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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
from glucometerutils import exceptions
# Constants for units
UNIT_MGDL = 'mg/dL'
UNIT_MMOLL = 'mmol/L'
VALID_UNITS = [UNIT_MGDL, UNIT_MMOLL]
# Constants for date format
DATETIME_12HR = '12 hours'
DATETIME_24HR = '24 hours'
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'])
class Reading(_ReadingBase):
def __init__(self, timestamp, value, meal='', comment=''):
"""Constructor for the 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.
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.
"""
super(Reading, self).__init__(
timestamp=timestamp, value=value, meal=meal, comment=comment)
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)
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