rss-tools/sources/weather/weather.go (view raw)
| 1 | package weather |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "html" |
| 9 | "math" |
| 10 | "net/http" |
| 11 | "net/url" |
| 12 | "strconv" |
| 13 | "strings" |
| 14 | "time" |
| 15 | |
| 16 | "olexsmir.xyz/rss-tools/app" |
| 17 | ) |
| 18 | |
| 19 | const ( |
| 20 | forecastAPIURL = "https://api.open-meteo.com/v1/forecast" |
| 21 | airQualityAPIURL = "https://air-quality-api.open-meteo.com/v1/air-quality" |
| 22 | geocodingAPIURL = "https://nominatim.openstreetmap.org/reverse" |
| 23 | |
| 24 | clockLayout = "15:04" |
| 25 | localLayout = "2006-01-02T15:04" |
| 26 | ) |
| 27 | |
| 28 | var timelineHours = []int{8, 12, 16, 20} |
| 29 | |
| 30 | type weather struct { |
| 31 | client *http.Client |
| 32 | forecastURL string |
| 33 | airQualityURL string |
| 34 | geocodingURL string |
| 35 | } |
| 36 | |
| 37 | func Register(a *app.App) error { |
| 38 | w := &weather{ |
| 39 | client: a.Client, |
| 40 | forecastURL: forecastAPIURL, |
| 41 | airQualityURL: airQualityAPIURL, |
| 42 | geocodingURL: geocodingAPIURL, |
| 43 | } |
| 44 | a.Route("GET /weather", w.handler) |
| 45 | a.Logger.Info("weather source registered") |
| 46 | return nil |
| 47 | } |
| 48 | |
| 49 | func (w *weather) handler(rw http.ResponseWriter, r *http.Request) { |
| 50 | lat, lon, err := parseCoordinates(r) |
| 51 | if err != nil { |
| 52 | http.Error(rw, "invalid latitude/longitude", http.StatusBadRequest) |
| 53 | return |
| 54 | } |
| 55 | |
| 56 | forecast, err := w.fetchForecast(r.Context(), lat, lon) |
| 57 | if err != nil { |
| 58 | http.Error(rw, "failed to fetch weather forecast", http.StatusBadGateway) |
| 59 | return |
| 60 | } |
| 61 | |
| 62 | air, err := w.fetchAirQuality(r.Context(), lat, lon) |
| 63 | if err != nil { |
| 64 | http.Error(rw, "failed to fetch air quality", http.StatusBadGateway) |
| 65 | return |
| 66 | } |
| 67 | |
| 68 | content, updated, err := buildMorningBriefing(forecast, air) |
| 69 | if err != nil { |
| 70 | http.Error(rw, "failed to build weather briefing", http.StatusBadGateway) |
| 71 | return |
| 72 | } |
| 73 | |
| 74 | place := fmt.Sprintf("%.4f,%.4f", lat, lon) |
| 75 | if town, err := w.fetchTownName(r.Context(), lat, lon); err == nil && town != "" { |
| 76 | place = town |
| 77 | } |
| 78 | |
| 79 | feedID := weatherFeedID(lat, lon) |
| 80 | feed := app.NewFeed(fmt.Sprintf("Weather forecast for %s", place), feedID). |
| 81 | WithUpdated(updated) |
| 82 | |
| 83 | feed.Add(app.FeedEntry{ |
| 84 | Title: "Morning weather briefing", |
| 85 | ID: fmt.Sprintf("%s-%s", feedID, updated.Format("20060102")), |
| 86 | Content: formatBriefingHTML(content), |
| 87 | ContentType: "html", |
| 88 | Updated: updated, |
| 89 | }) |
| 90 | |
| 91 | if err := feed.Render(rw); err != nil { |
| 92 | http.Error(rw, "failed to render feed", http.StatusInternalServerError) |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | func parseCoordinates(r *http.Request) (float64, float64, error) { |
| 97 | latRaw := strings.TrimSpace(r.URL.Query().Get("latitude")) |
| 98 | lonRaw := strings.TrimSpace(r.URL.Query().Get("longitude")) |
