# See the Pagy documentation: https://ddnexus.github.io/pagy/extras/bulma
# 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 BulmaExtra
    # Pagination for Bulma: it returns the html with the series of links to the pages
    def pagy_bulma_nav(pagy, pagy_id: nil, link_extra: '', **vars)
      p_id = %( id="#{pagy_id}") if pagy_id
      link = pagy_link_proc(pagy, link_extra: link_extra)

      html = +%(<nav#{p_id} class="pagy-bulma-nav pagination is-centered" aria-label="pagination">)
      html << pagy_bulma_prev_next_html(pagy, link)
      html << %(<ul class="pagination-list">)
      pagy.series(**vars).each do |item| # series example: [1, :gap, 7, 8, "9", 10, 11, :gap, 36]
        html << case item
                when Integer
                  %(<li>#{link.call item, pagy.label_for(item), %(class="pagination-link" aria-label="goto page #{item}")}</li>)
                when String
                  %(<li>#{link.call item, pagy.label_for(item),
                                    %(class="pagination-link is-current" aria-label="page #{item}" aria-current="page")}</li>)
                when :gap
                  %(<li><span class="pagination-ellipsis">#{pagy_t 'pagy.nav.gap'}</span></li>)
                else raise InternalError, "expected item types in series to be Integer, String or :gap; got #{item.inspect}"
                end
      end
      html << %(</ul></nav>)
    end

    def pagy_bulma_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_bulma_prev_next_html(pagy, link)}<ul class="pagination-list">),
               'link'   => %(<li>#{link.call PAGE_PLACEHOLDER, LABEL_PLACEHOLDER,
                                             %(class="pagination-link" aria-label="goto page #{PAGE_PLACEHOLDER}")}</li>),
               'active' => %(<li>#{link.call PAGE_PLACEHOLDER, LABEL_PLACEHOLDER,
                                             %(class="pagination-link is-current" aria-current="page" aria-label="page #{
                                                 PAGE_PLACEHOLDER}")}</li>),
               'gap'    => %(<li><span class="pagination-ellipsis">#{pagy_t 'pagy.nav.gap'}</span></li>),
               'after'  => '</ul>' }

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

    # Javascript combo pagination for Bulma: it returns a nav and a JSON tag used by the Pagy.combo_nav javascript
    def pagy_bulma_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 class="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; margin:0 0.3rem;">)

      html = %(<nav#{p_id} class="pagy-bulma-combo-nav-js" aria-label="pagination">)
      %(#{html}<div class="field is-grouped is-grouped-centered" role="group" #{
          pagy_json_attr pagy, :combo_nav, p_page, pagy_marked_link(link)}>#{
          if (p_prev  = pagy.prev)
            %(<p class="control">#{link.call p_prev, pagy_t('pagy.nav.prev'), 'class="button" aria-label="previous page"'}</p>)
          else
            %(<p class="control"><a class="button" disabled>#{pagy_t 'pagy.nav.prev'}</a></p>)
          end
        }<div class="pagy-combo-input control level is-mobile">#{
          pagy_t 'pagy.combo_nav_js', page_input: input, count: p_page, pages: p_pages}</div>#{
          if (p_next  = pagy.next)
            %(<p class="control">#{link.call p_next, pagy_t('pagy.nav.next'), 'class="button" aria-label="next page"'}</p>)
          else
            %(<p class="control"><a class="button" disabled>#{pagy_t 'pagy.nav.next'}</a></p>)
          end
        }</div></nav>)
    end

    private

    def pagy_bulma_prev_next_html(pagy, link)
      html = +if (p_prev = pagy.prev)
                link.call p_prev, pagy_t('pagy.nav.prev'), 'class="pagination-previous" aria-label="previous page"'
              else
                %(<a class="pagination-previous" disabled>#{pagy_t 'pagy.nav.prev'}</a>)
              end
      html << if (p_next = pagy.next)
                link.call p_next, pagy_t('pagy.nav.next'), 'class="pagination-next" aria-label="next page"'
              else
                %(<a class="pagination-next" disabled>#{pagy_t 'pagy.nav.next'}</a>)
              end
    end
  end
  Frontend.prepend BulmaExtra
end