#!/usr/bin/env python3
"""A tool to delete permalinks and traces behind them.

To be used by the Perfetto team, who has write access to the GCS bucket.
"""

import json
import logging
import re
import subprocess
import sys

from typing import List

GCS_BUCKET = 'perfetto-ui-data'
GCS_HTTP = 'https://storage.googleapis.com/%s/' % GCS_BUCKET


def delete_gcs_obj(url: str, gcs_delete_list: List[str]):
  if not url.startswith(GCS_HTTP):
    logging.error('The URL %s should start with %s', url, GCS_HTTP)
    return
  gs_url = 'gs://%s/%s' % (GCS_BUCKET, url[len(GCS_HTTP):])
  gcs_delete_list.append(gs_url)


def delete_permalink_uuid(uuid: str, gcs_delete_list: List[str]):
  state_url = GCS_HTTP + uuid
  delete_gcs_obj(state_url, gcs_delete_list)
  state_json = subprocess.check_output(['curl', '-Ls', state_url])
  state = json.loads(state_json)
  trace_url = state['engine']['source']['url']
  delete_gcs_obj(trace_url, gcs_delete_list)


def main():
  gcs_delete_list = []
  if sys.stdin.isatty():
    logging.warn(
        'This tool expects a list of uuids or https://ui.perfetto.dev/#!#?s=deadbeef'
    )

  for line in sys.stdin.readlines():
    line = line.strip()
    m = re.match(r'.*?\b([a-f0-9]{64})', line)
    if not m:
      logging.error('Could not find a 64 hex UUID from %s', line)
      continue
    uuid = m.group(1)
    delete_permalink_uuid(uuid, gcs_delete_list)

  if len(gcs_delete_list) == 0:
    logging.info('No object to delete, quitting without taking any action')
    return 0

  print('Removing the following objects:')
  for gs_uri in gcs_delete_list:
    print('  ', gs_uri)
  subprocess.check_call(['gsutil', '-m', 'rm', '-f', '-a'] + gcs_delete_list)


if __name__ == '__main__':
  sys.exit(main())