"""AKShare 数据源（兜底/校验）。免费、无需 token。

默认不安装（依赖较重）；如需启用：`uv add akshare`。
fetcher 在 Tushare 失败时会尝试本模块；未安装则该路径自动跳过。
"""
from __future__ import annotations

from datetime import datetime

from ..domain import Bar
from .symbols import plain_code


def fetch_daily(code: str, start: str = "20200101", end: str | None = None,
                adjust: str = "qfq") -> list[Bar]:
    import akshare as ak  # 延迟导入

    end = end or datetime.now().strftime("%Y%m%d")
    symbol = plain_code(code)
    adj_map = {"qfq": "qfq", "hfq": "hfq", "": "", None: ""}
    df = ak.stock_zh_a_hist(
        symbol=symbol, period="daily",
        start_date=start, end_date=end, adjust=adj_map.get(adjust, ""),
    )
    if df is None or df.empty:
        raise RuntimeError(f"AKShare 无数据: {symbol}")

    bars: list[Bar] = []
    for _, r in df.iterrows():
        amt = r.get("成交额")
        bars.append(
            Bar(
                ts=datetime.strptime(str(r["日期"]), "%Y-%m-%d"),
                open=float(r["开盘"]), high=float(r["最高"]),
                low=float(r["最低"]), close=float(r["收盘"]),
                volume=float(r["成交量"]) * 100.0,  # AKShare 成交量单位为手 -> 股
                amount=float(amt) if amt is not None and amt == amt else None,  # AKShare 成交额单位为元
            )
        )
    return bars