from __future__ import annotations

from pathlib import Path
import tempfile
import unittest

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

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


class ApprovalsMigrationTests(unittest.TestCase):
    def test_fresh_migration_creates_approval_runtime_tables(self) -> None:
        with tempfile.TemporaryDirectory(prefix="govoplan-approvals-") as directory:
            url = f"sqlite:///{Path(directory) / 'approvals.db'}"
            migrate_database(
                database_url=url,
                enabled_modules=("approvals",),
                manifest_factories=(get_manifest,),
            )
            engine = create_engine(url)
            try:
                tables = set(inspect(engine).get_table_names())
                self.assertTrue(
                    {
                        "approval_template_revisions",
                        "approval_request_revisions",
                        "approval_decision_records",
                        "approval_lifecycle_events",
                        "approval_replays",
                    }.issubset(tables)
                )
                with engine.connect() as connection:
                    self.assertIn(
                        "8b9c0d1e2f3a",
                        set(MigrationContext.configure(connection).get_current_heads()),
                    )
            finally:
                engine.dispose()


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