# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import mock
from future.tests.base import unittest

from mobly.controllers.android_device_lib import callback_handler
from mobly.controllers.android_device_lib import jsonrpc_client_base

MOCK_CALLBACK_ID = "1-0"
MOCK_RAW_EVENT = {
  'callbackId': '2-1',
  'name': 'AsyncTaskResult',
  'time': 20460228696,
  'data': {
    'exampleData': "Here's a simple event.",
    'successful': True,
    'secretNumber': 12
  }
}


class CallbackHandlerTest(unittest.TestCase):
  """Unit tests for mobly.controllers.android_device_lib.callback_handler.
  """

  def test_timeout_value(self):
    self.assertGreaterEqual(jsonrpc_client_base._SOCKET_READ_TIMEOUT,
                callback_handler.MAX_TIMEOUT)

  def test_callback_id_property(self):
    mock_event_client = mock.Mock()
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())
    self.assertEqual(handler.callback_id, MOCK_CALLBACK_ID)
    with self.assertRaisesRegex(AttributeError, "can't set attribute"):
      handler.callback_id = 'ha'

  def test_event_dict_to_snippet_event(self):
    mock_event_client = mock.Mock()
    mock_event_client.eventWaitAndGet = mock.Mock(
      return_value=MOCK_RAW_EVENT)
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())
    event = handler.waitAndGet('ha')
    self.assertEqual(event.name, MOCK_RAW_EVENT['name'])
    self.assertEqual(event.creation_time, MOCK_RAW_EVENT['time'])
    self.assertEqual(event.data, MOCK_RAW_EVENT['data'])
    self.assertEqual(event.callback_id, MOCK_RAW_EVENT['callbackId'])

  def test_wait_and_get_timeout(self):
    mock_event_client = mock.Mock()
    java_timeout_msg = ('com.google.android.mobly.snippet.event.'
              'EventSnippet$EventSnippetException: timeout.')
    mock_event_client.eventWaitAndGet = mock.Mock(
      side_effect=jsonrpc_client_base.ApiError(mock.Mock(),
                           java_timeout_msg))
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())
    expected_msg = 'Timed out after waiting .*s for event "ha" .*'
    with self.assertRaisesRegex(callback_handler.TimeoutError,
                  expected_msg):
      handler.waitAndGet('ha')

  def test_wait_for_event(self):
    mock_event_client = mock.Mock()
    mock_event_client.eventWaitAndGet = mock.Mock(
      return_value=MOCK_RAW_EVENT)
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())

    def some_condition(event):
      return event.data['successful']

    event = handler.waitForEvent('AsyncTaskResult', some_condition, 0.01)

  def test_wait_for_event_negative(self):
    mock_event_client = mock.Mock()
    mock_event_client.eventWaitAndGet = mock.Mock(
      return_value=MOCK_RAW_EVENT)
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())
    expected_msg = (
      'Timed out after 0.01s waiting for an "AsyncTaskResult" event that'
      ' satisfies the predicate "some_condition".')

    def some_condition(event):
      return False

    with self.assertRaisesRegex(callback_handler.TimeoutError,
                  expected_msg):
      handler.waitForEvent('AsyncTaskResult', some_condition, 0.01)

  def test_wait_for_event_max_timeout(self):
    """waitForEvent should not raise the timeout exceed threshold error.
    """
    mock_event_client = mock.Mock()
    mock_event_client.eventWaitAndGet = mock.Mock(
      return_value=MOCK_RAW_EVENT)
    handler = callback_handler.CallbackHandler(
      callback_id=MOCK_CALLBACK_ID,
      event_client=mock_event_client,
      ret_value=None,
      method_name=None,
      ad=mock.Mock())

    def some_condition(event):
      return event.data['successful']

    big_timeout = callback_handler.MAX_TIMEOUT * 2
    # This line should not raise.
    event = handler.waitForEvent(
      'AsyncTaskResult', some_condition, timeout=big_timeout)


if __name__ == "__main__":
  unittest.main()