defmodule Feedraptor.Parser.ItunesRSS do
  @moduledoc """
  Feed Parser for Itunes RSS feeds

  ## Feed properties:

  * Copyright
  * Description
  * Image
  * Language
  * Last Built
  * Url
  * Managing Editor
  * Version
  * Title
  * TTL
  * Itunes Author
  * Itunes Block
  * Itunes Image
  * Itunes Explicit
  * Itunes Complete
  * Itunes Keywords
  * Itunes Type
  * Itunes new feed url
  * Itunes Subtitle
  * Itunes Categories
  * Itunes Owners
  * Entries

  ## Owner Properties

  * Name
  * Email

  ## Entry properties:

  * Author
  * Guid
  * Title
  * Url
  * Summary
  * Content
  * Published
  * Itunes Author
  * Itunes Block
  * Itunes Duration
  * Itunes Explicit
  * Itunes Keywords
  * Itunes Subtitle
  * Itunes Image
  * Itunes Closed Captioned
  * Itunes Order
  * Itunes Season
  * Itunes Episode
  * Itunes Title
  * Itunes Episode Type
  * Itunes Summary
  * Enclosure Length
  * Enclosure Type
  * Enclosure Url

  ## Image properties:

  * Url
  * Title
  * Link
  * Width
  * Height
  * Description
  """
  use Capuli

  # RSS 2.0 elements that need including
  element :copyright
  element :description
  element :image, module: Feedraptor.Parser.RSSImage
  element :language
  element :lastbuilddate, as: :last_built
  element :link, as: :url
  element :managingeditor
  element :rss, as: :version, value: :version
  element :title
  element :ttl

  # If author is not present use managingEditor on the channel
  element :"itunes:author", as: :itunes_author
  element :"itunes:block", as: :itunes_block
  element :"itunes:image", value: :href, as: :itunes_image
  element :"itunes:explicit", as: :itunes_explicit
  element :"itunes:complete", as: :itunes_complete
  element :"itunes:keywords", as: :itunes_keywords
  element :"itunes:type", as: :itunes_type

  # New URL for the podcast feed
  element :"itunes:new_feed_url", as: :itunes_new_feed_url
  element :"itunes:subtitle", as: :itunes_subtitle

  # If summary is not present, use the description tag
  element :"itunes:summary", as: :itunes_summary

  # iTunes RSS feeds can have multiple main categories and multiple
  # sub-categories per category.
  #elements :"itunes:category", as: :_itunes_categories, module: Feedraptor.Parser.ItunesRSS.Category
  elements :"itunes:category", as: :itunes_categories, value: :text

  elements :"itunes:owner", as: :itunes_owners, class: Feedraptor.Parser.ItunesRSS.Owner
  elements :item, as: :entries, module: Feedraptor.Parser.ItunesRSS.Item

  defmodule Owner do
    @moduledoc false
    use Capuli

    element :"itunes:name", as: :name
    element :"itunes:email", as: :email
  end

  defmodule Item do
    @moduledoc false
    alias Feedraptor.Helper

    defmodule Definition do
      @moduledoc false
      use Capuli

      element :author
      element :guid, as: :entry_id
      element :title
      element :link, as: :url
      element :description, as: :summary
      element :"content:encoded", as: :content
      element :pubdate, as: :published

      # If author is not present use author tag on the item
      element :"itunes:author", as: :itunes_author
      element :"itunes:block", as: :itunes_block
      element :"itunes:duration", as: :itunes_duration
      element :"itunes:explicit", as: :itunes_explicit
      element :"itunes:keywords", as: :itunes_keywords
      element :"itunes:subtitle", as: :itunes_subtitle
      element :"itunes:image", value: :href, as: :itunes_image
      element :"itunes:isclosedcaptioned", as: :itunes_closed_captioned
      element :"itunes:order", as: :itunes_order
      element :"itunes:season", as: :itunes_season
      element :"itunes:episode", as: :itunes_episode
      element :"itunes:title", as: :itunes_title
      element :"itunes:episodetype", as: :itunes_episode_type

      # If summary is not present, use the description tag
      element :"itunes:summary", as: :itunes_summary
      element :enclosure, value: :length, as: :enclosure_length
      element :enclosure, value: :type, as: :enclosure_type
      element :enclosure, value: :url, as: :enclosure_url
      #elements "psc:chapter", as: :raw_chapters, class: Feedjira::Parser::PodloveChapter
    end

    @doc false
    def parse(raw_entry) do
      raw_entry
      |> Definition.parse()
      |> Helper.update_date_fields()
    end
  end

  @doc false
  def will_parse?(xml) do
    xml =~ ~r{xmlns:itunes\s?=\s?[\"\']http://www\.itunes\.com/dtds/podcast-1\.0\.dtd[\"\']}
  end
end