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_views.backend.manifest import get_manifest


class ViewsMigrationTests(unittest.TestCase):
    def test_migration_creates_views_tables_and_head(self) -> None:
        with tempfile.TemporaryDirectory(
            prefix="govoplan-views-migration-"
        ) as directory:
            url = f"sqlite:///{Path(directory) / 'views.db'}"
            migrate_database(
                database_url=url,
                enabled_modules=("views",),
                manifest_factories=(get_manifest,),
            )
            engine = create_engine(url)
            try:
                with engine.connect() as connection:
                    self.assertIn(
                        "b8e4c1f7a2d9",
                        set(MigrationContext.configure(connection).get_current_heads()),
                    )
                    self.assertEqual(
                        {
                            "view_assignments",
                            "view_definitions",
                            "view_preferences",
                            "view_revisions",
                        },
                        {
                            name
                            for name in inspect(connection).get_table_names()
                            if name.startswith("view_")
                        },
                    )
            finally:
                engine.dispose()


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