#!/usr/bin/env python3

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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 os
import requests
import subprocess
import sys

if len(sys.argv) != 5:
  sys.stderr.write('usage: program <github-username> <previous-release-commit> <new-release-commit> <milestone-number-to-tag>\n')
  sys.stderr.write("  e.g., program myusername 75c70c2ccc 29f3a328da 30\n")
  sys.stderr.write("  e.g., The milestone number for Druid 30 is 56, since the milestone has the url https://github.com/apache/druid/milestone/56\n")
  sys.stderr.write("  It is also necessary to set a GIT_TOKEN environment variable containing a personal access token.\n")
  sys.exit(1)

expected_apache_html_url_prefix = "https://github.com/apache/druid/pull/"

github_username = sys.argv[1]
previous_release_commit = sys.argv[2]
new_release_commit = sys.argv[3]
milestone = sys.argv[4]
milestone_json = {'milestone': milestone}

# Find all commits between that commit and the current release branch
command = "git rev-list {}..{}".format(previous_release_commit, new_release_commit)
all_commits = subprocess.check_output(command, shell=True).decode('UTF-8')

for sha in all_commits.splitlines():
  try:
    url = "https://api.github.com/repos/apache/druid/commits/{}/pulls".format(sha)
    headers = {'Accept': 'application/vnd.github.groot-preview+json'}
    pull_requests = requests.get(url, headers=headers, auth=(github_username, os.environ["GIT_TOKEN"])).json()

    print("Retrieved {} pull requests associated to commit {}".format(len(pull_requests), sha))
    for pr in pull_requests:
      pr_number = pr['number']
      if expected_apache_html_url_prefix not in pr['html_url']:
        print("Skipping Pull Request {} associatd with commit {} since the PR is not from the Apache repo.".format(pr_number, sha))
        continue
      if pr['milestone'] is None:
        print("Tagging Pull Request {} with milestone {}".format(pr_number, milestone))
        url = "https://api.github.com/repos/apache/druid/issues/{}".format(pr_number)
        requests.patch(url, json=milestone_json, auth=(github_username, os.environ["GIT_TOKEN"]))
      else:
        print("Skipping Pull Request {} since it's already tagged with milestone {}".format(pr_number, pr['milestone']['number']))

  except Exception as e:
    print("Got exception for commit: {}  ex: {}".format(sha, e))
    continue