itd/infinitime/weather.go

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package infinitime
import (
"bytes"
"encoding/binary"
"errors"
"time"
)
const (
weatherVersion = 0
currentWeatherType = 0
forecastWeatherType = 1
)
type WeatherIcon uint8
const (
WeatherIconClear WeatherIcon = iota
WeatherIconFewClouds
WeatherIconClouds
WeatherIconHeavyClouds
WeatherIconCloudsWithRain
WeatherIconRain
WeatherIconThunderstorm
WeatherIconSnow
WeatherIconMist
)
// CurrentWeather represents the current weather
type CurrentWeather struct {
Time time.Time
CurrentTemp float32
MinTemp float32
MaxTemp float32
Location string
Icon WeatherIcon
}
// Bytes returns the [CurrentWeather] struct encoded using the InfiniTime
// weather wire protocol.
func (cw CurrentWeather) Bytes() []byte {
buf := &bytes.Buffer{}
buf.WriteByte(currentWeatherType)
buf.WriteByte(weatherVersion)
_, offset := cw.Time.Zone()
binary.Write(buf, binary.LittleEndian, cw.Time.Unix()+int64(offset))
binary.Write(buf, binary.LittleEndian, int16(cw.CurrentTemp*100))
binary.Write(buf, binary.LittleEndian, int16(cw.MinTemp*100))
binary.Write(buf, binary.LittleEndian, int16(cw.MaxTemp*100))
location := make([]byte, 32)
copy(location, cw.Location)
buf.Write(location)
buf.WriteByte(byte(cw.Icon))
return buf.Bytes()
}
// Forecast represents a weather forecast
type Forecast struct {
Time time.Time
Days []ForecastDay
}
// ForecastDay represents a forecast for a single day
type ForecastDay struct {
MinTemp int16
MaxTemp int16
Icon WeatherIcon
}
// Bytes returns the [Forecast] struct encoded using the InfiniTime
// weather wire protocol.
func (f Forecast) Bytes() []byte {
buf := &bytes.Buffer{}
buf.WriteByte(forecastWeatherType)
buf.WriteByte(weatherVersion)
_, offset := f.Time.Zone()
binary.Write(buf, binary.LittleEndian, f.Time.Unix()+int64(offset))
buf.WriteByte(uint8(len(f.Days)))
for _, day := range f.Days {
binary.Write(buf, binary.LittleEndian, day.MinTemp*100)
binary.Write(buf, binary.LittleEndian, day.MaxTemp*100)
buf.WriteByte(byte(day.Icon))
}
return buf.Bytes()
}
// SetCurrentWeather updates the current weather data on the PineTime
func (d *Device) SetCurrentWeather(cw CurrentWeather) error {
c, err := d.getChar(weatherDataChar)
if err != nil {
return err
}
_, err = c.WriteWithoutResponse(cw.Bytes())
return err
}
// SetForecast sets future forecast data on the PineTime
func (d *Device) SetForecast(f Forecast) error {
c, err := d.getChar(weatherDataChar)
if err != nil {
return err
}
if len(f.Days) > 5 {
return errors.New("amount of forecast days exceeds maximum of 5")
}
_, err = c.WriteWithoutResponse(f.Bytes())
return err
}