Adds bar graphs with cost

app/models/cost.rb

@@ -1,4 +1,5 @@
 require 'open-uri'
+require 'gr/plot'
 EASY_ENERGY_TARIFFS = {}
 
 # See https://www.belastingdienst.nl/wps/wcm/connect/bldcontentnl/belastingdienst/zakelijk/overige_belastingen/belastingen_op_milieugrondslag/tarieven_milieubelastingen/tabellen_tarieven_milieubelastingen
@@ -50,65 +51,48 @@ class Cost
   end
   
   ######################################################
-  # Easy Energy API (proprietary) - better to use entsoe
+  # Easy Energy - makes use of entsoe, adds EasyEnergy opslag
   ######################################################
   
-  # returns a hash with keys formatted "yyyy-mm-dd-hr" and values [usage, return]
-  # e.g. { 2021-12-16-06"=>[0.36058, 0.298] }
-  def easy_energy_tariffs(date)
-    p "Fetching EasyEnergy tariffs for %s" % date.strftime("%F-%H")
-    
-    # calculate offset (date is in UTC, and we want to have tariffs in Amsterdam zone)
-    zone = 'Amsterdam'
-    offset = DateTime.now.in_time_zone(zone).utc_offset
-    date = date.beginning_of_day.advance(seconds: offset)
-    
-    url = "https://mijn.easyenergy.com/nl/api/tariff/getapxtariffs?startTimestamp=%s&endTimestamp=%s&grouping=" % [date.strftime("%F %T"),date.advance(:hours => 24).strftime("%F %T")]
-    #p urlvandaag
-    json = JSON.load(URI::open(url))
-    # advancing with 1 hrs (to offset for something?)
-    json.map{|t| [DateTime.parse(t["Timestamp"]).strftime("%F-%H"), [t["TariffUsage"], t["TariffReturn"]]]}.to_h      
-  end
-  
   def easy_energy_rate(formatted_hour)
-    unless EASY_ENERGY_TARIFFS.key?(formatted_hour)
-      EASY_ENERGY_TARIFFS.merge!(easy_energy_tariffs(Date.parse(formatted_hour)))
-    end
-    EASY_ENERGY_TARIFFS[formatted_hour]
+    year = Date.parse(formatted_hour).year
+    case year
+    when 2020..2022
+      # opslag, zonder BTW
+      0.00800
+    end  
   end
   
   def easy_energy_cost(formatted_hour, usage_kwh, return_kwh)
     return nil if (usage_kwh.nil? || return_kwh.nil?)
     
-    usage_kwh_cost, return_kwh_cost = easy_energy_rate(formatted_hour)
+    usage_kwh_cost = return_kwh_cost = (entsoe.price_at(formatted_hour)+easy_energy_rate(formatted_hour))*(1+vat_at(Date.parse(formatted_hour)))
     add_tax(formatted_hour, usage_kwh, usage_kwh_cost, return_kwh, return_kwh_cost)
   end
   
-  def easy_energy_high_low(date)
-    hour_start = date.beginning_of_day
+  def easy_energy_hours(date)
+    hour_start = date.in_time_zone(zone).beginning_of_day
     day_end = hour_start.advance(days: 1)
-    max_rate = 0.0
-    min_rate = 100.0
-    min_hour = nil
-    max_hour = nil
+    result = []
     while(hour_start < day_end) do
-       easy_usage_rate, easy_return_rate = easy_energy_rate(hour_start.strftime("%F-%H"))
-       unless easy_usage_rate.nil?
-         # determine max
-         if easy_usage_rate > max_rate
-           max_rate = easy_usage_rate
-           max_hour = hour_start.strftime("%F-%H")
-         end
-         # determine min
-         if easy_usage_rate < min_rate
-           min_rate = easy_usage_rate
-           min_hour = hour_start.strftime("%F-%H")
-         end
-       end
+       formatted_hour = hour_start.strftime("%F %H")
+       result << easy_energy_cost(formatted_hour, 1, 0)
        hour_start = hour_start.advance(:hours => 1)
-    end  
-    return min_hour,max_hour
+    end
+    result
   end
+  
+  def easy_energy_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")
+    xlabel = "uur"
+    ylabel = "EUR"
+    GR.savefig("easy_%s.png" % date.strftime("%F"), title: title, xlabel: xlabel, ylabel: ylabel)
+  end
+  
 
   ######################################################
   # Oxxio rates and cost
@@ -174,7 +158,7 @@ class Cost
   ######################################################
   
   def hours(date, year_shift=0)
-    hour_start = date.in_time_zone("Amsterdam").beginning_of_day
+    hour_start = date.in_time_zone(zone).beginning_of_day
     day_end = hour_start.advance(days: 1)
     result = []
     lowest_hour, highest_hour,high_hours = entsoe.high_low_hours(date.advance(years: year_shift))
@@ -190,7 +174,7 @@ class Cost
       return_kwh = hour_diff[:total_kwh_produced_high] + hour_diff[:total_kwh_produced_low] rescue nil
 
       formatted_hour = hour_start.advance(years: year_shift).strftime("%F %H")
-      entsoe_cost = entsoe_energy_cost(formatted_hour, usage_kwh, return_kwh) # without battery use
+      easy_cost = easy_energy_cost(formatted_hour, usage_kwh, return_kwh) # without battery use
 
       #
       # Make battery work
@@ -210,7 +194,7 @@ class Cost
           end   
         end    
       end       
-      entsoe_cost_with_battery = entsoe_energy_cost(formatted_hour, usage_kwh, return_kwh) # with battery use
+      easy_cost_with_battery = easy_energy_cost(formatted_hour, usage_kwh, return_kwh) # with battery use
             
       #
       # end of battery work
@@ -230,8 +214,8 @@ class Cost
                   return_kwh,
                   battery.battery_kwh,
                   entsoe.price_at(formatted_hour), # entsoe rate
-                  entsoe_cost_with_battery,
-                  entsoe_cost,
+                  easy_cost_with_battery,
+                  easy_cost,
                   oxxio_rate, 
                   oxxio_cost]