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

    def initialize(type, width = nil, options = {})
      super
      @current_minute_start = nil
    end

    def next(pointer = :future)
      super

      unless @current_minute_start
        case pointer
        when :future
          @current_minute_start = Chronic.construct(@now.year, @now.month, @now.day, @now.hour, @now.min + 1)
        when :past
          @current_minute_start = Chronic.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

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

      Span.new(minute_begin, minute_end)
    end

    def offset(span, amount, pointer)
      return nil unless span

      direction = pointer == :future ? 1 : -1
      span + direction * amount * MINUTE_SECONDS
    end

    def width
      MINUTE_SECONDS
    end

    def to_s
      super << '-minute'
    end
  end
end
