from __future__ import annotations

import sys
import unittest
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT / "src"))

from euler_common import answer_is_correct, extract_final_answer  # noqa: E402


class CommonTest(unittest.TestCase):
    def test_extracts_last_balanced_box(self) -> None:
        answer, kind = extract_final_answer(r"first \boxed{1}; final \boxed{\frac{3}{2}}")
        self.assertEqual(answer, r"\frac{3}{2}")
        self.assertEqual(kind, "boxed")

    def test_final_answer_is_diagnostic_fallback(self) -> None:
        answer, kind = extract_final_answer("work\nFINAL_ANSWER: 123,456")
        self.assertEqual(answer, "123,456")
        self.assertEqual(kind, "final_answer")

    def test_normalized_integer_answer(self) -> None:
        self.assertTrue(answer_is_correct("123,456", "123456"))
        self.assertFalse(answer_is_correct("123457", "123456"))


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