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# to you under the Apache License, Version 2.0 (the
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'''Helpers for parsing command line options'''

import logging
import os
import sys
from getpass import getuser
from requests.packages.urllib3.exceptions import (
    InsecurePlatformWarning,
    InsecureRequestWarning,
    SecurityWarning)
from tempfile import gettempdir
from warnings import filterwarnings

from tests.comparison import db_connection
from tests.comparison.cluster import (
    CmCluster,
    DEFAULT_HIVE_HOST,
    DEFAULT_HIVE_PASSWORD,
    DEFAULT_HIVE_PORT,
    DEFAULT_HIVE_USER,
    CM_CLEAR_PORT,
    CM_TLS_PORT,
    MiniCluster,
    MiniHiveCluster,
)
from tests.comparison.db_types import TYPES


def add_logging_options(parser, default_debug_log_file=None):
  if not default_debug_log_file:
    default_debug_log_file = os.path.join(
        gettempdir(), os.path.basename(sys.modules["__main__"].__file__) + ".log")
  parser.add_argument(
      '--log-level', default='INFO',
      help='The log level to use.', choices=('DEBUG', 'INFO', 'WARN', 'ERROR'))
  parser.add_argument(
      '--debug-log-file', default=default_debug_log_file,
      help='Path to debug log file.')


def configure_logging(log_level, debug_log_file=None, log_thread_name=False,
                      log_process_id=False):
  root_logger = logging.getLogger()
  root_logger.setLevel(logging.DEBUG)

  console_logger = logging.StreamHandler(sys.stdout)
  console_logger.name = "console"
  console_logger.setLevel(getattr(logging, log_level))
  format = "%(asctime)s"
  if log_process_id:
    format += " %(process)d"
  if log_thread_name:
    format += " %(threadName)s"
  format += " %(levelname)s:%(module)s[%(lineno)s]:%(message)s"
  console_logger.setFormatter(logging.Formatter(format))
  root_logger.addHandler(console_logger)

  if debug_log_file:
    file_logger = logging.FileHandler(debug_log_file)
    file_logger.name = "file"
    file_logger.setFormatter(logging.Formatter(format))
    file_logger.setLevel(logging.DEBUG)
    root_logger.addHandler(file_logger)

  def create_third_party_filter(level):
    def filter_record(record):
      name = record.name
      if name.startswith("impala.") or name.startswith("paramiko.") or \
         name.startswith("hdfs") or name.startswith("requests"):
        return record.levelno >= level
      return True
    log_filter = logging.Filter()
    log_filter.filter = filter_record
    return log_filter
  console_logger.addFilter(create_third_party_filter(logging.WARN))
  if debug_log_file:
    file_logger.addFilter(create_third_party_filter(logging.INFO))


def add_ssh_options(parser):
  parser.add_argument(
      '--ssh-user', metavar='user name', default=getuser(),
      help='The user name to use for SSH connections to cluster nodes.')
  parser.add_argument(
      '--ssh-key-file', metavar='path to file',
      help='Specify an additional SSH key other than the defaults in ~/.ssh.')
  parser.add_argument(
      '--ssh-port', metavar='number', type=int, default=22,
      help='The port number to use when connecting through SSH.')


def add_db_name_option(parser):
  parser.add_argument(
      '--db-name', default='randomness',
      help='The name of the database to use. Ex: functional.')


def add_cluster_options(parser):
  add_minicluster_options(parser)
  add_cm_options(parser)
  add_ssh_options(parser)
  parser.add_argument(
      '--hadoop-user-name', default=getuser(),
      help='The user name to use when interacting with hadoop.')


