module Plate
  # An asset is a CoffeeScript or Sass file that needs to be compiled before writing
  # to the destination.
  class Asset < Page
    def engines
      @engines ||= self.extensions.reverse.collect { |e| self.site.registered_asset_engines[e.gsub(/\./, '').to_sym] }.reject { |e| !e }
    end
    
    def extensions
      @extensions ||= self.basename.scan(/\.[^.]+/)
    end
    
    def format_extension
      self.extensions.reverse.detect { |e| !self.site.asset_engine_extensions.include?(e) }
    end
    
    def file_path      
      "#{directory}/#{file_name}"
    end
    
    # Same as page, but no layout applied
    def rendered_content
      return @rendered_content if @rendered_content
      
      result = File.read(file)
      
      self.engines.each do |engine|        
        template = engine.new() { result }
        result = template.render(self, :site => self.site)
      end
      
      @rendered_content = result
    end
    
    # Write this page to the destination. For static files this just results
    # in copying the file over to the destination
    def write!
      path = File.join(site.build_destination, file_path)
      
      FileUtils.mkdir_p(File.dirname(path))
      
      File.open(path, 'w') do |f|
        f.write(self.rendered_content)
      end
    end
  end
end