| 99 | if latRaw == "" || lonRaw == "" { |
| 100 | return 0, 0, errors.New("latitude and longitude are required") |
| 101 | } |
| 102 | |
| 103 | lat, err := strconv.ParseFloat(latRaw, 64) |
| 104 | if err != nil { |
| 105 | return 0, 0, fmt.Errorf("invalid latitude: %w", err) |
| 106 | } |
| 107 | lon, err := strconv.ParseFloat(lonRaw, 64) |
| 108 | if err != nil { |
| 109 | return 0, 0, fmt.Errorf("invalid longitude: %w", err) |
| 110 | } |
| 111 | |
| 112 | if lat < -90 || lat > 90 { |
| 113 | return 0, 0, errors.New("latitude is out of range") |
| 114 | } |
| 115 | if lon < -180 || lon > 180 { |
| 116 | return 0, 0, errors.New("longitude is out of range") |
| 117 | } |
| 118 | return lat, lon, nil |
| 119 | } |
| 120 | |
| 121 | type forecastResponse struct { |
| 122 | Timezone string `json:"timezone"` |
| 123 | Current struct { |
| 124 | Time string `json:"time"` |
| 125 | Temperature2M *float64 `json:"temperature_2m"` |
| 126 | ApparentTemperature *float64 `json:"apparent_temperature"` |
| 127 | } `json:"current"` |
| 128 | Daily struct { |
| 129 | Time []string `json:"time"` |
| 130 | TemperatureMin []float64 `json:"temperature_2m_min"` |
| 131 | TemperatureMax []float64 `json:"temperature_2m_max"` |
| 132 | WeatherCode []int `json:"weather_code"` |
| 133 | PrecipitationProbability []float64 `json:"precipitation_probability_max"` |
| 134 | PrecipitationSum []float64 `json:"precipitation_sum"` |
| 135 | RainSum []float64 `json:"rain_sum"` |
| 136 | ShowersSum []float64 `json:"showers_sum"` |
| 137 | WindSpeedMax []float64 `json:"wind_speed_10m_max"` |
| 138 | WindDirectionDominant []float64 `json:"wind_direction_10m_dominant"` |
| 139 | } `json:"daily"` |
| 140 | Hourly struct { |
| 141 | Time []string `json:"time"` |
| 142 | Temperature []float64 `json:"temperature_2m"` |
| 143 | WeatherCode []int `json:"weather_code"` |
| 144 | PrecipitationProbability []float64 `json:"precipitation_probability"` |
| 145 | WindSpeed []float64 `json:"wind_speed_10m"` |
| 146 | Humidity []float64 `json:"relative_humidity_2m"` |
| 147 | } `json:"hourly"` |
| 148 | } |
| 149 | |
| 150 | type airQualityResponse struct { |
| 151 | Current struct { |
| 152 | USAQI *float64 `json:"us_aqi"` |
| 153 | PM2_5 *float64 `json:"pm2_5"` |
| 154 | PM10 *float64 `json:"pm10"` |
| 155 | Ozone *float64 `json:"ozone"` |
| 156 | NitrogenDioxide *float64 `json:"nitrogen_dioxide"` |
| 157 | } `json:"current"` |
| 158 | } |
| 159 | |
| 160 | type geocodingResponse struct { |
| 161 | Name string `json:"name"` |
| 162 | DisplayName string `json:"display_name"` |
| 163 | Address struct { |
| 164 | City string `json:"city"` |
| 165 | Town string `json:"town"` |
| 166 | Village string `json:"village"` |
| 167 | Municipality string `json:"municipality"` |
| 168 | Hamlet string `json:"hamlet"` |
| 169 | County string `json:"county"` |
| 170 | } `json:"address"` |
| 171 | } |
| 172 | |
| 173 | func (w *weather) fetchForecast(ctx context.Context, lat, lon float64) (forecastResponse, error) { |
| 174 | var payload forecastResponse |
| 175 | |
| 176 | q := url.Values{} |
