from __future__ import annotations

import logging
import os

logger = logging.getLogger(__name__)

WECHATPAY_NOTIFY_CONFIG_SCHEMA = {
    "$schema": "https://json-schema.org/draft-07/schema#",
    "type": "object",
    "title": "微信支付通知配置",
    "properties": {
        "enabled": {"type": "boolean", "default": True, "title": "启用"},
        "mch_id": {"type": "string", "title": "微信商户号 (mchid)"},
        "mch_name": {"type": "string", "title": "商户名称"},
        "api_v3_key": {
            "type": "string",
            "title": "APIv3 密钥 (32字节hex)",
            "x-ui-password": True,
        },
        "serial_no": {"type": "string", "title": "商户API证书序列号"},
        "private_key_path": {
            "type": "string",
            "title": "商户私钥文件路径",
            "description": "apiclient_key.pem 的绝对路径",
        },
        "app_id": {"type": "string", "title": "关联 AppID"},
        "cert_mode": {
            "type": "string",
            "title": "验签模式",
            "enum": ["platform_cert", "public_key"],
            "default": "platform_cert",
        },
        "public_key_pem": {
            "type": "string",
            "title": "微信支付公钥 (PEM)",
            "description": "公钥模式下必填，商户平台下载的公钥文件内容",
        },
        "public_key_id": {
            "type": "string",
            "title": "公钥ID",
            "description": "公钥模式下必填，PUB_KEY_ID_ 开头的ID",
        },
        "accounts": {
            "type": "object",
            "title": "多商户配置",
            "additionalProperties": {
                "type": "object",
                "properties": {
                    "mch_id": {"type": "string", "title": "微信商户号"},
                    "mch_name": {"type": "string", "title": "商户名称"},
                    "api_v3_key": {"type": "string", "title": "APIv3密钥", "x-ui-password": True},
                    "serial_no": {"type": "string", "title": "证书序列号"},
                    "private_key_path": {"type": "string", "title": "私钥路径"},
                    "app_id": {"type": "string", "title": "关联 AppID"},
                    "cert_mode": {
                        "type": "string",
                        "title": "验签模式",
                        "enum": ["platform_cert", "public_key"],
                        "default": "platform_cert",
                    },
                    "public_key_pem": {"type": "string", "title": "微信支付公钥 (PEM)"},
                    "public_key_id": {"type": "string", "title": "公钥ID"},
                },
            },
        },
    },
}


class WechatPayConfigAdapter:
    def __init__(self):
        self._config: dict = {}

    def list_account_ids(self, config: dict) -> list[str]:
        self._config = config
        wp_cfg = self._get_wechatpay_config()
        accounts = wp_cfg.get("accounts", {}) if isinstance(wp_cfg, dict) else {}
        if accounts:
            return list(accounts.keys())
        return ["default"]

    async def resolve_account(self, account_id: str) -> dict:
        wp_cfg = self._get_wechatpay_config()

        if account_id == "default" or account_id not in wp_cfg.get("accounts", {}):
            raw = wp_cfg if isinstance(wp_cfg, dict) else {}
        else:
            raw = wp_cfg.get("accounts", {}).get(account_id, {})

        private_key = self._load_private_key(
            account_id,
            raw.get("private_key_path", ""),
        )

        return {
            "account_id": account_id,
            "mch_id": raw.get("mch_id", ""),
            "mch_name": raw.get("mch_name", account_id),
            "api_v3_key": raw.get("api_v3_key", ""),
            "serial_no": raw.get("serial_no", ""),
            "private_key_pem": private_key,
            "app_id": raw.get("app_id", ""),
            "enabled": raw.get("enabled", True),
            "cert_mode": raw.get("cert_mode", "platform_cert"),
            "public_key_pem": raw.get("public_key_pem", ""),
            "public_key_id": raw.get("public_key_id", ""),
        }

    def is_configured(self, account: dict) -> bool:
        return bool(
            account.get("mch_id")
            and account.get("api_v3_key")
            and account.get("serial_no")
            and account.get("private_key_pem")
        )

    def is_enabled(self, account: dict) -> bool:
        return account.get("enabled", True) and self.is_configured(account)

    def disabled_reason(self, account: dict) -> str:
        missing = []
        if not account.get("mch_id"):
            missing.append("商户号 (mch_id)")
        if not account.get("api_v3_key"):
            missing.append("APIv3 密钥")
        if not account.get("serial_no"):
            missing.append("证书序列号")
        if not account.get("private_key_pem"):
            missing.append("商户私钥")
        if account.get("cert_mode") == "public_key":
            if not account.get("public_key_pem"):
                missing.append("微信支付公钥 (public_key_pem)")
            if not account.get("public_key_id"):
                missing.append("公钥ID (public_key_id)")
        if missing:
            return f"缺少配置: {', '.join(missing)}"
        return ""

    def describe_account(self, account: dict) -> dict:
        return {
            "account_id": account.get("account_id", ""),
            "mch_id": account.get("mch_id", ""),
            "mch_name": account.get("mch_name", ""),
            "configured": self.is_configured(account),
        }

    def config_schema(self) -> dict:
        return WECHATPAY_NOTIFY_CONFIG_SCHEMA

    def _get_wechatpay_config(self) -> dict:
        channels = self._config.get("channels", {}) if isinstance(self._config, dict) else {}
        return channels.get("wechatpay_notify", {}) if isinstance(channels, dict) else {}

    @staticmethod
    def _load_private_key(account_id: str, file_path: str) -> str:
        env_key = os.environ.get(f"WECHATPAY_PRIVATE_KEY_{account_id.upper()}", "")
        if env_key:
            return env_key

        if file_path and os.path.exists(file_path):
            try:
                with open(file_path, encoding="utf-8") as f:
                    return f.read()
            except Exception:
                logger.exception("Failed to read private key: %s", file_path)

        env_key_default = os.environ.get("WECHATPAY_PRIVATE_KEY", "")
        return env_key_default