class OffsitePayments::Helper

def self.inherited(subclass)
  subclass.mappings ||= {}
end

def self.mapping(attribute, options = {})
  self.mappings[attribute] = options
end

def add_address(key, params)
  return if mappings[key].nil?
  code = lookup_country_code(params.delete(:country))
  add_field(mappings[key][:country], code)
  add_fields(key, params)
end

def add_field(name, value)
  return if name.blank? || value.blank?
  @fields[name.to_s] = value.to_s
end

def add_fields(subkey, params = {})
  params.each do |k, v|
    field = mappings[subkey][k]
    add_field(field, v) unless field.blank?
  end
end

def add_raw_html_field(name, value)
  return if name.blank? || value.blank?
  @raw_html_fields << [name, value]
end

def billing_address(params = {})
  add_address(:billing_address, params)
end

def form_fields
  @fields
end

def form_method
  "POST"
end

def initialize(order, account, options = {})
  options.assert_valid_keys([:amount, :currency, :test, :credential2, :credential3, :credential4, :country, :account_name, :description, :transaction_type, :authcode, :notify_url, :return_url, :redirect_param, :forward_url, :checkout_token])
  @fields             = {}
  @raw_html_fields    = []
  @test               = options[:test]
  self.order          = order
  self.account        = account
  self.amount         = options[:amount]
  self.currency       = options[:currency]
  self.credential2    = options[:credential2]
  self.credential3    = options[:credential3]
  self.credential4    = options[:credential4]
  self.notify_url     = options[:notify_url]
  self.return_url     = options[:return_url]
  self.redirect_param = options[:redirect_param]
  self.checkout_token = options[:checkout_token]
end

def lookup_country_code(name_or_code, format = country_format)
  country = ActiveUtils::Country.find(name_or_code)
  country.code(format).to_s
rescue ActiveUtils::InvalidCountryCodeError
  name_or_code
end

def method_missing(method_id, *args)
  method_id = method_id.to_s.gsub(/=$/, '').to_sym
  # Return and do nothing if the mapping was not found. This allows
  # for easy substitution of the different integrations
  return if mappings[method_id].nil?
  mapping = mappings[method_id]
  case mapping
  when Array
    mapping.each{ |field| add_field(field, args.last) }
  when Hash
    options = args.last.is_a?(Hash) ? args.pop : {}
    mapping.each{ |key, field| add_field(field, options[key]) }
  else
    add_field(mapping, args.last)
  end
end

def raw_html_fields
  @raw_html_fields
end

def shipping_address(params = {})
  add_address(:shipping_address, params)
end

def test?
  @test_mode ||= OffsitePayments.mode == :test || !!@test
end