from functools import lru_cache
from pathlib import Path

from dotenv import load_dotenv
from pydantic_settings import BaseSettings, SettingsConfigDict

# .env 在仓库根（server/ 的上一级），供各部分共用
_ROOT_DIR = Path(__file__).resolve().parents[2]
load_dotenv(_ROOT_DIR / ".env")


class Settings(BaseSettings):
    """运行时与密钥。模型清单见 config/models.yaml。"""

    model_config = SettingsConfigDict(
        env_file=str(_ROOT_DIR / ".env"),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    # ── AI 密钥 ──
    deepseek_api_key: str = ""
    openai_api_key: str = ""
    dashscope_api_key: str = ""
    # 华北2（北京）业务空间时需填：https://{WorkspaceId}.cn-beijing.maas.aliyuncs.com/api/v1
    dashscope_base_http_api_url: str = ""

    # ── 运行 ──
    host: str = "127.0.0.1"
    port: int = 8800
    cors_origins: str = ""

    # ── V2：数据层 ──
    # 本地过渡用 SQLite；上线切 PostgreSQL：postgresql+asyncpg://user:pass@host:5432/ozon_seller
    database_url: str = "sqlite+aiosqlite:///./data/app.db"

    # ── V2：鉴权 ──
    app_token: str = ""          # MVP 单用户登录 token（换发 JWT 用）
    secret_key: str = ""         # 店铺凭证 AES-GCM 加密密钥 + JWT 签名密钥
    jwt_expire_minutes: int = 60 * 24 * 7  # JWT 有效期（默认 7 天）

    # ── V2：七牛（图片存储）──
    qiniu_access_key: str = ""
    qiniu_secret_key: str = ""
    qiniu_bucket: str = ""
    qiniu_domain: str = ""       # 绑定域名，如 https://cdn.example.com
    # 为空时用本地文件系统兜底（开发期），不为空时走七牛
    storage_backend: str = "local"  # local | qiniu

    # ── V2：对外地址（插件/前端回写、生成图回调）──
    app_base_url: str = "http://127.0.0.1:8800"

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

    @property
    def use_qiniu(self) -> bool:
        return self.storage_backend == "qiniu" and bool(
            self.qiniu_access_key and self.qiniu_secret_key and self.qiniu_bucket
        )


@lru_cache
def get_settings() -> Settings:
    return Settings()