1 files changed, 128 insertions, 0 deletions
diff --git a/app/controllers/projects/merge_requests/creations_controller.rb b/app/controllers/projects/merge_requests/creations_controller.rb
new file mode 100644
index 00000000000..f35d53896ba
--- /dev/null
+++ b/app/controllers/projects/merge_requests/creations_controller.rb
@@ -0,0 +1,128 @@
+class Projects::MergeRequests::CreationsController < Projects::MergeRequests::ApplicationController
+  include DiffForPath
+  include DiffHelper
+
+  skip_before_action :merge_request
+  skip_before_action :ensure_ref_fetched
+  before_action :authorize_create_merge_request!
+  before_action :apply_diff_view_cookie!, only: [:diffs, :diff_for_path]
+  before_action :build_merge_request, except: [:create]
+
+  def new
+    define_new_vars
+  end
+
+  def create
+    @target_branches ||= []
+    @merge_request = ::MergeRequests::CreateService.new(project, current_user, merge_request_params).execute
+
+    if @merge_request.valid?
+      redirect_to(merge_request_path(@merge_request))
+    else
+      @source_project = @merge_request.source_project
+      @target_project = @merge_request.target_project
+
+      define_new_vars
+      render action: "new"
+    end
+  end
+
+  def pipelines
+    @pipelines = @merge_request.all_pipelines
+
+    Gitlab::PollingInterval.set_header(response, interval: 10_000)
+
+    render json: {
+      pipelines: PipelineSerializer
+      .new(project: @project, current_user: @current_user)
+      .represent(@pipelines)
+    }
+  end
+
+  def diffs
+    @diffs = if @merge_request.can_be_created
+               @merge_request.diffs(diff_options)
+             else
+               []
+             end
+    @diff_notes_disabled = true
+
+    @environment = @merge_request.environments_for(current_user).last
+
+    render json: { html: view_to_html_string('projects/merge_requests/creations/_diffs', diffs: @diffs, environment: @environment) }
+  end
+
+  def diff_for_path
+    @diffs = @merge_request.diffs(diff_options)
+    @diff_notes_disabled = true
+
+    render_diff_for_path(@diffs)
+  end
+
+  def branch_from
+    # This is always source
+    @source_project = @merge_request.nil? ? @project : @merge_request.source_project
+
+    if params[:ref].present?
+      @ref = params[:ref]
+      @commit = @repository.commit("refs/heads/#{@ref}")
+    end
+
+    render layout: false
+  end
+
+  def branch_to
+    @target_project = selected_target_project
+
+    if params[:ref].present?
+      @ref = params[:ref]
+      @commit = @target_project.commit("refs/heads/#{@ref}")
+    end
+
+    render layout: false
+  end
+
+  def update_branches
+    @target_project = selected_target_project
+    @target_branches = @target_project.repository.branch_names
+
+    render layout: false
+  end
+
+  private
+
+  def build_merge_request
+    params[:merge_request] ||= ActionController::Parameters.new(source_project: @project)
+    @merge_request = ::MergeRequests::BuildService.new(project, current_user, merge_request_params.merge(diff_options: diff_options)).execute
+  end
+
+  def define_new_vars
+    @noteable = @merge_request
+
+    @target_branches = if @merge_request.target_project
+                         @merge_request.target_project.repository.branch_names
+                       else
+                         []
+                       end
+
+    @target_project = @merge_request.target_project
+    @source_project = @merge_request.source_project
+    @commits = @merge_request.commits
+    @commit = @merge_request.diff_head_commit
+
+    @note_counts = Note.where(commit_id: @commits.map(&:id))
+      .group(:commit_id).count
+
+    @labels = LabelsFinder.new(current_user, project_id: @project.id).execute
+
+    set_pipeline_variables
+  end
+
+  def selected_target_project
+    if @project.id.to_s == params[:target_project_id] || @project.forked_project_link.nil?
+      @project
+    else
+      @project.forked_project_link.forked_from_project
+    end
+  end
+end