# See the Pagy documentation: https://ddnexus.github.io/pagy/extras/navs
# frozen_string_literal: true

require 'pagy/extras/frontend_helpers'

class Pagy # :nodoc:
  # Frontend modules are specially optimized for performance.
  # The resulting code may not look very elegant, but produces the best benchmarks
  module NavsExtra
    # Javascript pagination: it returns a nav and a JSON tag used by the Pagy.nav javascript
    def pagy_nav_js(pagy, pagy_id: nil, link_extra: '', **vars)
      p_id = %( id="#{pagy_id}") if pagy_id
      link = pagy_link_proc(pagy, link_extra: link_extra)
      tags = { 'before' => pagy_nav_prev_html(pagy, link),
               'link'   => %(<span class="page">#{link.call(PAGE_PLACEHOLDER, LABEL_PLACEHOLDER)}</span> ),
               'active' => %(<span class="page active">#{LABEL_PLACEHOLDER}</span> ),
               'gap'    => %(<span class="page gap">#{pagy_t 'pagy.nav.gap'}</span> ),
               'after'  => pagy_nav_next_html(pagy, link) }

      %(<nav#{p_id} class="pagy-njs pagy-nav-js pagination" aria-label="pager" #{
        pagy_json_attr(pagy, :nav, tags, (sequels = pagy.sequels(**vars)), pagy.label_sequels(sequels))}></nav>)
    end

    # Javascript combo pagination: it returns a nav and a JSON tag used by the Pagy.combo_nav javascript
    def pagy_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}" style="padding: 0; text-align: center; width: #{p_pages.to_s.length + 1}rem;">)

      %(<nav#{p_id} class="pagy-combo-nav-js pagination" aria-label="pager" #{
          pagy_json_attr pagy, :combo_nav, p_page, pagy_marked_link(link)}>#{
          pagy_nav_prev_html pagy, link
        }<span class="pagy-combo-input" style="margin: 0 0.6rem;">#{
          pagy_t 'pagy.combo_nav_js', page_input: input, count: p_page, pages: p_pages
        }</span> #{
          pagy_nav_next_html pagy, link
        }</nav>)
    end

    private

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

    def pagy_nav_next_html(pagy, link)
      if (p_next = pagy.next)
        %(<span class="page next">#{link.call p_next, pagy_t('pagy.nav.next'), 'aria-label="next"'}</span>)
      else
        %(<span class="page next disabled">#{pagy_t 'pagy.nav.next'}</span>)
      end
    end
  end
  Frontend.prepend NavsExtra
end