module Kuroko2
  module Workflow
    module Task
      class TimeBase < Base
        class << self
          attr_reader :task_name

          def set_task_name(task_name)
            @task_name = task_name
          end
        end

        def execute
          if option.present?
            validate
            token.context[self.class.task_name] = to_minutes(option)
          end

          :next
        end

        def validate
          unless /\A\d+(?:h|m)?\z/ === option
            raise Workflow::AssertionError,
              "A value of #{self.class.task_name} should be a number."
          end
        end

        private

        def to_minutes(option)
          case option
          when /\A(\d+)h\z/
            $1.to_i * 60
          when /\A(\d+)m\z/
            $1.to_i
          else
            option.to_i
          end
        end
      end
    end
  end
end