from functools import lru_cache
from pathlib import Path

from dotenv import load_dotenv
from pydantic_settings import BaseSettings, SettingsConfigDict

_ROOT_DIR = Path(__file__).resolve().parents[1]
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",
    )

    deepseek_api_key: str = ""
    openai_api_key: str = ""
    host: str = "127.0.0.1"
    port: int = 8000
    cors_origins: str = ""

    @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()]


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