"""SubPattern.supports_flip/flip_axis 默认值 + AR 两个子模式的翻转声明。"""

from app.question_gen.strategy import SubPattern
from app.question_gen.strategy_action_recognition import AR_SUB_PATTERNS

_FLIP_EXPECTED = {
    "temporal_reasoning_failure": "before/after",
    "cross_segment_entity_tracking": "first/last",
}


def test_sub_pattern_defaults_no_flip():
    sp = SubPattern(
        name="x", weight=1.0, sampling_level_override=None,
        constraint_override=None, instruction="i",
    )
    assert sp.supports_flip is False
    assert sp.flip_axis is None


def test_ar_flip_declarations():
    by_name = {sp.name: sp for sp in AR_SUB_PATTERNS}
    for name, axis in _FLIP_EXPECTED.items():
        assert by_name[name].supports_flip is True, name
        assert by_name[name].flip_axis == axis, name


def test_other_ar_sub_patterns_keep_defaults():
    for sp in AR_SUB_PATTERNS:
        if sp.name in _FLIP_EXPECTED:
            continue
        assert sp.supports_flip is False, sp.name
        assert sp.flip_axis is None, sp.name


def test_non_ar_strategies_have_no_flip_capable_sub_pattern():
    """非 AR 题型走 BaseTaskTypeStrategy，无 SubPattern（select_sub_pattern 返回 None），
    故不存在 flip-capable 子模式——翻转门对它们天然跳过。"""
    import random
    from app.question_gen.strategy import get_strategy

    non_ar = [
        "Action Reasoning", "Attribute Perception", "Counting Problem",
        "Information Synopsis", "Object Recognition", "Object Reasoning",
        "OCR Problems", "Spatial Perception", "Spatial Reasoning",
        "Temporal Perception", "Temporal Reasoning",
    ]
    rng = random.Random(0)
    for tt in non_ar:
        assert get_strategy(tt).select_sub_pattern(rng) is None, tt


def test_only_two_ar_sub_patterns_support_flip():
    """全 6 个 AR SubPattern 中恰有 2 个 supports_flip=True，其余 4 个默认 False。"""
    from app.question_gen.strategy_action_recognition import AR_SUB_PATTERNS

    flip_names = {sp.name for sp in AR_SUB_PATTERNS if sp.supports_flip}
    assert flip_names == {"temporal_reasoning_failure", "cross_segment_entity_tracking"}
    assert all(sp.flip_axis is None for sp in AR_SUB_PATTERNS if not sp.supports_flip)