"""Translation acceptance gate (#1376, #155) — 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 against the operator-tunable floor
(Scribe rule 133). No DB, no network."""
from backend.app.tasks.translation import _DEFAULT_MIN_LATIN_CONFIDENCE, _accept


def test_accept_trusts_cjk_regardless_of_confidence_or_floor():
    # ja/ko/zh are script-detected — accepted even at a low reported number and
    # even against a high floor (pure-kanji Japanese can come back labelled zh
    # ~0.75, still translated).
    assert _accept("ja", None) is True
    assert _accept("ja", 0.10, 0.99) 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_default_floor_is_strict():
    # Default floor is 0.90 (#155): the ~0.86 band — where genuine German AND
    # mis-flagged short English collide — is now REJECTED (the whole point of the
    # stricter default). Genuine high-confidence non-English (~1.0) still passes.
    assert _accept("de", 0.98) is True
    assert _accept("de", 0.86) is False            # the collision band, now cut
    assert _accept("de", _DEFAULT_MIN_LATIN_CONFIDENCE) is True          # at floor
    assert _accept("de", _DEFAULT_MIN_LATIN_CONFIDENCE - 0.01) is False
    assert _accept("fr", 0.40) is False            # short mis-flag


def test_accept_honors_an_explicit_floor():
    # The floor is a parameter now (fed from ImportSettings). A looser floor keeps
    # the 0.86 band; a stricter one rejects even a fairly confident detection.
    assert _accept("de", 0.86, 0.80) is True
    assert _accept("de", 0.86, 0.95) is False
    assert _accept("de", 0.96, 0.95) is True


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
    assert _accept("de", None, 0.99) is True       # fail-open beats a high floor