from __future__ import annotations

from pathlib import Path
from tempfile import TemporaryDirectory
from types import SimpleNamespace
from unittest.mock import MagicMock, patch

from apps.backups.models import BackupExportJob
from apps.backups.services import BackupArtifact
from apps.backups.tasks import _resolve_backup_target_path, generate_backup_for_date
from django.test import TestCase, override_settings

from tests.apps.user.factories import UserFactory


class BackupTasksTest(TestCase):
    def test_resolve_backup_target_path_creates_directory_and_renames_existing_file(self):
        with TemporaryDirectory() as tmp_dir:
            with override_settings(BACKUP_EXPORT_DIRECTORY=tmp_dir):
                existing = Path(tmp_dir) / "backup.zip"
                existing.write_bytes(b"existing")

                with patch("apps.backups.tasks.uuid.uuid4") as uuid_mock:
                    uuid_mock.return_value.hex = "deadbeefcafebabe"
                    target = _resolve_backup_target_path("backup.zip")

        self.assertEqual(target.name, "backup_deadbeef.zip")

    def test_generate_backup_for_date_returns_skipped_when_job_is_missing(self):
        generate_backup_for_date.push_request(id="task-missing")
        try:
            result = generate_backup_for_date.run(job_id=999999)
        finally:
            generate_backup_for_date.pop_request()

        self.assertEqual(result, {"status": "skipped", "reason": "job_not_found"})

    def test_generate_backup_for_date_builds_archive_and_updates_job(self):
        user = UserFactory.create_user()
        job = BackupExportJob.objects.create(
            actual_date=user.date_joined.date(),
            requested_by=user,
            status=BackupExportJob.Status.PENDING,
        )
        background_job = MagicMock()
        artifact = BackupArtifact(
            archive_bytes=b"zip-bytes",
            archive_filename="backup.zip",
            bin_filename="backup.bin",
            checksum_filename="backup.zip.sha256",
            checksum_sha256="a" * 64,
            organizations_count=5,
            actual_date=job.actual_date,
        )

        with TemporaryDirectory() as tmp_dir:
            with override_settings(BACKUP_EXPORT_DIRECTORY=tmp_dir):
                generate_backup_for_date.push_request(id="task-success")
                try:
                    with patch(
                        "apps.backups.tasks.BackgroundJobService.get_by_task_id_or_none",
                        return_value=None,
                    ):
                        with patch(
                            "apps.backups.tasks.BackgroundJobService.create_job",
                            return_value=background_job,
                        ) as create_job_mock:
                            with patch(
                                "apps.backups.tasks.BackupExportService.build_backup_archive",
                                return_value=artifact,
                            ) as build_mock:
                                result = generate_backup_for_date.run(job_id=job.id)
                finally:
                    generate_backup_for_date.pop_request()

                job.refresh_from_db()
                self.assertEqual(job.status, BackupExportJob.Status.SUCCESS)
                self.assertEqual(job.task_id, "task-success")
                self.assertEqual(job.archive_filename, "backup.zip")
                self.assertEqual(job.checksum_filename, "backup.zip.sha256")
                self.assertEqual(job.organizations_count, 5)
                self.assertTrue(Path(job.archive_path).is_file())

        self.assertEqual(result["status"], "success")
        self.assertEqual(result["archive_filename"], "backup.zip")
        create_job_mock.assert_called_once()
        build_mock.assert_called_once_with(actual_date=job.actual_date)
        background_job.mark_started.assert_called_once_with()
        background_job.update_progress.assert_any_call(10, "Подготовка backup-данных")
        background_job.update_progress.assert_any_call(70, "Запись архива на диск")
        background_job.complete.assert_called_once_with(result=result)

    def test_generate_backup_for_date_marks_failure(self):
        user = UserFactory.create_user()
        job = BackupExportJob.objects.create(
            actual_date=user.date_joined.date(),
            requested_by=user,
            status=BackupExportJob.Status.PENDING,
        )
        background_job = MagicMock()

        generate_backup_for_date.push_request(id="task-failure")
        try:
            with patch(
                "apps.backups.tasks.BackgroundJobService.get_by_task_id_or_none",
                return_value=background_job,
            ):
                with patch(
                    "apps.backups.tasks.BackupExportService.build_backup_archive",
                    side_effect=RuntimeError("boom"),
                ):
                    with patch("apps.backups.tasks.logger.exception") as logger_mock:
                        with self.assertRaisesMessage(RuntimeError, "boom"):
                            generate_backup_for_date.run(job_id=job.id)
        finally:
            generate_backup_for_date.pop_request()

        logger_mock.assert_called_once()
        background_job.fail.assert_called_once_with(error="boom")
        job.refresh_from_db()
        self.assertEqual(job.status, BackupExportJob.Status.FAILURE)
        self.assertEqual(job.error, "boom")