lucasmartins/igs_pie_chart

module Igs
  module Pie
    class Chart
      attr_reader :title,:size,:endomargin,:target_element,:data
      # data=[100,299,234,55]
      def initialize(title,size,endomargin=0,target_element='body',data)
        @title = title
        @size = size
        @endomargin = endomargin
        @data = data.values
        @labels = data.keys
        @target_element = target_element
        @default_attribution=false
      end

      def script
        return eval_erb('script.html')
      end

      def style
        return eval_erb('style.css')
      end

      def labels
        return eval_erb('labels.html')
      end

      def render
        rendering = "<style>\n"
        rendering+= self.style
        rendering+= "</style>\n"
        rendering+= self.script
        rendering+= self.labels
        
        return rendering
      end

      def to_s
        render
      end

      def data=(data)
        @data=data
      end

      def width=(width)
        @width = width
      end

      def height=(height)
        @height = height
      end

    private
      
      def eval_erb(partial)
        begin
          default_attributions

          path = File.expand_path("../../../templates/_#{partial}.erb", __FILE__)
          output = ERB.new(File.read(path)).result(binding)
        rescue Exception => e
          STDERR.puts "Erro ao renderizar '#{partial}'! #{e}"
          output = nil
        end
        return output
      end

      def default_attributions

        if @default_attribution == true
          return
        end

        @default_attribution=true
        #Default value attribution
        dsize = 300
        @width = dsize if @width == nil
        @height = dsize if @height == nil
        @endomargin = 0 if @endomargin == nil
        @width = @height = @size if @size!=nil
        
        if @data==nil
          @data=[1,1,1]
        end

        if @endomargin >= 1
          @endomargin = 0
          STDERR.puts "@endomargin must be less than 1"
        end
      end

    end
  end
end