118 lines
2.1 KiB
Go
118 lines
2.1 KiB
Go
package tariff
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/evcc-io/evcc/api"
|
|
"golang.org/x/text/currency"
|
|
)
|
|
|
|
type Tariffs struct {
|
|
Currency currency.Unit
|
|
Grid, FeedIn, Co2, Planner, Solar, Temperature api.Tariff
|
|
}
|
|
|
|
// At returns the rate at the given time
|
|
func At(t api.Tariff, ts time.Time) (api.Rate, error) {
|
|
if t != nil {
|
|
if rr, err := t.Rates(); err == nil {
|
|
if r, err := rr.At(ts); err == nil {
|
|
return r, nil
|
|
}
|
|
}
|
|
}
|
|
return api.Rate{}, api.ErrNotAvailable
|
|
}
|
|
|
|
// Now returns the price/cost/value at the given time
|
|
func Now(t api.Tariff) (float64, error) {
|
|
r, err := At(t, time.Now())
|
|
return r.Value, err
|
|
}
|
|
|
|
// Rates returns the tariffs rates if not nil
|
|
func Rates(t api.Tariff) api.Rates {
|
|
if t == nil {
|
|
return nil
|
|
}
|
|
|
|
rr, err := t.Rates()
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
return rr
|
|
}
|
|
|
|
// AverageRate returns the arithmetic mean of rates in [now, now+d), or nil if unavailable.
|
|
func AverageRate(t api.Tariff, d time.Duration) *float64 {
|
|
rr := Rates(t)
|
|
if rr == nil {
|
|
return nil
|
|
}
|
|
|
|
now := time.Now()
|
|
end := now.Add(d)
|
|
|
|
var sum float64
|
|
var count int
|
|
for _, r := range rr {
|
|
if r.Start.Before(end) && r.End.After(now) {
|
|
sum += r.Value
|
|
count++
|
|
}
|
|
}
|
|
|
|
if count == 0 {
|
|
return nil
|
|
}
|
|
|
|
return new(sum / float64(count))
|
|
}
|
|
|
|
func (t *Tariffs) Get(u api.TariffUsage) api.Tariff {
|
|
// ensure tariff is not a wrapper
|
|
exists := func(t api.Tariff) bool {
|
|
return t != nil && t.Type() != 0
|
|
}
|
|
|
|
switch u {
|
|
case api.TariffUsageCo2:
|
|
return t.Co2
|
|
|
|
case api.TariffUsageFeedIn:
|
|
return t.FeedIn
|
|
|
|
case api.TariffUsageGrid:
|
|
return t.Grid
|
|
|
|
// TODO solar
|
|
case api.TariffUsagePlanner:
|
|
switch {
|
|
case exists(t.Planner):
|
|
// prio 0: manually set planner tariff
|
|
return t.Planner
|
|
|
|
case exists(t.Grid) && t.Grid.Type() == api.TariffTypePriceForecast:
|
|
// prio 1: grid tariff with forecast
|
|
return t.Grid
|
|
|
|
case exists(t.Co2):
|
|
// prio 2: co2 tariff
|
|
return t.Co2
|
|
|
|
default:
|
|
// prio 3: static grid tariff
|
|
return t.Grid
|
|
}
|
|
|
|
case api.TariffUsageSolar:
|
|
return t.Solar
|
|
|
|
case api.TariffUsageTemperature:
|
|
return t.Temperature
|
|
|
|
default:
|
|
return nil
|
|
}
|
|
}
|