# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS.  All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""EvaluationScore factory class.
"""

import logging

from . import exceptions
from . import eval_scores


class EvaluationScoreWorkerFactory(object):
    """Factory class used to instantiate evaluation score workers.

  The ctor gets the parametrs that are used to instatiate the evaluation score
  workers.
  """

    def __init__(self, polqa_tool_bin_path, echo_metric_tool_bin_path):
        self._score_filename_prefix = None
        self._polqa_tool_bin_path = polqa_tool_bin_path
        self._echo_metric_tool_bin_path = echo_metric_tool_bin_path

    def SetScoreFilenamePrefix(self, prefix):
        self._score_filename_prefix = prefix

    def GetInstance(self, evaluation_score_class):
        """Creates an EvaluationScore instance given a class object.

    Args:
      evaluation_score_class: EvaluationScore class object (not an instance).

    Returns:
      An EvaluationScore instance.
    """
        if self._score_filename_prefix is None:
            raise exceptions.InitializationException(
                'The score file name prefix for evaluation score workers is not set'
            )
        logging.debug('factory producing a %s evaluation score',
                      evaluation_score_class)

        if evaluation_score_class == eval_scores.PolqaScore:
            return eval_scores.PolqaScore(self._score_filename_prefix,
                                          self._polqa_tool_bin_path)
        elif evaluation_score_class == eval_scores.EchoMetric:
            return eval_scores.EchoMetric(self._score_filename_prefix,
                                          self._echo_metric_tool_bin_path)
        else:
            return evaluation_score_class(self._score_filename_prefix)