"""Server configuration, read from environment variables."""

from __future__ import annotations

import os
from dataclasses import dataclass


def _float(name: str, default: float) -> float:
    return float(os.environ.get(name, default))


def _int(name: str, default: int) -> int:
    return int(os.environ.get(name, default))


@dataclass(frozen=True)
class Settings:
    # Shared secret the AI service has to present on /internal/ai.
    # Empty disables authentication (development only).
    ai_shared_secret: str = os.environ.get("AI_SHARED_SECRET", "")
    # Seconds to wait for the AI service before falling back to a random move.
    ai_decision_timeout: float = _float("AI_DECISION_TIMEOUT", 5.0)
    # Minimum "thinking" time of AI players so humans can follow the game.
    ai_move_delay: float = _float("AI_MOVE_DELAY", 0.8)
    # Pause after a completed trick before AI players continue.
    trick_pause: float = _float("TRICK_PAUSE", 1.8)
    # Sessions without a connection are dropped after this many seconds.
    session_ttl: float = _float("SESSION_TTL", 1800.0)
    # Maximum number of simultaneously existing lobbies.
    max_lobbies: int = _int("MAX_LOBBIES", 1000)
    # Comma separated list of allowed websocket origins; empty allows all.
    allowed_origins: tuple[str, ...] = tuple(
        origin.strip() for origin in os.environ.get("ALLOWED_ORIGINS", "").split(",") if origin.strip()
    )
    log_level: str = os.environ.get("LOG_LEVEL", "INFO")


settings = Settings()