class JustTime

# File lib/just_time.rb, line 18
def from_time(time)
  return nil if time.nil?
  secs = ( time - midnight(time) ).to_i 
  self.new(secs)
end

# File lib/just_time.rb, line 44
def midnight(time=Time.now)
  Time.new(time.year, time.month, time.day)
end

# File lib/just_time.rb, line 50
def initialize(*arg)
  fail_bad_params("new", arg) unless arg.all?{|a| a.kind_of?(Fixnum) }
  fail_bad_params("new", arg) if arg.size > 1 && arg.any?{|a| a < 0}

  @ssm = 
    case arg.size
      when 1 
        @ssm = arg.first
      when 2 
        fail_bad_params("new", arg) if arg.first > 24 || arg.last > 59
        @ssm = arg.last * 60 + arg.first * 60 * 60
      when 3
        fail_bad_params("new", arg) if arg[0] > 24 || arg[1] > 59 || arg[2] > 59
        @ssm = arg[2] + arg[1] * 60 + arg[0] * 60 * 60
      else
        fail_bad_params("new", arg)
      end

end

# File lib/just_time.rb, line 39
def now
  secs = (Time.now - midnight).to_i
  self.new(secs)
end

# File lib/just_time.rb, line 24
def parse(string)
  return nil if (string.nil? || string =~ /\A\s*\Z/)

  begin
    parts = string.split(":").map{|s| Integer(s, 10) }
    raise if parts.size < 2
  rescue
    raise ArgumentError,
          "Bad parameters passed to JustTime.parse - '#{string}'"

  end

  self.new(*parts)
end

# File lib/just_time.rb, line 114
def +(other)
  o = other.kind_of?(JustTime) ? other.ssm : other
  JustTime.new(ssm + o)
end

# File lib/just_time.rb, line 109
def -(other)
  o = other.kind_of?(JustTime) ? other.ssm : other
  JustTime.new(ssm - o)
end

# File lib/just_time.rb, line 119
def <=>(other)
  return 0 unless other.kind_of? JustTime
  ssm <=> other.ssm
end

# File lib/just_time.rb, line 77
def hours 
  ssm / (60 * 60)
end

# File lib/just_time.rb, line 105
def inspect
  "#<JustTime #{to_s}>"
end

# File lib/just_time.rb, line 70
def minutes
  ssm / 60 % 60
end

# File lib/just_time.rb, line 84
def seconds
  ssm % 60
end

# File lib/just_time.rb, line 98
def to_s(mode=:hhmmss)
  case mode
    when :hhmm then "%02d:%02d" % [ hours, minutes ]
    else "%02d:%02d:%02d" % [ hours, minutes, seconds ]
  end
end

# File lib/just_time.rb, line 94
def to_time(date=Date.today)
  Time.new(date.year, date.month, date.day, hours, minutes, seconds)
end

# File lib/just_time.rb, line 126
def fail_bad_params(method, para)
  raise ArgumentError,
        "Bad parameters passed to JustTime.#{method} - '#{para.inspect}'",
        caller

end