# coding: utf-8

module LazyHighCharts
  module LayoutHelper

    def high_chart(placeholder, object  , &block)
      object.html_options.merge!({:id=>placeholder})
      object.options[:chart][:renderTo] = placeholder
      high_graph(placeholder,object , &block).concat(content_tag("div","", object.html_options))
    end

    def high_stock(placeholder, object  , &block)
      object.html_options.merge!({:id=>placeholder})
      object.options[:chart][:renderTo] = placeholder
      high_graph_stock(placeholder,object , &block).concat(content_tag("div","", object.html_options))
    end

    def high_graph(placeholder, object, &block)
      build_html_output("Chart", placeholder, object, &block)
    end

    def high_graph_stock(placeholder, object, &block)
      build_html_output("StockChart", placeholder, object, &block)
    end

    def build_html_output(type, placeholder, object, &block)
      options_collection =  [ generate_json_from_hash(OptionsKeyFilter.filter(object.options)) ]
      options_collection << %|"series": [#{generate_json_from_array(object.data)}]|

      core_js =<<-EOJS
        var options, chart;
        options = { #{options_collection.join(',')} };
        #{capture(&block) if block_given?}
        chart = new Highcharts.#{type}(options);
      EOJS

      if defined?(request) && request.respond_to?(:xhr?) && request.xhr?
        graph =<<-EOJS
        <script type="text/javascript">
        (function() {
          #{core_js}
        })()
        </script>
        EOJS
      else
        graph =<<-EOJS
        <script type="text/javascript">
        (function() {
          var onload = window.onload;
          window.onload = function(){
            if (typeof onload == "function") onload();
            #{core_js}
          };
        })()
        </script>
        EOJS
      end

      if defined?(raw)
        return raw(graph) 
      else
        return graph
      end

    end
    
    private

    def generate_json_from_hash hash
      hash.each_pair.map do |key, value|
        k = key.to_s.camelize.gsub!(/\b\w/) { $&.downcase }
        %|"#{k}": #{generate_json_from_value value}|
      end.flatten.join(',')
    end

    def generate_json_from_value value
      if value.is_a? Hash
        %|{ #{generate_json_from_hash value} }|
      elsif value.is_a? Array
        %|[ #{generate_json_from_array value} ]|
      elsif value.respond_to?(:js_code) && value.js_code?
        value
      else
        value.to_json
      end
    end

    def generate_json_from_array array
      array.map{|value| generate_json_from_value(value)}.join(",")
    end
    
  end
end

ActionView::Base.send :include, LazyHighCharts::LayoutHelper