1 files changed, 31 insertions, 6 deletions

diff --git a/app/helpers/compare_helper.rb b/app/helpers/compare_helper.rb
index 9ece8b0bc5b..b07baf59114 100644
--- a/app/helpers/compare_helper.rb
+++ b/app/helpers/compare_helper.rb
@@ -1,22 +1,47 @@
 # frozen_string_literal: true
 
 module CompareHelper
-  def create_mr_button?(from = params[:from], to = params[:to], project = @project)
+  def create_mr_button?(from: params[:from], to: params[:to], source_project: @project, target_project: @target_project)
     from.present? &&
       to.present? &&
       from != to &&
-      can?(current_user, :create_merge_request_from, project) &&
-      project.repository.branch_exists?(from) &&
-      project.repository.branch_exists?(to)
+      can?(current_user, :create_merge_request_from, source_project) &&
+      can?(current_user, :create_merge_request_in, target_project) &&
+      target_project.repository.branch_exists?(from) &&
+      source_project.repository.branch_exists?(to)
   end
 
-  def create_mr_path(from = params[:from], to = params[:to], project = @project)
+  def create_mr_path(from: params[:from], to: params[:to], source_project: @project, target_project: @target_project)
     project_new_merge_request_path(
-      project,
+      target_project,
       merge_request: {
+        source_project_id: source_project.id,
         source_branch: to,
+        target_project_id: target_project.id,
         target_branch: from
       }
     )
   end
+
+  def target_projects(source_project)
+    MergeRequestTargetProjectFinder
+      .new(current_user: current_user, source_project: source_project, project_feature: :repository)
+      .execute(include_routes: true)
+  end
+
+  def project_compare_selector_data(project, merge_request, params)
+    {
+      project_compare_index_path: project_compare_index_path(project),
+      refs_project_path: refs_project_path(project),
+      params_from: params[:from],
+      params_to: params[:to],
+      project_merge_request_path: merge_request.present? ? project_merge_request_path(project, merge_request) : '',
+      create_mr_path: create_mr_button? ? create_mr_path : ''
+    }.tap do |data|
+      if Feature.enabled?(:compare_repo_dropdown, project, default_enabled: :yaml)
+        data[:project_to] = { id: project.id, name: project.full_path }.to_json
+        data[:projects_from] = target_projects(project).map { |project| { id: project.id, name: project.full_path } }.to_json
+      end
+    end
+  end
 end