"""Gettext detector."""

from pathlib import Path
from typing import Optional

from i18n_guardian.detectors.base import Detector


class GettextDetector(Detector):
    """Detect Gettext library usage."""

    @property
    def name(self) -> str:
        return "gettext"

    @property
    def patterns(self) -> list:
        return ["*.po", "*.pot", "messages.po"]

    def detect(self, path: Path) -> Optional[str]:
        """Check for Gettext usage."""
        for po_file in path.rglob("*.po"):
            if po_file.exists():
                return self.name

        for pot_file in path.rglob("*.pot"):
            if pot_file.exists():
                return self.name

        for py_file in path.rglob("*.py"):
            try:
                content = py_file.read_text(encoding="utf-8")
                if "_(" in content and ("import gettext" in content or "import _" in content):
                    return self.name
            except OSError:
                continue

        return None

    def get_i18n_functions(self) -> list:
        """Get Gettext function names."""
        return [
            "_",
            "gettext",
            "ngettext",
            "pgettext",
            "npgettext",
        ]