class Grape::Validations::Validators::CoerceValidator

def coerce_value(val)
  converter.call(val)
  # Some custom types might fail, so it should be treated as an invalid value
rescue StandardError
  Types::InvalidValue.new
end

def initialize(attrs, options, required, scope, opts)
  super
  @converter = if type.is_a?(Grape::Validations::Types::VariantCollectionCoercer)
                 type
               else
                 Types.build_coercer(type, method: @option[:method])
               end
end

def type
  @option[:type].is_a?(Hash) ? @option[:type][:value] : @option[:type]
end

def valid_type?(val)
  !val.is_a?(Types::InvalidValue)
end

def validate_param!(attr_name, params)
  raise validation_exception(attr_name) unless params.is_a? Hash
  new_value = coerce_value(params[attr_name])
  raise validation_exception(attr_name, new_value.message) unless valid_type?(new_value)
  # Don't assign a value if it is identical. It fixes a problem with Hashie::Mash
  # which looses wrappers for hashes and arrays after reassigning values
  #
  #     h = Hashie::Mash.new(list: [1, 2, 3, 4])
  #     => #<Hashie::Mash list=#<Hashie::Array [1, 2, 3, 4]>>
  #     list = h.list
  #     h[:list] = list
  #     h
  #     => #<Hashie::Mash list=[1, 2, 3, 4]>
  return if params[attr_name].instance_of?(new_value.class) && params[attr_name] == new_value
  params[attr_name] = new_value
end

def validation_exception(attr_name, custom_msg = nil)
  Grape::Exceptions::Validation.new(
    params: [@scope.full_name(attr_name)],
    message: custom_msg || message(:coerce)
  )
end