# -*- coding: utf-8 -*- #
# Copyright 2019 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
#
# 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.
"""Create GitHub trigger command."""

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

from googlecloudsdk.api_lib.cloudbuild import cloudbuild_util
from googlecloudsdk.api_lib.cloudbuild import trigger_config as trigger_utils
from googlecloudsdk.calliope import base
from googlecloudsdk.core import log
from googlecloudsdk.core import properties
from googlecloudsdk.core import resources


class CreateGitHub(base.CreateCommand):
  """Create a build trigger for a GitHub repository."""

  detailed_help = {
      'EXAMPLES':
          """\
            To create a push trigger with a 1st-gen repository for all branches:

              $ {command} --name="my-trigger" --service-account="projects/my-project/serviceAccounts/my-byosa@my-project.iam.gserviceaccount.com" --repo-owner="GoogleCloudPlatform" --repo-name="cloud-builders" --branch-pattern=".*" --build-config="cloudbuild.yaml"

            To create a pull request trigger with a 1st-gen repository for master:

              $ {command} --name="my-trigger" --service-account="projects/my-project/serviceAccounts/my-byosa@my-project.iam.gserviceaccount.com" --repo-owner="GoogleCloudPlatform" --repo-name="cloud-builders" --pull-request-pattern="^master$" --build-config="cloudbuild.yaml"

            To create a pull request trigger with a 2nd gen repository for master:

              $ {command} --name="my-trigger"  --repository=projects/my-project/locations/us-central1/connections/my-conn/repositories/my-repo --pull-request-pattern="^master$" --build-config="cloudbuild.yaml"

          """,
  }

  @staticmethod
  def Args(parser):
    """Register flags for this command.

    Args:
      parser: An argparse.ArgumentParser-like object. It is mocked out in order
        to capture some information, but behaves like an ArgumentParser.
    """
    flag_config = trigger_utils.AddTriggerArgs(parser)

    gen_config = flag_config.add_mutually_exclusive_group(required=True)
    gen_config.add_argument(
        '--repository',
        help=("""\
Repository resource (2nd gen) to use, in the format
"projects/*/locations/*/connections/*/repositories/*".
"""),
    )
    v1_config = gen_config.add_argument_group(
        help='1st-gen repository settings.')
    v1_config.add_argument(
        '--repo-owner',
        help='Owner of the GitHub Repository (1st gen).',
        required=True)
    v1_config.add_argument(
        '--repo-name',
        help='Name of the GitHub Repository (1st gen).',
        required=True)
    v1_config.add_argument(
        '--enterprise-config',
        help="""\
Resource name of the GitHub Enterprise config that should be applied to this
installation.

For example: "projects/{$project_id}/locations/{$location_id}/githubEnterpriseConfigs/{$config_id}
        """)

    ref_config = flag_config.add_mutually_exclusive_group(required=True)
    trigger_utils.AddBranchPattern(ref_config)
    trigger_utils.AddTagPattern(ref_config)
    pr_config = ref_config.add_argument_group(help='Pull Request settings')
    pr_config.add_argument(
        '--pull-request-pattern',
        metavar='REGEX',
        required=True,
        help="""\
A regular expression specifying which base git branch to match for
pull request events.

This pattern is used as a regex search for the base branch (the branch you are
trying to merge into) for pull request updates.
For example, --pull-request-pattern=foo will match "foo", "foobar", and "barfoo".

The syntax of the regular expressions accepted is the syntax accepted by
RE2 and described at https://github.com/google/re2/wiki/Syntax.
""")
    comment_control_choices = {
        'COMMENTS_DISABLED': """Do not require comments on Pull Requests before builds are triggered.""",
        'COMMENTS_ENABLED': """Enforce that repository owners or collaborators must comment on Pull Requests before builds are triggered.""",
        'COMMENTS_ENABLED_FOR_EXTERNAL_CONTRIBUTORS_ONLY': """Enforce that repository owners or collaborators must comment on external contributors' Pull Requests before builds are triggered.""",
    }

    pr_config.add_argument(
        '--comment-control',
        choices=comment_control_choices,
        default='COMMENTS_ENABLED',
        help=("""\
Require a repository collaborator or owner to comment '/gcbrun' on a pull
request before running the build.
"""),
    )

    trigger_utils.AddBuildConfigArgs(flag_config)
    trigger_utils.AddRepoEventArgs(flag_config)
    trigger_utils.AddIncludeLogsArgs(flag_config)

  def ParseTriggerFromFlags(self, args):
    """Parses command line arguments into a build trigger.

    Args:
      args: An argparse arguments object.

    Returns:
      A build trigger object.

    Raises:
      RequiredArgumentException: If comment_control is defined but
      pull_request_pattern isn't.
    """
    project = properties.VALUES.core.project.Get(required=True)
    messages = cloudbuild_util.GetMessagesModule()

    trigger, done = trigger_utils.ParseTriggerArgs(args, messages)
    if done:
      return trigger

    if args.repo_owner and args.repo_name:  # 1st-gen GitHub config
      trigger.github = messages.GitHubEventsConfig(
          owner=args.repo_owner,
          name=args.repo_name,
          enterpriseConfigResourceName=args.enterprise_config)
      rcfg = trigger.github
    else:  # 2nd-gen (Repos API) config
      trigger.repositoryEventConfig = messages.RepositoryEventConfig(
          repository=args.repository)
      rcfg = trigger.repositoryEventConfig

    if args.pull_request_pattern:
      rcfg.pullRequest = messages.PullRequestFilter(
          branch=args.pull_request_pattern)
      if args.comment_control:
        rcfg.pullRequest.commentControl = (
            messages.PullRequestFilter.CommentControlValueValuesEnum(
                args.comment_control
            )
        )
    else:
      # Push event
      rcfg.push = messages.PushFilter(
          branch=args.branch_pattern, tag=args.tag_pattern)

    default_image = 'gcr.io/%s/github.com/%s/%s:$COMMIT_SHA' % (
        project, args.repo_owner, args.repo_name)
    trigger_utils.ParseBuildConfigArgs(trigger, args, messages, default_image)
    trigger_utils.ParseRepoEventArgs(trigger, args)
    trigger_utils.ParseIncludeLogsWithStatus(trigger, args, messages)

    return trigger

  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:
      Some value that we want to have printed later.
    """

    client = cloudbuild_util.GetClientInstance()
    messages = cloudbuild_util.GetMessagesModule()

    trigger = self.ParseTriggerFromFlags(args)

    # Send the Create request
    project = properties.VALUES.core.project.Get(required=True)
    regionprop = properties.VALUES.builds.region.Get()
    location = args.region or regionprop or cloudbuild_util.DEFAULT_REGION
    parent = resources.REGISTRY.Create(
        collection='cloudbuild.projects.locations',
        projectsId=project,
        locationsId=location).RelativeName()
    created_trigger = client.projects_locations_triggers.Create(
        messages.CloudbuildProjectsLocationsTriggersCreateRequest(
            parent=parent, buildTrigger=trigger))

    trigger_resource = resources.REGISTRY.Parse(
        None,
        collection='cloudbuild.projects.locations.triggers',
        api_version='v1',
        params={
            'projectsId': project,
            'locationsId': location,
            'triggersId': created_trigger.id,
        })
    log.CreatedResource(trigger_resource)

    return created_trigger
