"""Translation acceptance gate (#1376) — pure unit tests for ``_accept``, which
decides whether curator stores Interpreter's translation or keeps the original.
Curator does no detection of its own; it only thresholds Interpreter's reported
detected language + confidence (Scribe rule 133). No DB, no network."""
from backend.app.tasks.translation import _MIN_LATIN_CONFIDENCE, _accept


def test_accept_trusts_cjk_regardless_of_confidence():
    # ja/ko/zh are script-detected — accepted even at a low reported number
    # (pure-kanji Japanese can come back labelled zh ~0.75, still translated).
    assert _accept("ja", None) is True
    assert _accept("ja", 0.10) is True
    assert _accept("ko", 0.99) is True
    assert _accept("zh", 0.75) is True
    assert _accept("zh-CN", 0.20) is True      # region suffix is still CJK


def test_accept_requires_floor_for_latin():
    assert _accept("de", 0.98) is True
    assert _accept("de", 0.86) is True    # calibrated: ambiguous-but-correct German stays
    assert _accept("de", _MIN_LATIN_CONFIDENCE) is True          # exactly at floor
    assert _accept("de", _MIN_LATIN_CONFIDENCE - 0.01) is False
    assert _accept("fr", 0.40) is False                          # short mis-flag


def test_accept_is_case_insensitive():
    assert _accept("JA", None) is True
    assert _accept("DE", 0.40) is False


def test_accept_missing_confidence_fails_open():
    # No confidence reported → don't silently drop a translation.
    assert _accept("de", None) is True
    assert _accept("", None) is True