danbooru/app/presenters/post_presenter.rb

class PostPresenter < Presenter
  attr_reader :pool, :next_post_in_pool
  delegate :tag_list_html, :split_tag_list_html, :split_tag_list_text, :inline_tag_list_html, to: :tag_set_presenter

  def self.preview(post, options = {})
    if post.nil?
      return "<em>none</em>".html_safe
    end

    if !options[:show_deleted] && post.is_deleted? && options[:tags] !~ /status:(?:all|any|deleted|banned)/ && !options[:raw]
      return ""
    end

    if !post.visible?
      return ""
    end

    if post.is_ugoira? && !post.has_ugoira_webm?
      # ugoira preview gen is async so dont render it immediately
      return ""
    end

    locals = {}

    locals[:article_attrs] = {
      "id" => "post_##{post.id}",
      "class" => preview_class(post, options).join(" ")
    }.merge(data_attributes(post))

    # TODO: rename path_prefix to controller
    locals[:link_params] = {
      "controller" => options[:path_prefix] || "posts",
      "action" => "show",
      "id" => post.id
    }
    if options[:tags].present? && !CurrentUser.is_anonymous?
      locals[:link_params]["q"] = options[:tags]
    end
    if options[:pool_id] || options[:pool]
      locals[:link_params]["pool_id"] = options[:pool_id] || options[:pool].id
    end
    if options[:favgroup_id] || options[:favgroup]
      locals[:link_params]["favgroup_id"] = options[:favgroup_id] || options[:favgroup].id
    end

    locals[:tooltip] = "#{post.tag_string} rating:#{post.rating} score:#{post.score}"

    locals[:cropped_url] = if Danbooru.config.enable_image_cropping && options[:show_cropped] && post.has_cropped? && !CurrentUser.user.disable_cropped_thumbnails?
      post.crop_file_url
    else
      post.preview_file_url
    end

    locals[:preview_url] = post.preview_file_url

    locals[:alt_text] = post.tag_string

    locals[:has_cropped] = post.has_cropped?

    if options[:pool]
      locals[:pool] = options[:pool]
    else
      locals[:pool] = nil
    end

    if options[:similarity]
      locals[:similarity] = options[:similarity].round
      locals[:width] = post.image_width
      locals[:height] = post.image_height
    else
      locals[:similarity] = nil
    end

    if options[:size]
      locals[:size] = post.file_size
    else
      locals[:size] = nil
    end

    ApplicationController.render(partial: "posts/partials/index/preview", locals: locals)
  end

  def self.preview_class(post, options = {})
    klass = ["post-preview"]
    # klass << " large-cropped" if post.has_cropped? && options[:show_cropped]
    klass << "captioned" if options.values_at(:pooled, :size, :similarity).any?(&:present?)
    klass << "post-status-pending" if post.is_pending?
    klass << "post-status-flagged" if post.is_flagged?
    klass << "post-status-deleted" if post.is_deleted?
    klass << "post-status-has-parent" if post.parent_id
    klass << "post-status-has-children" if post.has_visible_children?
    klass
  end

  def self.data_attributes(post)
    attributes = {
      "data-id" => post.id,
      "data-has-sound" => post.has_tag?('video_with_sound|flash_with_sound'),
      "data-tags" => post.tag_string,
      "data-pools" => post.pool_string,
      "data-approver-id" => post.approver_id,
      "data-rating" => post.rating,
      "data-width" => post.image_width,
      "data-height" => post.image_height,
      "data-flags" => post.status_flags,
      "data-parent-id" => post.parent_id,
      "data-has-children" => post.has_children?,
      "data-score" => post.score,
      "data-views" => post.view_count,
      "data-fav-count" => post.fav_count,
      "data-pixiv-id" => post.pixiv_id,
      "data-file-ext" => post.file_ext,
      "data-source" => post.source,
      "data-top-tagger" => post.keeper_id,
      "data-uploader-id" => post.uploader_id,
      "data-normalized-source" => post.normalized_source,
      "data-is-favorited" => post.favorited_by?(CurrentUser.user.id)
    }

    if CurrentUser.is_moderator?
      attributes["data-uploader"] = post.uploader_name
    end

    if post.visible?
      attributes["data-md5"] = post.md5
      attributes["data-file-url"] = post.file_url
      attributes["data-large-file-url"] = post.large_file_url
      attributes["data-preview-file-url"] = post.preview_file_url
    end

    attributes
  end

  def initialize(post)
    @post = post
  end

  def tag_set_presenter
    @tag_set_presenter ||= TagSetPresenter.new(@post.tag_array)
  end

  def preview_html
    PostPresenter.preview(@post)
  end

  def humanized_tag_string
    @post.tag_string.split(/ /).slice(0, 25).join(", ").tr("_", " ")
  end

  def humanized_essential_tag_string
    @humanized_essential_tag_string ||= tag_set_presenter.humanized_essential_tag_string(default: "##{@post.id}")
  end

  def filename_for_download
    "#{humanized_essential_tag_string} - #{@post.md5}.#{@post.file_ext}"
  end

  def safe_mode_message(template)
    html = ["This image is unavailable on safe mode (#{Danbooru.config.app_name}). Go to "]
    html << template.link_to("Danbooru", "https://danbooru.donmai.us") # XXX don't hardcode.
    html << " or disable safe mode to view ("
    html << template.link_to("learn more", template.wiki_pages_path(title: "help:user_settings"))
    html << ")."
    html.join.html_safe
  end

  def image_html(template)
    return template.content_tag("p", "The artist requested removal of this image") if @post.banblocked?
    return template.content_tag("p", template.link_to("You need a gold account to see this image.", template.new_user_upgrade_path)) if @post.levelblocked?
    return template.content_tag("p", safe_mode_message(template)) if @post.safeblocked?

