require "rss/parser"

module RSS

  ##
  # = RSS 0.9 support
  #
  # RSS has three different versions. This module contains support for version
  # 0.9.1[http://www.rssboard.org/rss-0-9-1-netscape].
  #
  # == Producing RSS 0.9
  #
  # Producing our own RSS feeds is easy as well. Let's make a very basic feed:
  #
  #  require "rss"
  #
  #  rss = RSS::Maker.make("0.91") do |maker|
  #    maker.channel.language = "en"
  #    maker.channel.author = "matz"
  #    maker.channel.updated = Time.now.to_s
  #    maker.channel.link = "http://www.ruby-lang.org/en/feeds/news.rss"
  #    maker.channel.title = "Example Feed"
  #    maker.channel.description = "A longer description of my feed."
  #    maker.image.url = "http://www.ruby-lang.org/images/logo.gif"
  #    maker.image.title = "An image"
  #    maker.items.new_item do |item|
  #      item.link = "http://www.ruby-lang.org/en/news/2010/12/25/ruby-1-9-2-p136-is-released/"
  #      item.title = "Ruby 1.9.2-p136 is released"
  #      item.updated = Time.now.to_s
  #    end
  #  end
  #
  #  puts rss
  #
  # As you can see, this is a very Builder-like DSL. This code will spit out an
  # RSS 0.9 feed with one item. If we needed a second item, we'd make another
  # block with maker.items.new_item and build a second one.
  module RSS09
    NSPOOL = {}
    ELEMENTS = []

    def self.append_features(klass)
      super

      klass.install_must_call_validator('', "")
    end
  end

  class Rss < Element

    include RSS09
    include RootElementMixin

    %w(channel).each do |name|
      install_have_child_element(name, "", nil)
    end

    attr_writer :feed_version
    alias_method(:rss_version, :feed_version)
    alias_method(:rss_version=, :feed_version=)

    def initialize(feed_version, version=nil, encoding=nil, standalone=nil)
      super
      @feed_type = "rss"
    end

    def items
      if @channel
        @channel.items
      else
        []
      end
    end

    def image
      if @channel
        @channel.image
      else
        nil
      end
    end

    def textinput
      if @channel
        @channel.textInput
      else
        nil
      end
    end

    def setup_maker_elements(maker)
      super
      items.each do |item|
        item.setup_maker(maker.items)
      end
      image.setup_maker(maker) if image
      textinput.setup_maker(maker) if textinput
    end

    private
    def _attrs
      [
        ["version", true, "feed_version"],
      ]
    end

    class Channel < Element

      include RSS09

      [
        ["title", nil, :text],
        ["link", nil, :text],
        ["description", nil, :text],
        ["language", nil, :text],
        ["copyright", "?", :text],
        ["managingEditor", "?", :text],
        ["webMaster", "?", :text],
        ["rating", "?", :text],
        ["pubDate", "?", :date, :rfc822],
        ["lastBuildDate", "?", :date, :rfc822],
        ["docs", "?", :text],
        ["cloud", "?", :have_attribute],
        ["skipDays", "?", :have_child],
        ["skipHours", "?", :have_child],
        ["image", nil, :have_child],
        ["item", "*", :have_children],
        ["textInput", "?", :have_child],
      ].each do |name, occurs, type, *args|
        __send__("install_#{type}_element", name, "", occurs, name, *args)
      end
      alias date pubDate
      alias date= pubDate=

      private
      def maker_target(maker)
        maker.channel
      end

      def setup_maker_elements(channel)
        super
        [
          [skipDays, "day"],
          [skipHours, "hour"],
        ].each do |skip, key|
          if skip
            skip.__send__("#{key}s").each do |val|
              target_skips = channel.__send__("skip#{key.capitalize}s")
              new_target = target_skips.__send__("new_#{key}")
              new_target.content = val.content
            end
          end
        end
      end

      def not_need_to_call_setup_maker_variables
        %w(image textInput)
      end

      class SkipDays < Element
        include RSS09

        [
          ["day", "*"]
        ].each do |name, occurs|
          install_have_children_element(name, "", occurs)
        end

        class Day < Element
          include RSS09

          content_setup

          def initialize(*args)
            if Utils.element_initialize_arguments?(args)
              super
            else
              super()
              self.content = args[0]
            end
          end

        end

      end

      class SkipHours < Element
        include RSS09

        [
          ["hour", "*"]
        ].each do |name, occurs|
          install_have_children_element(name, "", occurs)
        end

        class Hour < Element
          include RSS09

          content_setup(:integer)

          def initialize(*args)
            if Utils.element_initialize_arguments?(args)
              super
            else
              super()
              self.content = args[0]
            end
          end
        end

