"""Console runtime settings, all from environment variables (12-factor: the
Docker compose file sets them; tests pass a dict)."""
from __future__ import annotations

import os
from collections.abc import Mapping
from dataclasses import dataclass
from pathlib import Path

from je_validation.ingest.snapshots import latest_snapshot


@dataclass(frozen=True)
class ConsoleSettings:
    data_dir: Path
    snapshot_dir: Path
    openrouter_api_key: str
    openrouter_base_url: str
    max_concurrent_episodes: int
    allow_unlimited_tokens: bool
    port: int
    space_host: str

    @classmethod
    def from_env(cls, env: Mapping[str, str] | None = None) -> ConsoleSettings:
        e = os.environ if env is None else env
        data_dir = Path(e.get("JE_DATA_DIR", "data")).resolve()
        snap = e.get("JE_SNAPSHOT_DIR", "")
        snapshot_dir = (Path(snap) if snap
                        else latest_snapshot(data_dir / "snapshots" / "ds_a"))
        return cls(
            data_dir=data_dir,
            snapshot_dir=snapshot_dir,
            openrouter_api_key=e.get("OPENROUTER_API_KEY", ""),
            openrouter_base_url=e.get("JE_OPENROUTER_BASE_URL",
                                      "https://openrouter.ai/api/v1"),
            max_concurrent_episodes=int(e.get("JE_MAX_CONCURRENT_EPISODES", "5")),
            allow_unlimited_tokens=e.get("JE_ALLOW_UNLIMITED_TOKENS", "") == "1",
            port=int(e.get("JE_PORT", "8000")),
            # Set by Hugging Face Spaces: the public hostname the browser hits.
            space_host=e.get("SPACE_HOST", ""),
        )