# Copyright (C) 2018 The Android Open Source Project
#
# Licensed 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.

import subprocess

class GitConfigParser:

  def __init__(self, config_path):
    self.path = config_path

  def _execute_shell_command_and_get_output_lines(self, command):
    sub_process_run = subprocess.run(
      command.split(),
      stdout=subprocess.PIPE,
      check=True,
      universal_newlines=True)
    return [line.strip() for line in sub_process_run.stdout.splitlines()]

  def _get_value(self, key):
    command = "git config -f %s --get %s" % (self.path, key)
    return self._execute_shell_command_and_get_output_lines(command)

  def get(self, key, default=None):
    """
    Returns value of given key in the configuration file. If the key appears
    multiple times, the last value is returned.
    """
    try:
      return self._get_value(key)[-1]
    except subprocess.CalledProcessError:
      return default

  def get_boolean(self, key, default=False):
    """
    Returns boolean value of given key in the configuration file. If the key
    appears multiple times, the last value is returned.
    """
    if not isinstance(default, bool):
      raise TypeError("Default has to be a boolean.")

    try:
      value = self._get_value(key)[-1].lower()
      if value == "true":
        return True
      elif value == "false":
        return False
      else:
        raise TypeError("Value is not a boolean.")
    except subprocess.CalledProcessError:
      return default