import json
import shutil
import tempfile
import unittest

from mysos.common import pkgutil
from mysos.scheduler.http import MysosServer
from mysos.scheduler.scheduler import MysosScheduler

import pytest
from webtest import AppError, TestApp


MYSOS_MODULE = 'mysos.scheduler'
ASSET_RELPATH = 'assets'


class FakeScheduler(object):
  def __init__(self):
    self._exception = None
    self._response = None

  def set_exception(self, exception):
    self._exception = exception

  def set_response(self, response):
    self._response = response

  def create_cluster(self, cluster_name, cluster_user, num_nodes, backup_id=None):
    if self._exception:
      raise self._exception
    return self._response


class TestHTTP(unittest.TestCase):
  @classmethod
  def setUpClass(cls):
    cls.web_assets_dir = tempfile.mkdtemp()
    pkgutil.unpack_assets(cls.web_assets_dir, MYSOS_MODULE, ASSET_RELPATH)

  @classmethod
  def tearDownClass(cls):
    shutil.rmtree(cls.web_assets_dir)

  def setUp(self):
    self._scheduler = FakeScheduler()
    self._app = TestApp(MysosServer(self._scheduler, self.web_assets_dir).app)

  def test_create_cluster_successful(self):
    response = ('test_cluster_url', 'passwordfortestcluster')
    self._scheduler.set_response(response)
    body = self._app.post(
        '/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'}).normal_body
    assert json.loads(body) == dict(cluster_url=response[0], cluster_password=response[1])

  def test_create_cluster_exists(self):
    self._scheduler.set_exception(MysosScheduler.ClusterExists())

    with pytest.raises(AppError) as e:
      assert self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
    assert e.value.message.startswith('Bad response: 409')

  def test_create_cluster_value_error(self):
    self._scheduler.set_exception(ValueError())
    with pytest.raises(AppError) as e:
      self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
    assert e.value.message.startswith('Bad response: 400')

  def test_create_cluster_invalid_user(self):
    self._scheduler.set_exception(MysosScheduler.InvalidUser())
    with pytest.raises(AppError) as e:
      self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
    assert e.value.message.startswith('Bad response: 400')