"""i18next detector."""

import json
from pathlib import Path
from typing import Optional

from i18n_guardian.detectors.base import Detector


class I18NextDetector(Detector):
    """Detect i18next library usage."""

    @property
    def name(self) -> str:
        return "i18next"

    @property
    def patterns(self) -> list:
        return ["package.json", "i18next.config.js", "i18n.config.js"]

    def detect(self, path: Path) -> Optional[str]:
        """Check for i18next usage."""
        package_json = path / "package.json"
        if package_json.exists():
            try:
                with open(package_json, "r", encoding="utf-8") as f:
                    data = json.load(f)
                    dependencies = data.get("dependencies", {})
                    dev_dependencies = data.get("devDependencies", {})
                    all_deps = {**dependencies, **dev_dependencies}
                    if "i18next" in all_deps:
                        return self.name
            except (json.JSONDecodeError, OSError):
                pass

        i18next_config = path / "i18next.config.js"
        if i18next_config.exists():
            return self.name

        i18n_config = path / "i18n.config.js"
        if i18n_config.exists():
            content = i18n_config.read_text(encoding="utf-8")
            if "i18next" in content:
                return self.name

        locales_dir = path / "locales"
        if locales_dir.exists():
            for lang_file in locales_dir.glob("*.json"):
                content = lang_file.read_text(encoding="utf-8")
                try:
                    data = json.loads(content)
                    if isinstance(data, dict) and len(data) > 0:
                        return self.name
                except json.JSONDecodeError:
                    continue

        for js_file in path.rglob("*.js"):
            try:
                content = js_file.read_text(encoding="utf-8")
                if "i18n.t(" in content or "i18next.t(" in content:
                    return self.name
            except OSError:
                continue

        return None

    def get_i18n_functions(self) -> list:
        """Get i18next function names."""
        return [
            "t",
            "i18n.t",
            "i18next.t",
            "useTranslation",
            "withTranslation",
        ]