| 177 | q.Set("latitude", strconv.FormatFloat(lat, 'f', 6, 64)) |
| 178 | q.Set("longitude", strconv.FormatFloat(lon, 'f', 6, 64)) |
| 179 | q.Set("timezone", "auto") |
| 180 | q.Set("forecast_days", "1") |
| 181 | q.Set("current", strings.Join([]string{ |
| 182 | "temperature_2m", |
| 183 | "apparent_temperature", |
| 184 | }, ",")) |
| 185 | q.Set("daily", strings.Join([]string{ |
| 186 | "temperature_2m_min", |
| 187 | "temperature_2m_max", |
| 188 | "weather_code", |
| 189 | "precipitation_probability_max", |
| 190 | "precipitation_sum", |
| 191 | "rain_sum", |
| 192 | "showers_sum", |
| 193 | "wind_speed_10m_max", |
| 194 | "wind_direction_10m_dominant", |
| 195 | }, ",")) |
| 196 | q.Set("hourly", strings.Join([]string{ |
| 197 | "temperature_2m", |
| 198 | "weather_code", |
| 199 | "precipitation_probability", |
| 200 | "wind_speed_10m", |
| 201 | "relative_humidity_2m", |
| 202 | }, ",")) |
| 203 | |
| 204 | endpoint := w.forecastURL + "?" + q.Encode() |
| 205 | req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil) |
| 206 | if err != nil { |
| 207 | return payload, err |
| 208 | } |
| 209 | |
| 210 | res, err := w.client.Do(req) |
| 211 | if err != nil { |
| 212 | return payload, err |
| 213 | } |
| 214 | defer res.Body.Close() |
| 215 | |
| 216 | if res.StatusCode != http.StatusOK { |
| 217 | return payload, fmt.Errorf("forecast API returned %s", res.Status) |
| 218 | } |
| 219 | if err := json.NewDecoder(res.Body).Decode(&payload); err != nil { |
| 220 | return payload, err |
| 221 | } |
| 222 | if len(payload.Daily.Time) == 0 || len(payload.Daily.TemperatureMin) == 0 || len(payload.Daily.TemperatureMax) == 0 { |
| 223 | return payload, errors.New("forecast payload missing daily data") |
| 224 | } |
| 225 | if len(payload.Hourly.Time) == 0 || len(payload.Hourly.Temperature) == 0 { |
| 226 | return payload, errors.New("forecast payload missing hourly data") |
| 227 | } |
| 228 | return payload, nil |
| 229 | } |
| 230 | |
| 231 | func (w *weather) fetchAirQuality(ctx context.Context, lat, lon float64) (airQualityResponse, error) { |
| 232 | var payload airQualityResponse |
| 233 | |
| 234 | q := url.Values{} |
| 235 | q.Set("latitude", strconv.FormatFloat(lat, 'f', 6, 64)) |
| 236 | q.Set("longitude", strconv.FormatFloat(lon, 'f', 6, 64)) |
| 237 | q.Set("timezone", "auto") |
| 238 | q.Set("current", strings.Join([]string{ |
| 239 | "us_aqi", |
| 240 | "pm2_5", |
| 241 | "pm10", |
| 242 | "ozone", |
| 243 | "nitrogen_dioxide", |
| 244 | }, ",")) |
| 245 | |
| 246 | endpoint := w.airQualityURL + "?" + q.Encode() |
| 247 | req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil) |
| 248 | if err != nil { |
| 249 | return payload, err |
| 250 | } |
| 251 | |
| 252 | res, err := w.client.Do(req) |
| 253 | if err != nil { |
| 254 | return payload, err |
| 255 | } |
| 256 | defer res.Body.Close() |
| 257 | |
| 258 | if res.StatusCode != http.StatusOK { |
| 259 | return payload, fmt.Errorf("air quality API returned %s", res.Status) |
| 260 | } |
| 261 | if err := json.NewDecoder(res.Body).Decode(&payload); err != nil { |
| 262 | return payload, err |
