from pathlib import Path
from typing import List, Union

from pydantic import AnyHttpUrl, field_validator
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    API_V1_STR: str = "/api/v1"
    PROJECT_NAME: str = "FastAPI REST API"
    
    # CORS middleware configuration
    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []

    @field_validator("BACKEND_CORS_ORIGINS", mode="before")
    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)

    # SQLite database configuration
    DB_DIR: Path = Path("/app/storage/db")
    
    class Config:
        case_sensitive = True
        env_file = ".env"


settings = Settings()