"""客户生命周期判定纯函数测试(批次A Task4)。

口径(v2 §1.1 #3 + v1 §21 默认,已用户确认):新客 7 天、沉睡 30 天、
历史≥5 条才算沉睡(对齐 churn real min_msgs=5)。analytics 现有页
(churn/客户资产)暂不切换(口径差异 v2 §5 标注),不动 636 既有测试。
"""

from app.analytics.lifecycle import DORMANT_DAYS, MIN_HISTORY_MSGS, NEW_DAYS, classify, day_add


def test_constants_locked_to_confirmed_defaults():
    assert NEW_DAYS == 7 and DORMANT_DAYS == 30 and MIN_HISTORY_MSGS == 5


def test_new_customer():
    # 首次沟通在 7 天窗口内
    assert (
        classify(first_day=20260901, last_day=20260903, prev_day=None, as_of=20260905, hist_msgs=2)
        == "new"
    )
    # 窗口边界:as_of-6=20260830 含当天共 7 天 → new;再早一天 → 非 new
    assert classify(20260830, 20260830, None, 20260905, 100) == "new"
    assert classify(20260829, 20260829, None, 20260905, 100) == "cooling"


def test_reactivated_requires_gap_over_30d():
    # 当日回流且前次间隔>30 天
    assert (
        classify(
            first_day=20260101, last_day=20260905, prev_day=20260801, as_of=20260905, hist_msgs=50
        )
        == "reactivated"
    )
    # 间隔仅 9 天 → 只是 active
    assert (
        classify(
            first_day=20260101, last_day=20260905, prev_day=20260827, as_of=20260905, hist_msgs=50
        )
        == "active"
    )
    # 间隔恰好 30 天 → 严格 >30 不算回流,落回 active
    assert (
        classify(
            first_day=20260101, last_day=20260905, prev_day=20260806, as_of=20260905, hist_msgs=50
        )
        == "active"
    )
    # 回流必须当日互动:前次间隔 31 天(>30)但 last_day=as_of-1 → 不算回流,按 gap=1 落 active
    assert classify(20260101, 20260904, 20260804, 20260905, 50) == "active"


def test_active_cooling_dormant_boundaries():
    f, m = 20260101, 100
    assert classify(f, 20260830, None, 20260905, m) == "active"  # 6 天
    assert classify(f, 20260829, None, 20260905, m) == "cooling"  # 7 天
    assert classify(f, 20260807, None, 20260905, m) == "cooling"  # 29 天
    assert classify(f, 20260806, None, 20260905, m) == "dormant"  # 30 天


def test_dormant_requires_history():
    # ≥30 天无互动但历史<5 条:不计入任何状态(None)
    assert classify(20260101, 20260806, None, 20260905, 4) is None
    assert classify(20260101, 20260806, None, 20260905, 5) == "dormant"


def test_no_interaction_returns_none():
    assert classify(None, None, None, 20260905, 0) is None


def test_day_add():
    assert day_add(20260831, 1) == 20260901
    assert day_add(20260901, -7) == 20260825