from __future__ import annotations

import unittest

from govoplan_core.core.datasources import DatasourceValidationError
from govoplan_datasources.backend.tabular import (
    fingerprint_rows,
    infer_schema,
    parse_csv_rows,
)


class DatasourceTabularTests(unittest.TestCase):
    def test_csv_schema_and_fingerprint_are_stable(self) -> None:
        rows = parse_csv_rows("id;name\n1;Ada\n2;\n", delimiter=";")
        schema = infer_schema(rows)

        self.assertEqual(["id", "name"], [field.name for field in schema])
        self.assertTrue(schema[1].nullable)
        self.assertEqual(
            fingerprint_rows(rows, schema),
            fingerprint_rows(rows, schema),
        )

    def test_csv_requires_headers(self) -> None:
        with self.assertRaises(DatasourceValidationError):
            parse_csv_rows("", delimiter=",")


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