import os
import socket
import atexit
import tempfile
from http.client import HTTPConnection

import pytest

import cherrypy
from cherrypy.test import helper


def usocket_path():
    fd, path = tempfile.mkstemp('cp_test.sock')
    os.close(fd)
    os.remove(path)
    return path


USOCKET_PATH = usocket_path()


class USocketHTTPConnection(HTTPConnection):
    """
    HTTPConnection over a unix socket.
    """

    def __init__(self, path):
        HTTPConnection.__init__(self, 'localhost')
        self.path = path

    def __call__(self, *args, **kwargs):
        """
        Catch-all method just to present itself as a constructor for the
        HTTPConnection.
        """
        return self

    def connect(self):
        """
        Override the connect method and assign a unix socket as a transport.
        """
        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        sock.connect(self.path)
        self.sock = sock
        atexit.register(lambda: os.remove(self.path))


@pytest.mark.skipif("sys.platform == 'win32'")
class WSGI_UnixSocket_Test(helper.CPWebCase):
    """
    Test basic behavior on a cherrypy wsgi server listening
    on a unix socket.

    It exercises the config option `server.socket_file`.
    """
    HTTP_CONN = USocketHTTPConnection(USOCKET_PATH)

    @staticmethod
    def setup_server():
        class Root(object):

            @cherrypy.expose
            def index(self):
                return 'Test OK'

            @cherrypy.expose
            def error(self):
                raise Exception('Invalid page')

        config = {
            'server.socket_file': USOCKET_PATH
        }
        cherrypy.config.update(config)
        cherrypy.tree.mount(Root())

    def tearDown(self):
        cherrypy.config.update({'server.socket_file': None})

    def test_simple_request(self):
        self.getPage('/')
        self.assertStatus('200 OK')
        self.assertInBody('Test OK')

    def test_not_found(self):
        self.getPage('/invalid_path')
        self.assertStatus('404 Not Found')

    def test_internal_error(self):
        self.getPage('/error')
        self.assertStatus('500 Internal Server Error')
        self.assertInBody('Invalid page')