44 lines
1 KiB
Go
44 lines
1 KiB
Go
package api
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import (
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"fmt"
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"slices"
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"time"
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)
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// Rate is a grid tariff rate
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type Rate struct {
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Start time.Time `json:"start"`
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End time.Time `json:"end"`
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Price float64 `json:"price"`
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}
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// IsEmpty returns is the rate is the zero value
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func (r Rate) IsEmpty() bool {
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return r.Start.IsZero() && r.End.IsZero() && r.Price == 0
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}
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// Rates is a slice of (future) tariff rates
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type Rates []Rate
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// Sort rates by start time
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func (r Rates) Sort() {
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slices.SortStableFunc(r, func(i, j Rate) int {
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return i.Start.Compare(j.Start)
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})
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}
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// Current returns the rates current rate or error
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func (r Rates) Current(now time.Time) (Rate, error) {
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for _, rr := range r {
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if !rr.Start.After(now) && rr.End.After(now) {
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return rr, nil
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}
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}
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if len(r) == 0 {
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return Rate{}, fmt.Errorf("no matching rate for: %s", now.Local().Format(time.RFC3339))
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}
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return Rate{}, fmt.Errorf("no matching rate for: %s, %d rates (%s to %s)",
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now.Local().Format(time.RFC3339), len(r), r[0].Start.Local().Format(time.RFC3339), r[len(r)-1].End.Local().Format(time.RFC3339))
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}
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