"""Tests for kernel connection utilities"""

# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.

import json
import os

import nose.tools as nt

from IPython.config import Config
from IPython.consoleapp import IPythonConsoleApp
from IPython.core.application import BaseIPythonApplication
from IPython.utils.tempdir import TemporaryDirectory, TemporaryWorkingDirectory
from IPython.utils.py3compat import str_to_bytes
from jupyter_client import connect
from jupyter_client.session import Session


class DummyConsoleApp(BaseIPythonApplication, IPythonConsoleApp):
    def initialize(self, argv=[]):
        BaseIPythonApplication.initialize(self, argv=argv)
        self.init_connection_file()

sample_info = dict(ip='1.2.3.4', transport='ipc',
        shell_port=1, hb_port=2, iopub_port=3, stdin_port=4, control_port=5,
        key=b'abc123', signature_scheme='hmac-md5',
    )

def test_write_connection_file():
    with TemporaryDirectory() as d:
        cf = os.path.join(d, 'kernel.json')
        connect.write_connection_file(cf, **sample_info)
        nt.assert_true(os.path.exists(cf))
        with open(cf, 'r') as f:
            info = json.load(f)
    info['key'] = str_to_bytes(info['key'])
    nt.assert_equal(info, sample_info)


def test_load_connection_file_session():
    """test load_connection_file() after """
    session = Session()
    app = DummyConsoleApp(session=Session())
    app.initialize(argv=[])
    session = app.session

    with TemporaryDirectory() as d:
        cf = os.path.join(d, 'kernel.json')
        connect.write_connection_file(cf, **sample_info)
        app.connection_file = cf
        app.load_connection_file()

    nt.assert_equal(session.key, sample_info['key'])
    nt.assert_equal(session.signature_scheme, sample_info['signature_scheme'])


def test_app_load_connection_file():
    """test `ipython console --existing` loads a connection file"""
    with TemporaryDirectory() as d:
        cf = os.path.join(d, 'kernel.json')
        connect.write_connection_file(cf, **sample_info)
        app = DummyConsoleApp(connection_file=cf)
        app.initialize(argv=[])

    for attr, expected in sample_info.items():
        if attr in ('key', 'signature_scheme'):
            continue
        value = getattr(app, attr)
        nt.assert_equal(value, expected, "app.%s = %s != %s" % (attr, value, expected))


def test_find_connection_file():
    cfg = Config()
    with TemporaryDirectory() as d:
        cfg.ProfileDir.location = d
        cf = 'kernel.json'
        app = DummyConsoleApp(config=cfg, connection_file=cf)
        app.initialize()

        security_dir = os.path.join(app.profile_dir.location, 'security')
        profile_cf = os.path.join(security_dir, cf)

        with open(profile_cf, 'w') as f:
            f.write("{}")

        for query in (
            'kernel.json',
            'kern*',
            '*ernel*',
            'k*',
            ):
            nt.assert_equal(connect.find_connection_file(query, path=security_dir), profile_cf)

        BaseIPythonApplication._instance = None