| 263 | } |
| 264 | return payload, nil |
| 265 | } |
| 266 | |
| 267 | func (w *weather) fetchTownName(ctx context.Context, lat, lon float64) (string, error) { |
| 268 | var payload geocodingResponse |
| 269 | |
| 270 | geocodingURL := w.geocodingURL |
| 271 | if geocodingURL == "" { |
| 272 | geocodingURL = geocodingAPIURL |
| 273 | } |
| 274 | |
| 275 | q := url.Values{} |
| 276 | q.Set("lat", strconv.FormatFloat(lat, 'f', 6, 64)) |
| 277 | q.Set("lon", strconv.FormatFloat(lon, 'f', 6, 64)) |
| 278 | q.Set("format", "jsonv2") |
| 279 | q.Set("accept-language", "en") |
| 280 | q.Set("zoom", "12") |
| 281 | q.Set("addressdetails", "1") |
| 282 | |
| 283 | endpoint := geocodingURL + "?" + q.Encode() |
| 284 | req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil) |
| 285 | if err != nil { |
| 286 | return "", err |
| 287 | } |
| 288 | req.Header.Set("User-Agent", "rss-tools/1.0 (+https://github.com/olexsmir/rss-tools)") |
| 289 | |
| 290 | res, err := w.client.Do(req) |
| 291 | if err != nil { |
| 292 | return "", err |
| 293 | } |
| 294 | defer res.Body.Close() |
| 295 | |
| 296 | if res.StatusCode != http.StatusOK { |
| 297 | return "", fmt.Errorf("geocoding API returned %s", res.Status) |
| 298 | } |
| 299 | if err := json.NewDecoder(res.Body).Decode(&payload); err != nil { |
| 300 | return "", err |
| 301 | } |
| 302 | |
| 303 | for _, candidate := range []string{ |
| 304 | payload.Address.City, |
| 305 | payload.Address.Town, |
| 306 | payload.Address.Village, |
| 307 | payload.Address.Municipality, |
| 308 | payload.Address.Hamlet, |
| 309 | payload.Address.County, |
| 310 | payload.Name, |
| 311 | firstDisplayNamePart(payload.DisplayName), |
| 312 | } { |
| 313 | if town := strings.TrimSpace(candidate); town != "" { |
| 314 | return town, nil |
| 315 | } |
| 316 | } |
| 317 | return "", errors.New("town name not found") |
| 318 | } |
| 319 | |
| 320 | func firstDisplayNamePart(displayName string) string { |
| 321 | part, _, _ := strings.Cut(displayName, ",") |
| 322 | return strings.TrimSpace(part) |
| 323 | } |
| 324 | |
| 325 | func formatBriefingHTML(content string) string { |
| 326 | return "<pre>" + html.EscapeString(content) + "</pre>" |
| 327 | } |
| 328 | |
| 329 | func buildMorningBriefing(forecast forecastResponse, air airQualityResponse) (string, time.Time, error) { |
| 330 | loc := time.Local |
| 331 | if tz := strings.TrimSpace(forecast.Timezone); tz != "" { |
| 332 | zone, err := time.LoadLocation(tz) |
| 333 | if err == nil { |
| 334 | loc = zone |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | day := firstEl(forecast.Daily.Time) |
| 339 | if day == "" { |
| 340 | return "", time.Time{}, errors.New("missing day") |
| 341 | } |
| 342 | |
| 343 | updated := time.Now().In(loc) |
| 344 | if parsed, err := time.ParseInLocation(localLayout, forecast.Current.Time, loc); err == nil { |
| 345 | updated = parsed |
| 346 | } |
| 347 | |
| 348 | minTemp := firstEl(forecast.Daily.TemperatureMin) |
| 349 | maxTemp := firstEl(forecast.Daily.TemperatureMax) |
| 350 | code := firstEl(forecast.Daily.WeatherCode) |
| 351 | _, dayText := weatherCodeLabel(code) |
