from __future__ import annotations

from unittest.mock import MagicMock, patch

from apps.exchange.services import ExchangeServiceError
from apps.exchange.tasks import copy_parsers_data_async, dispatch_periodic_exchange_copy
from django.test import SimpleTestCase


class ExchangeTasksTest(SimpleTestCase):
    def test_dispatch_periodic_exchange_copy_enqueues_copy_with_active_connection(self):
        active_connection = MagicMock(id=15)

        with patch(
            "apps.exchange.tasks.ExchangeConnectionService.get_active_connection",
            return_value=active_connection,
        ) as get_connection_mock, patch(
            "apps.exchange.tasks.copy_parsers_data_async.delay",
            return_value=MagicMock(id="task-15"),
        ) as delay_mock:
            result = dispatch_periodic_exchange_copy.run(
                payload={"mode": "all", "truncate_before_copy": True}
            )

        self.assertEqual(
            result,
            {
                "status": "queued",
                "task_id": "task-15",
                "connection_id": 15,
            },
        )
        get_connection_mock.assert_called_once_with()
        delay_mock.assert_called_once_with(
            connection_id=15,
            payload={"mode": "all", "truncate_before_copy": True},
            requested_by_id=None,
        )

    def test_dispatch_periodic_exchange_copy_fails_without_active_connection(self):
        with patch(
            "apps.exchange.tasks.ExchangeConnectionService.get_active_connection",
            side_effect=ExchangeServiceError("Активное подключение не найдено"),
        ), self.assertRaisesMessage(
            ExchangeServiceError,
            "Активное подключение не найдено",
        ):
            dispatch_periodic_exchange_copy.run(payload={"mode": "all"})

    def test_copy_parsers_data_async_completes_with_existing_job(self):
        background_job = MagicMock()
        connection = MagicMock()

        copy_parsers_data_async.push_request(id="task-1")
        try:
            with patch(
                "apps.exchange.tasks.BackgroundJobService.get_by_task_id_or_none",
                return_value=background_job,
            ) as get_job_mock, patch(
                "apps.exchange.tasks.ExchangeConnection.objects.filter",
            ) as filter_mock, patch(
                "apps.exchange.tasks.ExchangeConnectionService.copy_parsers_data",
                return_value={
                    "mode": "all",
                    "tables": ["fake_table"],
                    "rows_by_table": {"fake_table": 3},
                    "total_rows": 3,
                    "truncate_before_copy": True,
                },
            ) as copy_mock:
                filter_mock.return_value.first.return_value = connection

                result = copy_parsers_data_async.run(
                    connection_id=11,
                    payload={"mode": "all", "truncate_before_copy": True},
                    requested_by_id=7,
                )
        finally:
            copy_parsers_data_async.pop_request()

        self.assertEqual(result["status"], "success")
        self.assertEqual(result["connection_id"], 11)
        get_job_mock.assert_called_once_with("task-1")
        background_job.mark_started.assert_called_once_with()
        background_job.update_progress.assert_any_call(
            10,
            "Проверка структуры целевой БД",
        )
        background_job.update_progress.assert_any_call(90, "Фиксация результата")
        background_job.complete.assert_called_once_with(result=result)
        copy_mock.assert_called_once_with(
            connection=connection,
            mode="all",
            truncate_before_copy=True,
        )

    def test_copy_parsers_data_async_creates_job_and_fails_when_connection_missing(
        self,
    ):
        background_job = MagicMock()

        copy_parsers_data_async.push_request(id=None)
        try:
            with patch(
                "apps.exchange.tasks.uuid.uuid4", return_value="generated-task-id"
            ), patch(
                "apps.exchange.tasks.BackgroundJobService.get_by_task_id_or_none",
                return_value=None,
            ), patch(
                "apps.exchange.tasks.BackgroundJobService.create_job",
                return_value=background_job,
            ) as create_job_mock, patch(
                "apps.exchange.tasks.ExchangeConnection.objects.filter",
            ) as filter_mock, self.assertRaisesMessage(
                ValueError,
                "Active exchange connection not found: 42",
            ):
                filter_mock.return_value.first.return_value = None
                copy_parsers_data_async.run(
                    connection_id=42,
                    payload={"mode": "all"},
                    requested_by_id=3,
                )
        finally:
            copy_parsers_data_async.pop_request()

        create_job_mock.assert_called_once_with(
            task_id="generated-task-id",
            task_name="apps.exchange.tasks.copy_parsers_data_async",
            user_id=3,
            meta={"connection_id": 42, "mode": "all"},
        )
        background_job.fail.assert_called_once_with(
            error="Активное подключение не найдено"
        )

    def test_copy_parsers_data_async_marks_failure_and_reraises(self):
        background_job = MagicMock()
        connection = MagicMock()

        copy_parsers_data_async.push_request(id="task-2")
        try:
            with patch(
                "apps.exchange.tasks.BackgroundJobService.get_by_task_id_or_none",
                return_value=background_job,
            ), patch(
                "apps.exchange.tasks.ExchangeConnection.objects.filter",
            ) as filter_mock, patch(
                "apps.exchange.tasks.ExchangeConnectionService.copy_parsers_data",
                side_effect=RuntimeError("copy failed"),
            ), patch(
                "apps.exchange.tasks.logger.exception"
            ) as logger_mock, self.assertRaisesMessage(RuntimeError, "copy failed"):
                filter_mock.return_value.first.return_value = connection
                copy_parsers_data_async.run(
                    connection_id=9,
                    payload={
                        "mode": "selected",
                        "tables": ["fake_table"],
                    },
                )
        finally:
            copy_parsers_data_async.pop_request()

        background_job.fail.assert_called_once_with(error="copy failed")
        logger_mock.assert_called_once()