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module Acceptance
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  ###
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  # A utility class which can be used in conjunction with Timeout mechanisms
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  ###
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  class Countdown
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    # @param [int] timeout The time in seconds that this count starts from
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    def initialize(timeout)
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      @start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC, :second)
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      @end_time = @start_time + timeout
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      @timeout = timeout
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    end
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    # @return [TrueClass, FalseClass] True if the timeout has surpassed, false otherwise
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    def elapsed?
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      remaining_time == 0
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    end
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    # @return [Integer] The time in seconds left before this countdown expires
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    def remaining_time
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      [@end_time - Process.clock_gettime(Process::CLOCK_MONOTONIC, :second), 0].max
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    end
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  end
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end
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