      end

      class Image < Element

        include RSS09

        %w(url title link).each do |name|
          install_text_element(name, "", nil)
        end
        [
          ["width", :integer],
          ["height", :integer],
          ["description"],
        ].each do |name, type|
          install_text_element(name, "", "?", name, type)
        end

        def initialize(*args)
          if Utils.element_initialize_arguments?(args)
            super
          else
            super()
            self.url = args[0]
            self.title = args[1]
            self.link = args[2]
            self.width = args[3]
            self.height = args[4]
            self.description = args[5]
          end
        end

        private
        def maker_target(maker)
          maker.image
        end
      end

      class Cloud < Element

        include RSS09

        [
          ["domain", "", true],
          ["port", "", true, :integer],
          ["path", "", true],
          ["registerProcedure", "", true],
          ["protocol", "", true],
        ].each do |name, uri, required, type|
          install_get_attribute(name, uri, required, type)
        end

        def initialize(*args)
          if Utils.element_initialize_arguments?(args)
            super
          else
            super()
            self.domain = args[0]
            self.port = args[1]
            self.path = args[2]
            self.registerProcedure = args[3]
            self.protocol = args[4]
          end
        end
      end

      class Item < Element

        include RSS09

        [
          ["title", '?', :text],
          ["link", '?', :text],
          ["description", '?', :text],
          ["category", '*', :have_children, "categories"],
          ["source", '?', :have_child],
          ["enclosure", '?', :have_child],
        ].each do |tag, occurs, type, *args|
          __send__("install_#{type}_element", tag, "", occurs, tag, *args)
        end

        private
        def maker_target(items)
          if items.respond_to?("items")
            # For backward compatibility
            items = items.items
          end
          items.new_item
        end

        def setup_maker_element(item)
          super
          @enclosure.setup_maker(item) if @enclosure
          @source.setup_maker(item) if @source
        end

        class Source < Element

          include RSS09

          [
            ["url", "", true]
          ].each do |name, uri, required|
            install_get_attribute(name, uri, required)
          end

          content_setup

          def initialize(*args)
            if Utils.element_initialize_arguments?(args)
              super
            else
              super()
              self.url = args[0]
              self.content = args[1]
            end
          end

          private
          def maker_target(item)
            item.source
          end

          def setup_maker_attributes(source)
            source.url = url
            source.content = content
          end
        end

        class Enclosure < Element

          include RSS09

          [
            ["url", "", true],
            ["length", "", true, :integer],
            ["type", "", true],
          ].each do |name, uri, required, type|
            install_get_attribute(name, uri, required, type)
          end

          def initialize(*args)
            if Utils.element_initialize_arguments?(args)
              super
            else
              super()
              self.url = args[0]
              self.length = args[1]
              self.type = args[2]
            end
          end

          private
          def maker_target(item)
            item.enclosure
          end

          def setup_maker_attributes(enclosure)
            enclosure.url = url
            enclosure.length = length
            enclosure.type = type
          end
        end

        class Category < Element

          include RSS09

          [
            ["domain", "", false]
          ].each do |name, uri, required|
            install_get_attribute(name, uri, required)
          end

          content_setup

          def initialize(*args)
            if Utils.element_initialize_arguments?(args)
              super
            else
              super()
              self.domain = args[0]
              self.content = args[1]
            end
          end

          private
          def maker_target(item)
            item.new_category
          end

          def setup_maker_attributes(category)
            category.domain = domain
            category.content = content
          end

        end

      end

      class TextInput < Element

        include RSS09

        %w(title description name link).each do |name|
          install_text_element(name, "", nil)
        end

        def initialize(*args)
          if Utils.element_initialize_arguments?(args)
            super
          else
            super()
            self.title = args[0]
            self.description = args[1]
            self.name = args[2]
            self.link = args[3]
          end
        end

        private
        def maker_target(maker)
          maker.textinput
        end
      end

    end

  end

  RSS09::ELEMENTS.each do |name|
    BaseListener.install_get_text_element("", name, name)
  end

  module ListenerMixin
    private
    def initial_start_rss(tag_name, prefix, attrs, ns)
      check_ns(tag_name, prefix, ns, "", false)

      @rss = Rss.new(attrs['version'], @version, @encoding, @standalone)
      @rss.do_validate = @do_validate
      @rss.xml_stylesheets = @xml_stylesheets
      @last_element = @rss
      pr = Proc.new do |text, tags|
        @rss.validate_for_stream(tags, @ignore_unknown_element) if @do_validate
      end
      @proc_stack.push(pr)
    end

  end

end