anthonator/rosebud

module Rosebud
  class ParamsScope
    def initialize(controller, params, &block)
      @controller = controller
      @params = params
      @declared_params = []

      instance_eval(&block)
    end

    def requires(name, validations = {})
      name = name.to_sym
      validations.merge!({ presence: true })

      validate(name, @params[name], validations)
    end

    def optional(name, options = {})
      name = name.to_sym
      if (@params[name].nil? || @params[name] == '') && options.has_key?(:default)
        default = options.delete(:default)
        @params[name] = default.respond_to?(:call) ? default.call(@params, @controller) : default
      end
      validate(name, @params[name], options)
    end

    private
    def validate(attribute, value, validations)
      validations.each do |type, options|
        next if type == :default

        validator_class = Validations.validators[type]
        raise("Validator #{type} is not registered...") unless validator_class

        validator_class.new.validate_param(attribute, value, options)
        if type == :type
          coerced = Rosebud::Validations::TypeValidator.new.send(:coerce_value, options, value)
          if coerced != value
            @params[attribute] = coerced
          end
        end
      end
    end
  end
end