| 352 | |
| 353 | peakPrecipHour := peakPrecipitationHour(forecast, day, loc) |
| 354 | if maxProbability := firstEl(forecast.Daily.PrecipitationProbability); maxProbability >= 50 { |
| 355 | switch { |
| 356 | case peakPrecipHour >= 12 && peakPrecipHour <= 18: |
| 357 | dayText += " with showers in the afternoon" |
| 358 | case peakPrecipHour >= 5 && peakPrecipHour < 12: |
| 359 | dayText += " with rain in the morning" |
| 360 | default: |
| 361 | dayText += " with possible rain" |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | rainLine := fmt.Sprintf( |
| 366 | "ā %d%% chance of rain (%s)", |
| 367 | int(math.Round(firstEl(forecast.Daily.PrecipitationProbability))), |
| 368 | rainAmount(forecast.Daily.PrecipitationSum, forecast.Daily.RainSum, forecast.Daily.ShowersSum), |
| 369 | ) |
| 370 | |
| 371 | windMin, windMax := minMaxForDay(forecast.Hourly.Time, forecast.Hourly.WindSpeed, day) |
| 372 | if windMin == 0 && windMax == 0 { |
| 373 | windMax = firstEl(forecast.Daily.WindSpeedMax) |
| 374 | windMin = windMax |
| 375 | } |
| 376 | windDirection := windDirectionFromDegrees(firstEl(forecast.Daily.WindDirectionDominant)) |
| 377 | windLine := formatWindLine(windMin, windMax, windDirection) |
| 378 | |
| 379 | lowTemp, lowTime, highTemp, highTime, ok := dayExtremes(forecast.Hourly.Time, forecast.Hourly.Temperature, day, loc) |
| 380 | extremesLine := "" |
| 381 | if ok { |
| 382 | extremesLine = fmt.Sprintf( |
| 383 | "š High: %s at %s ā¢ š Low: %s at %s", |
| 384 | formatSignedTemperature(highTemp), |
| 385 | highTime.Format(clockLayout), |
| 386 | formatSignedTemperature(lowTemp), |
| 387 | lowTime.Format(clockLayout), |
| 388 | ) |
| 389 | } |
| 390 | |
| 391 | nowLine := "" |
| 392 | if forecast.Current.Temperature2M != nil && forecast.Current.ApparentTemperature != nil { |
| 393 | nowLine = fmt.Sprintf( |
| 394 | "š” Now: %s (feels like %s)", |
| 395 | formatSignedTemperature(*forecast.Current.Temperature2M), |
| 396 | formatSignedTemperature(*forecast.Current.ApparentTemperature), |
| 397 | ) |
| 398 | } |
| 399 | |
| 400 | humidityMin, humidityMax := minMaxForDay(forecast.Hourly.Time, forecast.Hourly.Humidity, day) |
| 401 | humidityLine := "" |
| 402 | if humidityMin != 0 || humidityMax != 0 { |
| 403 | humidityLine = fmt.Sprintf("š§ Humidity: %d-%d%%", int(math.Round(humidityMin)), int(math.Round(humidityMax))) |
| 404 | } |
| 405 | |
| 406 | airLine := formatAirQualityLine(air) |
| 407 | timelineLines := timelineSummary(forecast, day, loc) |
| 408 | if len(timelineLines) == 0 { |
| 409 | return "", time.Time{}, errors.New("missing timeline data") |
| 410 | } |
| 411 | |
| 412 | lines := []string{ |
| 413 | fmt.Sprintf("%s / %s | %s", formatSignedTemperature(minTemp), formatSignedTemperature(maxTemp), dayText), |
| 414 | rainLine, |
| 415 | windLine, |
| 416 | } |
| 417 | if extremesLine != "" { |
| 418 | lines = append(lines, extremesLine) |
| 419 | } |
| 420 | if nowLine != "" { |
| 421 | lines = append(lines, nowLine) |
| 422 | } |
| 423 | if humidityLine != "" { |
| 424 | lines = append(lines, humidityLine) |
| 425 | } |
