Add "Averages" dashboard card.

core/templatetags/duration.py

@@ -10,12 +10,12 @@ register = template.Library()
 
 
 @register.filter
-def duration_string(duration):
+def duration_string(duration, precision='s'):
     """Format a duration (e.g. "2 hours, 3 minutes, 35 seconds")."""
     if not duration:
         return ''
     try:
-        return d_string(duration)
+        return d_string(duration, precision)
     except (ValueError, TypeError):
         return ''
 

core/utils.py

@@ -15,18 +15,20 @@ def filter_by_params(request, model, available_params):
     return queryset
 
 
-def duration_string(duration):
+def duration_string(duration, precision='s'):
     """Format hours, minutes and seconds as a human-friendly string (e.g. "2
-    hours, 25 minutes, 31 seconds")"""
+    hours, 25 minutes, 31 seconds") with precision to h = hours, m = minutes or
+    s = seconds.
+    """
     h, m, s = duration_parts(duration)
 
     duration = ''
     if h > 0:
         duration = '{} hour{}'.format(h, 's' if h > 1 else '')
-    if m > 0:
+    if m > 0 and precision != 'h':
         duration += '{}{} minute{}'.format(
             '' if duration is '' else ', ', m, 's' if m > 1 else '')
-    if s > 0:
+    if s > 0 and precision != 'h' and precision != 'm':
         duration += '{}{} second{}'.format(
             '' if duration is '' else ', ', s, 's' if s > 1 else '')
 
@@ -34,7 +36,8 @@ def duration_string(duration):
 
 
 def duration_parts(duration):
-    """Get hours, minutes and seconds from a timedelta."""
+    """Get hours, minutes and seconds from a timedelta.
+    """
     if not isinstance(duration, timezone.timedelta):
         raise TypeError('Duration provided must be a timedetla')
     h, remainder = divmod(duration.seconds, 3600)

dashboard/static_src/scss/cards.scss

@@ -17,6 +17,21 @@
     }
 }
 
+.card-averages {
+    @extend .border-light;
+
+    .card-header {
+        @extend .text-dark, .bg-light;
+    }
+
+    .card-body {
+        @extend .text-light;
+
+        .container {
+            padding: 0;
+        }
+    }
+}
 
 .card-diaperchange {
     @extend .border-danger;

dashboard/templates/cards/averages.html

@@ -0,0 +1,46 @@
+{% load duration %}
+
+<div class="card card-dashboard card-averages">
+    <div class="card-header">
+         <i class="icon icon-graph pull-left" aria-hidden="true"></i>
+        Averages
+    </div>
+    <div class="card-body">
+        <div class="container">
+            <div class="row no-gutters text-center">
+                <div class="col-6 col-xl-3">
+                    <div class="text-muted">Time asleep</div>
+                    {% if sleep.average %}
+                        {{ sleep.average|duration_string:'m' }}
+                    {% else %}
+                        <em>Not enough data</em>
+                    {% endif %}
+                </div>
+                <div class="col-6 col-xl-3">
+                    <div class="text-muted">Time awake</div>
+                    {% if sleep.btwn_average %}
+                        {{ sleep.btwn_average|duration_string:'m' }}
+                    {% else %}
+                        <em>Not enough data</em>
+                    {% endif %}
+                </div>
+                <div class="col-6 col-xl-3">
+                    <div class="text-muted">Change freq.</div>
+                    {% if changes.btwn_average %}
+                        {{ changes.btwn_average|duration_string:'m' }}
+                    {% else %}
+                        <em>Not enough data</em>
+                    {% endif %}
+                </div>
+                <div class="col-6 col-xl-3">
+                    <div class="text-muted">Feeding freq.</div>
+                    {% if feedings.btwn_average %}
+                        {{ feedings.btwn_average|duration_string:'m' }}
+                    {% else %}
+                        <em>Not enough data</em>
+                    {% endif %}
+                </div>
+            </div>
+        </div>
+    </div>
+</div>

dashboard/templates/dashboard/child.html

@@ -12,6 +12,7 @@
 {% block content %}
     <div id="dashboard-child" class="row align-items-start">
         <div class="col-lg-4 col-md-6 col-sm-12">
+            {% card_averages object %}
             {% card_feeding_last object %}
             {% card_feeding_last_method object %}
             {% card_timer_list %}

dashboard/templatetags/cards.py

@@ -11,6 +11,64 @@ from core.models import DiaperChange, Feeding, Sleep, Timer, TummyTime
 register = template.Library()
 
 
+@register.inclusion_tag('cards/averages.html')
+def card_averages(child):
+    """Averages data for all models.
+    """
+    instances = Sleep.objects.filter(child=child).order_by('start')
+    sleep = {
+        'total': instances.aggregate(Sum('duration'))['duration__sum'],
+        'count': instances.count(),
+        'average': 0,
+        'btwn_total': timezone.timedelta(0),
+        'btwn_count': instances.count() - 1,
+        'btwn_average': 0}
+
+    last_instance = None
+    for instance in instances:
+        if last_instance:
+            sleep['btwn_total'] += instance.start - last_instance.end
+        last_instance = instance
+
+    if sleep['count'] > 0:
+        sleep['average'] = sleep['total']/sleep['count']
+    if sleep['btwn_count'] > 0:
+        sleep['btwn_average'] = sleep['btwn_total']/sleep['btwn_count']
+
+    instances = DiaperChange.objects.filter(child=child).order_by('time')
+    changes = {
+        'btwn_total': timezone.timedelta(0),
+        'btwn_count': instances.count() - 1,
+        'btwn_average': 0}
+    last_instance = None
+
+    for instance in instances:
+        if last_instance:
+            changes['btwn_total'] += instance.time - last_instance.time
+        last_instance = instance
+
+    if changes['btwn_count'] > 0:
+        changes['btwn_average'] = changes['btwn_total']/changes['btwn_count']
+
+    instances = Feeding.objects.filter(child=child).order_by('start')
+    feedings = {
+        'btwn_total': timezone.timedelta(0),
+        'btwn_count': instances.count() - 1,
+        'btwn_average': 0}
+    last_instance = None
+
+    for instance in instances:
+        if last_instance:
+            feedings['btwn_total'] += instance.start - last_instance.end
+        last_instance = instance
+
+    if feedings['btwn_count'] > 0:
+        feedings['btwn_average'] = \
+            feedings['btwn_total']/feedings['btwn_count']
+
+    return {'changes': changes, 'feedings': feedings, 'sleep': sleep}
+
+
 @register.inclusion_tag('cards/diaperchange_last.html')
 def card_diaperchange_last(child):
     """Information about the most recent diaper change.