module Locomotive
  module Steam
    module Liquid
      module Filters
        module Html

          # Return a link tag that browsers and news readers can use to auto-detect an RSS or ATOM feed.
          # input: url of the feed
          # example:
          #   {{ '/foo/bar' | auto_discovery_link_tag: 'rel:alternate', 'type:application/atom+xml', 'title:A title' }}
          def auto_discovery_link_tag(input, *args)
            options = args_to_options(args)

            rel   = options[:rel] || 'alternate'
            type  = options[:type] || 'application/rss+xml'
            title = options[:title] || 'RSS'

            %{<link rel="#{rel}" type="#{type}" title="#{title}" href="#{input}" />}
          end

          # Write the url of a theme stylesheet
          # input: name of the css file
          def stylesheet_url(input)
            css_js_asset_url(input, '.css', 'stylesheets')
          end

          # Write the link tag of a theme stylesheet
          # input: url of the css file
          def stylesheet_tag(input, media = 'screen')
            return '' if input.nil?

            input = stylesheet_url(input)

            %{<link href="#{input}" media="#{media}" rel="stylesheet" type="text/css" />}
          end

          # Write the url to javascript resource
          # input: name of the javascript file
          def javascript_url(input)
            css_js_asset_url(input, '.js', 'javascripts')
          end

          # Write the link to javascript resource
          # input: url of the javascript file
          def javascript_tag(input, *args)
            return '' if input.nil?

            javascript_options = inline_options(args_to_options(args))
            input = javascript_url(input)

            %{<script src="#{input}" type="text/javascript" #{javascript_options}></script>}
          end

          def theme_image_url(input)
            return '' if input.nil?

            input = "images/#{input}" unless input.starts_with?('/')

            asset_url(input)
          end

          # Write a theme image tag
          # input: name of file including folder
          # example: 'about/myphoto.jpg' | theme_image # <img src="images/about/myphoto.jpg">
          def theme_image_tag(input, *args)
            image_options = inline_options(args_to_options(args))

            %{<img src="#{theme_image_url(input)}" #{image_options}>}
          end

          # Write an image tag
          # input: url of the image OR asset drop
          def image_tag(input, *args)
            image_options = inline_options(args_to_options(args))

            %{<img src="#{get_url_from_asset(input)}" #{image_options}>}
          end

          # Embed a flash movie into a page
          # input: url of the flash movie OR asset drop
          # width: width (in pixel or in %) of the embedded movie
          # height: height (in pixel or in %) of the embedded movie
          def flash_tag(input, *args)
            path = get_url_from_asset(input)
            embed_options = inline_options(args_to_options(args))
            html = <<-EOF
<object #{embed_options}>
  <param name="movie" value="#{path}">
  <embed src="#{path}" #{embed_options}>
  </embed>
</object>
EOF
            html.gsub(/ >/, '>').strip
          end

        end

        ::Liquid::Template.register_filter(Html)

      end
    end
  end
end