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# -*- coding: utf-8 -*-
"""Common routines for data in glucometers."""
__author__ = 'Diego Elio Pettenò'
__email__ = 'flameeyes@flameeyes.eu'
__copyright__ = 'Copyright © 2013, Diego Elio Pettenò'
__license__ = 'MIT'
import collections
import textwrap
from glucometerutils import exceptions
# Constants for units
UNIT_MGDL = 'mg/dL'
UNIT_MMOLL = 'mmol/L'
VALID_UNITS = [UNIT_MGDL, UNIT_MMOLL]
# Constants for meal information
NO_MEAL = ''
BEFORE_MEAL = 'Before Meal'
AFTER_MEAL = 'After Meal'
# Constants for measure method
BLOOD_SAMPLE = 'blood sample'
CGM = 'CGM' # Continuous Glucose Monitoring
def convert_glucose_unit(value, from_unit, to_unit=None):
"""Convert the given value of glucose level between units.
Args:
value: The value of glucose in the current unit
from_unit: The unit value is currently expressed in
to_unit: The unit to conver the value to: the other if empty.
Returns:
The converted representation of the blood glucose level.
Raises:
exceptions.InvalidGlucoseUnit: If the parameters are incorrect.
"""
if from_unit not in VALID_UNITS:
raise exceptions.InvalidGlucoseUnit(from_unit)
if from_unit == to_unit:
return value
if to_unit is not None:
if to_unit not in VALID_UNITS:
raise exceptions.InvalidGlucoseUnit(to_unit)
if from_unit is UNIT_MGDL:
return round(value / 18.0, 2)
else:
return round(value * 18.0, 0)
_ReadingBase = collections.namedtuple(
'_ReadingBase', ['timestamp', 'value', 'meal', 'comment', 'measure_method'])
class GlucoseReading(_ReadingBase):
def __new__(cls, timestamp, value, meal=NO_MEAL, comment='',
measure_method=BLOOD_SAMPLE):
"""Constructor for the glucose reading object.
Args:
timestamp: (datetime) Timestamp of the reading as reported by the meter.
value: (float) Value of the reading, in mg/dL.
meal: (string) Meal-relativeness as reported by the reader, if any.
comment: (string) Comment reported by the reader, if any.
measure_method: (string) Measure method as reported by the reader if any,
assuming blood sample otherwise.
The value is stored in mg/dL, even though this is not the standard value,
because at least most of the LifeScan devices report the raw data in this
format.
"""
return super(Reading, cls).__new__(
cls, timestamp=timestamp, value=value, meal=meal, comment=comment,
measure_method=measure_method)
def get_value_as(self, to_unit):
"""Returns the reading value as the given unit.
Args:
to_unit: (UNIT_MGDL|UNIT_MMOLL) The unit to return the value to.
"""
return convert_glucose_unit(self.value, UNIT_MGDL, to_unit)
def as_csv(self, unit):
"""Returns the reading as a formatted comma-separated value string."""
return '"%s","%.2f","%s","%s","%s"' % (
self.timestamp, self.get_value_as(unit), self.meal, self.measure_method,
self.comment)
_MeterInfoBase = collections.namedtuple(
'_MeterInfoBase', ['model', 'serial_number', 'version_info', 'native_unit'])
class MeterInfo(_MeterInfoBase):
def __new__(cls, model, serial_number='N/A', version_info=(),
native_unit=UNIT_MGDL):
"""Construct a meter information object.
Args:
model: (string) Human-readable model name, depending on driver.
serial_number: (string) Optional serial number to identify the device.
version_info: (list(string)) Optional hardware/software version information.
native_unit: (UNIT_MGDL|UNIT_MMOLL) Native unit of the device for display.
"""
return super(MeterInfo, cls).__new__(
cls, model=model, serial_number=serial_number, version_info=version_info,
native_unit=native_unit)
def __str__(self):
version_information_string = 'N/A'
if self.version_info:
version_information_string = '\n '.join(self.version_info).strip()
return textwrap.dedent("""\
{model}
Serial Number: {serial_number}
Version Information:
{version_information_string}
Native Unit: {native_unit}
""").format(model=self.model, serial_number=self.serial_number,
version_information_string=version_information_string,
native_unit=self.native_unit)
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