"""Environment configuration derived from environment variables."""

from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings."""

    service_name: str = "backend"
    environment: str = "development"
    database_url: str = (
        "postgresql+psycopg://postgres:postgres@postgres:5432/avaaz"
    )

    model_config = SettingsConfigDict(env_prefix="", case_sensitive=False)


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    """Return cached settings instance."""
    return Settings()