require_dependency 'inline_oneboxer'

module PrettyText
  module Helpers
    extend self

    # functions here are available to v8
    def t(key, opts)
      key = "js." + key
      unless opts
        I18n.t(key)
      else
        str = I18n.t(key, Hash[opts.entries].symbolize_keys).dup
        opts.each { |k, v| str.gsub!("{{#{k.to_s}}}", v.to_s) }
        str
      end
    end

    def avatar_template(username)
      return "" unless username
      user = User.find_by(username_lower: username.downcase)
      return "" unless user.present?

      # TODO: Add support for ES6 and call `avatar-template` directly
      UrlHelper.schemaless(UrlHelper.absolute(user.avatar_template))
    end

    def lookup_primary_user_group(username)
      return "" unless username
      user = User.find_by(username_lower: username.downcase)
      return "" unless user.present?

      user.primary_group.try(:name) || ""
    end

    # Overwrite this in a plugin to change how markdown can format
    # usernames on the server side
    def format_username(username)
      username
    end

    def mention_lookup(name)
      return false   if name.blank?
      return "group" if Group.exists?(name: name)
      return "user"  if User.exists?(username_lower: name.downcase)
    end

    def category_hashtag_lookup(category_slug)
      if category = Category.query_from_hashtag_slug(category_slug)
        [category.url_with_id, category_slug]
      else
        nil
      end
    end

    def lookup_image_urls(urls)
      map = {}
      result = {}

      urls.each do |url|
        sha1 = Upload.sha1_from_short_url(url)
        map[url] = sha1 if sha1
      end

      if map.length > 0
        reverse_map = map.invert

        Upload.where(sha1: map.values).pluck(:sha1, :url).each do |row|
          sha1, url = row

          if short_url = reverse_map[sha1]
            result[short_url] = url
          end
        end
      end

      result
    end

    def lookup_inline_onebox(url)
      InlineOneboxer.lookup(url)
    end

    def get_topic_info(topic_id)
      return unless topic_id.is_a?(Integer)
      # TODO this only handles public topics, secured one do not get this
      topic = Topic.find_by(id: topic_id)
      if topic && Guardian.new.can_see?(topic)
        {
          title: Rack::Utils.escape_html(topic.title),
          href: topic.url
        }
      end
    end

    def category_tag_hashtag_lookup(text)
      tag_postfix = '::tag'
      is_tag = text =~ /#{tag_postfix}$/

      if !is_tag && category = Category.query_from_hashtag_slug(text)
        [category.url_with_id, text]
      elsif (!is_tag && tag = Tag.find_by(name: text)) ||
            (is_tag && tag = Tag.find_by(name: text.gsub!("#{tag_postfix}", '')))
        ["#{Discourse.base_url}/tags/#{tag.name}", text]
      else
        nil
      end
    end

    def get_current_user(user_id)
      return unless user_id.is_a?(Integer)
      { staff: User.where(id: user_id).where("moderator OR admin").exists? }
    end
  end
end