"""银行交易查询 API 客户端。"""

import httpx

from app.config import settings


class BankApiError(RuntimeError):
    """银行接口错误。"""

    def __init__(
        self,
        message: str,
        retryable: bool = False,
        http_status: int | None = None,
    ):
        super().__init__(message)
        self.retryable = retryable
        self.http_status = http_status


async def query_bank_transactions(
    acct_no: str,
    start_date: str,
    end_date: str,
    dc_flag: int | None = None,
    page: int = 1,
    page_size: int = 20,
) -> dict:
    """查询银行交易流水。

    调用外部银行接口，按账号和日期范围查询交易记录。

    :param acct_no: 我方银行账号
    :param start_date: 开始日期 (YYYY-MM-DD)
    :param end_date: 结束日期 (YYYY-MM-DD)
    :param dc_flag: 借贷方向 (0-借/出金, 1-贷/入金, None-全部)
    :param page: 页码
    :param page_size: 每页数量 (最大 100)
    :return: 接口返回的原始数据
    """
    base = (settings.BANK_API_BASE or "").rstrip("/")
    if not base:
        raise BankApiError("银行接口地址未配置 (BANK_API_BASE)", retryable=False)

    url = f"{base}/api/v1/internal/get-blank-transfer-acct-time"
    headers = {
        "api-key": settings.BANK_API_KEY or "",
        "Content-Type": "application/json",
    }
    payload: dict = {
        "acct_no": acct_no,
        "start_date": start_date,
        "end_date": end_date,
        "page": page,
        "page_size": min(page_size, 100),
    }
    if dc_flag is not None:
        payload["dc_flag"] = dc_flag

    timeout = httpx.Timeout(30.0)
    try:
        async with httpx.AsyncClient(timeout=timeout, follow_redirects=True) as client:
            response = await client.post(url, headers=headers, json=payload)
            response.raise_for_status()
            return response.json()
    except httpx.HTTPStatusError as e:
        raise BankApiError(
            f"银行接口返回错误: HTTP {e.response.status_code}",
            retryable=e.response.status_code >= 500,
            http_status=e.response.status_code,
        ) from e
    except httpx.TimeoutException as e:
        raise BankApiError("银行接口请求超时", retryable=True) from e
    except httpx.RequestError as e:
        raise BankApiError(f"银行接口请求失败: {e}", retryable=True) from e