mybuddy/reports/graphs/sleep_totals.py

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# -*- coding: utf-8 -*-
from django.utils import timezone
import plotly.offline as plotly
import plotly.graph_objs as go
from core.utils import duration_parts
from reports import utils
def sleep_totals(instances):
"""
Create a graph showing total time sleeping for each day.
:param instances: a QuerySet of Sleep instances.
:returns: a tuple of the the graph's html and javascript.
"""
totals = {}
for instance in instances:
start = timezone.localtime(instance.start)
end = timezone.localtime(instance.end)
if start.date() not in totals.keys():
totals[start.date()] = timezone.timedelta(seconds=0)
if end.date() not in totals.keys():
totals[end.date()] = timezone.timedelta(seconds=0)
# Account for dates crossing midnight.
if start.date() != end.date():
totals[start.date()] += end.replace(
year=start.year, month=start.month, day=start.day,
hour=23, minute=59, second=59) - start
totals[end.date()] += end - start.replace(
year=end.year, month=end.month, day=end.day, hour=0, minute=0,
second=0)
else:
totals[start.date()] += instance.duration
trace = go.Bar(
name='Total sleep',
x=list(totals.keys()),
y=[td.seconds/3600 for td in totals.values()],
hoverinfo='text',
textposition='outside',
text=[_duration_string_short(td) for td in totals.values()]
)
layout_args = utils.default_graph_layout_options()
layout_args['barmode'] = 'stack'
layout_args['title'] = '<b>Sleep Totals</b>'
layout_args['xaxis']['title'] = 'Date'
layout_args['xaxis']['rangeselector'] = utils.rangeselector_date()
layout_args['yaxis']['title'] = 'Hours of sleep'
fig = go.Figure({
'data': [trace],
'layout': go.Layout(**layout_args)
})
output = plotly.plot(fig, output_type='div', include_plotlyjs=False)
return utils.split_graph_output(output)
def _duration_string_short(duration):
"""
Format a "short" duration string without seconds precision. This is
intended to fit better in smaller spaces on a graph.
:returns: a string of the form XhXm.
"""
h, m, s = duration_parts(duration)
return '{}h{}m'.format(h, m)