module RGeoServer
  # A style describes how a resource (feature type or coverage) should be symbolized or rendered by a Web Map Service. In GeoServer styles are specified with {SLD}[http://docr.geoserver.org/stable/en/user/styling/index.html#styling]
  class Style < ResourceInfo

    OBJ_ATTRIBUTES = {:catalog => 'catalog', :name => 'name', :sld_version => 'sldVersion', :filename => 'filename', :sld_doc => 'sld_doc' }
    OBJ_DEFAULT_ATTRIBUTES = {:catalog => nil, :name => nil, :sld_version => nil, :filename => '', :sld_doc => nil }

    define_attribute_methods OBJ_ATTRIBUTES.keys
    update_attribute_accessors OBJ_ATTRIBUTES

    @@route = "styles"
    @@resource_name = "style"
    @@sld_namespace = "http://www.opengis.net/sld"

    def self.resource_name
      @@resource_name
    end

    def self.root_xpath
      "//#{@@route}/#{@@resource_name}"
    end

    def self.member_xpath
      "//#{resource_name}"
    end

    def route
      @@route  
    end

    def sld_namespace
      @@sld_namespace
    end

 
    def create_options
      {
        :headers => {
          :accept => :xml,
          :content_type=> "application/vnd.ogc.sld+xml"
        },
        :format => :xml,
        :name => @name
      }
    end   
    
    def update_options
      {
        :headers => {
          :accept => :xml,
          :content_type=> "application/vnd.ogc.sld+xml"
        },
        :format => :sld
      }
    end

    def message
      @sld_doc
    end

    # @param [RGeoServer::Catalog] catalog
    # @param [Hash] options
    def initialize catalog, options
      super(catalog)
      _run_initialize_callbacks do
        @name = options[:name].strip
      end        
      @route = route
    end

    # Obtain all layers that use this style.
    # WARNING: This will be slow and inneficient when the list of all layers is too long.
    def layers &block
      return to_enum(:layers).to_a unless block_given?
      @catalog.get_layers do |l|
        lyrs = [l.profile['default_style']]+l.profile['alternate_styles']
        yield l if lyrs.include? @name
      end 
    end

    def profile_xml_to_hash profile_xml
      doc = profile_xml_to_ng profile_xml
      h = {
        'name' => doc.at_xpath('//name').text.strip, 
        'sld_version' => doc.at_xpath('//sldVersion/version/text()').to_s,
        'filename' => doc.at_xpath('//filename/text()').to_s,
        'sld_doc' => begin
          Nokogiri::XML(@catalog.search({:styles => @name}, options={:format => :sld})).to_xml
        rescue RestClient::ResourceNotFound
          nil 
        end
      }.freeze 
      h 
    end

  end
end