package sensors

import (
	"errors"
	"time"
)

func (s *Sensor) Validate() error {
	if s.SensorID == "" {
		return ErrInvalidSensorIdentifier
	}
	if s.SensorType == "" {
		return ErrInvalidSensorType
	}
	return nil
}

func (d *SensorData) Validate() error {
	if d.SensorID == "" {
		return ErrInvalidSensorIdentifier
	}
	if d.Value == nil {
		return ErrMissingValue
	}
	if d.Timestamp.IsZero() {
		d.Timestamp = time.Now()
	}
	return nil
}

func (d *SensorData) IsOutOfRangeAbove(sensor Sensor) bool {
	return *d.Value > sensor.ThresholdAbove
}

func (d *SensorData) IsOutOfRangeBelow(sensor Sensor) bool {
	return *d.Value < sensor.ThresholdBelow
}

func (r *SensorRequest) Validate() error {
	if r.SensorID == "" {
		return ErrInvalidSensorIdentifier
	}
	return nil
}

func (r *SensorDataRequest) Validate() error {
	if r.SensorID == "" {
		return ErrInvalidSensorIdentifier
	}

	if r.To == "" {
		r.To = time.Now().Format(time.RFC3339)
	} else {
		if _, err := time.Parse(time.RFC3339, r.To); err != nil {
			r.To = time.Now().Format(time.RFC3339)
		}
	}

	if r.From == "" {
		r.From = time.Now().AddDate(0, 0, -7).Format(time.RFC3339)
	} else {
		if _, err := time.Parse(time.RFC3339, r.From); err != nil {
			r.From = time.Now().AddDate(0, 0, -7).Format(time.RFC3339)
		}
	}

	return nil
}

var (
	ErrInvalidSensorIdentifier = errors.New("sensor identifier is required")
	ErrInvalidSensorType       = errors.New("sensor type is required")
	ErrSensorNotFound          = errors.New("sensor not found")
	ErrMissingValue            = errors.New("sensor value no provided")
)