64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
package tariff
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import (
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"time"
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"github.com/evcc-io/evcc/api"
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)
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const SlotDuration = 15 * time.Minute
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type SlotWrapper struct {
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api.Tariff
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}
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// Rates converts arbitrary slot lengths (e.g. 1h, 30m) to 15m slots.
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// Slot length must be multiple of SlotDuration.
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// For price tariffs, the value is constant over all sub-slots.
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// For solar/co2, linear interpolation is used between slot boundaries.
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func (t *SlotWrapper) Rates() (api.Rates, error) {
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rates, err := t.Tariff.Rates()
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if err != nil {
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return nil, err
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}
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var res api.Rates
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if len(rates) > 0 {
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// assume all slots of equal length
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res = make(api.Rates, 0, len(rates)*max(int(rates[0].End.Sub(rates[0].Start)/SlotDuration), 1))
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}
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now := time.Now().Truncate(SlotDuration)
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for i, r := range rates {
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if !r.End.After(now) { // only keep slots >= now
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continue
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}
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numSlots := max(int(r.End.Sub(r.Start)/SlotDuration), 1)
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for j := range numSlots {
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start := r.Start.Add(time.Duration(j) * SlotDuration)
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end := start.Add(SlotDuration)
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val := r.Value
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switch t.Type() {
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case api.TariffTypeSolar: //, api.TariffTypeCo2
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if i+1 < len(rates) {
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start0 := r.Start
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start1 := rates[i+1].Start
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frac := float64(start.Sub(start0)) / float64(start1.Sub(start0))
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val = r.Value + frac*(rates[i+1].Value-r.Value)
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}
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}
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res = append(res, api.Rate{
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Start: start,
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End: end,
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Value: val,
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})
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}
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}
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return res, nil
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}
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