/** Format number with Finnish decimal comma: 2.3 → "2,3" */
export function formatNum(value: number): string {
return String(value).replace('.', ',');
}
/** Format number with fixed decimals and Finnish comma: (1.5, 1) → "1,5" */
export function formatFixed(value: number, decimals: number): string {
return value.toFixed(decimals).replace('.', ',');
}
/** Convert 12h time string to 24h: "08:06 AM" → "08:06", "01:30 PM" → "13:30" */
export function to24h(time: string): string {
const match = time.trim().match(/^(\d{1,2}):(\d{2})\s*(AM|PM)$/i);
if (!match) return time;
let hours = parseInt(match[1], 10);
const minutes = match[2];
const period = match[3].toUpperCase();
if (period === 'AM' && hours === 12) hours = 0;
else if (period === 'PM' && hours !== 12) hours += 12;
return `${String(hours).padStart(2, '0')}:${minutes}`;
}
export function knotsToMs(knots: number): number {
return Math.round(knots * 0.5144 * 10) / 10;
}
export function kmhToMs(kmh: number): number {
return Math.round((kmh / 3.6) * 10) / 10;
}
export function mphToMs(mph: number): number {
return Math.round(mph * 0.4470 * 10) / 10;
}
export function inHgToHpa(inHg: number): number {
return Math.round(inHg * 33.8639 * 10) / 10;
}
export function fToC(f: number): number {
return Math.round(((f - 32) * 5) / 9 * 10) / 10;
}
export function milesToKm(miles: number): number {
return Math.round(miles * 1.60934 * 10) / 10;
}
export function degreesToCardinal(deg: number): string {
const directions = ['N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'WSW', 'W', 'WNW', 'NW', 'NNW'];
const index = Math.round(deg / 22.5) % 16;
return directions[index];
}
// WMO Weather interpretation codes (WW)
const wmoDescriptions: Record<number, string> = {
0: 'Clear sky',
1: 'Mainly clear',
2: 'Partly cloudy',
3: 'Overcast',
45: 'Fog',
48: 'Depositing rime fog',
51: 'Light drizzle',
53: 'Moderate drizzle',
55: 'Dense drizzle',
56: 'Light freezing drizzle',
57: 'Dense freezing drizzle',
61: 'Slight rain',
63: 'Moderate rain',
65: 'Heavy rain',
66: 'Light freezing rain',
67: 'Heavy freezing rain',
71: 'Slight snowfall',
73: 'Moderate snowfall',
75: 'Heavy snowfall',
77: 'Snow grains',
80: 'Slight rain showers',
81: 'Moderate rain showers',
82: 'Violent rain showers',
85: 'Slight snow showers',
86: 'Heavy snow showers',
95: 'Thunderstorm',
96: 'Thunderstorm with slight hail',
99: 'Thunderstorm with heavy hail',
};
export function wmoCodeToDescription(code: number): string {
return wmoDescriptions[code] ?? `Unknown (code ${code})`;
}
export function aqiToCategory(aqi: number): string {
if (aqi <= 50) return 'Good';
if (aqi <= 100) return 'Moderate';
if (aqi <= 150) return 'Unhealthy for Sensitive Groups';
if (aqi <= 200) return 'Unhealthy';
if (aqi <= 300) return 'Very Unhealthy';
return 'Hazardous';
}
