94 lines
4.0 KiB
Swift
94 lines
4.0 KiB
Swift
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// WeatherService.swift
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// Jarvis — weather via Open-Meteo (free, no API key, no entitlement). Used to put
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// a "will it rain today" line in the morning/evening briefing.
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import Foundation
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struct DailyWeather {
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let place: String
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let tempMax: Double
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let tempMin: Double
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let precipProbability: Int // %
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let code: Int // WMO weather code
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var willRain: Bool { precipProbability >= 40 }
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/// e.g. "Kampala 26°/18°, light rain · 70% — take an umbrella ☔️"
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var summary: String {
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let temps = "\(Int(tempMax.rounded()))°/\(Int(tempMin.rounded()))°"
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let cond = WeatherService.codeText(code)
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let rain = "\(precipProbability)% rain"
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let tail = willRain ? " — take an umbrella ☔️" : ""
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return "\(place) \(temps), \(cond) · \(rain)\(tail)"
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}
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}
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enum WeatherService {
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struct GeoResult: Decodable { let latitude: Double; let longitude: Double; let name: String; let country: String? }
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private struct GeoResponse: Decodable { let results: [GeoResult]? }
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private struct ForecastResponse: Decodable {
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struct Daily: Decodable {
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let temperature_2m_max: [Double]
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let temperature_2m_min: [Double]
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let precipitation_probability_max: [Int?]
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let weathercode: [Int]
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}
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let daily: Daily
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}
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private static let session = URLSession(configuration: .default)
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/// Geocode a free-text place to coordinates.
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static func geocode(_ query: String) async -> GeoResult? {
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let q = query.trimmingCharacters(in: .whitespaces)
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guard !q.isEmpty,
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var c = URLComponents(string: "https://geocoding-api.open-meteo.com/v1/search")
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else { return nil }
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c.queryItems = [.init(name: "name", value: q), .init(name: "count", value: "1"),
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.init(name: "language", value: "en"), .init(name: "format", value: "json")]
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guard let url = c.url else { return nil }
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do {
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let (data, _) = try await session.data(from: url)
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return try JSONDecoder().decode(GeoResponse.self, from: data).results?.first
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} catch { return nil }
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}
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/// Today's forecast for coordinates.
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static func forecast(latitude: Double, longitude: Double, place: String) async -> DailyWeather? {
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guard var c = URLComponents(string: "https://api.open-meteo.com/v1/forecast") else { return nil }
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c.queryItems = [
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.init(name: "latitude", value: "\(latitude)"),
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.init(name: "longitude", value: "\(longitude)"),
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.init(name: "daily", value: "temperature_2m_max,temperature_2m_min,precipitation_probability_max,weathercode"),
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.init(name: "timezone", value: "auto"),
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.init(name: "forecast_days", value: "1"),
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]
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guard let url = c.url else { return nil }
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do {
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let (data, _) = try await session.data(from: url)
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let r = try JSONDecoder().decode(ForecastResponse.self, from: data)
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guard let tmax = r.daily.temperature_2m_max.first,
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let tmin = r.daily.temperature_2m_min.first,
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let code = r.daily.weathercode.first else { return nil }
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let prob = r.daily.precipitation_probability_max.first.flatMap { $0 } ?? 0
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return DailyWeather(place: place, tempMax: tmax, tempMin: tmin, precipProbability: prob, code: code)
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} catch { return nil }
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}
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/// Coarse WMO weather-code → words.
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static func codeText(_ code: Int) -> String {
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switch code {
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case 0: return "clear"
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case 1, 2: return "partly cloudy"
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case 3: return "overcast"
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case 45, 48: return "fog"
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case 51, 53, 55, 56, 57: return "drizzle"
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case 61, 63, 65, 66, 67: return "rain"
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case 71, 73, 75, 77: return "snow"
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case 80, 81, 82: return "rain showers"
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case 95, 96, 99: return "thunderstorms"
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default: return "mixed"
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}
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}
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}
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