"""全局配置。

用 pydantic-settings 从环境变量 + .env 文件加载。所有可调参数集中在这里,
业务代码通过 `from app.core.config import settings` 引用,不再读 os.environ。
"""
from __future__ import annotations

from functools import lru_cache
from pathlib import Path
from typing import Literal

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict

_PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=str(_PROJECT_ROOT / ".env"),
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )

    # ===== 环境 =====
    APP_ENV: Literal["dev", "prod"] = "dev"
    APP_NAME: str = "shaguabijia-app-server"
    APP_DEBUG: bool = True

    # ===== 数据库 =====
    DATABASE_URL: str = "sqlite:///./data/app.db"

    # ===== JWT =====
    JWT_SECRET_KEY: str = "change-me"
    JWT_ALGORITHM: str = "HS256"
    JWT_ACCESS_TOKEN_EXPIRE_MINUTES: int = 120
    JWT_REFRESH_TOKEN_EXPIRE_DAYS: int = 30

    # ===== 极光 =====
    JG_APP_KEY: str = ""
    JG_MASTER_SECRET: str = ""
    JG_PRIVATE_KEY_PATH: str = "./secrets/jverify_rsa_private.pem"
    JG_VERIFY_ENDPOINT: str = "https://api.verification.jpush.cn/v1/web/loginTokenVerify"
    JG_REQUEST_TIMEOUT_SEC: int = 15

    # ===== 短信 =====
    SMS_MOCK: bool = True
    SMS_CODE_TTL_SEC: int = 300
    SMS_SEND_INTERVAL_SEC: int = 60

    # ===== 美团联盟 CPS =====
    MT_CPS_APP_KEY: str = ""
    MT_CPS_APP_SECRET: str = ""
    MT_CPS_HOST: str = "https://media.meituan.com"
    MT_CPS_TIMEOUT_SEC: int = 15
    MT_CPS_DEFAULT_SID: str = "sgbjia"

    # ===== Pricebot 上游 (领券业务透传目标) =====
    # pricebot-backend 默认跑在 8000。/api/v1/coupon/step 会透传到这里的 /api/coupon/step
    PRICEBOT_BASE_URL: str = "http://localhost:8000"
    # 领券一帧最多 wait 6s,加网络往返,timeout 给 30s 比较稳
    PRICEBOT_REQUEST_TIMEOUT_SEC: int = 30

    # ===== CORS =====
    CORS_ALLOW_ORIGINS: str = ""

    @property
    def cors_origins_list(self) -> list[str]:
        if not self.CORS_ALLOW_ORIGINS.strip():
            return []
        return [o.strip() for o in self.CORS_ALLOW_ORIGINS.split(",") if o.strip()]

    @property
    def is_prod(self) -> bool:
        return self.APP_ENV == "prod"


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()


settings = get_settings()