"""扫描健壮性：脏数据不该让整批停摆，调度器不该"重启后再也不跑"。

这两条都属于"风控看起来在工作、其实没在跑"那类缺陷，现象上很难发现：

1. `_level_value` 原先直接 `int(level.replace(prefix, ""))` —— 一条等级字段脏的数据
   （比如写了「中风险」）会抛 ValueError，冒到 `scan()` 的兜底 → **整批 rollback**，
   本次扫描前面已经生成的预警全部作废。
2. 调度器的 `last_run_at` 只在内存，重启后为 None，而 `_is_due` 此时返回
   `config.run_immediately`（默认 False）→ **重启后永不执行**，且没有任何告警。
"""

import datetime as dt
from types import SimpleNamespace
from typing import Any, cast

from app.service.risk_scan_service import _level_value
from app.worker.risk_scan_scheduler import RiskScanSchedulerWorker


def test_level_value_parses_valid_levels() -> None:
    assert _level_value("R2", "R") == 2
    assert _level_value("C3", "C") == 3
    assert _level_value("c5", "C") == 5  # 大小写不敏感
    assert _level_value(" 2 ", "R") == 2  # 历史数据可能不带前缀


def test_level_value_returns_none_instead_of_raising_on_dirty_data() -> None:
    """脏数据返回 None，不抛异常 —— 这是不让整批扫描 rollback 的前提。"""
    assert _level_value("中风险", "R") is None
    assert _level_value("", "R") is None
    assert _level_value("R", "R") is None
    assert _level_value("R6", "R") == 6  # 越界值交给上层比较，解析本身只负责取数字


def test_level_value_does_not_over_strip() -> None:
    """用 removeprefix 而非 replace：`R2R` 不该被错当成 2。"""
    assert _level_value("R2R", "R") is None


def _scheduler(*, last_run_at: dt.datetime | None) -> RiskScanSchedulerWorker:
    """只构造被测方法用到的那两个属性。"""
    scheduler = object.__new__(RiskScanSchedulerWorker)
    scheduler.last_run_at = last_run_at
    return scheduler


def _config(*, run_immediately: bool, interval_minutes: int = 30) -> Any:
    return SimpleNamespace(run_immediately=run_immediately, interval_minutes=interval_minutes)


_NOW = dt.datetime(2026, 9, 11, 12, 0, tzinfo=dt.UTC)


def test_first_run_is_due_even_when_run_immediately_is_false() -> None:
    """进程刚起来（last_run_at 为 None）必须视为 due，哪怕是 run_immediately=False。

    原先这里返回 run_immediately，默认 False ⇒ 重启后永不执行。
    """
    scheduler = cast(Any, _scheduler(last_run_at=None))

    assert scheduler._is_due(_config(run_immediately=False), _NOW) is True


def test_not_due_before_interval_elapses() -> None:
    scheduler = cast(Any, _scheduler(last_run_at=_NOW - dt.timedelta(minutes=10)))

    assert scheduler._is_due(_config(run_immediately=False), _NOW) is False


def test_due_after_interval_elapses() -> None:
    scheduler = cast(Any, _scheduler(last_run_at=_NOW - dt.timedelta(minutes=31)))

    assert scheduler._is_due(_config(run_immediately=False), _NOW) is True