import os
import subprocess

import psutil

from catfish.utils import processes
from tests import BaseTestCase


class RootProcessTestCase(BaseTestCase):
    def test_root_processes(self):
        root_process = processes.get_root_process()
        self.assertIsNone(root_process.parent())
        all_children = [proc.pid for proc in root_process.children(recursive=True)]
        self.assertIn(os.getpid(), all_children)

    def test_current_process(self):
        self.assertEqual(processes.CURRENT_PROCESS.pid, os.getpid())


class TerminateProcessesTestCase(BaseTestCase):
    def test_kills_lots_of_processes(self):
        created_processes = []
        for _ in range(10):
            created_processes.append(subprocess.Popen("yes", stdout=subprocess.PIPE))

        for proc in created_processes:
            self.assertIsNone(proc.poll())

        still_alive = processes.terminate_processes(
            [psutil.Process(proc.pid) for proc in created_processes]
        )
        self.assertIsNone(still_alive)
        for proc in created_processes:
            self.assertEqual(proc.poll(), 0)


class RunningProcessTestCase(BaseTestCase):
    def test_current_process_running(self):
        self.assertTrue(processes.is_process_running(os.getpid()))

    def test_root_process_running(self):
        self.assertTrue(processes.is_process_running(processes.get_root_process().pid))

    def test_impossible_running_process(self):
        self.assertFalse(processes.is_process_running(2938420983094892))