from __future__ import annotations

import tempfile
import unittest
from pathlib import Path

from alembic.runtime.migration import MigrationContext
from sqlalchemy import create_engine, inspect

from govoplan_core.db.migrations import migrate_database
from govoplan_dataflow.backend.manifest import get_manifest


class DataflowMigrationTests(unittest.TestCase):
    def test_baseline_creates_dataflow_tables_and_head(self) -> None:
        with tempfile.TemporaryDirectory(prefix="govoplan-dataflow-migration-") as directory:
            url = f"sqlite:///{Path(directory) / 'dataflow.db'}"
            migrate_database(
                database_url=url,
                enabled_modules=("dataflow",),
                manifest_factories=(get_manifest,),
            )
            engine = create_engine(url)
            try:
                with engine.connect() as connection:
                    self.assertIn(
                        "d4f7a1c8e2b0",
                        set(MigrationContext.configure(connection).get_current_heads()),
                    )
                    self.assertEqual(
                        {
                            "dataflow_pipelines",
                            "dataflow_pipeline_revisions",
                            "dataflow_runs",
                        },
                        {
                            name
                            for name in inspect(connection).get_table_names()
                            if name.startswith("dataflow_")
                        },
                    )
            finally:
                engine.dispose()


if __name__ == "__main__":
    unittest.main()