# Copyright 2024, The Android Open Source Project
#
# 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.

"""Integration tests for build_test_suites that require a local build env."""

import os
import pathlib
import shutil
import signal
import subprocess
import tempfile
import time
import ci_test_lib


class BuildTestSuitesLocalTest(ci_test_lib.TestCase):

  def setUp(self):
    self.top_dir = pathlib.Path(os.environ['ANDROID_BUILD_TOP']).resolve()
    self.executable = self.top_dir.joinpath('build/make/ci/build_test_suites')
    self.process_session = ci_test_lib.TemporaryProcessSession(self)
    self.temp_dir = ci_test_lib.TestTemporaryDirectory.create(self)

  def build_subprocess_args(self, build_args: list[str]):
    env = os.environ.copy()
    env['TOP'] = str(self.top_dir)
    env['OUT_DIR'] = self.temp_dir

    args = ([self.executable] + build_args,)
    kwargs = {
        'cwd': self.top_dir,
        'env': env,
        'text': True,
    }

    return (args, kwargs)

  def run_build(self, build_args: list[str]) -> subprocess.CompletedProcess:
    args, kwargs = self.build_subprocess_args(build_args)

    return subprocess.run(
        *args,
        **kwargs,
        check=True,
        capture_output=True,
        timeout=5 * 60,
    )

  def assert_children_alive(self, children: list[int]):
    for c in children:
      self.assertTrue(ci_test_lib.process_alive(c))

  def assert_children_dead(self, children: list[int]):
    for c in children:
      self.assertFalse(ci_test_lib.process_alive(c))

  def test_fails_for_invalid_arg(self):
    invalid_arg = '--invalid-arg'

    with self.assertRaises(subprocess.CalledProcessError) as cm:
      self.run_build([invalid_arg])

    self.assertIn(invalid_arg, cm.exception.stderr)

  def test_builds_successfully(self):
    self.run_build(['nothing'])

  def test_can_interrupt_build(self):
    args, kwargs = self.build_subprocess_args(['general-tests'])
    p = self.process_session.create(args, kwargs)

    # TODO(lucafarsi): Replace this (and other instances) with a condition.
    time.sleep(5)  # Wait for the build to get going.
    self.assertIsNone(p.poll())  # Check that the process is still alive.
    children = query_child_pids(p.pid)
    self.assert_children_alive(children)

    p.send_signal(signal.SIGINT)
    p.wait()

    time.sleep(5)  # Wait for things to die out.
    self.assert_children_dead(children)

  def test_can_kill_build_process_group(self):
    args, kwargs = self.build_subprocess_args(['general-tests'])
    p = self.process_session.create(args, kwargs)

    time.sleep(5)  # Wait for the build to get going.
    self.assertIsNone(p.poll())  # Check that the process is still alive.
    children = query_child_pids(p.pid)
    self.assert_children_alive(children)

    os.killpg(os.getpgid(p.pid), signal.SIGKILL)
    p.wait()

    time.sleep(5)  # Wait for things to die out.
    self.assert_children_dead(children)


# TODO(hzalek): Replace this with `psutils` once available in the tree.
def query_child_pids(parent_pid: int) -> set[int]:
  p = subprocess.run(
      ['pgrep', '-P', str(parent_pid)],
      check=True,
      capture_output=True,
      text=True,
  )
  return {int(pid) for pid in p.stdout.splitlines()}


if __name__ == '__main__':
  ci_test_lib.main()