"""Application configuration.

Twelve-factor: everything is read from the environment. Defaults are
development-friendly; production supplies real values via the compose `.env`.
No secrets or endpoints are hard-coded.
"""

from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

    app_name: str = "Provenance"
    version: str = "0.0.0"
    app_env: str = Field(default="development", description="development | production")

    # SQLAlchemy async URL, e.g. postgresql+asyncpg://user:pass@host:5432/db
    database_url: str = Field(
        default="postgresql+asyncpg://provenance:provenance@localhost:5432/provenance",
    )


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