from __future__ import annotations

import os
from dataclasses import dataclass, field
from pathlib import Path


@dataclass(frozen=True)
class Settings:
    app_name: str = "smart-deploy-agent-demo"
    app_env: str = field(default_factory=lambda: os.getenv("APP_ENV", "demo"))
    app_port: int = field(default_factory=lambda: int(os.getenv("APP_PORT", "8000")))
    default_timezone: str = field(default_factory=lambda: os.getenv("DEFAULT_TIMEZONE", "Asia/Shanghai"))
    database_url: str = field(default_factory=lambda: os.getenv("DATABASE_URL", "sqlite:///./data/agent_demo.db"))
    enable_sample_app_bridge: bool = field(
        default_factory=lambda: os.getenv("ENABLE_SAMPLE_APP_BRIDGE", "false").lower() in {"1", "true", "yes", "on"}
    )
    sample_app_root: str = field(default_factory=lambda: os.getenv("SAMPLE_APP_ROOT", "sample-apps/order-service"))


def get_settings() -> Settings:
    return Settings()


def ensure_runtime_directories() -> None:
    Path("data").mkdir(parents=True, exist_ok=True)