import json
from pathlib import Path

from webapp.i18n import load_translations


def test_load_translations_uses_english_fallback_for_missing_values() -> None:
    translations = load_translations("fi")

    assert translations["nav.instructions"]
    assert translations["app.title"] == "Linkki Botti"


def test_load_translations_prefers_requested_language_value() -> None:
    translations = load_translations("sv")

    assert translations["nav.instructions"] != "Instructions"


def test_translation_catalog_has_no_common_utf8_mojibake_in_finnish_or_swedish() -> None:
    catalog = json.loads(
        (Path(__file__).resolve().parents[1] / "webapp/translations/catalog.json").read_text(
            encoding="utf-8"
        )
    )

    def visit(value: object) -> list[str]:
        if isinstance(value, str):
            return [value]
        if isinstance(value, list):
            result: list[str] = []
            for item in value:
                result.extend(visit(item))
            return result
        if isinstance(value, dict):
            result: list[str] = []
            for nested in value.values():
                result.extend(visit(nested))
            return result
        return []

    suspicious_markers = ("\u00c3", "\u00c2", "\ufffd")
    for entry in catalog.values():
        for language in ("fi", "sv"):
            for text in visit(entry.get(language, "")):
                assert not any(marker in text for marker in suspicious_markers), text