Account namespace updates: part 5 (valuations) (#901)

* Move Valuation to Account namespace

* Move account history to controller

* Clean up valuation controller and views

* Translations and cleanup

* Remove unused scopes and methods

* Pass brakeman

app/models/time_series/trend.rb

@@ -1,16 +1,15 @@
 class TimeSeries::Trend
   include ActiveModel::Validations
 
-  attr_reader :current, :previous
-
-  delegate :favorable_direction, to: :series
+  attr_reader :current, :previous, :favorable_direction
 
   validate :values_must_be_of_same_type, :values_must_be_of_known_type
 
-  def initialize(current:, previous:, series: nil)
+  def initialize(current:, previous:, series: nil, favorable_direction: nil)
     @current = current
     @previous = previous
     @series = series
+    @favorable_direction = get_favorable_direction(favorable_direction)
 
     validate!
   end
@@ -25,6 +24,17 @@ class TimeSeries::Trend
     end.inquiry
   end
 
+  def color
+    case direction
+    when "up"
+      favorable_direction.down? ? red_hex : green_hex
+    when "down"
+      favorable_direction.down? ? green_hex : red_hex
+    else
+      gray_hex
+    end
+  end
+
   def value
     if previous.nil?
       current.is_a?(Money) ? Money.new(0) : 0
@@ -56,8 +66,21 @@ class TimeSeries::Trend
   end
 
   private
+
     attr_reader :series
 
+    def red_hex
+      "#F13636" # red-500
+    end
+
+    def green_hex
+      "#10A861" # green-600
+    end
+
+    def gray_hex
+      "#737373" # gray-500
+    end
+
     def values_must_be_of_same_type
       unless current.class == previous.class || [ previous, current ].any?(&:nil?)
         errors.add :current, "must be of the same type as previous"
@@ -90,4 +113,9 @@ class TimeSeries::Trend
         obj
       end
     end
+
+    def get_favorable_direction(favorable_direction)
+      direction = favorable_direction.presence || series&.favorable_direction
+      (direction.presence_in(TimeSeries::DIRECTIONS) || "up").inquiry
+    end
 end