Contents

class Dolarblue
  module InstanceMethods

    # Create a new Dolarblue instance to work later on
    #
    # @param [Configuration] config the configuration instance
    #
    # @return [Dolarblue] new instance
    def initialize(config = Configuration.instance)
      fail ArgumentError, "Expected a Dolarblue::Configuration instance as argument" unless config.is_a?(Configuration)
      @blue = Dolarblue::Exchange.new('Blue', config.blue_screen_name, config.blue_regexp, config.buy_sell_factor)
      @official = Dolarblue::Exchange.new('Official', config.official_screen_name, config.official_regexp, config.buy_sell_factor)
      self
    end

    # Returns current object state, whether valid or not
    #
    # @return [true, false] boolean state
    def valid?
      @blue.valid? && @official.valid?
    end

    # Connect to the source and retrieve dollar exchange values
    #
    # @return [self]
    def update!
      print "Obtaining latest AR$ vs US$ exchange values..."
      @blue.update!
      @official.update!
      print "Done.\n\n"
      self
    end

    # Returns the gap between the real (blue) dollar value versus the official
    #
    # @return [Float] percentile value between 0..1
    def gap
      fail "Need blue and official values to be setup before calculating the gap" unless @blue.sell_value && @blue.sell_value > 0 && @official.sell_value && @official.sell_value > 0
      (@blue.sell_value / @official.sell_value - 1)
    end

    # Returns the gap percentile between the real (blue) dollar value versus the official
    #
    # @return [Float] percentile value between 0..100
    def gap_percent
      (gap * 100).round(0)
    end

    # Output string to be used by the binary `dolarblue`
    #
    # @return [String] the output with dollar exchange information
    def output
      <<-OUTPUT
#{@official.output_values}
#{@blue.output_values}
- Gap.....: #{gap_percent}%

Information sources:
#{@official.output_link}
#{@blue.output_link}
      OUTPUT
    end

  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
dolarblue-0.1.0	lib/dolarblue/instance_methods.rb