| 426 | if airLine != "" { |
| 427 | lines = append(lines, airLine) |
| 428 | } |
| 429 | lines = append(lines, "") |
| 430 | lines = append(lines, timelineLines...) |
| 431 | lines = append(lines, "", "Data: Open-Meteo") |
| 432 | |
| 433 | return strings.Join(lines, "\n"), updated, nil |
| 434 | } |
| 435 | |
| 436 | func peakPrecipitationHour(forecast forecastResponse, day string, loc *time.Location) int { |
| 437 | peakHour := -1 |
| 438 | maxProb := -1.0 |
| 439 | for i, raw := range forecast.Hourly.Time { |
| 440 | if i >= len(forecast.Hourly.PrecipitationProbability) || !strings.HasPrefix(raw, day+"T") { |
| 441 | continue |
| 442 | } |
| 443 | t, err := time.ParseInLocation(localLayout, raw, loc) |
| 444 | if err != nil { |
| 445 | continue |
| 446 | } |
| 447 | prob := forecast.Hourly.PrecipitationProbability[i] |
| 448 | if prob > maxProb { |
| 449 | maxProb = prob |
| 450 | peakHour = t.Hour() |
| 451 | } |
| 452 | } |
| 453 | return peakHour |
| 454 | } |
| 455 | |
| 456 | func dayExtremes(times []string, values []float64, day string, loc *time.Location) (float64, time.Time, float64, time.Time, bool) { |
| 457 | if len(times) == 0 || len(values) == 0 { |
| 458 | return 0, time.Time{}, 0, time.Time{}, false |
| 459 | } |
| 460 | minVal, maxVal := 0.0, 0.0 |
| 461 | var minTime, maxTime time.Time |
| 462 | found := false |
| 463 | for i, raw := range times { |
| 464 | if i >= len(values) || !strings.HasPrefix(raw, day+"T") { |
| 465 | continue |
| 466 | } |
| 467 | t, err := time.ParseInLocation(localLayout, raw, loc) |
| 468 | if err != nil { |
| 469 | continue |
| 470 | } |
| 471 | v := values[i] |
| 472 | if !found { |
| 473 | minVal, maxVal = v, v |
| 474 | minTime, maxTime = t, t |
| 475 | found = true |
| 476 | continue |
| 477 | } |
| 478 | if v < minVal { |
| 479 | minVal = v |
| 480 | minTime = t |
| 481 | } |
| 482 | if v > maxVal { |
| 483 | maxVal = v |
| 484 | maxTime = t |
| 485 | } |
| 486 | } |
| 487 | return minVal, minTime, maxVal, maxTime, found |
| 488 | } |
| 489 | |
| 490 | func minMaxForDay(times []string, values []float64, day string) (float64, float64) { |
| 491 | if len(times) == 0 || len(values) == 0 { |
| 492 | return 0, 0 |
| 493 | } |
| 494 | minV, maxV := 0.0, 0.0 |
| 495 | found := false |
| 496 | for i, raw := range times { |
| 497 | if i >= len(values) || !strings.HasPrefix(raw, day+"T") { |
| 498 | continue |
| 499 | } |
| 500 | v := values[i] |
| 501 | if !found { |
| 502 | minV, maxV = v, v |
| 503 | found = true |
| 504 | continue |
| 505 | } |
| 506 | if v < minV { |
| 507 | minV = v |
| 508 | } |
| 509 | if v > maxV { |
| 510 | maxV = v |
| 511 | } |
| 512 | } |
| 513 | if !found { |
| 514 | return 0, 0 |
| 515 | } |
| 516 | return minV, maxV |
| 517 | } |
| 518 | |
| 519 | func timelineSummary(forecast forecastResponse, day string, loc *time.Location) []string { |
| 520 | out := make([]string, 0, len(timelineHours)) |
| 521 | |
| 522 | type point struct { |
| 523 | time time.Time |
| 524 | temp float64 |
| 525 | code int |
| 526 | valid bool |
| 527 | } |
| 528 | |
| 529 | points := make([]point, 0, len(forecast.Hourly.Time)) |
