import re
import unittest
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
HEADER_ROOT = ROOT / "src" / "fesa"


def _looks_like_function_definition(prefix):
    if "(" not in prefix or ")" not in prefix:
        return False

    stripped = prefix.strip()
    control_prefixes = ("if ", "for ", "while ", "switch ", "catch ")
    declaration_prefixes = ("namespace ", "class ", "struct ", "enum ")
    return not stripped.startswith(control_prefixes + declaration_prefixes)


class HeaderDeclarationOnlyTests(unittest.TestCase):
    def test_solver_headers_do_not_contain_function_bodies(self):
        violations = []

        for header in sorted(HEADER_ROOT.rglob("*.hpp")):
            candidate = ""
            for line_number, line in enumerate(header.read_text(encoding="utf-8").splitlines(), start=1):
                stripped = line.strip()
                if not stripped:
                    continue

                candidate = f"{candidate} {stripped}".strip()
                if "{" in stripped and _looks_like_function_definition(candidate.split("{", 1)[0]):
                    violations.append(f"{header.relative_to(ROOT)}:{line_number}: function body in header")

                if re.search(r"\([^;{}]*\)\s*=\s*(default|delete)\s*;", stripped):
                    violations.append(f"{header.relative_to(ROOT)}:{line_number}: function definition in header")

                if stripped.endswith(";") or stripped.endswith("}") or stripped.endswith(":"):
                    candidate = ""

        self.assertEqual([], violations)


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