"""# Summary

App configuration loaded from environment — a Settings dataclass with defaults
plus a singleton settings instance populated from OS environment variables at
import time.
"""
import os
from dataclasses import dataclass


@dataclass
class Settings:
    """Runtime configuration settings for the application.

    Attributes:
        debug (bool): Enable debug behavior. Defaults to False.
        mongo_uri (str): MongoDB connection URI. Defaults to mongodb://localhost:27017.
        mongo_db (str): MongoDB database name. Defaults to app_template.
        worker_poll_seconds (int): Worker poll interval in seconds. Defaults to 30.
        worker_max_retries (int): Maximum job retries before skipping. Defaults to 3.
    """

    debug: bool = False
    mongo_uri: str = "mongodb://localhost:27017"
    mongo_db: str = "app_template"
    worker_poll_seconds: int = 30
    worker_max_retries: int = 3


settings = Settings(
    debug=os.environ.get("DEBUG", "").lower() in ("1", "true", "yes"),
    mongo_uri=os.environ.get("MONGO_URI", "mongodb://localhost:27017"),
    mongo_db=os.environ.get("MONGO_DB", "app_template"),
    worker_poll_seconds=int(os.environ.get("WORKER_POLL_SECONDS", "30")),
    worker_max_retries=int(os.environ.get("WORKER_MAX_RETRIES", "3")),
)