLocaleString()}/m²`;
}