import os
from pathlib import Path

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """
    Application settings class that loads configuration from environment variables.
    """
    # API details
    API_V1_STR: str = "/api/v1"
    PROJECT_NAME: str = "Small Business Inventory Management System"
    PROJECT_DESCRIPTION: str = "API for managing inventory in small businesses"
    PROJECT_VERSION: str = "0.1.0"

    # Security
    SECRET_KEY: str = os.getenv("SECRET_KEY", "super-secret-key-for-development-only")
    ACCESS_TOKEN_EXPIRE_MINUTES: int = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "60"))
    ALGORITHM: str = "HS256"

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

    class Config:
        case_sensitive = True


settings = Settings()