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from __future__ import annotations

from unittest.mock import Mock, patch

from airflow.models import Pool
from airflow.ti_deps.dependencies_states import EXECUTION_STATES
from airflow.ti_deps.deps.pool_slots_available_dep import PoolSlotsAvailableDep
from airflow.utils.session import create_session
from airflow.utils.state import TaskInstanceState
from tests.test_utils import db


class TestPoolSlotsAvailableDep:
    def setup_method(self):
        db.clear_db_pools()
        with create_session() as session:
            test_pool = Pool(pool="test_pool", include_deferred=False)
            test_includes_deferred_pool = Pool(pool="test_includes_deferred_pool", include_deferred=True)
            session.add_all([test_pool, test_includes_deferred_pool])
            session.commit()

    def teardown_method(self):
        db.clear_db_pools()

    @patch("airflow.models.Pool.open_slots", return_value=0)
    def test_pooled_task_reached_concurrency(self, mock_open_slots):
        ti = Mock(pool="test_pool", pool_slots=1)
        assert not PoolSlotsAvailableDep().is_met(ti=ti)

    @patch("airflow.models.Pool.open_slots", return_value=1)
    def test_pooled_task_pass(self, mock_open_slots):
        ti = Mock(pool="test_pool", pool_slots=1)
        assert PoolSlotsAvailableDep().is_met(ti=ti)

    @patch("airflow.models.Pool.open_slots", return_value=0)
    def test_running_pooled_task_pass(self, mock_open_slots):
        for state in EXECUTION_STATES:
            ti = Mock(pool="test_pool", state=state, pool_slots=1)
            assert PoolSlotsAvailableDep().is_met(ti=ti)

    @patch("airflow.models.Pool.open_slots", return_value=0)
    def test_deferred_pooled_task_pass(self, mock_open_slots):
        ti = Mock(pool="test_includes_deferred_pool", state=TaskInstanceState.DEFERRED, pool_slots=1)
        assert PoolSlotsAvailableDep().is_met(ti=ti)
        ti_to_fail = Mock(pool="test_pool", state=TaskInstanceState.DEFERRED, pool_slots=1)
        assert not PoolSlotsAvailableDep().is_met(ti=ti_to_fail)

    def test_task_with_nonexistent_pool(self):
        ti = Mock(pool="nonexistent_pool", pool_slots=1)
        assert not PoolSlotsAvailableDep().is_met(ti=ti)
