import os
from typing import ClassVar # <--- 1. 导入这个
from pydantic_settings import BaseSettings, SettingsConfigDict

class Settings(BaseSettings):
    DB_USER: str
    DB_PASS: str
    DB_HOST: str
    DB_PORT: str = "5432"
    DB_NAME: str
    DASHSCOPE_API_KEY: str
    FIRECRAWL_API_KEY: str
    
    CANDIDATE_NUM: int = 50 

    # =========================================================
    # 【核心修复】加上 ClassVar 类型注解
    # =========================================================
    BASE_DIR: ClassVar[str] = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
    ENV_PATH: ClassVar[str] = os.path.join(BASE_DIR, ".env")

    # 使用绝对路径加载
    model_config = SettingsConfigDict(env_file=ENV_PATH, extra="ignore")

    @property
    def DATABASE_URL(self) -> str:
        return f"postgresql+psycopg2://{self.DB_USER}:{self.DB_PASS}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"

settings = Settings()