"""
支付模块配置
从环境变量读取微信支付和支付宝的商户密钥等配置
"""
import os
import logging
from dataclasses import dataclass, field
from typing import Optional

logger = logging.getLogger(__name__)


@dataclass
class WeChatPayConfig:
    """微信支付配置"""
    app_id: str = ""                    # 应用 APPID
    mch_id: str = ""                    # 商户号
    api_v3_key: str = ""                # APIv3 密钥
    private_key_path: str = ""          # 商户 API 私钥文件路径（与 private_key 二选一）
    private_key: str = ""               # 商户 API 私钥内容（PEM 字符串，可放环境变量，与 private_key_path 二选一）
    cert_serial_no: str = ""            # 商户证书序列号
    notify_url: str = ""                # 支付结果回调地址

    @property
    def is_configured(self) -> bool:
        has_key = bool(self.private_key.strip()) or bool(self.private_key_path.strip())
        return all([
            self.app_id, self.mch_id, self.api_v3_key,
            has_key, self.cert_serial_no, self.notify_url
        ])


@dataclass
class AlipayConfig:
    """支付宝配置"""
    app_id: str = ""                    # 应用 APPID
    private_key: str = ""               # 应用私钥（字符串内容）
    alipay_public_key: str = ""         # 支付宝公钥（字符串内容）
    notify_url: str = ""                # 支付结果回调地址
    sign_type: str = "RSA2"             # 签名类型，默认 RSA2

    @property
    def is_configured(self) -> bool:
        return all([
            self.app_id, self.private_key,
            self.alipay_public_key, self.notify_url
        ])


@dataclass
class PaymentConfig:
    """支付模块总配置"""
    wechat: WeChatPayConfig = field(default_factory=WeChatPayConfig)
    alipay: AlipayConfig = field(default_factory=AlipayConfig)
    # 支付宝是否视为「开发中」不可用（默认 True，上线时设 ALIPAY_UNDER_DEVELOPMENT=false）
    alipay_under_development: bool = True

    @classmethod
    def from_env(cls) -> "PaymentConfig":
        """从环境变量加载配置"""
        # 微信私钥：优先使用 WECHAT_PAY_PRIVATE_KEY（PEM 内容），否则用 WECHAT_PAY_PRIVATE_KEY_PATH（文件路径）
        wechat_private_key = os.getenv("WECHAT_PAY_PRIVATE_KEY", "").strip()
        if wechat_private_key and "\\n" in wechat_private_key:
            wechat_private_key = wechat_private_key.replace("\\n", "\n")
        config = cls(
            wechat=WeChatPayConfig(
                app_id=os.getenv("WECHAT_PAY_APP_ID", ""),
                mch_id=os.getenv("WECHAT_PAY_MCH_ID", ""),
                api_v3_key=os.getenv("WECHAT_PAY_API_V3_KEY", ""),
                private_key_path=os.getenv("WECHAT_PAY_PRIVATE_KEY_PATH", ""),
                private_key=wechat_private_key,
                cert_serial_no=os.getenv("WECHAT_PAY_CERT_SERIAL_NO", ""),
                notify_url=os.getenv("WECHAT_PAY_NOTIFY_URL", ""),
            ),
            alipay=AlipayConfig(
                app_id=os.getenv("ALIPAY_APP_ID", ""),
                private_key=os.getenv("ALIPAY_PRIVATE_KEY", ""),
                alipay_public_key=os.getenv("ALIPAY_PUBLIC_KEY", ""),
                notify_url=os.getenv("ALIPAY_NOTIFY_URL", ""),
                sign_type=os.getenv("ALIPAY_SIGN_TYPE", "RSA2"),
            ),
            alipay_under_development=os.getenv("ALIPAY_UNDER_DEVELOPMENT", "true").lower() in ("true", "1", "yes"),
        )

        # 日志输出配置状态
        if config.wechat.is_configured:
            logger.info(f"微信支付配置已加载: APP_ID={config.wechat.app_id}, MCH_ID={config.wechat.mch_id}")
        else:
            logger.warning("微信支付配置不完整，微信支付将不可用")

        if config.alipay.is_configured:
            logger.info(f"支付宝配置已加载: APP_ID={config.alipay.app_id}")
        else:
            logger.warning("支付宝配置不完整，支付宝支付将不可用")

        return config