class Chronic::RepeaterMinute < Chronic::Repeater #:nodoc:
  MINUTE_SECONDS = 60

  def initialize(type)
    super
    @current_minute_start = nil
  end

  def next(pointer = :future)
    super

    if !@current_minute_start
      case pointer
      when :future
        @current_minute_start = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min + 1)
      when :past
        @current_minute_start = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min - 1)
      end
    else
      direction = pointer == :future ? 1 : -1
      @current_minute_start += direction * MINUTE_SECONDS
    end

    Chronic::Span.new(@current_minute_start, @current_minute_start + MINUTE_SECONDS)
  end

  def this(pointer = :future)
    super

    case pointer
    when :future
      minute_begin = @now
      minute_end = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min)
    when :past
      minute_begin = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min)
      minute_end = @now
    when :none
      minute_begin = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min)
      minute_end = Time.construct(@now.year, @now.month, @now.day, @now.hour, @now.min) + MINUTE_SECONDS
    end

    Chronic::Span.new(minute_begin, minute_end)
  end

  def offset(span, amount, pointer)
    direction = pointer == :future ? 1 : -1
    span + direction * amount * MINUTE_SECONDS
  end

  def width
    MINUTE_SECONDS
  end

  def to_s
    super << '-minute'
  end
end