class Labtime

# File lib/labtime.rb, line 38
def self.from_decimal(decimal_labtime, year, time_zone = ActiveSupport::TimeZone.new("Eastern Time (US & Canada)"))
  raise ArguementError, "No year supplied!" if year.blank?

  hour = decimal_labtime.to_i
  remainder = decimal_labtime - hour.to_f
  min_labtime = 60.0 * remainder
  min = min_labtime.to_i
  remainder = min_labtime - min.to_f
  sec = (60 * remainder).round.to_i

  self.new(year, hour, min, sec, time_zone)
end

# File lib/labtime.rb, line 61
def self.from_s(str, time_params = {}, time_zone = DEFAULT_TIME_ZONE)
  time_captures = /(\d+)\:(\d{1,2})(\:(\d{1,2}))?(\s(\d\d\d\d))?\z/.match(str).captures

  time_params[:hour] ||= time_captures[0]
  time_params[:min] ||= time_captures[1]
  time_params[:sec] ||= time_captures[3]
  time_params[:year] ||= time_captures[5]

  self.new(time_params[:year], time_params[:hour], time_params[:min], time_params[:sec], time_zone)
end

# File lib/labtime.rb, line 51
def self.from_seconds(sec_time, year, time_zone = DEFAULT_TIME_ZONE)
  hour = (sec_time / 3600.0).to_i
  sec_time = sec_time - (hour * 3600)
  min = (sec_time / 60.0).to_i
  sec_time = sec_time - (min * 60)
  sec = sec_time

  self.new(year, hour, min, sec, time_zone)
end

# File lib/labtime.rb, line 72
def initialize(year, hour, min, sec, time_zone = nil)
  @year = year.to_i
  @hour = hour.to_i
  @min = min.to_i
  @sec = sec.to_i
  @time_zone = time_zone || DEFAULT_TIME_ZONE
end

# File lib/labtime.rb, line 13
def self.parse(realtime)
  # Return nil if nil parameter
  return nil if realtime.nil?

  # Make sure datetime is an ActiveSupport:TimeWithZone object
  raise ArgumentError, "realtime class #{realtime.class} is not ActiveSupport::TimeWithZone" unless realtime.is_a?(ActiveSupport::TimeWithZone)

  # year is easy
  year = realtime.year

  # Reference fo labtime is start of year
  Time.zone = realtime.time_zone
  reference_time = Time.zone.local(year)

  # find difference between reference and
  second_difference = realtime.to_i - reference_time.to_i

  # convert second difference to labtime
  hour = second_difference / 3600
  min = (second_difference - (hour * 3600)) / 60
  sec = (second_difference - (hour * 3600) - (min * 60))

  self.new(year, hour, min, sec, realtime.time_zone)
end

# File lib/labtime.rb, line 85
def <=>(other)
  to_time <=> other.to_time
end

# File lib/labtime.rb, line 101
def add_seconds(sec)
  self.class.from_seconds(self.time_in_seconds + sec, self.year, self.time_zone)
end

# File lib/labtime.rb, line 97
def time_in_seconds
  hour * 3600 + min * 60 + sec
end

# File lib/labtime.rb, line 105
def to_decimal
  hour.to_f + (min.to_f/60.0) + (sec.to_f/3600.0)
end

# File lib/labtime.rb, line 89
def to_s
  "#{year} #{hour}:#{min}:#{sec} #{time_zone.to_s}"
end

# File lib/labtime.rb, line 93
def to_short_s
  "#{hour}:#{min}:#{sec}"
end

# File lib/labtime.rb, line 80
def to_time
  reference_time = time_zone.local(year)
  reference_time + time_in_seconds
end