5 files changed, 40 insertions, 11 deletions

diff --git a/app/controllers/routes_controller.rb b/app/controllers/routes_controller.rb
index 96a23c938..ac243c8eb 100644
--- a/app/controllers/routes_controller.rb
+++ b/app/controllers/routes_controller.rb
@@ -63,7 +63,8 @@ class RoutesController < ChouetteController
   end
 
   def duplicate
-    route = Chouette::Route.find(params[:id]).duplicate
+    source = Chouette::Route.find(params[:id])
+    route = source.duplicate params[:opposite]
     flash[:notice] = t('routes.duplicate.success')
     redirect_to referential_line_path(@referential, route.line)
   end
diff --git a/app/decorators/route_decorator.rb b/app/decorators/route_decorator.rb
index fa6367924..4a173cbb9 100644
--- a/app/decorators/route_decorator.rb
+++ b/app/decorators/route_decorator.rb
@@ -71,6 +71,23 @@ class RouteDecorator < AF83::Decorator
       end
     end
 
+    instance_decorator.action_link(
+      secondary: :show,
+      policy: :create_opposite,
+      if: ->{h.has_feature?(:create_opposite_routes) && object.opposite_route.nil?}
+    ) do |l|
+      l.content h.t('routes.create_opposite.title')
+      l.method :post
+      l.href do
+        h.duplicate_referential_line_route_path(
+          context[:referential],
+          context[:line],
+          object,
+          opposite: true
+        )
+      end
+    end
+
     instance_decorator.destroy_action_link do |l|
       l.data confirm: h.t('routes.actions.destroy_confirm')
     end
diff --git a/app/models/chouette/route.rb b/app/models/chouette/route.rb
index 13288bc6b..65947c392 100644
--- a/app/models/chouette/route.rb
+++ b/app/models/chouette/route.rb
@@ -68,28 +68,34 @@ module Chouette
     validates_presence_of :published_name
     validates_presence_of :line
     validates :wayback, inclusion: { in: self.wayback.values }
-
     after_save :calculate_costs!, if: ->() { TomTom.enabled? }
-
-    def duplicate
+    
+    def duplicate opposite=false
       overrides = {
         'opposite_route_id' => nil,
         'name' => I18n.t('activerecord.copy', name: self.name)
       }
+      keys_for_create = attributes.keys - %w{id objectid created_at updated_at}
       atts_for_create = attributes
-        .slice!(*%w{id objectid created_at updated_at})
+        .slice(*keys_for_create)
         .merge(overrides)
+      if opposite
+        atts_for_create[:wayback] = self.opposite_wayback
+        atts_for_create[:name] = I18n.t('routes.opposite', name: self.name)
+        atts_for_create[:published_name] = atts_for_create[:name]
+        atts_for_create[:opposite_route_id] = self.id
+      end
       new_route = self.class.create!(atts_for_create)
-      duplicate_stop_points(for_route: new_route)
+      duplicate_stop_points(for_route: new_route, opposite: opposite)
       new_route
     end
 
-    def duplicate_stop_points(for_route:)
-      stop_points.each(&duplicate_stop_point(for_route: for_route))
+    def duplicate_stop_points(for_route:, opposite: false)
+      stop_points.each(&duplicate_stop_point(for_route: for_route, opposite: opposite))
     end
-    def duplicate_stop_point(for_route:)
+    def duplicate_stop_point(for_route:, opposite: false)
       -> stop_point do
-        stop_point.duplicate(for_route: for_route)
+        stop_point.duplicate(for_route: for_route, opposite: opposite)
       end
     end
 
diff --git a/app/models/chouette/stop_point.rb b/app/models/chouette/stop_point.rb
index 6b363cd93..da2da998a 100644
--- a/app/models/chouette/stop_point.rb
+++ b/app/models/chouette/stop_point.rb
@@ -39,11 +39,12 @@ module Chouette
       end
     end
 
-    def duplicate(for_route:)
+    def duplicate(for_route:, opposite: false)
       keys_for_create = attributes.keys - %w{id objectid created_at updated_at}
       atts_for_create = attributes
         .slice(*keys_for_create)
         .merge('route_id' => for_route.id)
+      atts_for_create["position"] = self.route.stop_points.size - atts_for_create["position"] if opposite
       self.class.create!(atts_for_create)
     end
 
diff --git a/app/policies/route_policy.rb b/app/policies/route_policy.rb
index 0337a5300..4fcb6be11 100644
--- a/app/policies/route_policy.rb
+++ b/app/policies/route_policy.rb
@@ -20,4 +20,8 @@ class RoutePolicy < ApplicationPolicy
   def duplicate?
     create?
   end
+
+  def create_opposite?
+    create?
+  end
 end