module JSONVAT

# File lib/json_vat.rb, line 73
def [](country)
  country(country)
end

# File lib/json_vat.rb, line 31
def cache
  content = self.download
  self.cache_backend.write(content)
  content
end

# File lib/json_vat.rb, line 15
def cache_backend
  @cache_backend ||= FileCacheBackend.new
end

# File lib/json_vat.rb, line 63
def country(country)
  code = country.to_s.upcase

  # Fix ISO-3166-1-alpha2 exceptions
  if code == 'UK' then code = 'GB' end
  if code == 'EL' then code = 'GR' end

  self.rates.find { |r| r.country_code == code }
end

# File lib/json_vat.rb, line 27
def download
  Net::HTTP.get_response(URI.parse(self.host)).body
end

# File lib/json_vat.rb, line 19
def host
  @host ||= 'http://jsonvat.com'
end

# File lib/json_vat.rb, line 45
def load_rates
  JSON.parse(self.rates_through_cache)['rates'].map do |country|
    JSONVAT::Country.new(country)
  end
end

# File lib/json_vat.rb, line 11
def perform_caching?
  @perform_caching != false
end

# File lib/json_vat.rb, line 55
def rates
  if reload_rates?
    @rates = load_rates
  else
    @rates
  end
end

# File lib/json_vat.rb, line 37
def rates_through_cache
  if self.perform_caching?
    self.cache_backend.read || self.cache
  else
    self.download
  end
end

# File lib/json_vat.rb, line 51
def reload_rates?
  !self.perform_caching? || (self.perform_caching? && self.cache_backend.invalid?)
end