module Pagy::Frontend

def pagy_bootstrap_responsive_nav(pagy, id=pagy_id)
  tags, link, p_prev, p_next, responsive = {}, pagy_link_proc(pagy, 'class="page-link"'), pagy.prev, pagy.next, pagy.responsive
  tags['before'] = +'<ul class="pagination">'
  tags['before'] << (p_prev ? %(<li class="page-item prev">#{link.call p_prev, pagy_t('pagy.nav.prev'), 'aria-label="previous"'}</li>)
                            : %(<li class="page-item prev disabled"><a href="#" class="page-link">#{pagy_t('pagy.nav.prev')}</a></li>))
  responsive[:items].each do |item| # series example: [1, :gap, 7, 8, "9", 10, 11, :gap, 36]
    tags[item.to_s] = if    item.is_a?(Integer); %(<li class="page-item">#{link.call item}</li>)                                                        # page link
                      elsif item.is_a?(String) ; %(<li class="page-item active">#{link.call item}</li>)                                                 # active page
                      elsif item == :gap       ; %(<li class="page-item gap disabled"><a href="#" class="page-link">#{pagy_t('pagy.nav.gap')}</a></li>) # page gap
                      end
  end
  tags['after'] = +(p_next ? %(<li class="page-item next">#{link.call p_next, pagy_t('pagy.nav.next'), 'aria-label="next"'}</li>)
                           : %(<li class="page-item next disabled"><a href="#" class="page-link">#{pagy_t('pagy.nav.next')}</a></li>))
  tags['after'] << '</ul>'
  script = pagy_json_tag(:responsive, id, tags,  responsive[:widths], responsive[:series])
  %(<nav id="#{id}" class="pagy-nav-responsive-bootstrap pagy-bootstrap-responsive-nav pagination" role="navigation" aria-label="pager"></nav>#{script})
end