"""
支付渠道工厂
根据配置返回对应的支付 Provider
默认使用 zpay 替代 xorpay
"""
from ..config import (
    PAYMENT_PROVIDER,
    XORPAY_AID,
    XORPAY_SECRET,
    XORPAY_CASHIER_URL,
    ZPAY_PID,
    ZPAY_KEY,
)
from .base import PaymentProvider
from .xorpay import XorPayProvider
from .zpay import ZPayProvider

_provider_instance: PaymentProvider | None = None


def get_payment_provider() -> PaymentProvider:
    """获取当前配置的支付渠道实例（单例）"""
    global _provider_instance
    if _provider_instance is not None:
        return _provider_instance
    if PAYMENT_PROVIDER == "zpay":
        _provider_instance = ZPayProvider(pid=ZPAY_PID, key=ZPAY_KEY)
    else:
        _provider_instance = XorPayProvider(
            aid=XORPAY_AID,
            secret=XORPAY_SECRET,
            cashier_url=XORPAY_CASHIER_URL,
        )
    return _provider_instance


def get_payment_provider_by_name(name: str) -> PaymentProvider:
    """按名称获取 Provider（用于 per-request 覆盖）"""
    if name == "xorpay":
        return XorPayProvider(
            aid=XORPAY_AID,
            secret=XORPAY_SECRET,
            cashier_url=XORPAY_CASHIER_URL,
        )
    return ZPayProvider(pid=ZPAY_PID, key=ZPAY_KEY)


def reset_provider():
    """重置 Provider（用于测试或切换渠道）"""
    global _provider_instance
    _provider_instance = None