"""Test the kernels service API."""
from tempfile import TemporaryDirectory
import threading

from jupyterlab.labapp import LabApp
from jupyterlab_server.tests.utils import APITester, LabTestBase
from notebook.tests.launchnotebook import assert_http_error


class BuildAPITester(APITester):
    """Wrapper for build REST API requests"""
    url = 'lab/api/build'

    def getStatus(self):
        return self._req('GET', '')

    def build(self):
        return self._req('POST', '')

    def clear(self):
        return self._req('DELETE', '')


class BuildAPITest(LabTestBase):
    """Test the build web service API"""
    Application = LabApp

    def tempdir(self):
        td = TemporaryDirectory()
        self.tempdirs.append(td)
        return td.name

    def setUp(self):
        # Any TemporaryDirectory objects appended to this list will be cleaned
        # up at the end of the test run.
        self.tempdirs = []

        @self.addCleanup
        def cleanup_tempdirs():
            for d in self.tempdirs:
                d.cleanup()

        self.build_api = BuildAPITester(self.request)

    def test_get_status(self):
        """Make sure there are no kernels running at the start"""
        resp = self.build_api.getStatus().json()
        assert 'status' in resp
        assert 'message' in resp

    def test_build(self):
        resp = self.build_api.build()
        assert resp.status_code == 200

    def test_clear(self):
        with assert_http_error(500):
            self.build_api.clear()

        def build_thread():
            with assert_http_error(500):
                self.build_api.build()

        t1 = threading.Thread(target=build_thread)
        t1.start()

        while 1:
            resp = self.build_api.getStatus().json()
            if resp['status'] == 'building':
                break

        resp = self.build_api.clear()
        assert resp.status_code == 204
