openai-compat-endpoint

import fs from "node:fs";
import os from "node:os";
import path from "node:path";

const cacheDir = path.join(os.homedir(), ".lmstudio", "openai-compat-endpoint");
const cachePath = path.join(cacheDir, "models-cache.json");

type ModelCache = {
  models?: string[];
  lastSelected?: string;
};

export function readCachedState(): { models: string[]; lastSelected?: string } {
  try {
    const raw = fs.readFileSync(cachePath, "utf8");
    const parsed = JSON.parse(raw) as ModelCache;
    const models = Array.isArray(parsed?.models)
      ? parsed.models.filter((id): id is string => typeof id === "string" && id.length > 0)
      : [];
    const lastSelected =
      typeof parsed?.lastSelected === "string" && parsed.lastSelected.length > 0
        ? parsed.lastSelected
        : undefined;
    return { models, lastSelected };
  } catch {
    return { models: [] };
  }
}

export async function writeCachedState(
  models: string[],
  lastSelected?: string,
): Promise<void> {
  await fs.promises.mkdir(cacheDir, { recursive: true });
  const payload: ModelCache = { models, lastSelected };
  await fs.promises.writeFile(cachePath, JSON.stringify(payload, null, 2), "utf8");
}