class Ecu
  class ValueComparison

    def initialize(left, right)
      # check_compatibility(left, right)
      @left, @right = left, right
    end

    def eql?
      return false unless @left.class == @right.class
      case @left
      when String then
        @left == @right
      when Numeric then
        @left == @right
      when Array then
        return false unless @left.size == @right.size
        @left.zip(@right).all? do |a, b|
          self.class.new(a, b).eql?
        end
      when  NilClass then
        @left == @right
      else
        fail "Unkown value class: #{@left.class}"
      end
    end

    private

    def check_compatibility(left, right)
      if left.class != right.class
        fail ArgumentError, "Values must have the same class for comparison (#{left}: #{left.class}/#{right}: #{right.class})"
      end
    end

  end
end