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app/models/cost.rb

@@ -45,7 +45,9 @@ class Cost
   end
  
   # Assume: usage_kwh_cost, return_kwh_cost already includes vat
-  def add_tax(formatted_hour,usage_kwh,usage_kwh_cost,return_kwh, return_kwh_cost)
+  # calling this with only 'usage_kwh' parameter returns the tax amount for those kwh only.
+  # 
+  def add_tax(formatted_hour,usage_kwh,usage_kwh_cost=0.0,return_kwh=0.0, return_kwh_cost=0.0)
     return nil if (usage_kwh.nil? || usage_kwh_cost.nil? || return_kwh.nil? || return_kwh_cost.nil?)
     
     vat = 1 + vat_at(Date.parse(formatted_hour))
@@ -117,6 +119,32 @@ class Cost
     g.write("plots/easy_tariff_%s.png" % date.strftime("%F"))
   end
 
+  # calculate the hourly cost (raw!) between start_hour and end_hour
+  # raw means: entsoe prices + VAT
+  def easy_energy_raw_hourly_cost_between(start_hour, end_hour)
+    begin_hour = start_hour
+    costs = []
+    while(begin_hour < end_hour) do
+       # get usage_kwh/return_kwh for one hour
+       begin_hour_plus1 = begin_hour.end_of_hour
+       hour_readings = Reading.where("created_at > :begin AND created_at < :end", {:begin => begin_hour, :end => begin_hour_plus1})
+       hour_diff = hour_readings.last ? hour_readings.last.diff(hour_readings.first) : UNKNOWN_READING
+       # helper to remove distiction between low/high tarif consumption
+       usage_kwh, return_kwh = Reading.consumed_and_produced_for_diff(hour_diff)
+
+       formatted_hour = begin_hour.strftime("%F %H")
+       # calculate RAW price (entsoe price + VAT)
+       kwh_price = entsoe.price_at(formatted_hour)*(1+vat_at(Date.parse(formatted_hour)))
+       hour_cost = (usage_kwh.nil? || return_kwh.nil? || kwh_price.nil?) ? nil : ((usage_kwh-return_kwh)*kwh_price)
+       costs << hour_cost
+       
+        # do the next hour
+        begin_hour = begin_hour.advance(:hours => 1)
+    end
+    # give the result
+    costs
+  end  
+
   # calculate the hourly cost between start_hour and end_hour
   def easy_energy_hourly_cost_between(start_hour, end_hour)
     begin_hour = start_hour
@@ -158,6 +186,26 @@ class Cost
     costs
   end  
 
+  # calculate leveringskosten (entsoe prices + VAT) in one month
+  # date = arbitrary day for the month
+  def easy_energy_raw_cost_in_month(date)
+    hour_start = date.beginning_of_month.in_time_zone(zone).beginning_of_day
+    hour_end = date.end_of_month.in_time_zone(zone).end_of_day
+    # can't get cost for the future
+    hour_end = Time.now if hour_end > Time.now
+
+    easy_energy_raw_hourly_cost_between(hour_start,hour_end)
+  end  
+
+  def easy_energy_cost_in_month(date)
+    hour_start = date.beginning_of_month.in_time_zone(zone).beginning_of_day
+    hour_end = date.end_of_month.in_time_zone(zone).end_of_day
+    # can't get cost for the future
+    hour_end = Time.now if hour_end > Time.now
+
+    easy_energy_hourly_cost_between(hour_start,hour_end)
+  end
+
   def easy_energy_hourly_cost_for(date)
     hour_start = date.in_time_zone(zone).beginning_of_day
     day_end = hour_start.advance(days: 1)
@@ -204,8 +252,9 @@ class Cost
         high_tariff ? 0.47758 : 0.34165  
     end
   end
-    
-  def oxxio_energy_cost(formatted_hour, normaal_kwh, dal_kwh, year_shift=0)
+  
+  # Optional: raw! (tarif + VAT) cost
+  def oxxio_energy_cost(formatted_hour, normaal_kwh, dal_kwh, with_tax=true, year_shift=0)
     return nil if (normaal_kwh.nil? || dal_kwh.nil?)
     #year = Date.parse(formatted_hour).year+year_shift
     date = Date.parse(formatted_hour).advance(years: year_shift)
@@ -236,16 +285,24 @@ class Cost
         normaal_kwh_cost = 0.47758*vat
         dal_kwh_cost = 0.34165*vat   
       else
+        p "Not supported interval Oxxio for value: %d" % date.to_time.to_i
         # catch-all, incase 'formated_hour' is outside any of the cases
         normaal_kwh_cost = 0.0
         dal_kwh_cost = 0.0
     end
-    normaal_cost = add_tax(formatted_hour, normaal_kwh,normaal_kwh_cost,0,0) # return_kwh already accounted for
-    dal_cost = add_tax(formatted_hour, dal_kwh, dal_kwh_cost,0,0)
+    
+    if with_tax
+      normaal_cost = add_tax(formatted_hour, normaal_kwh,normaal_kwh_cost) # return_kwh already accounted for
+      dal_cost = add_tax(formatted_hour, dal_kwh, dal_kwh_cost)
+    else
+      normaal_cost = normaal_kwh*normaal_kwh_cost
+      dal_cost = dal_kwh*dal_kwh_cost
+    end
+
     # result
-    normaal_cost + dal_cost
+    return normaal_cost, dal_cost
   end  
-  
+
   #
   # Entsoe
   #