class SidekiqUniqueJobs::VersionCheck

def self.satisfied?(version, constraint)
  new(version, constraint).satisfied?
end

def self.unfulfilled?(version, constraint)
  !satisfied?(version, constraint)
end

def compare(expected, operator)
  Gem::Version.new(version).send(operator, Gem::Version.new(expected))
end

def constraints
  result = { version_one => operator_one }
  result[version_two] = operator_two if version_two
  result
end

def initialize(version, constraint)
  @version   = Gem::Version.new(version)
  @match     = PATTERN.match(constraint.to_s)
  raise ArgumentError, "A version (eg. 5.0) is required to compare against" unless @version
  raise ArgumentError, "At least one operator and version is required (eg. >= 5.1)" unless constraint
end

def operator_one
  match[:operator1]
end

def operator_two
  match[:operator2]
end

def satisfied?
  constraints.all? do |expected, operator|
    compare(expected, operator)
  end
end

def version_one
  match[:version1]
end

def version_two
  match[:version2]
end