| 530 | for i, raw := range forecast.Hourly.Time { |
| 531 | if i >= len(forecast.Hourly.Temperature) || !strings.HasPrefix(raw, day+"T") { |
| 532 | continue |
| 533 | } |
| 534 | t, err := time.ParseInLocation(localLayout, raw, loc) |
| 535 | if err != nil { |
| 536 | continue |
| 537 | } |
| 538 | code := 0 |
| 539 | if i < len(forecast.Hourly.WeatherCode) { |
| 540 | code = forecast.Hourly.WeatherCode[i] |
| 541 | } |
| 542 | points = append(points, point{ |
| 543 | time: t, |
| 544 | temp: forecast.Hourly.Temperature[i], |
| 545 | code: code, |
| 546 | valid: true, |
| 547 | }) |
| 548 | } |
| 549 | if len(points) == 0 { |
| 550 | return nil |
| 551 | } |
| 552 | |
| 553 | for _, targetHour := range timelineHours { |
| 554 | bestIdx := -1 |
| 555 | bestDelta := 24 |
| 556 | for i, p := range points { |
| 557 | delta := p.time.Hour() - targetHour |
| 558 | if delta < 0 { |
| 559 | delta = -delta |
| 560 | } |
| 561 | if delta < bestDelta { |
| 562 | bestDelta = delta |
| 563 | bestIdx = i |
| 564 | } |
| 565 | } |
| 566 | if bestIdx < 0 { |
| 567 | continue |
| 568 | } |
| 569 | icon, text := weatherCodeLabel(points[bestIdx].code) |
| 570 | out = append(out, fmt.Sprintf("%02d:00 %s %s %s", targetHour, formatSignedTemperature(points[bestIdx].temp), icon, text)) |
| 571 | } |
| 572 | return out |
| 573 | } |
| 574 | |
| 575 | func weatherCodeLabel(code int) (string, string) { |
| 576 | switch code { |
| 577 | case 0: |
| 578 | return "ā", "Clear sky" |
| 579 | case 1: |
| 580 | return "ā ", "Mostly clear" |
| 581 | case 2: |
| 582 | return "š„", "Partly cloudy" |
| 583 | case 3: |
| 584 | return "ā", "Cloudy" |
| 585 | case 45, 48: |
| 586 | return "š«", "Fog" |
| 587 | case 51, 53, 55, 56, 57: |
| 588 | return "š¦", "Drizzle" |
| 589 | case 61, 63, 65, 66, 67: |
| 590 | return "š§", "Rain" |
| 591 | case 71, 73, 75, 77: |
| 592 | return "šØ", "Snow" |
| 593 | case 80, 81, 82: |
| 594 | return "š§", "Rain showers" |
| 595 | case 85, 86: |
| 596 | return "šØ", "Snow showers" |
| 597 | case 95, 96, 99: |
| 598 | return "ā", "Thunderstorm" |
| 599 | default: |
| 600 | return "š¤", "Variable clouds" |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | func windDirectionFromDegrees(degrees float64) string { |
| 605 | directions := []string{ |
| 606 | "N", "NNE", "NE", "ENE", |
| 607 | "E", "ESE", "SE", "SSE", |
| 608 | "S", "SSW", "SW", "WSW", |
| 609 | "W", "WNW", "NW", "NNW", |
| 610 | } |
| 611 | normalized := math.Mod(degrees, 360) |
| 612 | if normalized < 0 { |
| 613 | normalized += 360 |
| 614 | } |
| 615 | idx := int(math.Round(normalized/22.5)) % len(directions) |
| 616 | return directions[idx] |
| 617 | } |
| 618 | |
| 619 | func rainAmount(precipitationSum, rainSum, showersSum []float64) string { |
| 620 | precip := firstEl(precipitationSum) |
| 621 | rain := firstEl(rainSum) |
| 622 | showers := firstEl(showersSum) |
| 623 | |
| 624 | low := rain |
| 625 | if low <= 0 { |
| 626 | low = precip |
| 627 | } |
| 628 | high := precip |
| 629 | if showers > 0 && rain > 0 { |
| 630 | high = math.Max(high, rain+showers) |
| 631 | } |
