// Shared config + session storage for the agent sidecar.
//
// The session file holds the agent's device token and its ECDH private key — it
// IS the agent's identity, and (like the ANTHROPIC_API_KEY) it lives only on the
// agent host, never on the lchat server. Keep it secret; back it up.
import { readFileSync, writeFileSync, existsSync } from "node:fs";
import { fileURLToPath } from "node:url";

// The instance base URL, e.g. https://test.example.com. WS base is derived
// (https -> wss, http -> ws).
export const BASE = (process.env.LCHAT_BASE || "").replace(/\/$/, "");
export const WS_BASE = BASE.replace(/^http/, "ws");

// Whether the model brain is available. With no key the sidecar still runs its
// deterministic side (welcomes + slash commands), so a helper "upgrades" from
// BOT to AI exactly when a key is present — the badge follows this (runtime.mjs
// self-declares kind), and non-command messages degrade to a commands hint.
export const AI_ENABLED = !!(process.env.ANTHROPIC_API_KEY || "").trim();

export const AGENT_NAME = process.env.LCHAT_AGENT_NAME || "Claude";
// The app's user-facing name (the product is called Eleven; lchat is the
// project/repo name). Bots refer to the app by this.
export const APP_NAME = process.env.LCHAT_APP_NAME || "Eleven";
export const MODEL = process.env.LCHAT_MODEL || "claude-sonnet-5";
// The bare-name "am I being addressed?" gate in runtime.mjs — a tiny yes/no
// call, so it always uses the cheapest model regardless of the bot's MODEL.
export const CLASSIFIER_MODEL = process.env.LCHAT_CLASSIFIER_MODEL || "claude-haiku-4-5";

// Session lives next to this module by default so `node agent.mjs` works from
// any cwd; override with LCHAT_SESSION.
export const SESSION_PATH =
  process.env.LCHAT_SESSION || fileURLToPath(new URL("./session.json", import.meta.url));

export function requireBase() {
  if (!BASE) {
    console.error("Set LCHAT_BASE to your instance URL, e.g. https://test.example.com");
    process.exit(1);
  }
}

export function loadSession() {
  return existsSync(SESSION_PATH) ? JSON.parse(readFileSync(SESSION_PATH, "utf8")) : null;
}

export function saveSession(s) {
  writeFileSync(SESSION_PATH, JSON.stringify(s, null, 2));
}