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module ActiveRecord
  module AttributeMethods
    module TimeZoneConversion
      extend ActiveSupport::Concern

      included do
        cattr_accessor :time_zone_aware_attributes, :instance_writer => false
        self.time_zone_aware_attributes = false

        class_inheritable_accessor :skip_time_zone_conversion_for_attributes, :instance_writer => false
        self.skip_time_zone_conversion_for_attributes = []
      end

      module ClassMethods
        protected
          # Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled.
          # This enhanced read method automatically converts the UTC time stored in the database to the time
          # zone stored in Time.zone.
          def define_method_attribute(attr_name)
            if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
              method_body, line = <<-EOV, __LINE__ + 1
def _#{attr_name}(reload = false)
cached = @attributes_cache['#{attr_name}']
return cached if cached && !reload
time = _read_attribute('#{attr_name}')
@attributes_cache['#{attr_name}'] = time.acts_like?(:time) ? time.in_time_zone : time
end
alias #{attr_name} _#{attr_name}
EOV
              generated_attribute_methods.module_eval(method_body, __FILE__, line)
            else
              super
            end
          end

          # Defined for all +datetime+ and +timestamp+ attributes when +time_zone_aware_attributes+ are enabled.
          # This enhanced write method will automatically convert the time passed to it to the zone stored in Time.zone.
          def define_method_attribute=(attr_name)
            if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
              method_body, line = <<-EOV, __LINE__ + 1
def #{attr_name}=(original_time)
time = original_time
unless time.acts_like?(:time)
time = time.is_a?(String) ? Time.zone.parse(time) : time.to_time rescue time
end
time = time.in_time_zone rescue nil if time
write_attribute(:#{attr_name}, original_time)
@attributes_cache["#{attr_name}"] = time
end
EOV
              generated_attribute_methods.module_eval(method_body, __FILE__, line)
            else
              super
            end
          end

        private
          def create_time_zone_conversion_attribute?(name, column)
            time_zone_aware_attributes && !skip_time_zone_conversion_for_attributes.include?(name.to_sym) && [:datetime, :timestamp].include?(column.type)
          end
      end
    end
  end
end
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