# See: https://github.com/bootstrap-ruby/will_paginate-bootstrap/blob/master/lib/bootstrap_pagination/bootstrap_renderer.rb
class BootstrapLinkRenderer < WillPaginate::ActionView::LinkRenderer

  ELLIPSIS = "&hellip;"

  def to_html
    list_items = pagination.map do |item|
      case item
        when Fixnum
          page_number(item)
        else
          send(item)
      end
    end.join(@options[:link_separator])

    tag("ul", list_items, class: ul_class)
  end

  def container_attributes
    super.except(*[:link_options])
  end

  protected

  def page_number(page)
    link_options = @options[:link_options] || {}

    if page == current_page
      tag("li", tag("span", page), class: "active")
    else
      tag("li", link(page, page, link_options.merge(rel: rel_value(page))))
    end
  end

  def previous_or_next_page(page, text, classname)
    link_options = @options[:link_options] || {}

    if page
      tag("li", link(text, page, link_options), class: classname)
    else
      tag("li", tag("span", text), class: "%s disabled" % classname)
    end
  end

  def gap
    tag("li", tag("span", ELLIPSIS), class: "disabled")
  end

  def previous_page
    num = @collection.current_page > 1 && @collection.current_page - 1
    previous_or_next_page(num, @options[:previous_label], "prev")
  end

  def next_page
    num = @collection.current_page < @collection.total_pages && @collection.current_page + 1
    previous_or_next_page(num, @options[:next_label], "next")
  end

  def ul_class
    ["pagination", @options[:class]].compact.join(" ")
  end
end