# -*- coding: utf-8 -*- #
# Copyright 2015 Google LLC. All Rights Reserved.
#
# 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
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"""'logging metrics create' command."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from googlecloudsdk.api_lib.logging import util
from googlecloudsdk.calliope import arg_parsers
from googlecloudsdk.calliope import base
from googlecloudsdk.core import log

DETAILED_HELP = {
    'DESCRIPTION':
        """\
          Create a logs-based metric to count the number of log entries that
          match a filter expression. Logs-based metrics can also be used to
          extract values from logs and create a distribution of the values.
      """,
    'EXAMPLES':
        """\
          To create a metric that counts the number of log entries with a
          severity level higher than WARNING, run:

            $ {command} high_severity_count --description="Number of high severity log entries" --log-filter="severity > WARNING"

          Detailed information about filters can be found at:
          [](https://cloud.google.com/logging/docs/view/logging-query-language)

          To create a metric that uses advanced features like distribution or
          user-defined labels, run:

            $ {command} my_metric --config-from-file=$PATH_TO_FILE

          The config file can be in YAML or JSON format. Detailed information
          about how to configure metrics can be found at: [](https://cloud.google.com/logging/docs/reference/v2/rest/v2/projects.metrics#LogMetric).

          To create a bucket log-based metric, run:

            $ {command} my_bucket_metric --description="DESCRIPTION" --log-filter="LOG_FILTER" --bucket-name="BUCKET_NAME"
      """,
}


@base.ReleaseTracks(base.ReleaseTrack.GA, base.ReleaseTrack.BETA,
                    base.ReleaseTrack.ALPHA)
class Create(base.CreateCommand):
  """Create a logs-based metric."""

  @staticmethod
  def Args(parser):
    """Register flags for this command."""
    parser.add_argument('metric_name', help='The name of the new metric.')
    config_group = parser.add_argument_group(help='Data about the new metric.',
                                             mutex=True,
                                             required=True
                                            )
    legacy_mode_group = config_group.add_argument_group(
        help=('A group of arguments to specify simple counter logs-based '
              'metrics. '))
    legacy_mode_group.add_argument(
        '--description', required=True,
        help='The metric\'s description.')
    legacy_mode_group.add_argument(
        '--log-filter', required=True,
        help='The metric\'s filter expression.')
    legacy_mode_group.add_argument(
        '--bucket-name',
        help='The Log Bucket name which owns the log-based metric.')
    config_group.add_argument('--config-from-file',
                              help=('A path to a YAML or JSON file specifying '
                                    'the logs-based metric to create.'),
                              type=arg_parsers.FileContents())

  def Run(self, args):
    """This is what gets called when the user runs this command.

    Args:
      args: an argparse namespace. All the arguments that were provided to this
        command invocation.

    Returns:
      The created metric.
    """
    messages = util.GetMessages()

    new_metric = util.CreateLogMetric(
        metric_name=args.metric_name,
        description=args.description,
        log_filter=args.log_filter,
        bucket_name=args.bucket_name,
        data=args.config_from_file)
    request = messages.LoggingProjectsMetricsCreateRequest(
        parent=util.GetCurrentProjectParent(), logMetric=new_metric)
    result = util.GetClient().projects_metrics.Create(request)
    log.CreatedResource(args.metric_name)
    return result


Create.detailed_help = DETAILED_HELP