module IssuesHelper
  def issue_css_classes(issue)
    classes = "issue"
    classes << " closed" if issue.closed?
    classes << " today" if issue.today?
    classes
  end

  # Returns an OpenStruct object suitable for use by <tt>options_from_collection_for_select</tt>
  # to allow filtering issues by an unassigned User or Milestone
  def unassigned_filter
    # Milestone uses :title, Issue uses :name
    OpenStruct.new(id: 0, title: 'None (backlog)', name: 'Unassigned')
  end

  def url_for_project_issues(project = @project, options = {})
    return '' if project.nil?

    if options[:only_path]
      project.issues_tracker.project_path
    else
      project.issues_tracker.project_url
    end
  end

  def url_for_new_issue(project = @project, options = {})
    return '' if project.nil?

    if options[:only_path]
      project.issues_tracker.new_issue_path
    else
      project.issues_tracker.new_issue_url
    end
  end

  def url_for_issue(issue_iid, project = @project, options = {})
    return '' if project.nil?

    if options[:only_path]
      project.issues_tracker.issue_path(issue_iid)
    else
      project.issues_tracker.issue_url(issue_iid)
    end
  end

  def bulk_update_milestone_options
    options_for_select([['None (backlog)', -1]]) +
        options_from_collection_for_select(project_active_milestones, 'id',
                                           'title', params[:milestone_id])
  end

  def milestone_options(object)
    options_from_collection_for_select(object.project.milestones.active,
                                       'id', 'title', object.milestone_id)
  end

  def issue_box_class(item)
    if item.respond_to?(:expired?) && item.expired?
      'issue-box-expired'
    elsif item.respond_to?(:merged?) && item.merged?
      'issue-box-merged'
    elsif item.closed?
      'issue-box-closed'
    else
      'issue-box-open'
    end
  end

  def issue_to_atom(xml, issue)
    xml.entry do
      xml.id      namespace_project_issue_url(issue.project.namespace,
                                              issue.project, issue)
      xml.link    href: namespace_project_issue_url(issue.project.namespace,
                                                    issue.project, issue)
      xml.title   truncate(issue.title, length: 80)
      xml.updated issue.created_at.strftime("%Y-%m-%dT%H:%M:%SZ")
      xml.media   :thumbnail, width: "40", height: "40", url: avatar_icon(issue.author_email)
      xml.author do |author|
        xml.name issue.author_name
        xml.email issue.author_email
      end
      xml.summary issue.title
    end
  end

  def merge_requests_sentence(merge_requests)
    merge_requests.map(&:to_reference).to_sentence(last_word_connector: ', or ')
  end

  # Required for Gitlab::Markdown::IssueReferenceFilter
  module_function :url_for_issue
end