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import type { NextApiRequest, NextApiResponse } from 'next';
import console from '@/helpers/console';
import allowCors from '../../helpers/cors';
import { CACHE, fetchWithTimeout } from '@/helpers/http';
import { isValidCityName } from '../../helpers/city';
interface WeatherData {
city: string;
name?: string | null;
precipitation?: string | null;
humidity?: string | null;
windSpeed?: string | null;
grades?: string | null;
imageUrl?: string;
}
type WeatherResponse = WeatherData[] | { error: string };
type GeocodingResponse = {
results?: Array<{ latitude: number; longitude: number; name: string; country?: string }>;
};
type ForecastResponse = {
current?: {
temperature_2m: number;
relative_humidity_2m: number;
precipitation: number;
wind_speed_10m: number;
weather_code: number;
};
};
// Minimal WMO weather-code → description map, used as the image alt / name.
const WEATHER_CODE_TEXT: 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',
61: 'Slight rain',
63: 'Moderate rain',
65: 'Heavy rain',
71: 'Slight snow',
73: 'Moderate snow',
75: 'Heavy snow',
80: 'Slight rain showers',
81: 'Moderate rain showers',
82: 'Violent rain showers',
95: 'Thunderstorm',
96: 'Thunderstorm with slight hail',
99: 'Thunderstorm with heavy hail',
};
// WMO weather-code → local icon under public/weather/ (SDD-001: no remote image hosts involved).
const WEATHER_CODE_ICON: Record<number, string> = {
0: 'sun',
1: 'sun',
2: 'partly-cloudy',
3: 'cloud',
45: 'fog',
48: 'fog',
51: 'drizzle',
53: 'drizzle',
55: 'drizzle',
61: 'rain',
63: 'rain',
65: 'rain',
71: 'snow',
73: 'snow',
75: 'snow',
80: 'showers',
81: 'showers',
82: 'showers',
95: 'storm',
96: 'storm',
99: 'storm',
};
const emptyWeather = (city: string): WeatherData => ({
city,
name: null,
precipitation: null,
humidity: null,
windSpeed: null,
grades: null,
imageUrl: undefined,
});
/**
* @description Get current weather for a city from Open-Meteo (free, no API key).
* City names arrive as "limerick+ireland"; the first token is used to geocode,
* then the resulting coordinates feed the forecast endpoint.
*/
const getWeatherData = async (city: string): Promise<WeatherData> => {
const query = city.split('+')[0].trim();
const geoUrl = new URL('https://geocoding-api.open-meteo.com/v1/search');
geoUrl.searchParams.set('name', query);
geoUrl.searchParams.set('count', '1');
geoUrl.searchParams.set('language', 'en');
geoUrl.searchParams.set('format', 'json');
const geoRes = await fetchWithTimeout(geoUrl.toString());
Iif (!geoRes.ok) {
throw new Error(`Geocoding HTTP error! status: ${geoRes.status}`);
}
const geo = (await geoRes.json()) as GeocodingResponse;
const place = geo?.results?.[0];
Iif (!place) {
console.warn(`No geocoding result for city: ${city}`);
return emptyWeather(city);
}
const forecastUrl = new URL('https://api.open-meteo.com/v1/forecast');
forecastUrl.searchParams.set('latitude', String(place.latitude));
forecastUrl.searchParams.set('longitude', String(place.longitude));
forecastUrl.searchParams.set(
'current',
'temperature_2m,relative_humidity_2m,precipitation,wind_speed_10m,weather_code'
);
const forecastRes = await fetchWithTimeout(forecastUrl.toString());
Iif (!forecastRes.ok) {
throw new Error(`Forecast HTTP error! status: ${forecastRes.status}`);
}
const forecast = (await forecastRes.json()) as ForecastResponse;
const current = forecast?.current;
Iif (!current) {
console.warn(`No forecast data for city: ${city}`);
return emptyWeather(city);
}
return {
city,
name: WEATHER_CODE_TEXT[current.weather_code] ?? null,
grades: `${Math.round(current.temperature_2m)}`,
precipitation: `${current.precipitation} mm`,
humidity: `${current.relative_humidity_2m}%`,
windSpeed: `${Math.round(current.wind_speed_10m)} km/h`,
imageUrl: WEATHER_CODE_ICON[current.weather_code]
? `/weather/${WEATHER_CODE_ICON[current.weather_code]}.svg`
: undefined,
};
};
/**
* @description Get weather data from Open-Meteo
* @param req {NextApiRequest}
* @param res {NextApiResponse}
* @returns Promise<void>
* @example http://localhost:3000/api/weather?cities=Madrid,Barcelona
*/
export default allowCors(async function handler(req: NextApiRequest, res: NextApiResponse<WeatherResponse>) {
// Only allow GET requests
Iif (req.method !== 'GET') {
return res.status(405).json({ error: 'Method not allowed' });
}
const { query } = req;
const { cities = '' } = query;
// Validate cities parameter
Iif (!cities || typeof cities !== 'string') {
return res.status(400).json({ error: 'Cities parameter must be a non-empty string' });
}
// Validate cities format and length
const citiesArray = String(cities)
.split(',')
.map((city) => city.trim())
.filter(Boolean);
Iif (citiesArray.length === 0) {
return res.status(400).json({ error: 'At least one city must be provided' });
}
Iif (citiesArray.length > 5) {
return res.status(400).json({ error: 'Maximum 5 cities allowed' });
}
const invalidCities = citiesArray.filter((city) => !isValidCityName(city));
Iif (invalidCities.length > 0) {
return res.status(400).json({ error: `Invalid city names: ${invalidCities.join(', ')}` });
}
try {
await Promise.allSettled(citiesArray.map((city) => getWeatherData(city)))
.then((raw) => {
const results = raw
.filter((r): r is PromiseFulfilledResult<WeatherData> => r.status === 'fulfilled')
.map((result) => result.value);
res.setHeader('Cache-Control', CACHE.weather);
res.status(200).json(results);
})
.catch((err) => res.status(500).json({ error: err.message }));
} catch (err: unknown) {
Iif (err instanceof Error) {
res.status(500).json({ error: err.message });
}
}
});
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