posts: refactor post previews to use ViewComponent.

Refactor the post preview html to use the ViewComponent framework. This
lets us encapsulate all the HTML, CSS, and helper methods for a UI
component in a single place.

See https://viewcomponent.org.

app/presenters/post_presenter.rb

@@ -2,147 +2,6 @@ class PostPresenter
   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, show_deleted: false, tags: "", **options)
-    if post.nil?
-      return "<em>none</em>".html_safe
-    end
-
-    if post.is_deleted? && !show_deleted
-      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[:post] = post
-
-    locals[:article_attrs] = {
-      "id" => "post_#{post.id}",
-      "class" => preview_class(post, **options).join(" ")
-    }.merge(data_attributes(post))
-
-    locals[:link_target] = options[:link_target] || post
-
-    locals[:link_params] = {}
-    if tags.present? && !CurrentUser.is_anonymous?
-      locals[:link_params]["q"] = tags
-    end
-    if options[:pool_id]
-      locals[:link_params]["pool_id"] = options[:pool_id]
-    end
-    if options[:favgroup_id]
-      locals[:link_params]["favgroup_id"] = options[:favgroup_id]
-    end
-
-    locals[:tooltip] = "#{post.tag_string} rating:#{post.rating} score:#{post.score}"
-
-    locals[:cropped_url] = if 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 ##{post.id}"
-
-    locals[:has_cropped] = post.has_cropped?
-
-    if options[:pool]
-      locals[:pool] = options[:pool]
-    else
-      locals[:pool] = nil
-    end
-
-    locals[:width] = post.image_width
-    locals[:height] = post.image_height
-
-    # XXX work around ancient bad posts with null or zero dimensions.
-    if post.image_width.to_i > 0 && post.image_height.to_i > 0
-      downscale_ratio = Danbooru.config.small_image_width.to_f / [post.image_width, post.image_height].max
-      locals[:preview_width] = [(downscale_ratio * post.image_width).floor, post.image_width].min
-      locals[:preview_height] = [(downscale_ratio * post.image_height).floor, post.image_height].min
-    else
-      locals[:preview_width] = 0
-      locals[:preview_height] = 0
-    end
-
-    if options[:similarity]
-      locals[:similarity] = options[:similarity].round(1)
-    else
-      locals[:similarity] = nil
-    end
-
-    if options[:size]
-      locals[:size] = post.file_size
-    else
-      locals[:size] = nil
-    end
-
-    if options[:recommended]
-      locals[:recommended] = options[:recommended].round(1)
-    else
-      locals[:recommended] = nil
-    end
-
-    ApplicationController.render(partial: "posts/partials/index/preview", locals: locals)
-  end
-
-  def self.preview_class(post, pool: nil, size: nil, similarity: nil, recommended: nil, compact: nil, **options)
-    klass = ["post-preview"]
-    # klass << " large-cropped" if post.has_cropped? && options[:show_cropped]
-    klass << "captioned" if pool || size || similarity || recommended
-    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 << "post-preview-compact" if compact
-    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-large-width" => post.large_image_width,
-      "data-large-height" => post.large_image_height,
-      "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-uploader-id" => post.uploader_id,
-      "data-normalized-source" => post.normalized_source,
-    }
-
-    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