Extract methods showing voting style information

The idea is that different voting styles will display different
information messages.

app/models/budget/ballot.rb

@@ -17,10 +17,6 @@ class Budget
       investments.sum(:price).to_i
     end
 
-    def formatted_amount_spent(heading)
-      budget.formatted_amount(amount_spent(heading))
-    end
-
     def has_lines_in_group?(group)
       groups.include?(group)
     end
@@ -67,7 +63,9 @@ class Budget
     def voting_style
       @voting_style ||= voting_style_class.new(self)
     end
-    delegate :amount_available, :amount_spent, :enough_money?, :formatted_amount_available,
+    delegate :amount_available, :amount_available_info, :amount_spent, :amount_spent_info,
+             :amount_limit_info, :change_vote_info, :enough_money?, :formatted_amount_available,
+             :formatted_amount_limit, :formatted_amount_spent, :voted_info,
              to: :voting_style
 
     private

app/models/budget/voting_styles/base.rb

@@ -4,4 +4,43 @@ class Budget::VotingStyles::Base
   def initialize(ballot)
     @ballot = ballot
   end
+
+  def name
+    self.class.name.split("::").last.underscore
+  end
+
+  def change_vote_info(link:)
+    I18n.t("budgets.investments.index.sidebar.change_vote_info.#{name}", link: link)
+  end
+
+  def voted_info(heading)
+    I18n.t("budgets.investments.index.sidebar.voted_info.#{name}",
+      count: investments(heading).count,
+      amount_spent: ballot.budget.formatted_amount(investments_price(heading)))
+  end
+
+  def amount_available_info(heading)
+    I18n.t("budgets.ballots.show.amount_available.#{name}",
+           amount: formatted_amount_available(heading))
+  end
+
+  def amount_spent_info(heading)
+    I18n.t("budgets.ballots.show.amount_spent.#{name}",
+           amount: formatted_amount_spent(heading))
+  end
+
+  def amount_limit_info(heading)
+    I18n.t("budgets.ballots.show.amount_limit.#{name}",
+           amount: formatted_amount_limit(heading))
+  end
+
+  private
+
+    def investments(heading)
+      ballot.investments.by_heading(heading.id)
+    end
+
+    def investments_price(heading)
+      investments(heading).sum(:price).to_i
+    end
 end

app/models/budget/voting_styles/knapsack.rb

@@ -4,14 +4,30 @@ class Budget::VotingStyles::Knapsack < Budget::VotingStyles::Base
   end
 
   def amount_available(heading)
-    ballot.budget.heading_price(heading) - amount_spent(heading)
+    amount_limit(heading) - amount_spent(heading)
   end
 
   def amount_spent(heading)
-    ballot.investments.by_heading(heading.id).sum(:price).to_i
+    investments_price(heading)
+  end
+
+  def amount_limit(heading)
+    ballot.budget.heading_price(heading)
   end
 
   def formatted_amount_available(heading)
-    ballot.budget.formatted_amount(amount_available(heading))
+    format(amount_available(heading))
+  end
+
+  def formatted_amount_spent(heading)
+    format(amount_spent(heading))
+  end
+
+  def formatted_amount_limit(heading)
+    format(amount_limit(heading))
+  end
+
+  def format(amount)
+    ballot.budget.formatted_amount(amount)
   end
 end

app/views/budgets/ballot/_ballot.html.erb

@@ -26,14 +26,12 @@
           <h3>
             <%= group.name %> - <%= heading.name %>
           </h3>
-          <%= link_to sanitize(t("budgets.ballots.show.remaining",
-                      amount: @ballot.formatted_amount_available(heading))),
+          <%= link_to sanitize(@ballot.amount_available_info(heading)),
                       budget_group_path(@budget, group) %>
         </div>
         <% if @ballot.has_lines_in_group?(group) %>
           <h4 class="amount-spent text-right">
-            <%= sanitize(t("budgets.ballots.show.amount_spent",
-                           amount: @ballot.formatted_amount_spent(heading))) %>
+            <%= sanitize(@ballot.amount_spent_info(heading)) %>
           </h4>
         <% else %>
           <p>

app/views/budgets/ballot/_progress_bar.html.erb

@@ -1,5 +1,5 @@
 <span class="total-amount">
-  <%= @budget.formatted_heading_price(@heading) %>
+  <%= sanitize(@ballot.amount_limit_info(@heading)) %>
 </span>
 
 <div class="progress" role="progressbar" tabindex="0"

app/views/budgets/investments/_sidebar.html.erb

@@ -14,7 +14,7 @@
 
 <% if @heading && can?(:show, @ballot) %>
   <p class="callout">
-    <%= sanitize(t("budgets.investments.index.sidebar.change_vote_info",
+    <%= sanitize(@ballot.change_vote_info(
         link: link_to(t("budgets.investments.index.sidebar.change_vote_link"),
             budget_ballot_path(@budget)))) %>
   </p>
@@ -39,11 +39,7 @@
 
   <% if @ballot.investments.by_heading(@heading.id).count > 0 %>
     <p>
-      <em>
-        <%= sanitize(t("budgets.investments.index.sidebar.voted",
-            count: @ballot.investments.by_heading(@heading.id).count,
-            amount_spent: @ballot.formatted_amount_spent(@heading))) %>
-      </em>
+      <em><%= sanitize(@ballot.voted_info(@heading)) %></em>
     </p>
   <% elsif @assigned_heading.present? %>
     <p>