Adds actual cost barplot

app/models/cost.rb

@@ -82,15 +82,44 @@ class Cost
     result
   end
   
-  def easy_energy_barplot(date)
+  def easy_energy_tariff_barplot(date)
     hours = (0..23).to_a
     costs = easy_energy_hours(date)
     GR.barplot(hours,costs)
     # make sure you have set GKS_WSTYPE=100 in the environment (for headless setup)
-    title = "Kosten per kwH (incl. belastingen en BTW) - %s" % date.strftime("%A, %e %B %Y")
+    title = "Tarief per kwH (incl. belastingen en BTW) - %s" % date.strftime("%A, %e %B %Y")
     xlabel = "uur"
     ylabel = "EUR"
-    GR.savefig("easy_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
+    GR.savefig("easy_tariff_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
+  end
+  
+  def easy_energy_cost_barplot(date)
+    hour_start = date.in_time_zone(zone).beginning_of_day
+    day_end = hour_start.advance(days: 1)
+    costs = []
+    while(hour_start < day_end) do
+       # get usage_kwh/return_kwh for one hour
+       hour_end = hour_start.end_of_hour
+       hour_readings = Reading.where("created_at > :begin AND created_at < :end", {:begin => hour_start, :end => hour_end})
+       hour_diff = hour_readings.last ? hour_readings.last.diff(hour_readings.first) : UNKNOWN_READING
+       usage_kwh = hour_diff[:total_kwh_consumed_high] + hour_diff[:total_kwh_consumed_low] 
+       return_kwh = hour_diff[:total_kwh_produced_high] + hour_diff[:total_kwh_produced_low]
+        
+       formatted_hour = hour_start.strftime("%F %H")
+       costs << easy_energy_cost(formatted_hour, usage_kwh, return_kwh)
+       # do the next hour
+       hour_start = hour_start.advance(:hours => 1)
+    end
+    
+    # create plot
+    hours = (0..23).to_a
+    GR.barplot(hours,costs)
+    # make sure you have set GKS_WSTYPE=100 in the environment (for headless setup)
+    title = "Verbruikskosten (incl. belastingen en BTW) - %s" % date.strftime("%A, %e %B %Y")
+    xlabel = "uur"
+    ylabel = "EUR"
+    GR.savefig("easy_cost_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
+
   end