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import unittest
from datetime import timedelta
from unittest.mock import Mock, patch

from airflow.models import DAG, TaskInstance, TaskReschedule
from airflow.ti_deps.dep_context import DepContext
from airflow.ti_deps.deps.ready_to_reschedule import ReadyToRescheduleDep
from airflow.utils.state import State
from airflow.utils.timezone import utcnow


class TestNotInReschedulePeriodDep(unittest.TestCase):
    def _get_task_instance(self, state):
        dag = DAG('test_dag')
        task = Mock(dag=dag, reschedule=True)
        ti = TaskInstance(task=task, state=state, run_id=None)
        return ti

    def _get_task_reschedule(self, reschedule_date):
        task = Mock(dag_id='test_dag', task_id='test_task')
        reschedule = TaskReschedule(
            task=task,
            run_id=None,
            try_number=None,
            start_date=reschedule_date,
            end_date=reschedule_date,
            reschedule_date=reschedule_date,
        )
        return reschedule

    def test_should_pass_if_ignore_in_reschedule_period_is_set(self):
        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        dep_context = DepContext(ignore_in_reschedule_period=True)
        assert ReadyToRescheduleDep().is_met(ti=ti, dep_context=dep_context)

    def test_should_pass_if_not_reschedule_mode(self):
        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        del ti.task.reschedule
        assert ReadyToRescheduleDep().is_met(ti=ti)

    def test_should_pass_if_not_in_none_state(self):
        ti = self._get_task_instance(State.UP_FOR_RETRY)
        assert ReadyToRescheduleDep().is_met(ti=ti)

    @patch('airflow.models.taskreschedule.TaskReschedule.query_for_task_instance')
    def test_should_pass_if_no_reschedule_record_exists(self, mock_query_for_task_instance):
        mock_query_for_task_instance.return_value.with_entities.return_value.first.return_value = []
        ti = self._get_task_instance(State.NONE)
        assert ReadyToRescheduleDep().is_met(ti=ti)

    @patch('airflow.models.taskreschedule.TaskReschedule.query_for_task_instance')
    def test_should_pass_after_reschedule_date_one(self, mock_query_for_task_instance):
        mock_query_for_task_instance.return_value.with_entities.return_value.first.return_value = (
            self._get_task_reschedule(utcnow() - timedelta(minutes=1))
        )
        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        assert ReadyToRescheduleDep().is_met(ti=ti)

    @patch('airflow.models.taskreschedule.TaskReschedule.query_for_task_instance')
    def test_should_pass_after_reschedule_date_multiple(self, mock_query_for_task_instance):
        mock_query_for_task_instance.return_value.with_entities.return_value.first.return_value = [
            self._get_task_reschedule(utcnow() - timedelta(minutes=21)),
            self._get_task_reschedule(utcnow() - timedelta(minutes=11)),
            self._get_task_reschedule(utcnow() - timedelta(minutes=1)),
        ][-1]
        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        assert ReadyToRescheduleDep().is_met(ti=ti)

    @patch('airflow.models.taskreschedule.TaskReschedule.query_for_task_instance')
    def test_should_fail_before_reschedule_date_one(self, mock_query_for_task_instance):
        mock_query_for_task_instance.return_value.with_entities.return_value.first.return_value = (
            self._get_task_reschedule(utcnow() + timedelta(minutes=1))
        )

        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        assert not ReadyToRescheduleDep().is_met(ti=ti)

    @patch('airflow.models.taskreschedule.TaskReschedule.query_for_task_instance')
    def test_should_fail_before_reschedule_date_multiple(self, mock_query_for_task_instance):
        mock_query_for_task_instance.return_value.with_entities.return_value.first.return_value = [
            self._get_task_reschedule(utcnow() - timedelta(minutes=19)),
            self._get_task_reschedule(utcnow() - timedelta(minutes=9)),
            self._get_task_reschedule(utcnow() + timedelta(minutes=1)),
        ][-1]
        ti = self._get_task_instance(State.UP_FOR_RESCHEDULE)
        assert not ReadyToRescheduleDep().is_met(ti=ti)
