Satyam Rastogi
119 lines
4.8 KiB
JavaScript
119 lines
4.8 KiB
JavaScript
/**
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* Proxies Tomorrow.io daily weather forecast for the Plano TX area.
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* Set TOMORROW_API_KEY in Vercel env vars (and .env locally for vercel dev).
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*
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* Response: array of 7-day daily forecast objects, normalised for the frontend.
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* Cached 1 hour — free tier allows 500 calls/day.
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*/
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const PLANO_LAT = 33.055;
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const PLANO_LNG = -96.752;
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// Tomorrow.io weather code → label + hail risk flag
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function interpretCode(code) {
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const map = {
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1000: { label: 'Clear', hailRisk: false },
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1001: { label: 'Cloudy', hailRisk: false },
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1100: { label: 'Mostly Clear', hailRisk: false },
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1101: { label: 'Partly Cloudy', hailRisk: false },
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1102: { label: 'Mostly Cloudy', hailRisk: false },
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2000: { label: 'Fog', hailRisk: false },
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4000: { label: 'Drizzle', hailRisk: false },
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4001: { label: 'Rain', hailRisk: false },
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4200: { label: 'Light Rain', hailRisk: false },
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4201: { label: 'Heavy Rain', hailRisk: false },
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5000: { label: 'Snow', hailRisk: false },
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5001: { label: 'Flurries', hailRisk: false },
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5100: { label: 'Light Snow', hailRisk: false },
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5101: { label: 'Heavy Snow', hailRisk: false },
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6000: { label: 'Freezing Drizzle', hailRisk: true },
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6001: { label: 'Freezing Rain', hailRisk: true },
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6200: { label: 'Lt Freezing Rain', hailRisk: true },
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6201: { label: 'Hvy Freezing Rain',hailRisk: true },
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7000: { label: 'Ice Pellets', hailRisk: true },
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7101: { label: 'Heavy Hail', hailRisk: true },
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7102: { label: 'Light Hail', hailRisk: true },
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8000: { label: 'Thunderstorm', hailRisk: true },
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};
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return map[code] ?? { label: 'Mixed', hailRisk: false };
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}
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export default async function handler(req, res) {
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res.setHeader('Cache-Control', 's-maxage=3600, stale-while-revalidate=7200');
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res.setHeader('Access-Control-Allow-Origin', '*');
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if (req.method !== 'GET') {
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return res.status(405).json({ error: 'Method not allowed' });
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}
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// Trim to tolerate a stray trailing space/newline in the env var value.
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const key = (process.env.TOMORROW_API_KEY || '').trim();
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if (!key) {
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console.warn('[storm-forecast] TOMORROW_API_KEY not set');
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return res.status(200).json([]);
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}
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try {
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const fields = [
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'precipitationProbability',
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'weatherCode',
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'windSpeedAvg',
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'windGustMax',
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'temperatureAvg',
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'precipitationIntensityAvg',
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'humidityAvg',
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].join(',');
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const url = `https://api.tomorrow.io/v4/weather/forecast?location=${PLANO_LAT},${PLANO_LNG}&apikey=${key}×teps=1d&units=imperial&fields=${fields}`;
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const resp = await fetch(url, {
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headers: { Accept: 'application/json' },
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});
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if (!resp.ok) {
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const txt = await resp.text();
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console.warn('[storm-forecast] Tomorrow.io error', resp.status, txt);
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return res.status(200).json([]);
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}
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const data = await resp.json();
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const daily = data?.timelines?.daily ?? [];
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const forecast = daily.slice(0, 7).map(day => {
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const v = day.values ?? {};
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// Daily aggregated fields may come back as plain names or with Avg/Max suffix
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const precipProb = v.precipitationProbability ?? v.precipitationProbabilityAvg ?? 0;
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const weatherCode = v.weatherCode ?? v.weatherCodeMax ?? 1000;
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const windGust = v.windGustMax ?? v.windGustAvg ?? 0;
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const windSpeed = v.windSpeedAvg ?? 0;
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const temp = v.temperatureAvg ?? 0;
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const humidity = v.humidityAvg ?? 0;
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const { label, hailRisk } = interpretCode(weatherCode);
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// Storm severity: 0–100 score for how dangerous this day looks
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const stormScore = Math.min(100, Math.round(
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precipProb * 0.5 +
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(hailRisk ? 35 : 0) +
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(windGust > 40 ? 15 : windGust > 25 ? 8 : 0)
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));
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return {
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date: day.time,
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precipProb: Math.round(precipProb),
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weatherCode,
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weatherLabel: label,
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hailRisk,
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windGust: Math.round(windGust),
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windSpeed: Math.round(windSpeed),
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tempF: Math.round(temp),
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humidity: Math.round(humidity),
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stormScore,
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};
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});
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return res.status(200).json(forecast);
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} catch (err) {
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console.error('[storm-forecast] error:', err.message);
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return res.status(200).json([]);
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}
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}
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