"""Test NotebookApp"""

import getpass
import logging
import os
import re
import signal
from subprocess import Popen, PIPE, STDOUT
import sys
from tempfile import NamedTemporaryFile

try:
    from unittest.mock import patch
except ImportError:
    from mock import patch # py2

import nose.tools as nt

from traitlets.tests.utils import check_help_all_output

from jupyter_core.application import NoStart
from ipython_genutils.tempdir import TemporaryDirectory
from traitlets import TraitError
from notebook import notebookapp, __version__
from notebook.auth.security import passwd_check
NotebookApp = notebookapp.NotebookApp

from .launchnotebook import NotebookTestBase


def test_help_output():
    """ipython notebook --help-all works"""
    check_help_all_output('notebook')

def test_server_info_file():
    td = TemporaryDirectory()
    nbapp = NotebookApp(runtime_dir=td.name, log=logging.getLogger())
    def get_servers():
        return list(notebookapp.list_running_servers(nbapp.runtime_dir))
    nbapp.initialize(argv=[])
    nbapp.write_server_info_file()
    servers = get_servers()
    nt.assert_equal(len(servers), 1)
    nt.assert_equal(servers[0]['port'], nbapp.port)
    nt.assert_equal(servers[0]['url'], nbapp.connection_url)
    nbapp.remove_server_info_file()
    nt.assert_equal(get_servers(), [])

    # The ENOENT error should be silenced.
    nbapp.remove_server_info_file()

def test_nb_dir():
    with TemporaryDirectory() as td:
        app = NotebookApp(notebook_dir=td)
        nt.assert_equal(app.notebook_dir, td)

def test_no_create_nb_dir():
    with TemporaryDirectory() as td:
        nbdir = os.path.join(td, 'notebooks')
        app = NotebookApp()
        with nt.assert_raises(TraitError):
            app.notebook_dir = nbdir

def test_missing_nb_dir():
    with TemporaryDirectory() as td:
        nbdir = os.path.join(td, 'notebook', 'dir', 'is', 'missing')
        app = NotebookApp()
        with nt.assert_raises(TraitError):
            app.notebook_dir = nbdir

def test_invalid_nb_dir():
    with NamedTemporaryFile() as tf:
        app = NotebookApp()
        with nt.assert_raises(TraitError):
            app.notebook_dir = tf

def test_nb_dir_with_slash():
    with TemporaryDirectory(suffix="_slash" + os.sep) as td:
        app = NotebookApp(notebook_dir=td)
        nt.assert_false(app.notebook_dir.endswith(os.sep))

def test_nb_dir_root():
    root = os.path.abspath(os.sep) # gets the right value on Windows, Posix
    app = NotebookApp(notebook_dir=root)
    nt.assert_equal(app.notebook_dir, root)

def test_generate_config():
    with TemporaryDirectory() as td:
        app = NotebookApp(config_dir=td)
        app.initialize(['--generate-config', '--allow-root'])
        with nt.assert_raises(NoStart):
            app.start()
        assert os.path.exists(os.path.join(td, 'jupyter_notebook_config.py'))

#test if the version testin function works
def test_pep440_version():

    for version in [
        '4.1.0.b1',
        '4.1.b1',
        '4.2',
        'X.y.z',
        '1.2.3.dev1.post2',
        ]:
        def loc():
            with nt.assert_raises(ValueError):
                raise_on_bad_version(version)
        yield loc

    for version in [
        '4.1.1',
        '4.2.1b3',
        ]:

        yield (raise_on_bad_version, version)



pep440re = re.compile('^(\d+)\.(\d+)\.(\d+((a|b|rc)\d+)?)(\.post\d+)?(\.dev\d*)?$')

def raise_on_bad_version(version):
    if not pep440re.match(version):
        raise ValueError("Versions String does apparently not match Pep 440 specification, "
                         "which might lead to sdist and wheel being seen as 2 different release. "
                         "E.g: do not use dots for beta/alpha/rc markers.")


def test_current_version():
    raise_on_bad_version(__version__)

def test_notebook_password():
    password = 'secret'
    with TemporaryDirectory() as td:
        with patch.dict('os.environ', {
            'JUPYTER_CONFIG_DIR': td,
        }), patch.object(getpass, 'getpass', return_value=password):
            app = notebookapp.NotebookPasswordApp(log_level=logging.ERROR)
            app.initialize([])
            app.start()
            nb = NotebookApp()
            nb.load_config_file()
            nt.assert_not_equal(nb.password, '')
            passwd_check(nb.password, password)

class TestingStopApp(notebookapp.NbserverStopApp):
    """For testing the logic of NbserverStopApp."""
    def __init__(self, **kwargs):
        super(TestingStopApp, self).__init__(**kwargs)
        self.servers_shut_down = []

    def shutdown_server(self, server):
        self.servers_shut_down.append(server)
        return True

def test_notebook_stop():
    def list_running_servers(runtime_dir):
        for port in range(100, 110):
            yield {
                'pid': 1000 + port,
                'port': port,
                'base_url': '/',
                'hostname': 'localhost',
                'notebook_dir': '/',
                'secure': False,
                'token': '',
                'password': False,
                'url': 'http://localhost:%i' % port,
            }

    mock_servers = patch('notebook.notebookapp.list_running_servers', list_running_servers)

    # test stop with a match
    with mock_servers:
        app = TestingStopApp()
        app.initialize(['105'])
        app.start()
    nt.assert_equal(len(app.servers_shut_down), 1)
    nt.assert_equal(app.servers_shut_down[0]['port'], 105)

    # test no match
    with mock_servers, patch('os.kill') as os_kill:
        app = TestingStopApp()
        app.initialize(['999'])
        with nt.assert_raises(SystemExit) as exc:
            app.start()
        nt.assert_equal(exc.exception.code, 1)
    nt.assert_equal(len(app.servers_shut_down), 0)


class NotebookAppTests(NotebookTestBase):
    def test_list_running_servers(self):
        servers = list(notebookapp.list_running_servers())
        assert len(servers) >= 1
        assert self.port in {info['port'] for info in servers}