| 632 | if high < low { |
| 633 | high = low |
| 634 | } |
| 635 | if high <= 0 { |
| 636 | return "0 mm" |
| 637 | } |
| 638 | |
| 639 | lowMM := int(math.Round(low)) |
| 640 | highMM := int(math.Round(high)) |
| 641 | if lowMM == highMM { |
| 642 | return fmt.Sprintf("%d mm", highMM) |
| 643 | } |
| 644 | return fmt.Sprintf("%d-%d mm", lowMM, highMM) |
| 645 | } |
| 646 | |
| 647 | func formatAirQualityLine(air airQualityResponse) string { |
| 648 | if air.Current.USAQI == nil && air.Current.PM2_5 == nil && air.Current.PM10 == nil { |
| 649 | return "" |
| 650 | } |
| 651 | |
| 652 | parts := make([]string, 0, 4) |
| 653 | if air.Current.USAQI != nil { |
| 654 | aqi := int(math.Round(*air.Current.USAQI)) |
| 655 | parts = append(parts, fmt.Sprintf("AQI %d (%s)", aqi, usAQILevel(aqi))) |
| 656 | } |
| 657 | if air.Current.PM2_5 != nil { |
| 658 | parts = append(parts, fmt.Sprintf("PM2.5 %.1f", *air.Current.PM2_5)) |
| 659 | } |
| 660 | if air.Current.PM10 != nil { |
| 661 | parts = append(parts, fmt.Sprintf("PM10 %.1f", *air.Current.PM10)) |
| 662 | } |
| 663 | if air.Current.Ozone != nil { |
| 664 | parts = append(parts, fmt.Sprintf("O3 %.1f", *air.Current.Ozone)) |
| 665 | } |
| 666 | if air.Current.NitrogenDioxide != nil { |
| 667 | parts = append(parts, fmt.Sprintf("NO2 %.1f", *air.Current.NitrogenDioxide)) |
| 668 | } |
| 669 | return "š« Air: " + strings.Join(parts, ", ") |
| 670 | } |
| 671 | |
| 672 | func usAQILevel(v int) string { |
| 673 | switch { |
| 674 | case v <= 50: |
| 675 | return "Good" |
| 676 | case v <= 100: |
| 677 | return "Moderate" |
| 678 | case v <= 150: |
| 679 | return "Unhealthy for sensitive groups" |
| 680 | case v <= 200: |
| 681 | return "Unhealthy" |
| 682 | case v <= 300: |
| 683 | return "Very unhealthy" |
| 684 | default: |
| 685 | return "Hazardous" |
| 686 | } |
| 687 | } |
| 688 | |
| 689 | func weatherFeedID(lat, lon float64) string { |
| 690 | return fmt.Sprintf("weather-lat-%s-lon-%s", normalizeCoord(lat), normalizeCoord(lon)) |
| 691 | } |
| 692 | |
| 693 | func normalizeCoord(v float64) string { |
| 694 | s := strconv.FormatFloat(v, 'f', 4, 64) |
| 695 | s = strings.ReplaceAll(s, "-", "m") |
| 696 | return strings.ReplaceAll(s, ".", "_") |
| 697 | } |
| 698 | |
| 699 | func formatSignedTemperature(v float64) string { |
| 700 | n := int(math.Round(v)) |
| 701 | if n > 0 { |
| 702 | return fmt.Sprintf("+%dĀ°", n) |
| 703 | } |
| 704 | return fmt.Sprintf("%dĀ°", n) |
| 705 | } |
| 706 | |
| 707 | func formatWindLine(minWind, maxWind float64, direction string) string { |
| 708 | minV := int(math.Round(minWind)) |
| 709 | maxV := int(math.Round(maxWind)) |
| 710 | if maxV < minV { |
| 711 | minV, maxV = maxV, minV |
| 712 | } |
| 713 | if minV == maxV { |
| 714 | return fmt.Sprintf("š¬ Wind: %d km/h from %s", minV, direction) |
| 715 | } |
| 716 | return fmt.Sprintf("š¬ Wind: %d-%d km/h from %s", minV, maxV, direction) |
| 717 | } |
| 718 | |
| 719 | func firstEl[T comparable](values []T) T { |
| 720 | if len(values) == 0 { |
| 721 | var zero T |
| 722 | return zero |
| 723 | } |
| 724 | return values[0] |
| 725 | } |