package types

import (
	"fmt"
	"time"
)

type MeasuredValue struct {
	ID           string            `json:"id" xml:"id"`
	Value        float64           `json:"value,string" xml:"value,string"`
	ValueType    MeasuredValueType `json:"value_type" xml:"value_type"`
	FromDate     time.Time         `json:"from_date" xml:"from_date"`
	TillDate     time.Time         `json:"till_date" xml:"till_date"`
	SensorID     string            `json:"sensor_id" xml:"sensor_id"`
	CreationDate time.Time         `json:"creation_date" xml:"creation_date"`
	UpdateDate   *time.Time        `json:"update_date" xml:"update_date"`
}

type MeasuredValueType string

const (
	MeasuredValueTypeHumidity    MeasuredValueType = "humidity"
	MeasuredValueTypePressure    MeasuredValueType = "pressure"
	MeasuredValueTypeTemperature MeasuredValueType = "temperature"
)

var MeasuredValueTypes = []MeasuredValueType{
	MeasuredValueTypeHumidity,
	MeasuredValueTypePressure,
	MeasuredValueTypeTemperature,
}

func SelectMeasuredValues(measuredValueType MeasuredValueType, measuredValues []*MeasuredValue) []*MeasuredValue {
	cachedMeasuredValues := make([]*MeasuredValue, 0)
	for _, measuredValue := range measuredValues {
		if measuredValue.ValueType == measuredValueType {
			cachedMeasuredValues = append(cachedMeasuredValues, measuredValue)
		}
	}

	return cachedMeasuredValues
}

func SelectMeasuredValueType(valueType string) (*MeasuredValueType, error) {
	for _, measuredValueType := range MeasuredValueTypes {
		if fmt.Sprint(measuredValueType) == valueType {
			return &measuredValueType, nil
		}
	}

	return nil, fmt.Errorf("Can not determine value type: %v", valueType)
}