#!/usr/bin/env python3

# Copyright 2022 gRPC authors.
#
# 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.

import os
import re
import subprocess
import sys

from google.cloud import bigquery
import run_buildozer
import update_flakes_query

lookback_hours = 24 * 7 * 4


def include_test(test):
    if '@' in test:
        return False
    if test.startswith("//test/cpp/qps:"):
        return False
    return True


TEST_DIRS = ['test/core', 'test/cpp']
tests = {}
already_flaky = set()
for test_dir in TEST_DIRS:
    for line in subprocess.check_output(
        ['bazel', 'query', 'tests({}/...)'.format(test_dir)]).splitlines():
        test = line.strip().decode('utf-8')
        if not include_test(test):
            continue
        tests[test] = False
for test_dir in TEST_DIRS:
    for line in subprocess.check_output(
        ['bazel', 'query',
         'attr(flaky, 1, tests({}/...))'.format(test_dir)]).splitlines():
        test = line.strip().decode('utf-8')
        if not include_test(test):
            continue
        already_flaky.add(test)

flaky_e2e = set()

client = bigquery.Client()
for row in client.query(
        update_flakes_query.QUERY.format(
            lookback_hours=lookback_hours)).result():
    if row.test_binary not in tests:
        m = re.match(r'^//test/core/end2end:([^@]*)@([^@]*)(.*)',
                     row.test_binary)
        if m:
            flaky_e2e.add('{}@{}{}'.format(m.group(1), m.group(2), m.group(3)))
            print("will mark end2end test {} as flaky".format(row.test_binary))
        else:
            print("skip obsolete test {}".format(row.test_binary))
        continue
    print("will mark {} as flaky".format(row.test_binary))
    tests[row.test_binary] = True

buildozer_commands = []
for test, flaky in sorted(tests.items()):
    if flaky:
        buildozer_commands.append('set flaky True|{}'.format(test))
    elif test in already_flaky:
        buildozer_commands.append('remove flaky|{}'.format(test))

with open('test/core/end2end/flaky.bzl', 'w') as f:
    with open(sys.argv[0]) as my_source:
        for line in my_source:
            if line[0] != '#':
                break
        for line in my_source:
            if line[0] == '#':
                print(line.strip(), file=f)
                break
        for line in my_source:
            if line[0] != '#':
                break
            print(line.strip(), file=f)
    print(
        "\"\"\"A list of flaky tests, consumed by generate_tests.bzl to set flaky attrs.\"\"\"",
        file=f)
    print("FLAKY_TESTS = [", file=f)
    for line in sorted(list(flaky_e2e)):
        print("    \"{}\",".format(line), file=f)
    print("]", file=f)

run_buildozer.run_buildozer(buildozer_commands)