from os import stat
from os.path import exists
from stat import S_ISFIFO

import pytest

from echo_server import EchoPipeIOServer


@pytest.fixture
def pipe_io():
    pipe_server = EchoPipeIOServer()
    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',
        'cheese',
        'You ever wonder why we are here?',
        'Lorem ipsum dolor sit amet',
        'You always have a plan, Dutch!'
    ]
)
def test_echo_server(pipe_io, test_data):
    File(pipe_io.in_pipe).write(test_data)
    assert File(pipe_io.out_pipe).read() == test_data


class File:
    def __init__(self, path):
        self.path = path

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

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