class Date

# File lib/feast_fast/date.rb, line 3
def self.easter(year=self.today.year)
  # FeastFast::DB.data(year.to_i)[:easter]
  raise TypeError, 'expected fixnum' unless year.instance_of? Fixnum
  a = (19 * (year % 19) + 15) % 30
  b = (2 * (year % 4) + 4 * (year % 7) + 6 * a + 6) % 7
  c = a + b
  if c > 9
    d = c - 9 # day
    m = 4 # month
  else
    d = 22 + c # day
    m = 3 # month
  end
  self.new(year, m, d) + 13
end

# File lib/feast_fast/date.rb, line 19
def self.with_feasts(year, *statuses)
  FeastFast::DB.feasts(year, *statuses).keys.sort
end

# File lib/feast_fast/date.rb, line 30
def easter?
  self == FeastFast::DB.data(self.year)[:easter]
end

# File lib/feast_fast/date.rb, line 26
def fast
  @fast ||= FeastFast::DB.date(self)[:fast]
end

# File lib/feast_fast/date.rb, line 34
def fast?
  self.fast.status != FeastFast::Fast::STATUS::NO
end

# File lib/feast_fast/date.rb, line 23
def feasts
  @feasts ||= FeastFast::DB.date(self)[:feasts]
end

# File lib/feast_fast/date.rb, line 38
def feasts?() self.feasts.any? end

# File lib/feast_fast/date.rb, line 49
def next_date(n=1) self + n end

# File lib/feast_fast/date.rb, line 73
def next_easter
  easter = self.class.easter(self.year)
  if easter > self
    easter
  else
    self.class.easter(self.year + 1)
  end
end

# File lib/feast_fast/date.rb, line 52
def next_sunday(step=1)
  days_to_sunday = self.wday!=0 ? 7-self.wday : 0
  days_to_sunday = days_to_sunday + 7*(step-1)
  result = self + days_to_sunday
end

# File lib/feast_fast/date.rb, line 40
def next_with_feast(*statuses)
  self.class.with_feasts(self.year, *statuses).find{|d| d > self } || self.class.with_feasts(self.year + 1, *statuses).first
end

# File lib/feast_fast/date.rb, line 50
def prev_date(n=1) self - n end

# File lib/feast_fast/date.rb, line 58
def prev_sunday(step=1)
  days_to_sunday = self.wday!=0 ? self.wday : 0
  days_to_sunday = days_to_sunday + 7*(step-1)
  result = self - days_to_sunday
end

# File lib/feast_fast/date.rb, line 44
def prev_with_feast(*statuses)
  self.class.with_feasts(self.year, *statuses).reverse.find{|d| d < self } || self.class.with_feasts(self.year - 1, *statuses).last
end

# File lib/feast_fast/date.rb, line 70
def week_ago() weeks_ago end

# File lib/feast_fast/date.rb, line 71
def week_since() weeks_since end

# File lib/feast_fast/date.rb, line 64
def weeks_ago(step=1)
  self - 7*step
end

# File lib/feast_fast/date.rb, line 67
def weeks_since(step=1)
  self + 7*step
end