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from collections import namedtuple
from datetime import date

import pytest

from airflow.exceptions import AirflowSensorTimeout
from airflow.sensors.python import PythonSensor
from airflow.utils.state import State
from airflow.utils.timezone import datetime
from airflow.utils.types import DagRunType
from tests.operators.test_python import Call, TestPythonBase, build_recording_function

DEFAULT_DATE = datetime(2015, 1, 1)


class TestPythonSensor(TestPythonBase):
    def test_python_sensor_true(self):
        op = PythonSensor(task_id='python_sensor_check_true', python_callable=lambda: True, dag=self.dag)
        op.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE, ignore_ti_state=True)

    def test_python_sensor_false(self):
        op = PythonSensor(
            task_id='python_sensor_check_false',
            timeout=0.01,
            poke_interval=0.01,
            python_callable=lambda: False,
            dag=self.dag,
        )
        with pytest.raises(AirflowSensorTimeout):
            op.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE, ignore_ti_state=True)

    def test_python_sensor_raise(self):
        op = PythonSensor(task_id='python_sensor_check_raise', python_callable=lambda: 1 / 0, dag=self.dag)
        with pytest.raises(ZeroDivisionError):
            op.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE, ignore_ti_state=True)

    def test_python_callable_arguments_are_templatized(self):
        """Test PythonSensor op_args are templatized"""
        recorded_calls = []

        # Create a named tuple and ensure it is still preserved
        # after the rendering is done
        Named = namedtuple('Named', ['var1', 'var2'])
        named_tuple = Named('{{ ds }}', 'unchanged')

        task = PythonSensor(
            task_id='python_sensor',
            timeout=0.01,
            poke_interval=0.3,
            # a Mock instance cannot be used as a callable function or test fails with a
            # TypeError: Object of type Mock is not JSON serializable
            python_callable=build_recording_function(recorded_calls),
            op_args=[4, date(2019, 1, 1), "dag {{dag.dag_id}} ran on {{ds}}.", named_tuple],
            dag=self.dag,
        )

        self.dag.create_dagrun(
            run_type=DagRunType.MANUAL,
            execution_date=DEFAULT_DATE,
            data_interval=(DEFAULT_DATE, DEFAULT_DATE),
            start_date=DEFAULT_DATE,
            state=State.RUNNING,
        )
        with pytest.raises(AirflowSensorTimeout):
            task.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)

        ds_templated = DEFAULT_DATE.date().isoformat()
        self._assert_calls_equal(
            recorded_calls[0],
            Call(
                4,
                date(2019, 1, 1),
                f"dag {self.dag.dag_id} ran on {ds_templated}.",
                Named(ds_templated, 'unchanged'),
            ),
        )

    def test_python_callable_keyword_arguments_are_templatized(self):
        """Test PythonSensor op_kwargs are templatized"""
        recorded_calls = []

        task = PythonSensor(
            task_id='python_sensor',
            timeout=0.01,
            poke_interval=0.01,
            # a Mock instance cannot be used as a callable function or test fails with a
            # TypeError: Object of type Mock is not JSON serializable
            python_callable=build_recording_function(recorded_calls),
            op_kwargs={
                'an_int': 4,
                'a_date': date(2019, 1, 1),
                'a_templated_string': "dag {{dag.dag_id}} ran on {{ds}}.",
            },
            dag=self.dag,
        )

        self.dag.create_dagrun(
            run_type=DagRunType.MANUAL,
            execution_date=DEFAULT_DATE,
            data_interval=(DEFAULT_DATE, DEFAULT_DATE),
            start_date=DEFAULT_DATE,
            state=State.RUNNING,
        )
        with pytest.raises(AirflowSensorTimeout):
            task.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)

        self._assert_calls_equal(
            recorded_calls[0],
            Call(
                an_int=4,
                a_date=date(2019, 1, 1),
                a_templated_string=f"dag {self.dag.dag_id} ran on {DEFAULT_DATE.date().isoformat()}.",
            ),
        )
