module ActiveModel
  module Validations
    module ClassMethods
      # Validates whether the value of the specified attribute is of the correct form, going by the regular expression provided.
      # You can require that the attribute matches the regular expression:
      #
      #   class Person < ActiveRecord::Base
      #     validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :on => :create
      #   end
      #
      # Alternatively, you can require that the specified attribute does _not_ match the regular expression:
      #
      #   class Person < ActiveRecord::Base
      #     validates_format_of :email, :without => /NOSPAM/
      #   end
      #
      # Note: use <tt>\A</tt> and <tt>\Z</tt> to match the start and end of the string, <tt>^</tt> and <tt>$</tt> match the start/end of a line.
      #
      # You must pass either <tt>:with</tt> or <tt>:without</tt> as an option. In addition, both must be a regular expression,
      # or else an exception will be raised.
      #
      # Configuration options:
      # * <tt>:message</tt> - A custom error message (default is: "is invalid").
      # * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
      # * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
      # * <tt>:with</tt> - Regular expression that if the attribute matches will result in a successful validation.
      # * <tt>:without</tt> - Regular expression that if the attribute does not match will result in a successful validation.
      # * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <tt>:update</tt>).
      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
      #   occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>).  The
      #   method, proc or string should return or evaluate to a true or false value.
      # * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
      #   not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>).  The
      #   method, proc or string should return or evaluate to a true or false value.
      def validates_format_of(*attr_names)
        configuration = attr_names.extract_options!

        unless configuration.include?(:with) ^ configuration.include?(:without)  # ^ == xor, or "exclusive or"
          raise ArgumentError, "Either :with or :without must be supplied (but not both)"
        end

        if configuration[:with] && !configuration[:with].is_a?(Regexp)
          raise ArgumentError, "A regular expression must be supplied as the :with option of the configuration hash"
        end

        if configuration[:without] && !configuration[:without].is_a?(Regexp)
          raise ArgumentError, "A regular expression must be supplied as the :without option of the configuration hash"
        end

        validates_each(attr_names, configuration) do |record, attr_name, value|
          if configuration[:with] && value.to_s !~ configuration[:with]
            record.errors.add(attr_name, :invalid, :default => configuration[:message], :value => value)
          end

          if configuration[:without] && value.to_s =~ configuration[:without]
            record.errors.add(attr_name, :invalid, :default => configuration[:message], :value => value)
          end
        end
      end
    end
  end
end