module NumberFormattable
  extend ActiveSupport::Concern

  def precision
    @precision ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'precision'}
    if @precision.nil?
      @print_settings ||= PrintSetting.get_precision_delimiter
      if @print_settings
        @precision = OpenStruct.new(value: @print_settings.precision.to_i)
      else
        @precision = OpenStruct.new(value: 2)
      end
    end
    @precison_value ||= @precision.value.to_i
  end

  def delimiter
    @delimiter ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'delimiter'}
    if @delimiter.nil?
      @print_settings ||= PrintSetting.get_precision_delimiter
      if @print_settings && @print_settings.delimiter
        @delimiter = OpenStruct.new(value: ",")
      else
        @delimiter = OpenStruct.new(value: "")
      end
    end
    @delimiter_value ||= @delimiter.value.to_s.gsub(/\\u(\h{4})/) { |m| [$1].pack("H*").unpack("n*").pack("U*") }
  end

  def strip_insignificant_zeros
    @strip_insignificant_zeros ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'strip_insignificant_zeros'}
    if @strip_insignificant_zeros.nil?
      @strip_insignificant_zeros = OpenStruct.new(value: false)
    end
    @strip_insignificant_zeros_value ||= ['1', 't', 'true', 'on', 'y', 'yes'].include? @strip_insignificant_zeros.value.to_s
  end

	def number_format(number, options = {})
		options[:precision] = options[:precision] || precision
		# options[:delimiter] = options[:delimiter] || delimiter
		options[:strip_insignificant_zeros] = options[:strip_insignificant_zeros] || strip_insignificant_zeros
    
		if options[:precision] > 0
			if options[:strip_insignificant_zeros]
				formatted = "%.12g" % number.round(options[:precision])
			else
				formatted = "%.#{options[:precision]}f" % number.round(options[:precision])
			end
		else
			formatted = number.round(options[:precision]).to_i.to_s
		end

		if options[:delimiter] && !options[:delimiter].empty?
			formatted = formatted.gsub(/(\d)(?=\d{3}+(\.\d*)?$)/, "\\1#{options[:delimiter]}")
		end

		return formatted
	end

end