# pylint: disable=redefined-outer-name
from os import stat, urandom
from os.path import exists, dirname, realpath, join
from stat import S_ISFIFO
from secrets import token_urlsafe

import pytest

from echo_server import EchoPipeIOServer


@pytest.fixture
def pipe_io():
    here = dirname(realpath(__file__))
    pipe_server = EchoPipeIOServer(
        join(here, 'in_pipe_tests'),
        join(here, 'out_pipe_tests')
    )
    pipe_server.run()
    yield pipe_server
    pipe_server.stop()


def test_pipes_exist(pipe_io):
    for path in (pipe_io.in_pipe, pipe_io.out_pipe):
        assert exists(path)


def test_pipes_isfifo(pipe_io):
    for path in (pipe_io.in_pipe, pipe_io.out_pipe):
        assert S_ISFIFO(stat(path).st_mode)


@pytest.mark.parametrize(
    'test_data', [
        'Cats and cheese',
        'You ever wonder why we are here?',
        'Lorem ipsum dolor sit amet',
        'You always have a plan, Dutch!',
        token_urlsafe(32),
        token_urlsafe(32),
        token_urlsafe(32),
        token_urlsafe(32)
    ]
)
def test_io(pipe_io, test_data):
    File(pipe_io.in_pipe, string=True).write(test_data)
    assert File(pipe_io.out_pipe, string=True).read() == test_data


@pytest.mark.parametrize(
    'test_data_size', [
        1024,
        1024*1024,
        2*1024*1024,
        4*1024*1024,
        8*1024*1024,
        16*1024*1024,
        32*1024*1024
    ]
)
def test_io_large_data(pipe_io, test_data_size):
    random_data = urandom(test_data_size)
    File(pipe_io.in_pipe).write(random_data)
    assert File(pipe_io.out_pipe).read() == random_data


def test_stop_removes_pipes(pipe_io):
    pipe_io.stop()
    for path in (pipe_io.in_pipe, pipe_io.out_pipe):
        assert not exists(path)


class File:
    def __init__(self, path, string=False):
        self.path = path
        self._filemode = '' if string else 'b'

    def write(self, what):
        with open(self.path, f'w{self._filemode}') as ofile:
            ofile.write(what)

    def read(self):
        with open(self.path, f'r{self._filemode}') as ifile:
            return ifile.read()