package services

type SensorsService struct {
	ctx *Context
}

type sensorItem struct {
	Sensor     string            `json:"sensor"`
	LastUpdate string            `json:"lastUpdate"`
	Config     map[string]string `json:"config"`
}

func (s *SensorsService) GetList() ([]sensorItem, error) {
	var sensors []sensorItem
	var sensor string
	var lastUpdate string

	rows, err := s.ctx.DB.Query("SELECT sensor, MAX(timestamp) last_update FROM sensor_values GROUP BY sensor")

	if err != nil {
		return nil, err
	}

	defer rows.Close()

	for rows.Next() {
		err := rows.Scan(&sensor, &lastUpdate)
		if err != nil {
			return nil, err
		}

		config, err := s.ctx.Services.SensorConfig.GetValues(sensor)

		if err != nil {
			return nil, err
		}

		sensors = append(sensors, sensorItem{Sensor: sensor, LastUpdate: lastUpdate, Config: config})
	}

	err = rows.Err()
	if err != nil {
		return nil, err
	}

	return sensors, nil
}