# frozen_string_literal: true

module NavHelper
  extend self

  def header_links
    @header_links ||= get_header_links
  end

  def header_link?(link)
    header_links.include?(link)
  end

  def page_with_sidebar_class
    class_name = page_gutter_class

    class_name << 'page-with-super-sidebar'
    class_name << 'page-with-super-sidebar-collapsed' if collapsed_super_sidebar?

    class_name -= ['right-sidebar-expanded'] if defined?(@right_sidebar) && !@right_sidebar

    class_name
  end

  def super_sidebar_loading_state_class
    cookies['super_sidebar_collapsed'] == 'true' ? 'super-sidebar-is-icon-only' : ''
  end

  def page_gutter_class
    if (page_has_markdown? || current_path?('projects/merge_requests#diffs')) && !current_controller?('conflicts')
      if cookies[:collapsed_gutter] == 'true'
        ["page-gutter", ('right-sidebar-collapsed' unless skip_right_sidebar_classes?).to_s]
      else
        ["page-gutter", ('right-sidebar-expanded' unless skip_right_sidebar_classes?).to_s]
      end
    elsif current_path?('jobs#show')
      %w[page-gutter build-sidebar right-sidebar-expanded]
    elsif current_controller?('wikis') &&
        current_action?('show', 'create', 'edit', 'update', 'history', 'git_access', 'destroy', 'diff')
      %w[page-gutter has-wiki-sidebar]
    else
      []
    end
  end

  def page_has_markdown?
    current_path?('projects/merge_requests#show') ||
      current_path?('projects/merge_requests/conflicts#show') ||
      current_path?('issues#show') ||
      current_path?('milestones#show') ||
      current_path?('issues#designs') ||
      current_path?('incidents#show')
  end

  def admin_monitoring_nav_links
    %w[system_info background_migrations background_jobs health_check]
  end

  private

  def get_header_links
    links = if current_user
              [:user_dropdown]
            else
              [:sign_in]
            end

    if can?(current_user, :read_cross_project)
      links += [:issues, :merge_requests, :todos] if current_user.present?
    end

    if @project&.persisted? || can?(current_user, :read_cross_project)
      links << :search
    end

    if session[:impersonator_id]
      links << :admin_impersonation
    end

    if Gitlab::CurrentSettings.admin_mode && current_user_mode.admin_mode?
      links << :admin_mode
    end

    links
  end

  def merge_request_sidebar?
    current_controller?('merge_requests')
  end

  def work_item_epic_page?
    current_controller?('epics')
  end

  def new_issue_look?
    current_controller?('issues') && @issue&.show_as_work_item?
  end

  def skip_right_sidebar_classes?
    merge_request_sidebar? || work_item_epic_page? || new_issue_look?
  end
end

NavHelper.prepend_mod_with('NavHelper')