def add_minicluster_options(parser):
  group = parser.add_argument_group('Hive Options')
  group.add_argument(
      '--use-hive', action='store_true', default=False,
      help='Use Hive (Impala will be skipped)')
  group.add_argument(
      '--hive-host', default=DEFAULT_HIVE_HOST,
      help='The name of the host running the HS2')
  group.add_argument(
      '--hive-port', default=DEFAULT_HIVE_PORT, type=int,
      help='The port of HiveServer2')
  group.add_argument(
      '--hive-user', default=DEFAULT_HIVE_USER,
      help='The user name to use when connecting to HiveServer2')
  group.add_argument(
      '--hive-password', default=DEFAULT_HIVE_PASSWORD,
      help='The password to use when connecting to HiveServer2')
  parser.add_argument_group(group)

  parser.add_argument(
      '--minicluster-num-impalads', default=3, type=int, metavar='num impalads',
      help='The number of impalads in the mini cluster.')


def add_cm_options(parser):
  parser.add_argument(
      '--cm-host', metavar='host name',
      help='The host name of the CM server.')
  # IMPALA-5455: --cm-port defaults to None so that --use-tls can later influence the
  # default value of --cm-port: it needs to default to 7180, or 7183 if --use-tls is
  # included.
  parser.add_argument(
      '--cm-port', default=None, type=int, metavar='port number',
      help='Override the CM port. Defaults to {clear}, or {tls} with --use-tls'.format(
          clear=CM_CLEAR_PORT,
          tls=CM_TLS_PORT))
  parser.add_argument(
      '--cm-user', default="admin", metavar='user name',
      help='The name of the CM user.')
  parser.add_argument(
      '--cm-password', default="admin", metavar='password',
      help='The password for the CM user.')
  parser.add_argument(
      '--cm-cluster-name', metavar='name',
      help='If CM manages multiple clusters, use this to specify which cluster to use.')
  parser.add_argument(
      '--use-tls', action='store_true', default=False,
      help='Whether to communicate with CM using TLS. This alters the default CM port '
           'from {clear} to {tls}'.format(clear=CM_CLEAR_PORT, tls=CM_TLS_PORT))


def add_ssl_options(parser):
  group = parser.add_argument_group('SSL Options')
  group.add_argument(
      '--use-ssl', action='store_true', default=False,
      help='Use SSL to connect')
  group.add_argument(
      '--ca_cert', default=None, metavar='CA cert path',
      help='Path to optional CA certificate. This is needed to verify SSL requests if '
           'the Impala certificate is self-signed in a test environment.')


def create_cluster(args):
  if args.cm_host:
    cluster = CmCluster(
        args.cm_host, port=args.cm_port, user=args.cm_user, password=args.cm_password,
        cluster_name=args.cm_cluster_name, ssh_user=args.ssh_user, ssh_port=args.ssh_port,
        ssh_key_file=args.ssh_key_file, use_tls=args.use_tls)
  elif args.use_hive:
    cluster = MiniHiveCluster(args.hive_host, args.hive_port)
  else:
    cluster = MiniCluster(args.hive_host, args.hive_port, args.minicluster_num_impalads)
  cluster.hadoop_user_name = args.hadoop_user_name
  cluster.use_kerberos = getattr(args, 'use_kerberos', False)
  cluster.use_ssl = getattr(args, 'use_ssl', False)
  if cluster.use_ssl:
    # Prevent excessive warning spam on the console.
    #
    # The first warning is related to certificates that do not comply with RFC 2818.
    # https://github.com/shazow/urllib3/issues/497 . Permit one warning.
    filterwarnings(
        'once',
        'Certificate has no `subjectAltName`',
        SecurityWarning)
    # Permit one warning with unverified HTTPS requests
    filterwarnings(
        'once',
        'Unverified HTTPS request is being made',
        InsecureRequestWarning)
    # TODO: IMPALA-5264 to fix python environment to prevent InsecurePlatformWarning .
    # Once we fix that we should remove this suppression.
    filterwarnings(
        'once',
        'A true SSLContext object is not available',
        InsecurePlatformWarning)
  cluster.ca_cert = getattr(args, 'ca_cert', None)
  return cluster


def add_storage_format_options(parser):
  storage_formats = ['avro', 'parquet', 'rcfile', 'sequencefile', 'textfile']
  parser.add_argument(
      '--storage-file-formats', default=','.join(storage_formats),
      help='A comma separated list of storage formats to use.')


