"""空仓选约：跳过历史上已用到期与残留待结算到期。"""

from __future__ import annotations

from datetime import datetime
from zoneinfo import ZoneInfo

from app.strategy.clock import (
    expiry_blocked_by_one_per_day,
    pending_residual_expiry_ymds,
    used_expiry_ymds,
)


class _FakeDB:
    def __init__(
        self,
        *,
        groups: list[dict] | None = None,
        residuals: list[dict] | None = None,
    ) -> None:
        self._groups = groups or []
        self._residuals = residuals or []

    def fetchall(self, sql: str, params: tuple = ()) -> list[dict]:
        s = " ".join(sql.split()).lower()
        if "from groups" in s:
            return [
                r
                for r in self._groups
                if str(r.get("expiry_ymd") or "").strip()
            ]
        if "from residual_options" in s:
            return [r for r in self._residuals if r.get("status") == "pending"]
        return []


def test_used_expiry_ymds_across_calendar_days() -> None:
    """8.2 开过 260803 后，8.3 零点仍须拦截同到期。"""
    db = _FakeDB(
        groups=[
            {"group_id": "G-20260802-01", "expiry_ymd": "260803"},
            {"group_id": "G-20260801-01", "expiry_ymd": "260802"},
        ]
    )
    now_aug3 = datetime(2026, 8, 3, 0, 0, 2, tzinfo=ZoneInfo("Asia/Shanghai"))
    used = used_expiry_ymds(db, now_aug3)
    assert used == {"260803", "260802"}
    assert expiry_blocked_by_one_per_day("260803", used, enabled=True)
    assert not expiry_blocked_by_one_per_day("260804", used, enabled=True)


def test_pending_residual_expiry_ymds() -> None:
    db = _FakeDB(
        residuals=[
            {"expiry_ymd": "260803", "status": "pending"},
            {"expiry_ymd": "260802", "status": "settled"},
            {"expiry_ymd": "", "status": "pending"},
        ]
    )
    assert pending_residual_expiry_ymds(db) == {"260803"}