    if @post.is_flash?
      template.render("posts/partials/show/flash", :post => @post)
    elsif @post.is_video?
      template.render("posts/partials/show/video", :post => @post)
    elsif @post.is_ugoira?
      template.render("posts/partials/show/ugoira", :post => @post)      
    elsif !@post.is_image?
      template.render("posts/partials/show/download", :post => @post)
    elsif @post.is_image?
      template.render("posts/partials/show/image", :post => @post)
    end
  end

  def has_nav_links?(template)
    has_sequential_navigation?(template.params) || @post.pools.undeleted.any? || @post.favorite_groups(active_id=template.params[:favgroup_id]).any?
  end

  def has_sequential_navigation?(params)
    return false if Tag.has_metatag?(params[:q], :order, :ordfav, :ordpool)
    return false if params[:pool_id].present? || params[:favgroup_id].present?
    return CurrentUser.user.enable_sequential_post_navigation 
  end

  def post_footer_for_pool_html(template)
    if template.params[:pool_id]
      pool = Pool.where(:id => template.params[:pool_id]).first
      return if pool.nil?
      return if pool.neighbors(@post).next.nil?
      template.link_to("Next in #{pool.pretty_name}", template.post_path(pool.neighbors(@post).next))
    else
      nil
    end
  end

  def pool_html(template)
    html = ["<ul>"]

    if template.params[:pool_id].present? && @post.belongs_to_pool_with_id?(template.params[:pool_id])
      pool = Pool.where(:id => template.params[:pool_id]).first
      return if pool.nil?
      html += pool_link_html(template, pool, :include_rel => true)

      other_pools = @post.pools.undeleted.where("id <> ?", template.params[:pool_id]).series_first
      other_pools.each do |other_pool|
        html += pool_link_html(template, other_pool)
      end
    else
      first = true
      pools = @post.pools.undeleted
      pools.each do |pool|
        if first && template.params[:q].blank? && template.params[:favgroup_id].blank?
          html += pool_link_html(template, pool, :include_rel => true)
          first = false
        else
          html += pool_link_html(template, pool)
        end
      end
    end

    html << "</ul>"
    html.join("\n").html_safe
  end

  def pool_link_html(template, pool, options = {})
    pool_html = [%{<li id="nav-link-for-pool-#{pool.id}" class="pool-category-#{pool.category}">}]
    match_found = false

    if options[:include_rel]
      prev_rel = "prev"
      next_rel = "next"
      klass = "active"
    else
      prev_rel = nil
      next_rel = nil
      klass = ""
    end

    if @post.id != pool.post_id_array.first
      pool_html << template.link_to("&laquo;".html_safe, template.post_path(pool.post_id_array.first, :pool_id => pool.id), :class => "#{klass} first", :title => "to page 1")
    else
      pool_html << '<span class="first">&laquo;</span>'
    end

    if pool.neighbors(@post).previous
      pool_html << template.link_to("&lsaquo;&thinsp;prev".html_safe, template.post_path(pool.neighbors(@post).previous, :pool_id => pool.id), :rel => prev_rel, :class => "#{klass} prev", :title => "to page #{pool.page_number(pool.neighbors(@post).previous)}")
      match_found = true
    else
      pool_html << '<span class="prev">&lsaquo;&thinsp;prev</span>'
    end

    pool_html << ' <span class="pool-name ' + klass + '">'
    pool_html << template.link_to("Pool: #{pool.pretty_name}", template.pool_path(pool), :title => "page #{pool.page_number(@post.id)}/#{pool.post_count}")
    pool_html << '</span> '

    if pool.neighbors(@post).next
      @next_post_in_pool = pool.neighbors(@post).next
      pool_html << template.link_to("next&thinsp;&rsaquo;".html_safe, template.post_path(@next_post_in_pool, :pool_id => pool.id), :rel => next_rel, :class => "#{klass} next", :title => "to page #{pool.page_number(@next_post_in_pool)}")
      match_found = true
    else
      pool_html << '<span class="next">next&thinsp;&rsaquo;</span>'
    end

    if @post.id != pool.post_id_array.last
      pool_html << template.link_to("&raquo;".html_safe, template.post_path(pool.post_id_array.last, :pool_id => pool.id), :class => "#{klass} last", :title => "to page #{pool.post_count}")
    else
      pool_html << '<span class="last">&raquo;</span>'
    end

    pool_html << "</li>"
    pool_html
  end
end