#!/usr/bin/env python3

import json
import sys

import requests

# tested with python 3.6 and requests 2.13.0

if len(sys.argv) != 2:
  sys.stderr.write('usage: program <milestone-number>\n')
  sys.stderr.write('Provide the github milestone number, not name. (e.g., 19 instead of 0.10.1)\n')
  sys.exit(1)

milestone_num = sys.argv[1]

done = False
page_counter = 1
contributors = set()

# Get all users who created a closed issue or merged PR for a given milestone
while not done:
  resp = requests.get("https://api.github.com/repos/apache/incubator-druid/issues?milestone=%s&state=closed&page=%s" % (milestone_num, page_counter))
  pagination_link = resp.headers["Link"]

  # last page doesn't have a "next"
  if "rel=\"next\"" not in pagination_link:
    done = True
  else:
    page_counter += 1

  issues = json.loads(resp.text)
  for issue in issues:
    contributor_name = issue["user"]["login"]
    contributors.add(contributor_name)

# doesn't work as-is for python2, the contributor names are "unicode" instead of "str" in python2
contributors = sorted(contributors, key=str.lower)
for contributor_name in contributors:
  print("@%s" % contributor_name)