#--
# Copyright (C) 2006 Dimitrij Denissenko
# Please read LICENSE document for more information.
#++
class TimeInterval      
  attr_reader :in_seconds

  UNITS = %w{year month week day hour minute}          
      
  def initialize(interval_in_seconds)
    @in_seconds = interval_in_seconds
  end

  def self.match(seconds, count_range)
    diff = nil
    UNITS.reverse.each do |u|      
      max_seconds_per_unit = in_seconds(count_range.last, u)
      if max_seconds_per_unit > seconds
        count_range.each do |c|
          seconds_per_unit = in_seconds(c, u)
          if seconds_per_unit > seconds
            return [c-1, Inflector.pluralize(u)]                
          end
        end
      end
    end
    return [60, 'years']    
  end

  def self.in_seconds(count, unit)
    eval("#{count}." + Inflector.pluralize(unit))
  end

  def humanize
    c = count.round.abs
    u = c > 1 ? units : unit
    
    count > 0 ? "in #{c} #{u}" : "#{c} #{u} ago"
  end          

  def count
    to_a[0]
  end
        
  def unit
    to_a[1]
  end
    
  def units
    Inflector.pluralize(unit)
  end

  def to_a
    UNITS.each do |u|
      seconds_per_unit = eval("1." + Inflector.pluralize(u))
      return [(in_seconds.to_f / seconds_per_unit), u] if in_seconds.abs > seconds_per_unit
    end
    return [1, 'minute']
  end          
  
end