import uuid

import pytest
from flask import g
from freezegun import freeze_time

from app import notify_celery


# requiring notify_api ensures notify_celery.init_app has been called
@pytest.fixture(scope='session')
def celery_task(notify_api):
    @notify_celery.task(name=uuid.uuid4(), base=notify_celery.task_cls)
    def test_task(delivery_info=None): pass
    return test_task


@pytest.fixture
def async_task(celery_task):
    celery_task.push_request(delivery_info={'routing_key': 'test-queue'})
    yield celery_task
    celery_task.pop_request()


@pytest.fixture
def request_id_task(celery_task):
    # Note that each header is a direct attribute of the
    # task context (aka "request").
    celery_task.push_request(notify_request_id='1234')
    yield celery_task
    celery_task.pop_request()


def test_success_should_log_and_call_statsd(mocker, notify_api, async_task):
    statsd = mocker.patch.object(notify_api.statsd_client, 'timing')
    logger = mocker.patch.object(notify_api.logger, 'info')

    with freeze_time() as frozen:
        async_task()
        frozen.tick(5)

        async_task.on_success(
            retval=None, task_id=1234, args=[], kwargs={}
        )

    statsd.assert_called_once_with(f'celery.test-queue.{async_task.name}.success', 5.0)
    logger.assert_called_once_with(f'Celery task {async_task.name} (queue: test-queue) took 5.0000')


def test_success_queue_when_applied_synchronously(mocker, notify_api, celery_task):
    statsd = mocker.patch.object(notify_api.statsd_client, 'timing')
    logger = mocker.patch.object(notify_api.logger, 'info')

    with freeze_time() as frozen:
        celery_task()
        frozen.tick(5)

        celery_task.on_success(
            retval=None, task_id=1234, args=[], kwargs={}
        )

    statsd.assert_called_once_with(f'celery.none.{celery_task.name}.success', 5.0)
    logger.assert_called_once_with(f'Celery task {celery_task.name} (queue: none) took 5.0000')


def test_failure_should_log_and_call_statsd(mocker, notify_api, async_task):
    statsd = mocker.patch.object(notify_api.statsd_client, 'incr')
    logger = mocker.patch.object(notify_api.logger, 'exception')

    async_task.on_failure(
        exc=Exception, task_id=1234, args=[], kwargs={}, einfo=None
    )

    statsd.assert_called_once_with(f'celery.test-queue.{async_task.name}.failure')
    logger.assert_called_once_with(f'Celery task {async_task.name} (queue: test-queue) failed')


def test_failure_queue_when_applied_synchronously(mocker, notify_api, celery_task):
    statsd = mocker.patch.object(notify_api.statsd_client, 'incr')
    logger = mocker.patch.object(notify_api.logger, 'exception')

    celery_task.on_failure(
        exc=Exception, task_id=1234, args=[], kwargs={}, einfo=None
    )

    statsd.assert_called_once_with(f'celery.none.{celery_task.name}.failure')
    logger.assert_called_once_with(f'Celery task {celery_task.name} (queue: none) failed')


def test_call_exports_request_id_from_headers(mocker, request_id_task):
    g = mocker.patch('app.celery.celery.g')
    request_id_task()
    assert g.request_id == '1234'


def test_call_copes_if_request_id_not_in_headers(mocker, celery_task):
    g = mocker.patch('app.celery.celery.g')
    celery_task()
    assert g.request_id is None


def test_send_task_injects_global_request_id_into_headers(mocker, notify_api):
    super_apply = mocker.patch('celery.Celery.send_task')
    g.request_id = '1234'
    notify_celery.send_task('some-task')

    super_apply.assert_called_with(
        'some-task',  # name
        None,  # args
        None,   # kwargs
        headers={'notify_request_id': '1234'}  # other kwargs
    )


def test_send_task_injects_request_id_with_existing_headers(mocker, notify_api):
    super_apply = mocker.patch('celery.Celery.send_task')
    g.request_id = '1234'

    notify_celery.send_task(
        'some-task',
        None,  # args
        None,  # kwargs
        headers={'something': 'else'}  # other kwargs
    )

    super_apply.assert_called_with(
        'some-task',  # name
        None,  # args
        None,  # kwargs
        headers={'notify_request_id': '1234', 'something': 'else'}  # other kwargs
    )


def test_send_task_injects_request_id_with_none_headers(mocker, notify_api):
    super_apply = mocker.patch('celery.Celery.send_task')
    g.request_id = '1234'

    notify_celery.send_task(
        'some-task',
        None,  # args
        None,  # kwargs
        headers=None,  # other kwargs (task retry set headers to "None")
    )

    super_apply.assert_called_with(
        'some-task',  # name
        None,  # args
        None,  # kwargs
        headers={'notify_request_id': '1234'}  # other kwargs
    )


def test_send_task_injects_id_into_kwargs_from_request(mocker, notify_api):
    super_apply = mocker.patch('celery.Celery.send_task')
    request_id_header = notify_api.config['NOTIFY_TRACE_ID_HEADER']
    request_headers = {request_id_header: '1234'}

    with notify_api.test_request_context(headers=request_headers):
        notify_celery.send_task('some-task')

    super_apply.assert_called_with(
        'some-task',  # name
        None,  # args
        None,   # kwargs
        headers={'notify_request_id': '1234'}  # other kwargs
    )