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_core.db.migrations import migrate_database
from govoplan_records.backend.manifest import get_manifest


class RecordsMigrationTests(unittest.TestCase):
    def test_fresh_migration_creates_records_kernel_and_head(self) -> None:
        with tempfile.TemporaryDirectory(
            prefix="govoplan-records-migration-"
        ) as directory:
            url = f"sqlite:///{Path(directory) / 'records.db'}"
            migrate_database(
                database_url=url,
                enabled_modules=("records",),
                manifest_factories=(get_manifest,),
            )
            engine = create_engine(url)
            try:
                inspector = inspect(engine)
                self.assertTrue(
                    {
                        "record_chronology_entries",
                        "record_class_revisions",
                        "record_file_plan_revisions",
                        "record_identities",
                        "record_items",
                        "record_revisions",
                        "record_volume_revisions",
                    }.issubset(inspector.get_table_names())
                )
                self.assertIn(
                    "source_revision",
                    {item["name"] for item in inspector.get_columns("record_items")},
                )
                with engine.connect() as connection:
                    self.assertIn(
                        "6e4a2c8f1d9b",
                        set(MigrationContext.configure(connection).get_current_heads()),
                    )
            finally:
                engine.dispose()


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