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sensitivities.go
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/
sensitivities.go
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package medtronic
import (
"time"
)
// InsulinSensitivity represents an entry in an insulin sensitivity schedule.
type InsulinSensitivity struct {
Start TimeOfDay
Sensitivity Glucose // glucose reduction per insulin unit
Units GlucoseUnitsType
}
// InsulinSensitivitySchedule represents an insulin sensitivity schedule.
type InsulinSensitivitySchedule []InsulinSensitivity
func decodeInsulinSensitivitySchedule(data []byte, units GlucoseUnitsType) InsulinSensitivitySchedule {
var sched []InsulinSensitivity
for i := 0; i < len(data)-1; i += 2 {
n := data[i]
start := halfHoursToTimeOfDay(n & 0x3F)
if start == 0 && len(sched) != 0 {
break
}
s := int((n>>6)&0x1)<<8 | int(data[i+1])
sched = append(sched, InsulinSensitivity{
Start: start,
Sensitivity: intToGlucose(s, units),
Units: units,
})
}
return sched
}
// InsulinSensitivities returns the pump's insulin sensitivity schedule.
func (pump *Pump) InsulinSensitivities() InsulinSensitivitySchedule {
data := pump.Execute(insulinSensitivities)
if pump.Error() != nil {
return InsulinSensitivitySchedule{}
}
if len(data) < 2 || (data[0]-1)%2 != 0 {
pump.BadResponse(insulinSensitivities, data)
return InsulinSensitivitySchedule{}
}
n := int(data[0]) - 1
units := GlucoseUnitsType(data[1])
return decodeInsulinSensitivitySchedule(data[2:2+n], units)
}
// InsulinSensitivityAt returns the insulin sensitivity in effect at the given time.
func (s InsulinSensitivitySchedule) InsulinSensitivityAt(t time.Time) InsulinSensitivity {
d := SinceMidnight(t)
last := InsulinSensitivity{}
for _, v := range s {
if v.Start > d {
break
}
last = v
}
return last
}