import functools
import os
import shutil
import subprocess
import time
from pathlib import Path
from unittest import TestCase

import psutil
from aiohttp.test_utils import AioHTTPTestCase, unused_port
from aiounittest import AsyncTestCase
from click.testing import CliRunner

from catfish.__main__ import cli
from catfish.router import get_server
from catfish.utils.processes import (
    get_root_process,
    terminate_processes,
    terminate_subprocesses,
)
from catfish.utils.sockets import create_base_socket_dir, delete_base_socket_dir
from catfish.worker.server import WORKER_SERVER_SOCKET


class BaseTestCase(TestCase):
    TESTS_DIR = Path(os.path.dirname(__file__))
    EXAMPLE_DIR = TESTS_DIR.parent.joinpath("example")
    DUMMY_EXE = EXAMPLE_DIR.joinpath("src", "dummy_program.py")

    def setUp(self):
        create_base_socket_dir()
        self.cli_runner = CliRunner()
        self.cli = cli
        self.run_cli = functools.partial(self.cli_runner.invoke, self.cli)

    def terminate_dummy_processes(self):
        dummy_processes = []
        for process in get_root_process().children(recursive=True):
            try:
                if str(self.DUMMY_EXE) in " ".join(process.cmdline()):
                    dummy_processes.append(process)
            except psutil.NoSuchProcess:
                continue
        terminate_processes(dummy_processes)

    def tearDown(self):
        terminate_subprocesses()
        self.terminate_dummy_processes()
        delete_base_socket_dir()


class BaseWorkerTestCase(BaseTestCase):
    def setUp(self):
        super().setUp()
        self.unused_port = unused_port()
        self.worker_process = subprocess.Popen(
            [
                shutil.which("ctf"),
                "start",
                "--port",
                str(self.unused_port),
                "--no-fork",
            ],
            universal_newlines=True,
        )
        while not WORKER_SERVER_SOCKET.exists():
            time.sleep(0.1)

    def tearDown(self):
        terminate_subprocesses(psutil.Process(self.worker_process.pid))
        self.worker_process.terminate()
        self.worker_process.wait()
        super().tearDown()


class BaseRouterTestCase(AsyncTestCase, AioHTTPTestCase):
    async def get_application(self):
        return get_server()

    def __getattribute__(self, name):
        attr = super(AioHTTPTestCase, self).__getattribute__(name)
        if name.startswith("test_") and callable(attr):
            return lambda: self.loop.run_until_complete(attr())
        else:
            return attr