module Runt

# File lib/runt/sugar.rb, line 122
def const(string)
  self.const_get(string.capitalize)
end

# File lib/runt.rb, line 60
def day_name(number)
  Date::DAYNAMES[number]
end

# File lib/runt.rb, line 72
def format_date(date)
  date.ctime
end

# File lib/runt.rb, line 68
def format_time(date)
  date.strftime('%I:%M%p')
end

# File lib/runt.rb, line 64
def month_name(number)
  Date::MONTHNAMES[number]
end

# File lib/runt.rb, line 79
def ordinalize(number)
  if (number.to_i==-1)
    'last'
  elsif (number.to_i==-2)
    'second to last'  
  elsif (11..13).include?(number.to_i % 100)
    "#{number}th"
  else
    case number.to_i % 10
      when 1: "#{number}st"
      when 2: "#{number}nd"
      when 3: "#{number}rd"
      else    "#{number}th"
    end
  end
end

# File lib/runt/sugar.rb, line 133
def build(name, *args, &block)
  case name.to_s
  when /^daily_(\d{1,2})_(\d{2})([ap]m)_to_(\d{1,2})_(\d{2})([ap]m)$/
    # REDay
    st_hr, st_min, st_m, end_hr, end_min, end_m = $1, $2, $3, $4, $5, $6
    args = parse_time(st_hr, st_min, st_m)
    args.concat(parse_time(end_hr, end_min, end_m))
    return REDay.new(*args)
  when Regexp.new('^weekly_' + DAYS + '_to_' + DAYS + '$')
    # REWeek
    st_day, end_day = $1, $2
    return REWeek.new(Runt.const(st_day), Runt.const(end_day))
  when Regexp.new('^monthly_(\d{1,2})' + ORDINAL_SUFFIX + '_to_(\d{1,2})' \
                  + ORDINAL_SUFFIX + '$')
    # REMonth
    st_day, end_day = $1, $2
    return REMonth.new(st_day, end_day)
  when Regexp.new('^yearly_' + MONTHS + '_(\d{1,2})_to_' + MONTHS + '_(\d{1,2})$')
    # REYear
    st_mon, st_day, end_mon, end_day = $1, $2, $3, $4
    return REYear.new(Runt.const(st_mon), st_day, Runt.const(end_mon), end_day)
  when Regexp.new('^' + DAYS + '$')
    # DIWeek
    return DIWeek.new(Runt.const(name.to_s))
  when Regexp.new(WEEK_OF_MONTH_ORDINALS + '_' + DAYS)
    # DIMonth
    ordinal, day = $1, $2
    return DIMonth.new(Runt.const(ordinal), Runt.const(day))
  else
    # You're hosed
    nil
  end
end

# File lib/runt/sugar.rb, line 127
def method_missing(name, *args, &block) 
  result = self.build(name, *args, &block)
  return result unless result.nil?
  super
end

# File lib/runt/sugar.rb, line 167
def parse_time(hour, minute, ampm)
  hour = hour.to_i + 12 if ampm =~ /pm/
  [hour.to_i, minute.to_i]
end