from typing import List, Union
from pathlib import Path
from pydantic import AnyHttpUrl, validator
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    API_V1_STR: str = "/api/v1"
    PROJECT_NAME: str = "User Authentication Service"
    PROJECT_DESCRIPTION: str = "API service for user authentication"
    PROJECT_VERSION: str = "0.1.0"

    # Secret key for JWT token and other security mechanisms
    SECRET_KEY: str = "YOUR_SUPER_SECRET_KEY_CHANGE_THIS_IN_PRODUCTION"
    # 60 minutes * 24 hours * 8 days = 8 days in minutes
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8

    # CORS
    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []

    @validator("BACKEND_CORS_ORIGINS", pre=True)
    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
        if isinstance(v, str) and not v.startswith("["):
            return [i.strip() for i in v.split(",")]
        elif isinstance(v, (list, str)):
            return v
        raise ValueError(v)

    # Database
    DB_DIR: Path = Path("/app/storage/db")
    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"

    # Token related
    TOKEN_URL: str = f"{API_V1_STR}/auth/login"

    class Config:
        case_sensitive = True
        env_file = ".env"


# Create the DB directory if it doesn't exist
Settings().DB_DIR.mkdir(parents=True, exist_ok=True)

settings = Settings()