module Gitlab
  module MergeRequestsHelper
    def new_mr_path_from_push_event(event)
      target_project = event.project.forked_from_project || event.project
      new_namespace_project_merge_request_path(
        event.project.namespace,
        event.project,
        new_mr_from_push_event(event, target_project)
      )
    end

    def new_mr_path_for_fork_from_push_event(event)
      new_namespace_project_merge_request_path(
        event.project.namespace,
        event.project,
        new_mr_from_push_event(event, event.project.forked_from_project)
      )
    end

    def new_mr_from_push_event(event, target_project)
      {
        merge_request: {
          source_project_id: event.project.id,
          target_project_id: target_project.id,
          source_branch: event.branch_name,
          target_branch: target_project.repository.root_ref
        }
      }
    end

    def mr_css_classes(mr)
      classes = "merge-request"
      classes << " closed" if mr.closed?
      classes << " merged" if mr.merged?
      classes
    end

    def ci_build_details_path(merge_request)
      merge_request.source_project.ci_service.build_page(merge_request.last_commit.sha, merge_request.source_branch)
    end

    def merge_path_description(merge_request, separator)
      if merge_request.for_fork?
        "Project:Branches: #{@merge_request.source_project_path}:#{@merge_request.source_branch} #{separator} #{@merge_request.target_project.path_with_namespace}:#{@merge_request.target_branch}"
      else
        "Branches: #{@merge_request.source_branch} #{separator} #{@merge_request.target_branch}"
      end
    end

    def issues_sentence(issues)
      issues.map { |i| "##{i.iid}" }.to_sentence
    end

    def mr_change_branches_path(merge_request)
      new_namespace_project_merge_request_path(
        @project.namespace, @project,
        merge_request: {
          source_project_id: @merge_request.source_project_id,
          target_project_id: @merge_request.target_project_id,
          source_branch: @merge_request.source_branch,
          target_branch: nil
        }
      )
    end

    def source_branch_with_namespace(merge_request)
      if merge_request.for_fork?
        namespace = link_to(merge_request.source_project_namespace,
          project_path(merge_request.source_project))
        namespace + ":#{merge_request.source_branch}"
      else
        merge_request.source_branch
      end
    end
  end
end