Add RegulatedCosts class

.rubocop.yml

@@ -56,6 +56,9 @@ Style/Documentation:
   Enabled: false
 Style/FrozenStringLiteralComment:
   EnforcedStyle: never
+Style/HashTransformValues:
+  Exclude:
+    - "**/app/lib/regulated_costs.rb"
 Style/OpenStructUse:
   Exclude:
     - "**/test/**/*"

app/lib/energy_period.rb

@@ -1,4 +1,6 @@
 class EnergyPeriod
+  PERIODS = %i[peak standard off_peak].freeze
+
   def self.for(time)
     new(time).for
   end

app/lib/regulated_costs.rb

@@ -0,0 +1,48 @@
+class RegulatedCosts
+  COSTS = %i[transport distribution charges].freeze
+
+  def self.for(time_or_date)
+    new(time_or_date).for
+  end
+
+  def initialize(time_or_date)
+    @time_or_date = time_or_date
+  end
+
+  def for
+    if @time_or_date.is_a?(Date)
+      for_date
+    elsif @time_or_date.is_a?(Time)
+      for_time
+    end
+  end
+
+  private
+
+  def for_date
+    costs[@time_or_date.year.to_s]
+  end
+
+  def for_time
+    for_date[EnergyPeriod.for(@time_or_date)]
+  end
+
+  def prices
+    # [year, [[peak_transport, peak_distribution, peak_charges], [standard...], [off_peak...]]]
+    [
+      ["2023", [[0.004506, 0.024592, 0.043893], [0.003050, 0.016744, 0.008779], [0.000128, 0.000852, 0.002195]]],
+      ["2024", [[0.004528, 0.028553, 0.043893], [0.002589, 0.016595, 0.008779], [0.000075, 0.000482, 0.002195]]]
+    ]
+  end
+
+  def costs
+    prices.to_h do |year, periods|
+      [
+        year,
+        EnergyPeriod::PERIODS.each_with_index.to_h do |period, period_index|
+          [period, COSTS.each_with_index.to_h { |type, type_index| [type, periods[period_index][type_index]] }]
+        end
+      ]
+    end
+  end
+end