import os
from pathlib import Path
from typing import Optional

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    # API Information
    PROJECT_NAME: str = "Task Manager API"
    DESCRIPTION: str = "A FastAPI-based task management system"
    VERSION: str = "0.1.0"
    API_V1_STR: str = "/api/v1"

    # Authentication settings
    SECRET_KEY: str = os.environ.get(
        "SECRET_KEY", "your-super-secret-key-for-development-only"
    )
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30

    # Database settings
    DB_DIR: Path = Path("/app") / "storage" / "db"
    SQLALCHEMY_DATABASE_URL: Optional[str] = None

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = True


settings = Settings()

# Ensure database directory exists
settings.DB_DIR.mkdir(parents=True, exist_ok=True)

# Set database URL after ensuring directory exists
if settings.SQLALCHEMY_DATABASE_URL is None:
    settings.SQLALCHEMY_DATABASE_URL = f"sqlite:///{settings.DB_DIR}/db.sqlite"