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// Copyright © 2022 siddharth ravikumar <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package weather
import (
"fmt"
"strings"
"time"
"ricketyspace.net/peach/nws"
"ricketyspace.net/peach/photon"
t "ricketyspace.net/peach/time"
"ricketyspace.net/peach/version"
)
type Weather struct {
Title string
Version string
Location string
Now WeatherNow
Q2HTimeline WeatherTimeline // Q2H forecast of the next 12 hours.
BiDailyTimeline WeatherTimeline // BiDaily forecast for the next 3 days.
SearchEnabled bool
Alerts []Alert
}
type WeatherNow struct {
Temperature int
TemperatureUnit string
Forecast string
WindSpeed string
WindDirection string
Humidity int
}
type WeatherPeriod struct {
Name string
Forecast string
Hour int
Temperature int
TemperatureUnit string
}
type WeatherTimeline struct {
Periods []WeatherPeriod
}
type Alert struct {
Event string
Severity string
Description []string
Instruction []string
}
func NewWeather(lat, lng float32) (*Weather, error, int) {
fBundle, nwsErr := nws.GetForecastBundle(lat, lng)
if nwsErr != nil {
return nil, nwsErr, nwsErr.Status
}
// Get humidity from the grid data.
h, err := humidity(fBundle.ForecastGrid)
if err != nil {
return nil, err, 500
}
w := new(Weather)
w.Location = fmt.Sprintf("%s, %s",
strings.ToLower(fBundle.Point.Properties.RelativeLocation.Properties.City),
strings.ToLower(fBundle.Point.Properties.RelativeLocation.Properties.State),
)
w.Title = w.Location
w.Version = version.Version
w.Now = WeatherNow{
Temperature: fBundle.ForecastHourly.Properties.Periods[0].Temperature,
TemperatureUnit: fBundle.ForecastHourly.Properties.Periods[0].TemperatureUnit,
Forecast: fBundle.ForecastHourly.Properties.Periods[0].ShortForecast,
WindSpeed: fBundle.ForecastHourly.Properties.Periods[0].WindSpeed,
WindDirection: fBundle.ForecastHourly.Properties.Periods[0].WindDirection,
Humidity: h,
}
// Build Q2H timeline for the 12 hours.
q2hPeriods := []WeatherPeriod{}
max := 6
for i, period := range fBundle.ForecastHourly.Properties.Periods {
if i%2 != 0 {
continue // Take every other period
}
t, err := time.Parse(time.RFC3339, period.StartTime)
if err != nil {
return nil, err, 500
}
p := WeatherPeriod{
Forecast: period.DetailedForecast,
Hour: t.Hour(),
Temperature: period.Temperature,
TemperatureUnit: period.TemperatureUnit,
}
q2hPeriods = append(q2hPeriods, p)
if len(q2hPeriods) == max {
break
}
}
w.Q2HTimeline = WeatherTimeline{
Periods: q2hPeriods,
}
// Build BiDaily timeline for the next 3 days.
bdPeriods := []WeatherPeriod{}
max = 8
for _, period := range fBundle.Forecast.Properties.Periods {
p := WeatherPeriod{
Name: period.Name,
Forecast: period.DetailedForecast,
Temperature: period.Temperature,
TemperatureUnit: period.TemperatureUnit,
}
bdPeriods = append(bdPeriods, p)
if len(bdPeriods) == max {
break
}
}
w.BiDailyTimeline = WeatherTimeline{
Periods: bdPeriods,
}
w.SearchEnabled = photon.Enabled()
// Add alerts if they exist.
if len(fBundle.Alerts.Features) > 0 {
w.Alerts = make([]Alert, 0)
am := make(map[string]bool, 0) // Alerts map.
for _, f := range fBundle.Alerts.Features {
if _, ok := am[f.Id]; ok {
continue // Duplicate; skip.
}
a := Alert{
Event: f.Properties.Event,
Severity: f.Properties.Severity,
Description: strings.Split(f.Properties.Description, "\n\n"),
Instruction: strings.Split(f.Properties.Instruction, "\n\n"),
}
w.Alerts = append(w.Alerts, a)
am[f.Id] = true
}
}
return w, nil, 200
}
func humidity(g *nws.ForecastGrid) (int, error) {
if g == nil {
return 0, fmt.Errorf("humdity: forecast grid data empty")
}
for _, v := range g.Properties.RelativeHumidity.Values {
yes, err := t.IsCurrent(v.ValidTime)
if err != nil {
return 0, fmt.Errorf("humidity: %v", err)
}
if yes {
return v.Value, nil
}
}
return 0, fmt.Errorf("humidity: not found")
}
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