class Origami::Date

def self.now
    now = Time.now.utc
    date =
    {
        year: now.strftime("%Y").to_i,
        month: now.strftime("%m").to_i,
        day: now.strftime("%d").to_i,
        hour: now.strftime("%H").to_i,
        min: now.strftime("%M").to_i,
        sec: now.strftime("%S").to_i,
        utc_offset: now.utc_offset
    }
    Origami::Date.new(**date)
end

def self.parse(str) #:nodoc:
    raise InvalidDateError, "Not a valid Date string" unless str =~ REGEXP_TOKEN
    date =
    {
        year: $~['year'].to_i
    }
    date[:month] = $~['month'].to_i if $~['month']
    date[:day] = $~['day'].to_i if $~['day']
    date[:hour] = $~['hour'].to_i if $~['hour']
    date[:min] = $~['min'].to_i if $~['min']
    date[:sec] = $~['sec'].to_i if $~['sec']
    if %w[+ -].include?($~['ut'])
        utc_offset = $~['ut_hour_off'].to_i * 3600 + $~['ut_min_off'].to_i * 60
        utc_offset = -utc_offset if $~['ut'] == '-'
        date[:utc_offset] = utc_offset
    end
    Origami::Date.new(**date)
end

def initialize(year:, month: 1, day: 1, hour: 0, min: 0, sec: 0, utc_offset: 0)
    @year, @month, @day, @hour, @min, @sec = year, month, day, hour, min, sec
    @utc_offset = utc_offset
    date = "D:%04d%02d%02d%02d%02d%02d" % [year, month, day, hour, min, sec ]
    if utc_offset == 0
        date << "Z00'00"
    else
        date << (if utc_offset < 0 then '-' else '+' end)
        off_hours, off_secs = utc_offset.abs.divmod(3600)
        off_mins = off_secs / 60
        date << "%02d'%02d" % [ off_hours, off_mins ]
    end
    super(date)
end

def to_datetime
    ::DateTime.new(@year, @month, @day, @hour, @min, @sec, (@utc_offset / 3600).to_s)
end