class Fastly::Invoice

def self.delete_path
  raise "You can't DELETE to an invoice"
end

def self.get_path(*args)
  opts = args.size>0 ? args[0] : {}
  url  = "/billing"
  if opts.has_key?(:service_id)
    url += "/service/#{opts[:service_id]}"
  end
  if opts.has_key?(:year) && opts.has_key?(:month)
    url += "/year/#{opts[:year]}/month/#{opts[:month]}"
  end
  url
end

def self.list_path(*args)
  get_path(*args)
end

def self.post_path
  raise "You can't POST to an invoice"
end

def self.put_path
  raise "You can't PUT to an invoice"
end

def delete!
  raise "You can't delete an invoice"
end

def end
  DateTime.parse(end_time).new_offset(0)
end

def save!
  raise "You can't save an invoice"
end

def start
  DateTime.parse(start_time).new_offset(0)
end