"""Application configuration loaded from environment variables.

All settings are read from environment variables prefixed with
``ARTIFACTSTORE_``. A ``.env`` file at the repository root is honoured for
local development; see ``.env.example``.
"""

from __future__ import annotations

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Top-level service configuration."""

    model_config = SettingsConfigDict(
        env_prefix="ARTIFACTSTORE_",
        env_file=".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

    database_url: str = "sqlite+aiosqlite:///./var/artifactstore.db"
    storage_local_root: str = "./var/storage"
    log_level: str = "INFO"
    auth_tokens: str = ""
    anon_read: bool = False
    api_url: str = "http://127.0.0.1:8000"
    api_token: str = ""
    retention_config_path: str = ""
    retention_sweep_interval_seconds: int = 3600

    @property
    def bearer_tokens(self) -> frozenset[str]:
        """Configured shared-secret bearer tokens, parsed from CSV / newline text."""
        return frozenset(
            token.strip()
            for token in self.auth_tokens.replace("\n", ",").split(",")
            if token.strip()
        )


def get_settings() -> Settings:
    """Return a freshly-loaded :class:`Settings` instance."""
    return Settings()