module Pagy::BootstrapExtra

def pagy_bootstrap_combo_nav_js(pagy, pagy_id: nil, link_extra: '')
  p_id    = %( id="#{pagy_id}") if pagy_id
  link    = pagy_link_proc(pagy, link_extra: link_extra)
  p_page  = pagy.page
  p_pages = pagy.pages
  input   = %(<input type="number" min="1" max="#{p_pages}" value="#{
                p_page}" class="text-primary" style="padding: 0; border: none; text-align: center; width: #{
                p_pages.to_s.length + 1}rem;">)
  %(<nav#{p_id} class="pagy-bootstrap-combo-nav-js pagination" aria-label="pager"><div class="btn-group" role="group" #{
      pagy_json_attr pagy, :combo_nav, p_page, pagy_marked_link(link)}>#{
      if (p_prev = pagy.prev)
        link.call p_prev, pagy_t('pagy.nav.prev'), 'aria-label="previous" class="prev btn btn-primary"'
      else
        %(<a class="prev btn btn-primary disabled" href="#">#{pagy_t('pagy.nav.prev')}</a>)
      end
    }<div class="pagy-combo-input btn btn-primary disabled" style="white-space: nowrap;">#{
      pagy_t 'pagy.combo_nav_js', page_input: input, count: p_page, pages: p_pages}</div>#{
      if (p_next  = pagy.next)
        link.call p_next, pagy_t('pagy.nav.next'), 'aria-label="next" class="next btn btn-primary"'
      else
        %(<a class="next btn btn-primary disabled" href="#">#{pagy_t 'pagy.nav.next'}</a>)
      end
    }</div></nav>)
end

def pagy_bootstrap_nav(pagy, pagy_id: nil, link_extra: '')
  p_id = %( id="#{pagy_id}") if pagy_id
  link = pagy_link_proc(pagy, link_extra: %(class="page-link" #{link_extra}))
  html = +%(<nav#{p_id} class="pagy-bootstrap-nav" aria-label="pager"><ul class="pagination">)
  html << pagy_bootstrap_prev_html(pagy, link)
  pagy.series.each do |item| # series example: [1, :gap, 7, 8, "9", 10, 11, :gap, 36]
    html << case item
            when Integer
              %(<li class="page-item">#{link.call item}</li>)
            when String
              %(<li class="page-item active">#{link.call item}</li>)
            when :gap
              %(<li class="page-item gap disabled"><a href="#" class="page-link">#{pagy_t 'pagy.nav.gap'}</a></li>)
            else raise InternalError, "expected item types in series to be Integer, String or :gap; got #{item.inspect}"
            end
  end
  html << pagy_bootstrap_next_html(pagy, link)
  html << %(</ul></nav>)
end

def pagy_bootstrap_nav_js(pagy, pagy_id: nil, link_extra: '', steps: nil)
  p_id = %( id="#{pagy_id}") if pagy_id
  link = pagy_link_proc(pagy, link_extra: %(class="page-link" #{link_extra}))
  tags = { 'before' => %(<ul class="pagination">#{pagy_bootstrap_prev_html pagy, link}),
           'link'   => %(<li class="page-item">#{mark = link.call(PAGE_PLACEHOLDER)}</li>),
           'active' => %(<li class="page-item active">#{mark}</li>),
           'gap'    => %(<li class="page-item gap disabled"><a href="#" class="page-link">#{pagy_t 'pagy.nav.gap'}</a></li>),
           'after'  => %(#{pagy_bootstrap_next_html pagy, link}</ul>) }
  %(<nav#{p_id} class="pagy-njs pagy-bootstrap-nav-js" aria-label="pager" #{
      pagy_json_attr(pagy, :nav, tags, pagy.sequels(steps))}></nav>)
end

def pagy_bootstrap_next_html(pagy, link)
  if (p_next = pagy.next)
    %(<li class="page-item next">#{link.call p_next, pagy_t('pagy.nav.next'), 'aria-label="next"'}</li>)
  else
    %(<li class="page-item next disabled"><a href="#" class="page-link">#{pagy_t 'pagy.nav.next'}</a></li>)
  end
end

def pagy_bootstrap_prev_html(pagy, link)
  if (p_prev = pagy.prev)
    %(<li class="page-item prev">#{link.call p_prev, pagy_t('pagy.nav.prev'), 'aria-label="previous"'}</li>)
  else
    %(<li class="page-item prev disabled"><a href="#" class="page-link">#{pagy_t 'pagy.nav.prev'}</a></li>)
  end
end