def add_data_types_options(parser):
  parser.add_argument(
      '--data-types', default=','.join(type_.__name__ for type_ in TYPES),
      help='A comma separated list of data types to use.')


def add_timeout_option(parser):
  parser.add_argument(
      '--timeout', default=(3 * 60), type=int, help='Query timeout in seconds')


def add_connection_option_groups(parser):

  group = parser.add_argument_group('MySQL Options')
  group.add_argument(
      '--use-mysql', action='store_true', help='Use MySQL')
  group.add_argument(
      '--mysql-host', default='localhost',
      help='The name of the host running the MySQL database.')
  group.add_argument(
      '--mysql-port', default=3306, type=int,
      help='The port of the host running the MySQL database.')
  group.add_argument(
      '--mysql-user', default='root',
      help='The user name to use when connecting to the MySQL database.')
  group.add_argument(
      '--mysql-password',
      help='The password to use when connecting to the MySQL database.')
  parser.add_argument_group(group)

  group = parser.add_argument_group('Oracle Options')
  group.add_argument('--use-oracle', action='store_true', help='Use Oracle')
  group.add_argument(
      '--oracle-host', default='localhost',
      help='The name of the host running the Oracle database.')
  group.add_argument(
      '--oracle-port', default=1521, type=int,
      help='The port of the host running the Oracle database.')
  group.add_argument(
      '--oracle-user', default='system',
      help='The user name to use when connecting to the Oracle database.')
  group.add_argument(
      '--oracle-password',
      help='The password to use when connecting to the Oracle database.')
  parser.add_argument_group(group)

  group = parser.add_argument_group('Postgresql Options')
  group.add_argument(
      '--use-postgresql', action='store_true', help='Use Postgresql')
  group.add_argument(
      '--postgresql-host', default='localhost',
      help='The name of the host running the Postgresql database.')
  group.add_argument(
      '--postgresql-port', default=5432, type=int,
      help='The port of the host running the Postgresql database.')
  group.add_argument(
      '--postgresql-user', default='postgres',
      help='The user name to use when connecting to the Postgresql database.')
  group.add_argument(
      '--postgresql-password',
      help='The password to use when connecting to the Postgresql database.')
  parser.add_argument_group(group)


def get_db_type(args):
  db_types = list()
  if args.use_mysql:
    db_types.append(db_connection.MYSQL)
  if args.use_oracle:
    db_types.append(db_connection.ORACLE)
  if args.use_postgresql:
    db_types.append(db_connection.POSTGRESQL)
  if not db_types:
    raise Exception(
        "At least one of --use-mysql, --use-oracle, or --use-postgresql must be used")
  elif len(db_types) > 1:
    raise Exception("Too many databases requested: %s" % db_types)
  return db_types[0]


def create_connection(args, db_type=None, db_name=None):
  if not db_type:
    db_type = get_db_type(args)
  if db_type == db_connection.POSTGRESQL:
    conn_class = db_connection.PostgresqlConnection
  elif db_type == db_connection.MYSQL:
    conn_class = db_connection.MySQLConnection
  elif db_type == db_connection.ORACLE:
    conn_class = db_connection.OracleConnection
  elif db_type == db_connection.HIVE:
    conn_class = db_connection.HiveConnection
  else:
    raise Exception(
        'Unexpected db_type: %s; expected one of %s.' % (
            db_type, ', '.join([db_connection.POSTGRESQL, db_connection.MYSQL,
                                db_connection.ORACLE])))
  prefix = db_type.lower()
  return conn_class(
      user_name=getattr(args, prefix + '_user'),
      password=getattr(args, prefix + '_password'),
      host_name=getattr(args, prefix + '_host'),
      port=getattr(args, prefix + '_port'),
      db_name=db_name)


def add_kerberos_options(parser):
  parser.add_argument(
      "--use-kerberos", action="store_true",
      help="Use kerberos when communicating with Impala. This requires that kinit has"
      " already been done before running this script.")
  parser.add_argument(
      "--kerberos-principal", default=getuser(), help="The principal name to use.")