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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

module Arrow
  class Decimal128ArrayBuilder
    class << self
      def build(data_type, values)
        builder = new(data_type)
        builder.build(values)
      end
    end

    alias_method :append_value_raw, :append_value
    def append_value(value)
      append_value_raw(normalize_value(value))
    end

    alias_method :append_values_raw, :append_values
    def append_values(values, is_valids=nil)
      if values.is_a?(::Array)
        values = values.collect do |value|
          normalize_value(value)
        end
        append_values_raw(values, is_valids)
      else
        append_values_packed(values, is_valids)
      end
    end

    private
    def precision
      @precision ||= value_data_type.precision
    end

    def scale
      @scale ||= value_data_type.scale
    end

    def normalize_value(value)
      case value
      when BigDecimal
        if value.nan? or value.infinite?
          message = "can't use #{value} as an Arrow::Decimal128Array value"
          raise FloatDomainError, message
        end
        integer, decimal = value.to_s("f").split(".", 2)
        decimal = decimal[0, scale].ljust(scale, "0")
        Decimal128.new("#{integer}.#{decimal}")
      else
        Decimal128.try_convert(value) || value
      end
    end
  end
end
