class Icalendar::Timezone

# File lib/icalendar/timezone.rb, line 44
def initialize
  super 'timezone'
end

# File lib/icalendar/timezone.rb, line 91
def daylight_for(local)
  possible = daylights.map do |day|
    schedule = IceCube::Schedule.new(day.dtstart.to_time) do |s|
      day.rrule.each do |rule|
        s.add_recurrence_rule IceCube::Rule.from_ical(rule.value_ical)
      end
      day.rdate.each do |date|
        s.add_recurrence_time date.to_time
      end
    end
    [schedule.previous_occurrence(local.to_time), day]
  end
  possible.sort_by(&:first).last
end

# File lib/icalendar/timezone.rb, line 55
def offset_for_local(local)
  standard = standard_for local
  daylight = daylight_for local

  if standard.nil? && daylight.nil?
    "+00:00"
  elsif daylight.nil?
    standard.last.tzoffsetto
  elsif standard.nil?
    daylight.last.tzoffsetto
  else
    sdst = standard.first
    ddst = daylight.first
    if sdst > ddst
      standard.last.tzoffsetto
    else
      daylight.last.tzoffsetto
    end
  end
end

# File lib/icalendar/timezone.rb, line 76
def standard_for(local)
  possible = standards.map do |std|
    schedule = IceCube::Schedule.new(std.dtstart.to_time) do |s|
      std.rrule.each do |rule|
        s.add_recurrence_rule IceCube::Rule.from_ical(rule.value_ical)
      end
      std.rdate.each do |date|
        s.add_recurrence_time date.to_time
      end
    end
    [schedule.previous_occurrence(local.to_time), std]
  end
  possible.sort_by(&:first).last
end

# File lib/icalendar/timezone.rb, line 48
def valid?(strict = false)
  daylights.empty? && standards.empty? and return false
  daylights.all? { |d| d.valid? strict } or return false
  standards.all? { |s| s.valid? strict } or return false
  super
end