import os
from pathlib import Path


APP_ENV = os.getenv("APP_ENV", "dev")
ROOT_DIR = Path(__file__).resolve().parents[3]
ENV_FILE = ROOT_DIR / f".env.{APP_ENV}"


def _load_env_file(path: Path) -> None:
    if not path.exists():
        return
    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        key = key.strip()
        if not key or key in os.environ:
            continue
        os.environ[key] = value.strip().strip("\"'")


_load_env_file(ENV_FILE)


def _required_env(name: str) -> str:
    value = os.getenv(name)
    if not value:
        raise RuntimeError(f"缺少 e签宝环境变量: {name}")
    return value


class Config:
    def __init__(self):
        self.appId = _required_env("ESIGN_APP_ID")
        self.scert = _required_env("ESIGN_APP_SECRET")
        self.host = _required_env("ESIGN_HOST").rstrip("/")
        self.ordid = _required_env("ESIGN_ORG_ID")
        self.templates_map = {
            "store_agreement": _required_env("ESIGN_TEMPLATE_STORE_AGREEMENT"),
            "lawyer_agreement": _required_env("ESIGN_TEMPLATE_LAWYER_AGREEMENT"),
            "alipay_auth": _required_env("ESIGN_TEMPLATE_ALIPAY_AUTH"),
            "wechat_pay_commitment": _required_env("ESIGN_TEMPLATE_WECHAT_PAY_COMMITMENT"),
        }
        self.templates_id = self.templates_map["store_agreement"]
        self.template_file_names = {
            "store_agreement": _required_env("ESIGN_TEMPLATE_FILE_STORE_AGREEMENT"),
            "lawyer_agreement": _required_env("ESIGN_TEMPLATE_FILE_LAWYER_AGREEMENT"),
            "alipay_auth": _required_env("ESIGN_TEMPLATE_FILE_ALIPAY_AUTH"),
            "wechat_pay_commitment": _required_env("ESIGN_TEMPLATE_FILE_WECHAT_PAY_COMMITMENT"),
        }
        self.callback_url = _required_env("ESIGN_CALLBACK_URL")
        self.developer_callback_url = os.getenv("ESIGN_DEVELOPER_CALLBACK_URL", self.callback_url)
        self.redirect_url = os.getenv("ESIGN_REDIRECT_URL", "https://www.esign.cn/")