defmodule Feedex.Helpers.Sanitizers.HTML do
  @moduledoc false

  import HtmlSanitizeEx.Scrubber.Meta
  # alias HtmlSanitizeEx.Scrubber.Meta

  @valid_schemes ["http", "https"]

  # Removes any CDATA tags before the traverser/scrubber runs.
  remove_cdata_sections_before_scrub()

  strip_comments()

  allow_tag_with_uri_attributes   "a", ["href"], @valid_schemes
  allow_tag_with_these_attributes "a", ["name", "title"]

  allow_tag_with_these_attributes "b", []
  allow_tag_with_these_attributes "blockquote", []
  allow_tag_with_these_attributes "br", []
  allow_tag_with_these_attributes "code", []
  allow_tag_with_these_attributes "del", []
  allow_tag_with_these_attributes "em", []
  allow_tag_with_these_attributes "h1", []
  allow_tag_with_these_attributes "h2", []
  allow_tag_with_these_attributes "h3", []
  allow_tag_with_these_attributes "h4", []
  allow_tag_with_these_attributes "h5", []
  allow_tag_with_these_attributes "hr", []
  allow_tag_with_these_attributes "i", []

  allow_tag_with_uri_attributes   "img", ["src"], @valid_schemes
  allow_tag_with_these_attributes "img", []

  allow_tag_with_these_attributes "li", []
  allow_tag_with_these_attributes "ol", []
  allow_tag_with_these_attributes "p", []
  allow_tag_with_these_attributes "pre", []
  allow_tag_with_these_attributes "span", []
  allow_tag_with_these_attributes "strong", []
  allow_tag_with_these_attributes "table", []
  allow_tag_with_these_attributes "tbody", []
  allow_tag_with_these_attributes "td", []
  allow_tag_with_these_attributes "th", []
  allow_tag_with_these_attributes "thead", []
  allow_tag_with_these_attributes "tr", []
  allow_tag_with_these_attributes "u", []
  allow_tag_with_these_attributes "ul", []

  allow_tag_with_uri_attributes   "video", ["src"], @valid_schemes
  allow_tag_with_these_attributes "video", ["lang", "title", "translate", "poster", "preload", "muted", "controls", "width", "height"]

  allow_tag_with_uri_attributes   "source", ["src"], @valid_schemes
  allow_tag_with_these_attributes "source", ["lang", "title", "translate", "type", "media"]

  allow_tag_with_these_attributes "iframe", ["frameborder", "webkitAllowFullScreen", "mozallowfullscreen", "allowFullScreen", "width", "height"]
  def scrub_attribute("iframe", {"src", uri}) do
    valid_schema = if String.match?(uri, @protocol_separator) do
      case Regex.run(@scheme_capture, uri) do
        [_, scheme, _] ->
          Enum.any?(@valid_schemes, fn x -> x == scheme end)
        nil ->
          false
      end
    else
      true
    end
    if valid_schema && String.match?(uri, ~r/http.?:\/\/(www\.)?youtu(be\.com|\.be)\/embed/mi), do: {"src", uri}
  end

  strip_everything_not_covered()
end