"""Tests for the notebook kernel and session manager."""

from subprocess import PIPE
import time
from unittest import TestCase

from ipython_genutils.testing import decorators as dec

from traitlets.config.loader import Config
from ..localinterfaces import localhost
from jupyter_client import KernelManager
from jupyter_client.multikernelmanager import MultiKernelManager

class TestKernelManager(TestCase):

    def _get_tcp_km(self):
        c = Config()
        km = MultiKernelManager(config=c)
        return km

    def _get_ipc_km(self):
        c = Config()
        c.KernelManager.transport = 'ipc'
        c.KernelManager.ip = 'test'
        km = MultiKernelManager(config=c)
        return km

    def _run_lifecycle(self, km):
        kid = km.start_kernel(stdout=PIPE, stderr=PIPE)
        self.assertTrue(km.is_alive(kid))
        self.assertTrue(kid in km)
        self.assertTrue(kid in km.list_kernel_ids())
        self.assertEqual(len(km),1)
        km.restart_kernel(kid, now=True)
        self.assertTrue(km.is_alive(kid))
        self.assertTrue(kid in km.list_kernel_ids())
        km.interrupt_kernel(kid)
        k = km.get_kernel(kid)
        self.assertTrue(isinstance(k, KernelManager))
        km.shutdown_kernel(kid, now=True)
        self.assertTrue(not kid in km)

    def _run_cinfo(self, km, transport, ip):
        kid = km.start_kernel(stdout=PIPE, stderr=PIPE)
        k = km.get_kernel(kid)
        cinfo = km.get_connection_info(kid)
        self.assertEqual(transport, cinfo['transport'])
        self.assertEqual(ip, cinfo['ip'])
        self.assertTrue('stdin_port' in cinfo)
        self.assertTrue('iopub_port' in cinfo)
        stream = km.connect_iopub(kid)
        stream.close()
        self.assertTrue('shell_port' in cinfo)
        stream = km.connect_shell(kid)
        stream.close()
        self.assertTrue('hb_port' in cinfo)
        stream = km.connect_hb(kid)
        stream.close()
        km.shutdown_kernel(kid, now=True)

    def test_tcp_lifecycle(self):
        km = self._get_tcp_km()
        self._run_lifecycle(km)

    def test_shutdown_all(self):
        km = self._get_tcp_km()
        kid = km.start_kernel(stdout=PIPE, stderr=PIPE)
        self.assertIn(kid, km)
        km.shutdown_all()
        self.assertNotIn(kid, km)
        # shutdown again is okay, because we have no kernels
        km.shutdown_all()

    def test_tcp_cinfo(self):
        km = self._get_tcp_km()
        self._run_cinfo(km, 'tcp', localhost())

    @dec.skip_win32
    def test_ipc_lifecycle(self):
        km = self._get_ipc_km()
        self._run_lifecycle(km)

    @dec.skip_win32
    def test_ipc_cinfo(self):
        km = self._get_ipc_km()
        self._run_cinfo(km, 'ipc', 'test')
